Wastewater Clarifiers – Slant Plate (SPC) and Low Profile (LPC)

When it’s necessary to remove particles from a large volume of water, often the best option is to go with a wastewater clarifier. M.W. Watermark offers high quality, American-made slant plate and low profile clarifiers that are designed to achieve the ultimate goal of keeping the planet’s water supply safe for generations to come.

SPC

M.W. Watermark Slant Plate Wastewater Clarifier Series

LPC

M.W. Watermark Low Profile Clarifier: LPC-4-330

M.W. Watermark Low Profile Clarifiers on Truck

The M.W. Watermark Slant Plate Clarifier (SPC)

Our slant plate wastewater clarifier is one of the most efficient methods available for the removal of solids from process liquid and waste. While there exists a variety of designs for such devices, utilizing inclined plates allows us to pack the widest possible combined plate area into a compact floor space. Plates are placed close together, and settling surfaces are stacked to form a settling area 10 times larger than the total area occupied by the machine.

M.W. Watermark Slant Plate Wastewater Clarifier Series

M.W. Watermark SPC-20 and SPC-40 Skid Mounted Clarifiers with Tanks and Pumps

Click Here to Download Our Slant Plate Clarifier Brochure

Learn More on Our Blog…

“Slant Plate vs. Low Profile Clarifier” –  Read more.

“What is a Slant Plate Clarifier?” –  Read more.

“Slant Plate or Dissolved Air Flotation (DAF) Clarifier?” –  Read more.

“Coating Types for Your Industrial Filtration Equipment”Read more.

Need feed pumps, tanks or an electrical control cabinet? M.W. Watermark can supply everything you need for a complete wastewater treatment system.

Does your spec call for a Dissolved Air Flotation (DAF) Clarifier? Visit our DAF webpage to learn more. 

Slant Plate Clarifier Product Features

Within our range of slant plate clarifiers, we offer nine standard-sized models, handling between 5 and 400 GPM, a sludge holding capacity between 17 and 960 gallons, and a plate area of between 16 and 1,680 square feet. That large capacity comes at very little cost in terms of floor space; sizes range from 45″ x 23″ to 170″ x 120″, with heights ranging from 51″ to 147″. The machines feature no moving parts, constructed using 1/4″ steel and dye-pen tested welding. Integral flash mixing and flocculation tanks help to increase efficiency, and the entire structure is sandblasted, primed, and painted to provide maximum chemical resistance. Each device comes equipped with 1/4″ thick removable PVC settling plates, dual sludge outlet flanges, sludge sampling ports, and a large side-access hatch to allow for easy maintenance.

Available Options

In addition to the standard features, our slant plate clarifiers can also be equipped with:

  • Mixers for flash and flocculation tanks.
  • Coal-tar epoxy interior coating (other coatings and materials are available).
  • Influent feed and sludge discharge pumps.
  • Custom designs available.
  • PolyMark™ polymer delivery systems.

Photos of Selected Models

M.W. Watermark SPC-20 Slant Plate Clarifier

SPC-20

M.W. Watermark Slant Plate Clarifier - Slant Plate Clarifier – Top View: Showing flash mixing tank, flocculation tank, and inclined plates

Flash Mixing Tank, Flocculation Tank, and Inclined Plates

M.W. Watermark SPC-10 Slant Plate Clarifier - Inclined Plate Clarifier

SPC-10

 

M.W. Watermark SPC-80 Slant Plate Clarifier - Inclined Plate Clarifier

SPC-80

 

M.W. Watermark SPC-40 Slant Plate Clarifier - Stainless Steel - Inclined Plate Clarifier

SPC-40 (Stainless Steel)

M.W. Watermark SPC-80 Slant Plate Clarifier - Shown with Optional Mixers - Inclined Plate Clarifier

SPC-80 (Shown with Optional Mixers)

M.W. Watermark Slant Plate Wastewater Clarifier Series - SPC-40 with Tnemec Internal Coating

SPC-40 (Tnemec Chemical-Resistant Internal Coating)

M.W. Watermark Slant Plate Wastewater Clarifier Series; SPC-150 with Enduroliner External Coating

SPC-150 (Enduroliner™ External Coating)

Slant Plate Clarifier System Design

Fluid is fed into the top of the wastewater clarifier (A) and flows under a baffle to the integral flash mixing tank (B). At this point, a flocculating agent may be added with a PolyMark™ polymer blending system, and is blended with the fluid using an optional high-speed mixer. From the flash mixing tank, the fluid flows over a baffle into the integral flocculation tank (C), which may include an optional low-speed mixer. From here, the fluid flows through the feed channel, between the two plate stacks, and down to a sludge chamber, located at the bottom of the structure. Large particles begin to drop out of suspension as the velocity of the fluid decreases.

M.W. Watermark Slant Plate Clarifier - Inclined Plate Clarifier - Diagrams

As the liquid enters the bottom of the plates and flows between settling plates, it maintains a low velocity, laminar flow profile which allows the suspended solids to settle on the lower plate, then flow downward to the sludge holding tank. While the solids are settling along the plate surfaces, the fluid is gradually heading upward through the plate stacks, over the weirs, and into the discharge trough.

M.W. Watermark Slant Plate Clarifier - Inclined Plate Clarifier - Illustration

Finally, the clarified effluent is discharged through a flanged pipe connection. Through sample ports, operators are able to judge the sludge level, which is periodically pumped into a batch storage tank for further liquid-solid separation via an M.W. Watermark Filter Press and eventual disposal.

M.W. Watermark SPC-5 Slant Plate Clarifier - Inclined Plate Clarifier

SPC-5

Key
A-C Flash & Flocculation Tanks
D Influent
E Clean Effluent Liquid
F Modular Laminar Plates
G Thickening Sludge Ports
H Sludge Removal
I Access Hatch
H Sludge Removal
J Baffle
K Overflow Weir
L Waterline

M.W. WATERMARK SLANT PLATE CLARIFIER SPECIFICATIONS

Slant Plate Clarifier (SPC) Model SPC-5 SPC-10 SPC-20 SPC-40 SPC-80 SPC-150 SPC-200 SPC-300 SPC-400
Design Flow Maximum (GPM) 5 10 20 40 80 150 200 300 400
Flash Tank Mix Volume (gal) 4.4 4.5 38 50 79 110 110 186 186
Flocculation Tank Volume (gal) 6.5 20.5 62 99 189 316 316 742 742
Total Pre-Treatment Vol. (gal) 10.9 25 100 149 268 426 426 928 928
Effluent Piping Connection (Class 150 Flange) 1″ 3″ 4″ 4″ 4″ 6″ 6″ 8″ 8″
Solids Discharge Connection (Class 150 Flange) 1″ 3″ 4″ 4″ 4″ 4″ 4″ 6″ 6″
Sludge Capacity (gallons) 17 42 88 150 275 469 611 834 960
Plate Area (ft2) 16 39 87 160 300 560 868 1,167 1,680
Projected Plate Area (ft2) 9.4 23 50 92 172 321 497 670 964
Empty Shipping Weight (lb) 765 1,400 2,065 3,600 4,800 7,400 11,000 13,200 16,500
Full Operating Weight (lb) 1,325 2,875 5,310 9,000 15,480 22,900 32,760 58,300 60,320
Overall Length 45″ 55.5″ 70″ 87″ 102″ 135″ 163″ 185″ 210″
Overall Width 23″ 44″ 60″ 60″ 73″ 76.5″ 77″ 100″ 100″
Overall Height 51″ 64″ 94″ 104″ 130″ 147″ 147″ 145″ 143″
Design Solids Removal (200ppm influent) 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+
Underflow Solids (% by weight) 1-2% 1-2% 1-2% 1-2% 1-2% 1-2% 1-2% 1-2% 1-2%

*Removal efficiencies are contingent upon proper chemical make-up and application.

The M.W. Watermark Low Profile Clarifier (LPC)

M.W. Watermark low profile clarifiers are designed to provide efficient solids removal from a wide range of waste and process liquids. The settling plates are inclined at an angle of 55° with 1-inch spacing. The slope of the plates allows the solids to settle by gravity while the fluid moves upward through the plate stack.

Stacking the plates reduces the floor space required by the low profile clarifier compared to a horizontal clarifier. The inclined plate design allows the total gravity settling area to be as much as ten times the floor space occupied by the clarifier.

M.W. Watermark offers two series of low profile clarifiers, depending on ceiling height and design flow needs.

The LPC-4 Series offers a design flow maximum ranging from 30 to 300 GPM. – Download brochure

The LPC-8 Series ranges from 165 to 1,100 GPM. – Download brochure

M.W. Watermark Low Profile Clarifier: LPC-4-330
M.W. Watermark Low Profile Clarifier (LPC) 4 Series

Low Profile Clarifier Product Features

  • Standard models up to 300 GPM (LPC-4 Series) and up to 1,100 GPM (LPC-8 Series).
  • Compact size minimizes floor space requirements.
  • Heavy duty steel construction, welds are dye penetrant tested.
  • Carbon steel units are sandblasted and two coats of epoxy applied to ensure full coverage and superior chemical resistance.
  • 1/8″ polypropylene plates standard.
  • Sludge outlet flanges.
  • Access hatches standard.

Available Options

In addition to the standard features, our low profile clarifiers can also be equipped with:

  • Chemical Addition Tanks (CAT) – Chemical pre-treatment for optimal solids removal. Tanks include mixers, chemical pumps and NEMA 4X UL-508A labeled panel.
  • Influent feed, sludge discharge and effluent pumps.
  • Custom designs available.
  • PolyMark™ polymer delivery systems.

Low Profile Clarifier System Design

The raw enters the inlet chamber through a distribution baffle which disperses the water across the entire width of the tank. The inlet chamber reduces the velocities and turbulence in the water. Flow exits the bottom of the chamber into the sludge chamber.

From the sludge chamber flow then enters the bottom of the plate stacks and flows between the settling plates. Between each of the plates, the fluid has a low velocity, laminar flow profile which encourages the remaining solids to settle on the surface of the lower plate and flow downward to the sludge holding chamber.

As the solids are settling along the plate surfaces, the fluid is moving upward through the plate stacks, over and adjustable weir and into the effluent trough.

Clarified effluent is then discharged through an effluent flange. Sludge is periodically drawn off the bottom of the sludge holding tank at the bottom of the clarifier.

Sample ports can be provided to assist with determining the sludge level, which is periodically pumped to a batch storage tank for further solid-liquid separation via an M.W. Watermark filter press for eventual disposal.

Low Profile Clarifier (LPC) Diagram

M.W. WATERMARK LOW PROFILE CLARIFIER (LPC) 4 SERIES – SPECIFICATIONS

Low Profile Clarifier (LPC) Model LPC-4-110 LPC-4-220 LPC-4-330 LPC-4-440 LPC-4-550 LPC-4-660 LPC-4-770 LPC-4-880 LPC-4-990 LPC-4-1100
Design Flow Maximum (GPM) 30 55 85 110 140 165 195 220 250 300
Inlet/Outlet Connections (Class 150 Flange 2 ½” 4″ 6″ 6″ 6″ 6″ 8″ 8″ 8″ 8″
Solids Outlet Connection (Class 150 Flange) 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″
Projected Plate Surface Area (ft2) 110 220 330 440 550 660 770 880 990 1,100
Empty Shipping Weight (lbs.) 1,800 2,400 3,200 4,000 4,800 5,600 6,400 7,200 8,000 8,800
Flooded Weight (lbs.) 6,000 11,000 17,000 22,000 27,000 32,000 37,000 42,000 47,000 52,000
Overall Length 7′-0″ 7′-0″ 7′-0″ 7′-0″ 7′-0″ 7′-0″ 7′-0″ 7′-0″ 7′-0″ 7′-0″
Overall Width 2′-1″ 4′-1″ 6′-1″ 8′-1″ 10′-1″ 12′-1″ 14′-1″ 16′-1″ 18′-1″ 20′-1″
Overall Height 7′-7″ 7′-7″ 7′-7″ 7′-7″ 7′-7″ 7′-7″ 7′-7″ 7′-7″ 7′-7″ 7′-7″
Design Solids Removal (Up to 1,000 mg/l) 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+

*Removal efficiencies are contingent upon proper chemical make-up and application.

M.W. WATERMARK LOW PROFILE CLARIFIER (LPC) 8 SERIES – SPECIFICATIONS

Low Profile Clarifier (LPC) Model LPC-8-660 LPC-8-880 LPC-8-1100 LPC-8-1320 LPC-8-1540 LPC-8-1760 LPC-8-1980 LPC-8-2200 LPC-8-2420 LPC-8-2860 LPC-8-3300
Design Flow Maximum (GPM) 165 220 300 330 385 440 500 550 630 950 1,100
Inlet/Outlet Connections (Class 150 Flange 6” 8″ 8″ 10″ 10″ 10″ 12″ 12″ 12″ 14″ 14″
Solids Outlet Connection (Class 150 Flange) 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″ 4″
Projected Plate Surface Area (ft2) 660 880 1,100 1,320 1,540 1,760 1,980 2,200 2,420 2,860 3,300
Empty Shipping Weight (lbs.) 5,700 7,000 8,100 9,100 10,600 12,600 14,800 15,000 16,000 19,500 22,000
Flooded Weight (lbs.) 29,000 38,000 47,000 56,000 65,000 74,000 83,000 92,000 100,000 120,000 140,000
Overall Length 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″ 9′-6″
Overall Width 6′-1″ 8′-1″ 10′-1″ 12′-1″ 14′-1″ 16′-1″ 18′-1″ 20′-1″ 22′-1″ 26′-1″ 30′-1″
Overall Height 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″ 11′-6″
Design Solids Removal (Up to 1,000 mg/l) 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+ 95%+

*Removal efficiencies are contingent upon proper chemical make-up and application.

Contact M.W. Watermark

To learn more, please contact the M.W. Watermark Sales and Service team.