Signs Your Filter Press May Need Service

Does My Filter Press Need Service?

The filter press is a complex piece of machinery, and even with the proper maintenance, it’s still likely that your press will eventually need service. Ensuring your filter press receives the service it needs is essential in maximizing its life and streamlining your operation’s filtration efficiency. Not certain if your press needs service? Read on to learn more.

Does my filter press need service? Filter press field service; filter press maintenance; filter press repair

My filter press is leaking oil.

Oil leaks usually require immediate attention, and you may need service if you’re dealing with one. Try to examine the press to pinpoint the source of the leak. Sometimes, that source will be a damaged cylinder. These can be rebuilt or replaced, and these tasks are likely best left to an expert. The source could also simply be a loose fitting, which you can likely tighten on your own.

The filter cake is wet and slimy, even with new filter cloths.

This is one issue that can take a serious toll on your business’s productivity. You may be able to examine your filtration process to determine adjustments that may assist with the issue, but a trained filter press repair technician can typically provide valuable insight, helping to prevent similar issues from occurring in the future.

Filter press components are failing early.

Component failure is never a good sign, but the fix could be as simple as an oil change. Fortunately, changing your filter press oil is something you can probably do on your own. Not seeing any improvements after you’ve changed your oil? It’s likely time to reach out to a filter press professional.

The press isn’t properly regulating hydraulic pressure.

Here, you may be dealing with several issues. Start by trying to reset your relief pressure. If that doesn’t fix the problem, your relief valve may need to be replaced, so it’s worth calling a technician.

If pressure issues are accompanied by an oil leak, you may be able to perform the fix yourself by seeking out the source of the leak and tightening the fitting, as we mentioned earlier.

Should you get preventative service, even when nothing’s wrong?

Contacting a filter press technician even when there’s no specific issue isn’t a bad idea. In fact, regular preventative maintenance can work wonders in making the most of your filter press throughout its lifespan.

Need onsite support for your filter press troubles? M.W. Watermark™ offers TWIC-certified filtration equipment experts who are fully equipped to visit your business, address filter press trouble and train employees on proper press usage.

Contact us today to learn more.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Filter Cloths 101: Common Weave Patterns

The most common filter cloth weave patterns are plain, twill, and satin.

In addition to selection of filter cloth materials, weave patterns can be a critical factor affecting filter cloth performance. Weave patterns are recommended based on the nature of the slurry being dewatered, and can affect a cloth’s strength, resistance to acid and alkaline environments, ease of cake release and resistance to blinding.

 

M.W. Watermark™ Manufactures Filter Press Cloths with Weave Patterns to Suit the Requirements of Your Particular Application
M.W. Watermark™ Manufactures Filter Press Cloths with Weave Patterns to Suit the Requirements of Your Particular Application

What is meant by Warp and Weft?

Warp is the threads that run lengthwise in a cloth. Weft is the threads that run across the width of a cloth at right angles to the warp. These are also known as filling threads. Warp should run vertically when installed.

Common Filter Cloth Weave Patterns

Plain Weave

Plain Weave (or Checkerboard Weave) is the most basic weave, with a weft thread alternately going over one warp thread and then under one warp thread. Average in strength, cake release, and stability. High particle retention and low resistance to blinding.

 

M.W. Watermark Filter Cloths - Plain Weave Pattern

M.W. Watermark Filter Cloths - Plain Weave Pattern

Twill Weave

Twill Weave adds a diagonal rib or “twill” line into the weave, adding strength at the expense of some stability. These diagonals are caused by moving the yarn intersection one weft thread higher on successive warp yarns. Cake release is average. Average resistance to blinding.

 

M.W. Watermark Filter Cloths - Twill Weave Pattern

M.W. Watermark Filter Cloths - Twill Weave Pattern

 

Satin Weave

Satin Weave (or Sateen Weave) has a smooth surface caused by carrying the warp yarn on the fabric surface over many weft yarns. Intersections between warp and weft are kept to a minimum. Very flexible, easily conforms to most curved surfaces. Satin weave is popular for its excellent cake release and resistance to blinding. Particle retention is average.

 

M.W. Watermark Filter Cloths - Satin Weave Pattern

M.W. Watermark Filter Cloths - Satin Weave Pattern

Additional Weave Patterns

Leno Weave

The leno weave involves two or more warp threads crossing over each other and interlacing with one or more filling threads. This is known as a “locking” weave, as it is mainly used to prevent the shifting of fibers in open weave fabrics. This type of weave is usually only found in backing cloths.

Basket Weave

Basket weave is a variation of the plain weave. Two or more warp yarns alternately cross with two or more filling yarns. Stronger than a plain weave, at the expense of stability. Typically used for backing cloth or basic applications requiring additional strength.

 

M.W. Watermark™ Manufactures Filter Press Cloths with Weave Patterns to Suit the Requirements of Your Particular Application

Contact Us Today

Contact our Sales and Service Team today to discuss your particular dewatering application.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Plate and Frame Filter Press vs. Recessed Chamber Filter Press

Plate and Frame

What is a Plate and Frame Filter Press?

Plate and frame filter presses have been used for many years, and predate the recessed chamber filter press, which is the type that most people think of today when they hear the term filter press. Although recessed chamber presses are now more of the norm, the plate and frame design has some advantages with certain applications and is still used today.

M.W. Watermark - What is a plate and frame filter press and how does it work?

Plate and Frame Filter Press Design Overview

The plate and frame design utilizes a flat, solid plate (known as a “flush plate”) covered by a filter press cloth, with a hollow frame between each plate. A metal skeleton holds and clamps the filter plates together to create a chamber, which is formed by the flush plate on each side of a frame. Filter cake is collected within the frame. Historically, plates were made of wood or cast iron. Today, the most common material is polypropylene.

M.W. Watermark Plate and Frame Filter Press
M.W. Watermark Plate and Frame Filter Press

How Does a Plate and Frame Filter Press Work?

The slurry is pumped into a corner hole and flows into each frame, allowing solid particles to accumulate on the filter cloths. The remaining filtered liquid (also known as filtrate) then moves to a drainage port in the flush plate and into a corner hole that is not being used for feeding the slurry. The filtrate then travels to discharge piping and is directed to the next step in the process.

After a period of time, the frames become filled with solids, the slurry feed pump turns off, and the filter press is ready to open. Each frame should now contain a filter cake, which is the end result of the solids forming on the filter cloths. The filter cakes are then scraped out of the frames using a spatula, ideally falling into a cake hopper placed below the press.

M.W. Watermark - What is a plate and frame filter press and how does it work? Plate and frame filter press operation; Plate and frame filtration process M.W. Watermark - What is a plate and frame filter press and how does it work? Plate and frame filter press working.; Plate and frame filter press operation; Plate and frame filtration process

Advantages of the Plate and Frame Design

The primary advantages of plate and frame presses are the ability to quickly change the filter cloths as well as the ability to use a wider range of materials for the filtration medium, including paper, which is often used for fine filtration applications.

For example, in a process where immediate particle retention is important, filter paper may be required as fine solids would either blind off the filter cloth or simply pass through it. Note that filter cloths are still in place to support the filter paper. The filter cloths are reused, but the filter paper is replaced after every filtration cycle.

Plate and frame presses are best suited for projects where filtration area is more important than volume. This is why plates and frames have their greatest prominence in polishing applications (as opposed to dewatering projects), where the feed solids concentration is often well below 1% by weight.

Polishing applications are sized for a particular filtration area based on the process flow rate and the known flux rate (volume per area per unit of time). To avoid dips in achievable filtration flow as the press fills with solids, polishing applications usually include a redundant filter press that is also sized to accept 100% of the desired process flow.

M.W. Watermark Plate and Frame Filter Press Design

Disadvantages of Plate and Frame Presses

One disadvantage of the plate and frame design is the potential for building uneven pressure between frames, which can lead to plate damage. This issue stems from the fact that the frame is being fed through a small opening in the corner, which can lead to blockage. This clogging can cause one frame to become full while the next frame in-line remains empty.

Another disadvantage is the potential for leakage. The filter plates used in plate and frame presses are non-gasketed, which allows them to wick liquid under pressure. This type of filter press is usually mounted on a raised platform or positioned over a pit where any leaked liquids can be collected more conveniently.

Recessed Chamber

What is a Recessed Chamber Filter Press?

A recessed chamber filter press utilizes filter plates that form a series of cavities between them when they are clamped together. Suspended particulates collect on the filter cloths and build up inside each cavity space to form a filter cake. Compare this to the hollow frames of the plate and frame design where solids are collected.

M.W. Watermark 800mm Filter Press

M.W. Watermark Gasketed Polypropylene Recessed Chamber Filter Plates in a Press with Cloths Installed. Solids Accumulate on the Surface of the Cloths to Form a Filter Cake.
M.W. Watermark Gasketed Polypropylene Recessed Chamber Filter Plates in a Press with Cloths Installed. Solids Accumulate on the Surface of the Cloths to Form a Filter Cake.

Recessed Chamber Filter Press Design Overview

The skeleton of a recessed chamber filter press is constructed in a similar fashion as a plate and frame press where the plates hang on a steel frame, and the frame acts as a clamping device for the filter plates. Both types of presses also utilize a hydraulic cylinder and pump for opening, closing, and clamping the press.

As with plate and frame filter plates, recessed chamber plates are most commonly made from polypropylene. However, recessed chamber plates can be either gasketed or non-gasketed. Gasketed plates offer greater protection from leakage, but can also require a more time-intensive cloth changing process. Non-gasketed cloths or plate and frame cloths can have latex applied to the edges to help minimize (but not eliminate) wicking.

M.W. Watermark - What is a Recessed Chamber Plate Filter Press

How Does a Recessed Chamber Filter Press Work?

Slurry is pumped into the filter press through the feed (most commonly in the center of the plate) and the solids are distributed evenly in each chamber throughout the press (1). Solids begin to build on the filter cloths. Most of the solid/liquid separation is accomplished by the particulates building on the cloths. At first, some fines pass through, but eventually the solids begin to form a layer on the cloths (2). This layer traps the fine particles and eventually forms a filter cake. The filter cake then serves as a depth filter as the dewatering process continues.

The filtrate (liquid) usually exits the filter pack (plates) through corner ports into a manifold. When the correct valves in the manifold are open, the filtrate exits the press through a single point, the filtrate outlet. The filtrate is then directed via discharge piping to the next step in the process.

As the filter press builds pressure, the solids build within the chambers until they are completely full of filter cake (3). Once the chambers are full, the fill cycle is complete, and the filter press is ready to be emptied (4). The press is then opened, and the plates are moved apart. As the plates are shifted, the filter cake falls from each chamber into a cake hopper or drum below the press. A spatula can be used to scrape the cake from the cloths if needed.

M.W. Watermark - How Does a Recessed Chamber Plate Filter Press Work - Infographic
(Click Image to Enlarge)

Advantages of the Recessed Chamber Design

One of the main advantages of the recessed chamber plate design is the ability to feed a large center hole versus a small opening in the corner of the plate. The large hole in the center of the plates allows the chambers to fill faster and more evenly, with less risk of clogging and causing plate damage due to unequal pressure. This is especially important in applications with high feed solids.

However, it’s also important to note that a larger feed inlet (combined with gaining one more filtrate outlet in a center feed configuration) is important in large-scale polishing applications with high flux rates (for example, a Merrill-Crowe process). If the filter plate inlets, outlets, and internal porting are not large enough, the calculated press flow rate will not be achievable.

Another advantage is the ability to achieve higher feed pressure with the recessed chamber design. The “frame” or sealing surface of the recessed chamber plate is all connected to the center web. This keeps the “frame” from bowing out under high pressures.

Gasketed Recessed Chamber Filter Plate without a Filter Cloth Installed. Note How the "Frame" or Sealing Surface is Connected to the Center Web.
Gasketed Recessed Chamber Filter Plate without a Filter Cloth Installed. Note How the “Frame” or Sealing Surface is Connected to the Center Web.

Also, filter cake release is generally easier with a recessed plate. When the press is opened, and the plates are shifted, the cake either falls out or is quickly scraped off the cloths using a spatula. Cake release may not be as fast with a plate and frame press, as the filter cake is held by a non-tapered frame and may require more manipulation for removal.

M.W. Watermark - How Does a Recessed Chamber Plate Filter Press Work
Filter Cake Releasing from a Recessed Chamber Filter Plate

Disadvantages of Recessed Chamber Presses

Although recessed chamber presses have several advantages over plate and frame, one disadvantage is the limitation on cake thickness, which is dictated by the depth of the chamber. Recessed chamber plates cannot be easily swapped out for a wider or narrower frame as in a plate and frame press. This makes the plate and frame design better suited for applications where testing variations in filter cake thickness is important.

Another disadvantage can be seen in changing filter cloths. The plate and frame design allows for a simple drape-over cloth, whereas recessed chamber either requires pounding filter cloths into the plates (gasketed) or securing cloths to the plates using cloth dogs and zip ties or hook-and-loop fasteners (non-gasketed).

Contact Us Today

Contact our Sales and Service Team to learn more or request a quote today.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Benefits of Wastewater Staff Training and Other Field Services

There’s no denying that wastewater treatment equipment can be fairly complex, which makes it essential for equipment operators to know the ins and outs of every piece of machinery they’re required to use. This may require training for best results. Keep reading, and we’ll explain why you should consider professional field training services for your wastewater staff.

M.W. Watermark Filter Press Field Services Technician; Filter Press Repair; Field Training; Wastewater Staff Training
M.W. Watermark Field Services Technician, Brandon S.

Why Choose Staff Training from M.W. Watermark™?

M.W. Watermark’s time-tested professionals are fully equipped to train your staff on the use of your business’s wastewater treatment equipment. But what is it that makes M.W. Watermark’s training services worth the investment?

For one, our factory-trained, fully-insured service professionals have garnered significant hands-on experience with the types of equipment you’re likely using. Plus, as a further indicator of our team’s expertise, M.W. Watermark’s wastewater experts are TWIC-certified, a credential required by the Maritime Transportation Security Act that allows workers to access certain secured areas of the USA’s maritime vessels and related facilities.

One of the most notable benefits of field training is that it offers an opportunity for our wastewater professionals to provide advice regarding the efficiency of operating your equipment. While your team may be well-versed in operating equipment to your business’s current standards, our professionals may be able to identify areas for improvement – and once those changes are made, we’ll train your staff on operating your wastewater treatment equipment accordingly.

M.W. Watermark Engineer and Field Services Technician, Dave H.; Filter Press Repair; Field Training; Wastewater Staff Training
M.W. Watermark Engineer and Field Services Technician, Dave H.

Other M.W. Watermark Field Services

Aside from staff training, M.W. Watermark™ offers a range of competitively priced field services designed to help your facility maximize its efficiency. These services include:

  • Start-up Assistance
  • Installation
  • Mechanical Repairs
  • PLC Programming
  • Process Reviews
  • And More

If you feel your business would benefit from the professional assistance of M.W. Watermark’s team of wastewater treatment equipment professionals, contact us today.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Filter Cloths 101: Common Fabric Types

The Importance of Selecting the Appropriate Fabric Type for a Given Application

M.W. Watermark Filter Press Cloth Manufacturer; Filter cloth for filter press

Filter press cloths can be manufactured from many types of materials including polypropylene, polyester, cotton, nylon and felt. Fabrics are usually selected based on the nature of the slurry being dewatered in a given application. Because filter presses are used across a wide range of industries, the characteristics of the suspended solids in a slurry can range from oily to fibrous to highly abrasive. The pH and temperature can also greatly vary.

The most common filter cloth materials are described below.

Common Filter Cloth Materials

Polypropylene

Polypropylene is the most common material. It has strong resistance to acid and alkali alike. A satin finish added to the fiber can allow for easy cake release. “PP” is a top choice for a wide range of applications, and is by far the most popular material.

Latex borders can be applied to a non-gasketed cloth to provide a better seal under pressure.

M.W. Watermark Polypropylene Filter Cloth; PP cloth; Filter press cloth specification
Click Image to Enlarge
Nylon

This durable fiber is often chosen for its long life in the face of abrasives. Though higher in cost, nylon blends offer such durability that the higher cost can be justified by longer service life.

M.W. Watermark Nylon Filter Cloth; Filter press cloth specification
Click Image to Enlarge
Polyester

Often chosen when sustained operating temperatures are over 180 degrees, or when oxidizing agents are present.

M.W. Watermark Polyester Filter Cloth; Filter press cloth specification
Click Image to Enlarge

Air Permeability Testing Matches Filter Cloth Fabrics to Specific Applications

By using a Frazier® Air Permeability Tester, M.W. Watermark™ is able to determine the air permeability of a particular filter cloth fabric, utilizing the ASTM D 737-96 standard test method for textile fabrics.

M.W. Watermark Air Permeability Testing Station
M.W. Watermark Air Permeability Testing Station
How does it work?

A sample is placed on the machine and air is drawn through the fabric. The rate of air flow passing through a fabric sample is adjusted to find an air pressure differential between two fabric surfaces. The air permeability of the fabric can then be determined by this air flow rate. The test results are reported in CFM, or Cubic Feet per Minute.

Efficiency of filtration media is directly related to air permeability. By testing the air permeability of a filter cloth fabric, our lab technicians are able to determine the filtration characteristics and determine if a given fabric is ideal for a customer’s particular dewatering application.

Learn more about our Laboratory Services.

Additional Online Resources

Visit our Filter Cloths 101 webpage for more information, including FAQ’s and cloth installation videos.

Or, visit our Filter Cloths main product page to download our product guide.

M.W. Watermark Polypropylene Filter Cloths - Ready to Ship; Filter cloth for filter press
M.W. Watermark Polypropylene Filter Cloths – Ready to Ship

Contact Us Today

Contact a member of our Sales and Service Team to discuss your particular filter press application.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

How Concrete Wastewater Can Be Recycled

More and more industries today are looking for opportunities to practice sustainability, and the concrete industry is leading the way. Concrete manufacturers, specifically those who make ready-mix concrete, are actually moving towards becoming zero-discharge facilities. A large amount of water goes into concrete processing, but instead of letting it go to waste, it’s being recycled and reused for a variety of different applications. As M.W. Watermark™ continues to supply the concrete industry with custom wastewater treatment equipment, we see firsthand some of the top ways water is being reused.

M.W. Watermark manufactures filter presses for recycling and reusing concrete wastewater

Where Concrete Wastewater Comes From

Ready-mix concrete is made from a mixture of paste and aggregates, like sand and rock. The paste is formed by cement and water and it’s used to bind all the aggregates together to make the finished product strong, yet workable. Some types of cement require more paste, and therefore water, than others. For example, if you want to achieve a stiffer consistency, less water is added to the mixture.

In addition to making the concrete, large volumes of water are also used to wash out the trucks. Water is run through the drum mixers and also sometimes used for pressure-washing. Both applications – concrete processing and truck washout – produce wastewater.

The Challenge of Reusing Wastewater

After it’s been processed, the water contains all sorts of impurities. It usually contains high amounts of suspended solids, lime, metals and sulfates with high pH levels. There are normally trace amounts of oil and grease from the equipment, too. As a result, this water can no longer be used for concrete mixing or washing, which is why it simply gets discharged. But when it’s discharged into our waterways, it disrupts aquatic ecosystems and kills fish along with their habitats.

In response to growing concerns about water availability and quality, concrete producers started looking for ways to treat this wastewater. This became especially relevant due to the Clean Water Act, which mandates the treatment of concrete wastewater. Today, these companies use filter presses and other treatment equipment to filter out most or all of those impurities to make the water clean again. While some shops put the treated wastewater back into the environment, others choose to reuse it.

M.W. Watermark manufactures filter presses for recycling and reusing concrete wastewater

Concrete Wastewater Recycling

With help from a filter press, waste from ready-mix systems, washout pits, block grinding and concrete cutting and grinding can all be recycled. As it turns out, this wastewater can be reused for both washing and concrete mixing. As long as the right quality control procedures are in place, it’s possible to use treated wastewater without diminishing the quality of the ready-mix product.

Osborne Concrete Co. is one example of a company that reuses its concrete wastewater. They were generating 50 gallons of wash water per truck. After working with M.W. Watermark to design and install a wastewater treatment process, almost 100% of the water became available for re-use. The filter press helped them cut back on costs and make it easier for them to comply with the EPA. Plus, they’re able to do their part in keeping the planet’s water supply clean and healthy.

Learn More About Filter Presses and the Concrete Industry

If you work in the concrete industry and are seeking ways to reduce the amount of wastewater you’re discharging, look to M.W. Watermark. We can help you determine the best strategy to recycle and reuse not only water, but recovered aggregates, too. Learn more about our filter presses or contact us to speak with a member of our team.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

The Importance of Water Recycling and Filtration in Glass and Stone Fabrication

Glass and stone fabrication processes both generate a large volume of wastewater. Glass and stone fabricators are finding that they need to recycle and filter their wastewater for many of the same reasons.

M.W. Watermark manufacturers filter presses for glass and stone fabrication wastewater recycling and filtration

Environmental Regulations

The Clean Water Act makes it illegal to discharge the wastewater that comes from glass and stone fabrication processes without a permit.

However, the EPA will not generally approve discharge permits in these applications because the technology to recycle this water is readily available.

Municipalities will not permit discharge to sewers because stone and glass particulates can clog pipes. Glass fines accumulate and harden like concrete!

M.W. Watermark manufacturers filter presses for glass and stone fabrication wastewater recycling and filtration

Equipment Problems Resulting from Recycling Unfiltered Wastewater

It is important to not only recycle wastewater to comply with environmental regulations, but to also use industrial filtration equipment to remove the solids.

Glass fines, also known as swarf, can wreak havoc on glass fabrication equipment when water is recycled but not filtered. This is also the case with stone particulates and most stone fabrication equipment.

Unfiltered recycling can lead to greater maintenance costs, increased downtime, decreased production, and shorter equipment life.

Glass and stone fines not only cause excessive wear on moving parts, but they also accumulate in pipes – sometimes clogging them completely. In order to avoid costly repairs and downtime, while complying with environmental regulations, it’s important to have a filter press the shop can rely on.

M.W. Watermark manufacturers filter presses for glass and stone fabrication wastewater recycling and filtration

Custom Wastewater Treatment Equipment

For over 15 years, M.W. Watermark™ has helped businesses from a wide range of industries and applications, including glass and stone fabrication, with their wastewater treatment needs. We offer custom industrial filter presses specifically tailored to glass and stone processing operations. If you have any existing tanks or pumps, we’ll be happy to incorporate them into the system design.

Contact us today. Also, be sure to visit our glass or stone fabrication wastewater recycling web pages to learn more.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Effects of Wastewater on the Environment

How Wastewater Can Harm the Environment

M.W. Watermark™ is passionate about keeping our planet’s water supply clean and usable. That’s why we dedicate ourselves to creating powerful water and wastewater treatment equipment. When wastewater gets dumped into waterways before it’s been properly treated, it can have devastating and lasting effects on the environment. Fortunately, government regulations, like the Clean Water Act, have helped keep wastewater pollution under control over the past several decades.

M.W. Watermark - Effects of Wastewater on the Environment

What is Wastewater Composed of?

Wastewater is a byproduct of industrial processing. Virtually all industries produce some type of wastewater, including the mining, oil and gas, stone fabrication and concrete industries. Depending on what’s being made or done, water might be used for cooling, transporting, washing, diluting or fabricating products. Those products continue on through the cycle, while the now dirty water, or effluent, gets left behind.

This water essentially turns into liquid waste. As a result of the processing it had to go through, it may contain any number of harmful substances. The composition of wastewater varies from one manufacturer to the next, but in general, here are some common things it might contain.

  • Heavy metals
  • Toxic chemicals
  • Oil and grease
  • Solids
  • Sludge
  • Organic and inorganic materials

As you might imagine, this effluent poses numerous hazards for humans, animals and the environment as a whole. It can be toxic, corrosive, reactive, acidic and ignitable, and accordingly it must undergo treatment before being reused or redirected into the water supply.

M.W. Watermark - Effects of Wastewater on the Environment

Dangerous Wastewater Effects

Waterways are generally most at risk to the harmful effects of wastewater. Toxic compounds in the effluent can seriously disrupt aquatic ecosystems. For example, if a large amount of biodegradable substances end up in the water, organisms will start to break them down. This is a bad thing, because when they do, these organisms use a lot of dissolved oxygen. Dissolved oxygen is critical for marine life to thrive. As it becomes depleted, fish can be impacted in life-threatening ways.

Other types of waste, like oil and grease, are harder to break down and can settle on the surface of the water. This blocks light, which photosynthetic aquatic plants need. It can also suffocate fish and get caught in birds’ feathers.

And just as heavy metals, such as lead and mercury, are toxic to humans, they’re also toxic to animals. If someone drank from or ate fish from a contaminated water source, they could be faced with serious health effects. The same is true for the animals and plants living in the water.

Other Harmful Characteristics of Effluent

When untreated wastewater gets dumped, it’s often warm or even hot. In these cases, it can elevate the temperature of the water, which further disrupts the ecosystem. Fish are cold blooded, so they rely on the water to regulate their own body temperature. If the water is too warm, it can increase respiration, feeding and movement. Additionally, the temperature of the water also affects the amount of oxygen in it.

Help Us Make a Difference

If you need to follow federal wastewater regulations and protect the environment from the damaging effects of effluent, make sure you’re using effective wastewater treatment equipment at your facility. We can design and build a custom filter press tailored to your specific solid-liquid separation needs. Give us a call at 616-399-8850 or fill out our online contact form to find out more. In the meantime, you’re welcome to look through our Filter Press Product Brochure.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Advantages of Mobile Filter Presses

Considering a Trailer-Mounted Filter Press?

Here are a Few of the Benefits…

At M.W. Watermark™, we strive to accommodate the unique needs of our customers and their jobsites. That’s why we make custom filter presses with many optional features. One of those optional features is portability. When customers come to us looking for something that can be easily moved from one location to the next, we immediately recommend our mobile filter press units – for purchase or rental. They’re just as capable of filtering large amounts at high speeds as any of our filter presses, but they have the added benefit of being able to do it in remote locations.

M.W. Watermark 1,200 mm Mobile Trailer-Mounted Filter Press
M.W. Watermark 1,200 mm Mobile Trailer-Mounted Filter Press

Who Needs a Mobile Filter Press?

In most cases, the process of water treatment or dewatering slurry takes place inside a facility. Many industries rely on filtration every day to keep operations running smoothly. So it only makes sense that their filter press becomes a permanent fixture that they can use whenever they need to.

However, that’s not how it works in every situation. Some businesses, particularly in the oil, gas and fracking industries, are not working out of a facility or warehouse. Instead, they’re out on remote sites in open fields, desert plains and oceans as they drill, mine and build. They need a filter press that can go on location with them to help speed up the process. Furthermore, companies like these don’t stay at a single location. They’re moving from jobsite to jobsite, taking all their equipment and machinery with them as they go.

Aside from that, mobile filter presses are also well-suited for short-term projects. It’s easier to move the filter press in and out as needed when it’s mounted to wheels. They’re also helpful for manufacturers that need to filter several tanks at once. Instead of having to install multiple filter presses, they can just get one and move it from tank to tank.

Mobile Filter Press Features

Our mobile filter presses are mounted on a trailer during the manufacturing process. Trailer-mounted filter presses are ideal for dewatering slurry and managing sludge remotely. M.W. Watermark offers rentals that arrive assembled, equipped with the specs you need and ready to go.

For example, our mobile filter presses are outfitted with flexible side curtains to give you easy access to the equipment during operation. They also have independently adjustable levelers. A cake chute system, which is constructed from high-quality stainless steel, directs all discharge onto the extendable slider belt conveyor.

Other features of our trailer-mounted presses include a fully electrical control panel and a water wash-down deck. Mounted overhead lighting keeps the area well-lit for use through the night. And finally, they also come with walkways, safety railings and stairs to help keep workers safe.

Find the Right Filter Press for Your Needs

Whether you need a mobile filter press or a permanent model, turn to M.W. Watermark. We have filter presses available in many different sizes with a variety of plate dimensions, ranging from 250 mm to 1,500 mm. We also offer options including manual, semi-automatic or automatic plate shifting. Browse our filter press brochure to see all the specs and customizable options we have to offer. If you’re ready to place an order or have any questions, call 616-399-8850 for a quick response.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.

Filter Cloths 101: Common Terms

The Important Role of Filter Cloths in Building a Filter Cake

Filter cloths play a critical role in the filter press dewatering process, serving as the foundation needed to build a filter cake. How is this accomplished?

A filter press is actually a depth filter, which as the name suggests, collects particles throughout the filter medium instead of just on the surface. Cake formation is a unique benefit of a filter press, as it allows for particles to continue to build on the cloth without sacrificing quality of filtration. As the cake builds on the cloth, the filtration of finer particles actually improves, allowing for the separation of particles much smaller than the openings in the filter cloth itself.

Now that we have discussed the importance of filter cloths in the functioning of a filter press, the purpose of the remainder of this blog is to provide an overview of some of the most common terms used when discussing filter cloths, regardless of industry or application.

M.W. Watermark Manufactures Custom Filter Cloths for Your Filter Press

Common Filter Cloth Terms

Cloth Blinding

When a cloth’s porosity is hindered, and the cloth no longer allows the filtrate to flow.

Monofilament Cloth

These fibers are single, smooth, rounded extrusions. “Mono” cloths have excellent cake release characteristics and resistance to blinding. This style has low particle retention. To provide a layman’s visual, this material is very similar to fishing line. These cloths have the advantage of being more permeable, allowing for higher flow rates.

Monofilament fabric also has advantages in cleaning, which can help deter microbiological contamination in food and beverage applications.

The only drawback to monofilament cloths is in their durability. Because these cloths are woven from individual strands instead of multiple fibers woven together they are more fragile, and a crack in a single strand can compromise the stability of the entire cloth.

M.W. Watermark Monofilament Filter Press Cloth
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Multifilament or “Spun” Fibers

Compared to the “mono” fiber above being similar to fishing line, with “multifilament” threads, think “yarn.” The fibers vary in size, but are grouped together in a single strand. Multifilament fibers feature good particle retention and are very durable, since a break in a single thread has very little impact on the overall stability of the cloth.

M.W. Watermark Multifilament Filter Press Cloth
Click Image to Enlarge
Mono-Multi Cloth

Mono-Multifilament fabrics have become very popular, as they combine the benefits of both “mono” and “multi” to get the best of both worlds. That is, the excellent cake release, higher flow rates and ease of cleaning of monofilament, plus the durability of multifilament fibers.

Because of these combined characteristics, mono-multi filter cloth has been found to be ideal for “lees filtration,” a solid-liquid separation process used in winemaking.

M.W. Watermark Mono-Multi Filter Press Cloth
Click Image to Enlarge
CGR vs. NG

“CGR” is an acronym for “Caulked, Gasketed, Recessed chamber.” CGR plates should provide a virtually leak-proof filter press. Cloths for these plates are octagon shaped, with a caulking rope or cord sewn into the edge of the cloth. “NG” means “Non-Gasketed.” The NG cloth is faster and simpler to install, though the trade off is that occasionally some dripping can happen when using NG cloths.

Latex Edging

A latex coating can be added to the edges of an NG cloth to help prevent leaks.

M.W. Watermark Filter Cloths - Latex Edging

CFM

“Cubic Feet per Minute” is the measure of flow or air permeability of the cloth media.

Warp and Weft

Warp is the threads that run lengthwise in a cloth. Weft is the threads that run across the width of a cloth at right angles to the warp. These are also known as filling threads. Warp should run vertically when installed.

Weave Pattern

The most common are plain, twill, and satin (or sateen).

  • Plain Weave is average in strength, cake release, and stability.
  • Twill Weave adds a diagonal rib or line to the weave, adding strength at the expense of a little stability. Cake release is average.
  • Satin Weave is popular for its excellent cake release and excellent resistance to blinding.

Additional Online Resources

Visit our Filter Cloths 101 webpage for more information, including FAQ’s and cloth installation videos.

Or, visit our Filter Cloths main product page to download our product guide.

Contact Us Today

Contact a member of our Sales and Service Team to discuss your particular filter press application.

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About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

© 2019 M.W. Watermark, L.L.C.
M.W. Watermark is a trademark owned by M.W. Watermark, L.L.C. All rights reserved.
Any third party trademarks referenced on this site are the trademarks of their respective owners, and M.W. Watermark makes no claim to such marks and is not affiliated with such companies.