Be Our Guest at NASF SUR/FIN 2017!

M.W. Watermark invites you to join us at the NASF SUR/FIN® show in Atlanta this year – with a Free Show Floor Admission!

NASF SUR/FIN 2017® is where leading surface technology companies connect, collaborate and contribute. It is the primary conference and trade show dedicated specifically to the surface technology industry.

It’s as Easy as 1-2-3!

  1. Click here to visit the NASF SUR/FIN website and learn more about the show.
  2. Click on the Attend Drop Down Menu at the top of the SUR/FIN website home page, or go directly to the Registration Page. Click the Register button.
  3. Enter code C813 on the Registration Form (Advance Registration Column). Click the Register Online button at the bottom of the page to continue to the next step and complete your registration.

We will be exhibiting in Booth #813. See you at the show!

Contact an M.W. Watermark Sales and Service Team member to learn more.

M.W. Watermark NASF SUR/FIN 2017 Guest Pass

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

How to Maximize the Life of Your Filter Cloths

Filter presses need regular maintenance to continue operating at optimal performance levels. An important part of this care is servicing the filter cloths.

As the initial barrier that removes solids from liquid in the filtration process, filter cloths experience a great deal of wear and tear. It’s important that they stay porous to achieve good filtration rates. When fine particles become lodged deep within the fabric, filtration rates can become compromised. Cleaning must be done on a regular basis to maintain full functionality of the filter press.

Filter cloth life can be shortened by certain chemicals in the slurry, mechanical wear, abrasion and blinding. Mechanical wear can be reduced by using a more durable cloth. Blinding (clogging of the cloths) often comes from “slamming” sludge into the press.

Preventative Measures

Automatic Feed Pump Control System (AFPCS)

Consider an Automatic Feed Pump Control System (AFPCS) to automatically and gradually increase pump pressure during the filtration cycle. High initial feed pump pressures can build a tightly packed layer of solids on the filter cloth. By reducing the initial feed pressure, a soft layer of slurry particles can be deposited on the cloth. Because this layer then becomes the filtering media, the filterability of the incoming slurry is enhanced.

An AFPCS can be retrofit to any filter press. Learn more about how an AFPCS allows your filter press to run at its optimum efficiency.

M.W. Watermark Filter Press with an AFPCS
M.W. Watermark Filter Press with an AFPCS

Pre-Coat

Pre-coat material is any porous substance that allows liquid to pass through. The substance should be fine enough to mix with water but not so fine as to be impassable. It is the gaps within the substance that will provide much of the actual filtration.

“Pre-coating” a filter press with perlite, diatomaceous earth or similar products can also add substantial life to cloths. This coating protects against wear and minimizes blinding.

Learn more about pre-coat and how it is applied in a filter press.

Perlite can be used as an effective filter aid for filter press pre-coat
Perlite can be used as an effective filter press pre-coat

Cloth Additions

If your filter cloths are wearing out prematurely at the center feed, a latex-reinforced cloth barrel neck can help. In cases of an especially high amount of abrasion at the neck, a rubber barrel neck can help protect that area.

M.W. Watermark Non-Gasketed (NG) filter cloths with a latex-reinforced cloth barrel neck
Non-Gasketed (NG) filter cloths with a latex-reinforced cloth barrel neck
M.W. Watermark Rubber Barrel Neck Filter Cloth
Rubber barrel neck

Cleaning Methods

Using a Pressure Sprayer

When filtration cycles become too long or the initial filtration pressure is too high, it’s time to clean the cloths. One of the easiest ways to accomplish this is by using a portable cold water pressure sprayer, as the plates do not need to be removed from the filter press. However, care must be taken when using a pressure sprayer to ensure that the cloths are not damaged. By using a fan-shaped spray pattern and staying back a few feet from the surface, the cleaning process can be accomplished without accidentally cutting the cloths. Keeping the spray pressure under 1,000 PSI is recommended as well.

Acid Washing

Polypropylene filter cloths can handle both caustic and acidic solutions, and acid washing has become a popular cleaning method for this type of cloth for specialized applications. For example, when working with sludge from metal finishing, even the best-matched cloths can blind (become clogged) after a short period of time.

In cases where frequent cleaning is required, acid washing can become the most practical method of cleaning cloths. Plates do not need to be removed from the filter press, and a filter press can be equipped with a special manifold and system for cloth washing.

Filter Press with a Cloth Washing Manifold Installed
Filter Press with a cloth washing manifold installed

However, other filter cloth materials such as nylon, polyester and felt cloths may become damaged by using chemical cleaners.

Also, it’s important to note that acid washing is only an option if the chemistry of the sludge is reversible. Therefore, acid washing is not effective in situations that include laundry, food waste and biological applications.

M.W. Watermark has filter cloth experts on staff that can help you determine the best cleaning method for your particular application, and also talk through important safety precautions.

Read more about options for cleaning your filter cloths.

Filter Cloths – Serving as the Front Line

Filter cloths serve as the “front line” in a dewatering process, providing the foundation needed to build a filter cake, so it’s important to keep them in peak operating condition. The guidelines above should help you with this critical aspect of maintaining your filter press.

M.W. Watermark - Filter press cake from concrete wastewater treament
Filter cake from concrete wastewater treatment

Contact M.W. Watermark to learn more about prolonging the life of your filter cloths and other filter press maintenance topics. 

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

How to Save Money in Metal Finishing While Remaining Environmentally Friendly

Metal plating and finishing requires an ample amount of various chemicals for an efficient operation. However, the chemicals found in these wastewater streams are not only expensive to remove but also potentially damaging to the environment. Read on for tips for avoiding these negative impacts as well as industry best practices for wastewater treatment and disposal.

Collecting the Right Information

When it comes to metal finishing wastewater treatment, it’s important to understand certain baseline information. Four areas to keep in mind are rinse tanks, ventilation systems, acid cleaners and acid etches, and alkaline cleaners. Making a layout of these areas to collect appropriate information can help clarify the process and build awareness of initial costs.

M.W. Watermark Metal Finishing Wastewater Treatment Equipment

Rinse Tanks

The metal finishing industry involves processes that use more water than many other industries, resulting in stringent EPA regulations. The most cost-effective and environmentally sound options for metal finishing wastewater treatment are multiple counterflowing immersion rinse tanks, reactive rinsing, spray rinsing, and combination rinses.

Metal finishing operations have an in-house treatment system so that acids, alkali, oils, and dissolved metals are economically disposed of and sent to sewers since the water becomes unsuitable for use again. However, reverse osmosis, a relatively simple and low-maintenance system, can help recover at least half of the water and make it safe for use.

Ventilation Systems

Ventilation systems remove dangerous fumes from process tanks. The highest cost involved with ventilation is the electricity used for the operation. The secondary cost depends on the location and the reconditioning (heating or cooling). Some industries utilize automatic tank covers and fan controls, which can reduce the fumes, thus resulting in lower costs.

Acid Cleaners and Acid Etches

Acids used in metal plating are cleaned via acid baths. If the acid bath does not have effective process controls, it can lead to defective metal plating and finishing over time because of inconsistencies in the acid strength level. An ineffectively managed acid tank can become useless and will have to be disposed of, resulting in costs to replace the tank and the acid cleaners. To extend the life of the acid bath and reduce costs, any dissolved metal content should be removed through metal dissolving methods such as diffusion dialysis and acid sorption.

Alkaline Cleaners

During metal finishing wastewater treatment, alkaline cleaning tanks clean a large amount of dirt, oils, grease, wax, polishing compound, and light oxides at the beginning of the process. It is important to keep track of the cleaning strength of the alkaline cleaners to reduce costs and the environmental footprint.

 Metal Finishing Wastewater Treatment

The metal finishing process produces wastewater that must be treated to separate the dissolved metals in the wastewater from the liquids following chemical treatment and precipitation. A filter press with polypropylene filter plates and cloths is typically used, as polypropylene is resistant to the corrosive nature of this type of waste stream. Gasketed filter plates and cloths (versus non-gasketed) are also well suited for a corrosive slurry, as there is less chance of leakage.

Metal Finishing Wastewater Treatment Equipment - M.W. Watermark New and Rebuilt Filter Presses
M.W. Watermark New and Rebuilt Filter Presses
Metal Finishing Wastewater Treatment Equipment - M.W. Watermark Gasketed Filter Plates and Cloths
M.W. Watermark Gasketed Polypropylene Filter Plates and Cloths

After the metal finishing wastewater has been processed via pressure filtration, the resulting filter cake is then discharged from the filter press. The filter cake can then be further dehydrated using a continuous sludge dryer.  For example, the M.W. Watermark continuous sludge dryer can reduce the waste volume and weight significantly, offering an average yearly savings in disposal costs of up to 60%.

Metal Finishing Wastewater Treatment Equipment - M.W. Watermark Continuous Sludge Dryers
M.W. Watermark Continuous Sludge Dryers

Not only can changing up a business’s wastewater cleaning processes reduce overall costs, but it can also help the industry remain competitive and environmentally sound.

Contact M.W. Watermark to learn more about saving money in metal finishing wastewater treatment while preserving the environment.

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

How Does an Oil Coalescing Separator Work?

The M.W. Watermark Oil Coalescing Separator is designed to remove free non-emulsified oils, diesel, gasoline and fuels from a waste stream, resulting in an effluent quality of 10 mg/l or less of contaminants 20 microns and larger.

M.W. Watermark Oil Coalescing Separator

The Oil Coalescing Separator operation is based on closely spaced oil attracting media that promotes the impact and formation of larger oil particles. As the oil droplets increase in size their rise rate to the water surface also increases.

The influent water enters the separator through an inlet baffle that directs the water through the media bundle. The media expands the surface area of the separator giving the oil more room on which to combine.

As the oil droplets accumulate on the media and coalesce they develop into larger droplets that flow up the surface of the media, detach and rise to the water surface. Surface oil decants by gravity into a segregated oil reservoir where it can be removed from the tank.

Heavier solids will slide down the surface of the media into the sludge chamber at the bottom of the tank for periodic removal. Virtually oil free water travels under an oil reservoir baffle, over an adjustable weir and into a clean water effluent chamber. The water is then gravity discharged from this chamber.

M.W. Watermark Offers 19 progressive sizes of Oil Coalescing Separator models

Our OCS models range from 10 gpm to 5,000 gpm.

All of our high-quality Oil Coalescing Separator models are assembled in the U.S.A.

Pilot units are available for rental or purchase.

Contact M.W. Watermark to learn more or request a quote.

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

M.W. Watermark Offers a Full Range of Laboratory Services

M.W. Watermark Laboratory ServicesLaboratory services can help determine the most effective filter press equipment, equipment sizing, filtration media required, and dewatering techniques for your specific application. This includes the recommended treatments, chemicals, and dosages required to form an ideal cake in a filter press.

Our services range from feasibility testing of your materials to offering portable pilot units for on-site testing. We can determine the most effective feed pressures, fill times, filter media and sludge conditioning.

Laboratory services can help you ensure a better informed equipment purchase, or maintain maximum performance of your current filter press, including most makes and models.

M.W. Watermark Lab Filter Press Cake - Laboratory Services
Lab cake sizes available from .75″ to 2.00″
M.W. Watermark 320mm Pilot Filter Press - Laboratory Services
M.W. Watermark 320mm Pilot Filter Press
M.W. Watermark has recently added Frazier® Air Permeability Testing to our growing list of laboratory services.

By using a Frazier® Air Permeability Tester, we are 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 - Laboratory Services
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.

M.W. Watermark Air Permeability Testing - Laboratory Services
Venturi nozzles of increasing diameters – used to measure air flow

When a customer is looking to replace their existing filter press cloths, and the type of fabric is not known, the air permeability test also helps us match a customer’s cloth sample with the correct fabric spec. In turn, we are able to test for quality control and performance specs of incoming rolled goods.

Contact M.W. Watermark to learn more about our laboratory services.

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

How Recycling Car Wash Wastewater Benefits Business

Recycling car wash wastewater is an often-overlooked way to cut costs, ensure company sustainability, and help the environment. Learn more about the benefits of car wash wastewater treatment and how the process works.

Why Recycle Water?

It’s no secret that humans consume millions of gallons of water per day. A typical car wash owner’s business pumps out 10 to 15 gallons of “dirty” water with every cycle. What if there was a way to recycle some of this water for subsequent washes? Most business owners aren’t aware that there is a clean way to do this: with a dewatering machine known as a filter press.

There are many models of filter presses available at varying sizes and configurations. Car wash wastewater treatment can help reduce costs by potentially lowering disposal costs. Plus, using water filtration systems deters possible usage restrictions placed upon the company and provides environmental benefits to the area by increasing the natural flow and growth of local ecosystems.

M.W. Watermark Car Wash Wastewater Treatment Equipment - Filter Press

The Water Recycling Process

Water recycling makes use of filter presses to separate liquids from solids. Filter presses can be purchased as new or rebuilt equipment. Instead of going into the sewer or out into the environment, water containing particles of dirt, mud, and other debris enters the filter press.

Up to 50% of the “dirty” water goes through a pressure filtration process and unwanted debris is removed from the water. Best of all, the dewatering process often keeps the cleaning agents in the filtrate for additional uses. By keeping dirty water out of the local ecosystem, car wash operators can utilize a cost-effective solution that simultaneously benefits their surrounding water sources.

For business owners hoping to one day expand their business, undergoing car wash wastewater treatment using a filter press is a no-brainer. M.W. Watermark provides businesses with filter presses crafted from high quality parts. With years of experience, we are prepared to customize the ideal wastewater treatment solution for your company. Best of all, all of our equipment is made in the U.S.A. by professionals who are passionate about water preservation and future sustainability.

Contact M.W. Watermark to learn more about car wash wastewater treatment equipment.   

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

Benefits of Lime Softening for Municipal Waterworks Sourcing Groundwater

Municipal waterworks generally choose water softening treatment methods as a function of cost, water quality, infrastructural capacity, and the degree of hardness the customers demand. As a rule, lime softening water treatment works best in systems that source groundwater with low to undetectable non-carbonate hardness levels. Softening water with high non-carbonate hardness may necessitate the combination of lime and soda ash. In either case, lime softening is ordinarily more economical than the alternative method of water treatment with caustic soda.

M.W. Watermark - Filter Presses for Lime Softening Water Treatment Application
Two M.W. Watermark 1500mm Filter Presses

Benefits of Lime Softening

Lime softening water treatment not only effectively reduces the dissolved mineral quotient in municipal and industrial water supplies but it also directly and positively impacts municipal, commercial, and consumer budgets. Because softened water tends to form less scale, consumers use fewer household cleaners, which in turn reduces the toxic chemical content of municipal greywater. As a result, filter presses at greywater treatment plants, and industrial efforts like laundry wastewater recycling, operate more efficiently and cost-effectively.

Other potential plusses of lime softening water treatment include the removal of heavy metals, radioactive elements, and other toxins such as radium 226 & 228, uranium, and arsenic. Lime softening eliminates iron, manganese, silica and fluoride, as well as certain organic compounds and possibly even Giardia lamblia cysts. Lime softening water treatment reduces total organic carbon (TOC) content and surface water turbidity. Simultaneously, it increases the Langelier Saturation Index (LSI), which in some cases can aid in pipe corrosion control.

Innovative, Eco-Sustainable Cake Disposal

Proper disposal of the filter press cake produced by lime softening is strictly regulated and often costly. One uniquely beneficial disposal solution is the recycling of the filter cake as agricultural fertilizer. This calcium-rich product can then be distributed or monetized either to restore the pH balance in poor or depleted soil to promote plant growth or as a liming material for farmers.

In states where abandoned strip mines leach acid water into the watershed, pumping a solution containing filter cake from lime softening water treatment into the mines can help abate environmental pollution downstream—by neutralizing the acid water at the source of contamination. In this way, governments can reclaim blighted land to provide economical discharge storage to save on material treatment costs, while at the same time helping to conserve local water resources by reducing pollution—all long-term, cost-saving benefits.

Contact M.W. Watermark to learn more about lime softening water treatment.

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

How Drought-Stricken California Recycles Wastewater

Wastewater treatment professionals know that water recycling—the process of cleaning and repurposing wastewater—is not a new concept. All kinds of industries reuse water in their operations, including industrial laundries, car and truck washing facilities, metal finishers, and more. Municipal wastewater treatment facilities also recycle, collecting water from sewage, cleaning it, and using it for nonpotable purposes, such as landscaping and agriculture.

A growing number of local governments, however, are taking their water recycling efforts a step further, treating wastewater well enough that it becomes potable, or fit for human consumption and use. California has been leading this charge in the face of ongoing problems with drought and an ever-increasing population.

M.W. Watermark - Wastewater Treatment - Water Recycling

The West Coast Solution – Wastewater Treatment

Beginning with the Groundwater Replenishment System in 2008, Orange County, California has been replenishing the water supply of over half a million residents with thoroughly treated wastewater. Their equipment handles upwards of 100 million gallons of wastewater every day, and the scope of the operation has caught the eyes of water treatment officials from around the world.

Because of the area’s struggles with drought, the Orange County system has pioneered “indirect” reuse, a system which puts an environmental buffer—usually a groundwater basin or reservoir—between wastewater treatment and the municipal water supply. Their three-step treatment strategy has also become an industry standard, using microfiltration, reverse osmosis, and an ultraviolet treatment combined with hydrogen peroxide to restore wastewater to the quality of distilled water.

Looking to The Future of Water Reuse

Following California’s model, some municipalities across the United States have been using wastewater treatment solutions to solve problems they face locally. In the Pacific Northwest, for example, states have been experimenting with water reuse to address wastewater temperature regulations.

It’s also catching on that recycling water is not only a way of saving money but also a benefit to local ecosystems. Freshwater lakes and rivers are no longer the only sources of potentially potable water, and sustainable reuse prevents polluted wastewater from ending up in these ecosystems in the first place.

While water reuse is expensive and requires a lot of energy, the costs are still less than the traditional method of finding and importing water from new sources. And although winning over public opinion about reusing wastewater is a challenge, California’s successful model is increasing public awareness and acceptance. With more public outreach, continued improvements in wastewater treatment technology and practices, and innovative new ways of thinking about water recycling, the future of sustainable potable water looks bright.

Contact M.W. Watermark to learn more about recycling water using wastewater treatment equipment.  

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.

The product names, logos, brand names, and other trademarks listed above are the intellectual property of their respective trademark owners; M.W. Watermark is not affiliated with such trademark owners in any way.

Choosing the Right Hydraulic System and Controls for Your Filter Press

Hydraulic Systems, Control Elements and the Filter Press

The type of hydraulic system best suited for a dewatering application typically depends on the size of the filter press required. Three common types of filter press hydraulic systems include air-operated, electric and manual.

Filter press controls are a factor of both the type of hydraulic system that will be utilized, as well as other specifics such as the options for automated valves, drip trays, an automatic plate shifter, and/or an automatic high pressure cloth washing unit. Various manifold processes can also be more easily facilitated by the use of proper controls, such as Air Blow, Even Fill, Pre-Coat, Acid Wash, Core Blow, Cake Wash, and more.

M.W. Watermark’s team of filter press experts can work with you to determine the best hydraulic system, controls, and other options for your particular dewatering project. Retrofits are also available. 

Air-Operated Hydraulics and Controls

For filter press sizes 630mm through 1000mm, air hydraulics are included as standard.

M.W. Watermark 630mm Filter Press with Air-Operated Hydraulics
M.W. Watermark 630mm Filter Press with Air-Operated Hydraulics
How does an air-powered hydraulic pump work?

For added operator and equipment protection, the hydraulics are enclosed within the leg of the filter press that supports the hydraulic cylinder. 100 psi air is used to pressurize an oil reservoir that is used to push the plate stack closed. Once the plate stack is closed, a high pressure air-operated hydraulic pump clamps the plate stack with a force, plus a safety factor, to counteract the pressure of the slurry feed.

Air-powered hydraulic pumping units convert plant air to hydraulic pressure through a simple ratio system that uses a large air piston area at low pressure to produce a high hydraulic pressure on a small area hydraulic piston. Automatic reciprocation is controlled by the action of a pilot operated selector valve in the pneumatic section of the pump.

As the hydraulic output approaches the desired pressure dictated by the air pressure regulator setting, the pump slows down and finally stalls when the hydraulic force balances the air force. Hydraulic force is maintained with no consumption of power.

M.W. Watermark 630mm Filter Press - Inside the Air-Operated Hydraulic Cabinet
M.W. Watermark 630mm Filter Press – Inside the Air-Operated Hydraulic Cabinet

When the cycle is complete, the air-operated hydraulic system releases the pressure within the cylinder and uses air pressure to retract the follower for filter cake discharge. The air hydraulic control switches and gauges are mounted in either the left or right hand side of the leg of the filter press to suit the installation.

Click below to visit our Filter Press Hydraulic Systems webpage and watch a video overview of our air operated hydraulic system – demonstrating its functionality including closing, clamping and opening times. 

Air Operated Hydraulic Filter Press Overview Video

What control options are available for an air-operated hydraulic filter press?

Visit our Filter Press Controls webpage to learn more.

M.W. Watermark Filter Press with Air-Operated Hydraulics and Optional AFPCS
M.W. Watermark Filter Press with Air-Operated Hydraulics and Optional AFPCS

Electric Hydraulics and Controls

For filter press sizes 800mm through 1500mm, electric hydraulics are optional to decrease filter press opening and closing times.

How does an electric-powered hydraulic pumping unit work?

Electric-powered hydraulic pumping units maintain the hydraulic pressure, and if the pressure exceeds the relief setting this pressure is vented – keeping the pressure within the specified range.

For added operator and equipment protection, the hydraulic power unit (HPU) is enclosed within the leg of the filter press that supports the hydraulic cylinder. The HPU includes a high volume / low pressure pump to open and close the plate stack quickly and a low volume / high pressure pump that clamps the plate stack. Once the plate stack is closed, the high pressure hydraulic pump clamps the plate stack with a force, plus a safety factor, to counteract the pressure of slurry feed.

M.W. Watermark 1500mm Filter Press - Electric-Powered Hydraulic Pumping Unit
M.W. Watermark 1500mm Filter Press – Electric-Powered Hydraulic Pumping Unit

Electric hydraulics are controlled by the M.W. Watermark Electric Hydraulic Control System (EHCS), which monitors the status of the system and provides an emergency stop push button, disconnect switch, and touch screen control of the filter press hydraulics.

Learn more about the M.W. Watermark Electric Hydraulic Control System (EHCS).

M.W. Watermark Electric Hydraulic Control System (EHCS)
M.W. Watermark Electric Hydraulic Control System (EHCS)

Manually-Operated Hydraulics and Controls

A manual hand pump to extend the spring return hydraulic cylinder is standard for the 470mm filter press.

How does the manually-operated hydraulic pump work?

The hydraulic cylinder is swung from the “up” to the “clamp” position and the hand pump is operated to build clamping pressure. At the end of the dewatering cycle, the hydraulic pressure is released and the cylinder is retracted by an internal spring. The cylinder is then lifted to the “up” position and the follower is manually pulled back to the end of the press. The filter plates are then manually shifted to discharge filter cake.

This option requires hands-on “pumping” to get the job done. However, when working with a smaller filter press such as the 470mm, or when an air supply or electrical power is not available on the job site, manually-operated hydraulics may be the best solution.

M.W. Watermark Manually Operated Hydraulics Filter Press

Note: To eliminate the requirement of pumping by hand, an air-operated single-acting closure system (for closing only) is available as an option.

Optional Air-Operated Single-Acting Closure System
Optional Air-Operated Single-Acting Closure System

Click below to watch a video on our Hydraulic Systems webpage on how to open/close a manually-operated hydraulic filter press.

M.W. Watermark Manual Hydraulic Filter Press Video

Contact an M.W. Watermark Sales and Service Team member 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.

Product names, logos, brands, and other trademarks featured or referred to within this document are property of their respective trademark holders. These trademark holders are not affiliated with M.W. Watermark in any way.

Dissolved Air Flotation: A Cost Effective Clarification Technique

When it comes to wastewater treatment, it’s important to utilize a process that handles the job efficiently without breaking the bank. Dissolved Air Flotation (DAF) wastewater treatment is recognized globally as an effective system with low capital and operating costs.

M.W. Watermark Dissolved Air Flotation (DAF) Clarifier
M.W. Watermark Dissolved Air Flotation (DAF) Clarifier

What Makes Dissolved Air Flotation Cost-Effective?

When compared to other technologies such as membranes and centrifuges, the DAF has the least expensive capital cost based on a gallon per minute basis.  The M.W. Watermark DAF is simple to operate and requires minimal maintenance, which makes it ideal for industrial users.  Operating costs are also low because the DAF uses fractional horsepower motors rather than large scale motors many membranes and centrifuges require.

Contact M.W. Watermark to learn more. We will work with you to help determine which wastewater treatment approach is best for your particular application.

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.

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