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Clarifier

How does an inclined parallel plate clarifier work?

The Met-Chem clarifier uses the time proven concept of inclined plate clarification. This type of clarifier uses gravity in conjunction with the projected settling area of the 60 degree angle plastic parallel plates to settle solids from the pre-treated liquid flow. This treated liquid flows first to the flocculation tank where polymer is added to promote floc growth, then down to the bottom of the clarifier and up through the plate pack(s) while the solids settle out to the bottom sludge cone or cones – depending upon the size.  The solids are intermittently taken from the bottom cone tank for further setting of the solids and then, finally to a filter press for final dewatering. (Click here for clarifier case studies and FAQ's)

Clarifier - inclined parallel plate clarifier

60 GPM Met-Chem Wastewater Treatment Clarifier with flocculation tank, sludge blow-down system and diaphragm pump

Clarifiers for wastewater treatment, manufactured by Met-Chem are the inclined parallel plate design that are used as part of a wastewater treatment system for solids settling.  They are constructed of carbon steel with coal tar epoxy lining on the inside, and epoxy coating on the exterior. The internal plate packs are set at 60 degrees for optimum settling and are constructed of a coal tar epoxy-coated steel shell with plastic plates.

Met-Chem's clarifiers offer these special benefits

  • Unit is Completely Assembled
  • Low Installation
  • Conservative Design 0.2 GPM/Ft2
  • Completely Automatic, Gravity in Gravity Out
  • Reduced Floor Space
  • Large Compartment Flocculation Tanks with Mixer for Extra Retention Time (approximately 50-60 minutes)

Meets EPA Discharge Limits for Metal Finishing Waste

 

Clarifier Sludge Blowdown System
Sludge Blow-Down System: After a predetermined time the automatic pinch valve will open and the diaphragm pump will start pumping sludge from the clarifier cone to the sludge holding tank. System complete with controls, valve and diaphragm pump.

To establish more effective sludge collection, we would recommend a sludge blow down system.

This sludge blow-down system is designed to monitor the time the Clarifier is in use, i.e. when the pump that feeds the beginning of the gravity flow waste stream leading to the Clarifier, the timer is timing. After the predetermined time has elapsed, the controller will automatically open the discharge valve and activate the discharge pump to the sludge thickening Tank, and then automatically turn off the pump and close the valve. System includes: Sludge Valve, air vale and control panel with timers and cast iron diaphragm pump.

Clarifier Plate Packs

Met-Chem uses inclined parallel plates in both our square and rectangular clarifiers.  These plates provide increased settling capacity by reducing the vertical distance a suspended particle must travel.  Plastic plates that are inclined at a 60 degree angle slope upwards in the direction of flow. This structure creates a large number of narrow parallel flow pathways encouraging uniform settling.  The stabilized solids collect on the plates, become heavier and slide back down the inclined plate to the bottom of the clarifier cone. 

Clarifier plate packs Clarifier plate packs Clarifier plate packs
clarifier plate pack
clarifier trough
clarifier overflow weir

Clarifier Flow

Clarifier Flow Diagram
Clarifier Flow Schematic

The flow of waste water into a clarifier starts at the top of the tank.  The flow then is fed via baffles to the bottom of the unit.  The flow then goes up through the plates, settling the solids and allowing the filtrate to flow out the top outlet and in most cases to a final pH adjust or back through the system for additional treatment.  This process is successful because it temporarily increases the flow between the plates and then immediately slows down allowing the solid particulate to accumulate and settle out as the flow exits the top of the plates and subsequently out of the top of the clarifier.

The solids gravity settle to the bottom of the clarifier and are then pumped via the automatic sludge blow-down system and diaphragm pump from the clarifier cone to a sludge thickening tank for additional settling.  From the sludge thickener, the sludge typically gets pumped through a filter press for final dewatering prior to disposal.

GPM
No. of
Packs
No. of
Cones
Projected
Settling Area
Weight in Lbs.
Operating - Dry
Dimmensions
L x W x H
2
1
1
13
3,000
1,200
4' x 3' x 6'
12
1
1
61
10,500
3,800
5' x 5' x 8'
15
1
1
89
12,00
4,200
6' x 6' x 9'
30
1
1
171
14,00
4,700
6'x 7' x 10'
60
2
1
342
38,00
7,500
8'x 11' x 10'
90
2
1
520
53,00
10,500
9'x 11' x 12'
120
4
2
685
81,300
15,00
14'x 12' x 12'
180
4
2
1041
110,000
18,300
18'x 12' x 12'
240
8
2
1388
125,000
21,900
24'x 10' x 12'
300
8
4
1475
140,00
25,000
27' x 11' x 12'

The above units are standard sizes.  Custom and larger clarifiers are available for design and purchase.

Additional information:

Clarifier Case Study: Chipping away at disposal costs: With Met-Chem’s system installation, the effluent (liquid from the clarifier, which is virtually free of solids) is then pumped back to the Digester tanks.  The settled solids from the cones of the clarifier are then filtered by a belt filter press and this dried cake, being a bio food waste, is hauled to the area farms to feed the cows.

Water Treatment Case Study: A Clean Lagoon is a Good Lagoon: Fiberboard Manufacturer's existing system could not handle the volume of paper pulp being generated.  They needed to clear out the sediment that was accumulating in their lagoon that were in violation of environmental regulations.

Waste Water Treatment Systems Case Study: Just to clarify…: A new boarding school needed to put in a self-contained sanitary waste treatment system to handle all water sources generated at their facility. Met-Chem designed and built two 120 GPM clarifiers with flocculation tanks, and custom catwalks built to fit space limitations and overlook and operate the waste treatment system. 

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