Sludge Filter Press

A sludge filter press pump is applied to feed the Treated Effluent from Flash mixer with solids & liquids through feed nozzle of the filter press to the chamber formed between the plates and the medium, leaving the solid trapped inside and the liquid drained out. Cake which is build in the hollow space between the plates will fall out once the pack is opened. Filter press is the most efficient and most employed in all filtering process.

Flocculation & Filteration

In the Electrocoagulation process, the Molecular Bonding of the Effluent breaks and the solids are separated and made to more stable form. After Electrocoagulation, An Anionic Poly Electrolyte is dosed from 0.5to 1 mg/L in the Flash Mixer. The Flocculation happens due to this and the bigger size flocs are formed for easier filtration. The Poly Electrolyte is dosed by the Dosing pump which is controlled as per the Flow rate of the Effluent. After the Flash mixer, the Filtration of the solids is done easily by Tube Settler or sludge filter press. The water becomes clear with out suspended solids and Turbidity after this filtration.

Filter Press

A High pressure diaphragm pump is applied to feed the concentrated sludge from high rate solid content clarifier with solids & liquids through feed nozzle of the filter press to the chamber formed between the plates and the medium, leaving the solid trapped inside and the liquid drained out. Cake which is built in the hollow space between the plates will fall out once the pack is opened. Filter press is the most efficient and most employed in all filtering process.

Main Use of Filter Press

• To get crystal clear water
• To Separate the sludge and water
• To make sludge as dry form
• To achieve the best results in DQO and DBO
• To remove the Suspended solids

Filter Press Process Description

A High pressure Diaphragm pump is applied to feed the concentrated sludge from high rate solid content clarifier with solids & liquids through feed nozzle of the sludge filter press to the chamber formed between the plates and the medium, leaving the solid trapped inside and the liquid drained out. Cake which is built in the hollow space between the plates will fall out once the pack is opened. Filter press is the most efficient and most employed in all filtering process.

Function: This is a three step process : sludge removal, dewatering and disposal.

Sludge is removed from the HRSCC system from the bottom of sludge recirculation pipe line.

1.Filter Plate; 2 End Plate; 3.Rails ; 4.Hytrolic Jack  5.Plunger; 6 Inlet Pipe; 7.Filterate Discharge Pipe 8.Work Bench

Operation and maintenance consideration 

• The operator must record it filter press operation time (starting and finishing time of each batch) and no of batches collection from filter press.
• The operators The desired quantity of polymer needs to be prepared 15-30 minutes before the dewatering operation .
• The operator After every dewatering operation ,the filter cloths must be thoroughly cleaned. So that clogging in the pores of the woven polypropylene filter fabric is avoided.
• The operator must clean Every three days once or Periodic cleaning of filter cloth with hydrochloric acid or hypo solution .
• The operator note When the filtration process becomes excessively slow ,it is time to replace the filter cloth with a fresh set.
• The operator always maintain stock list of filter cloth.
• The operator always operate filter press 180 to 260 bar respectively.
• When the outlet water quality is not good or high turbid content ,change the filter cloth or increases filtration pressure( 180 to 260 bar)

 Trouble shooting

s.no	Problem	Cause
1	Filter press does not dewater the slurry sufficiently	Poor maintenance of filter press
2	Dewatering is very slow	Oily /slimy sludge filter press cloth is clogged improper conditioning.
3	Insufficient pressure developed	Rubber stator of screw pump work out.   Steel rotor damaged.

The freshly produced cake has a moisture content of between 70-75% .note that it is impossible to achieve a bone –dry cake even after prolonged air-drying; the moisture content would not drop below 50 %.The liquid in the slurry can pass  through the cloth ,while the thickener  paste-like  sludge can not pass through the cloth.

 Maine use of Filter press

• To remove the moisture content in the final sludge
• To make sludge as dry form

 Lab tests:

Most of the tests are done in our own laboratory.

Main tests:

• Ph measurement by digital ph meter
• Tds measurement by digital tds meter
• Total solids determination –ts
• Total dissolved solids determination-tds
• Total suspended  solids determination -tss
• Determination of mlss in tss
• Total hardness
• Chemical oxygen demand-cod
• Biochemical oxygen demand-bod
• Dissolved oxygen-do
• Turbidity – nt