SLUDGE DEWATERING - SNF Group

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frame filter press dewatering
S L U D G E D E W A T E
6Frame 6 filter press dewatering
Frame filter presses will dewater sludge at a higher level of dryness than the previous techniques
reviewed above. It is a discontinuous process that works in batch cycles.
6.1. Equipment description and
operating principle:
With a frame filter press, also called a filter press, the operating principle is filtration.
A filter press is composed of a series of hollow vertical frames with filter cloths stretched on
both sides. These frames are hung next to each other and pressed together with a hydraulic
jack. A filter chamber is formed bewteen the plates.
Each cycle can be split into three phases:
Filling phase: At the start of the cycle, the conditioned sludge is injected in the filtration
chambers by a high-pressure pump. The sludge fills each chamber and the water starts to
seep out.
4
2
1
3
1 Vertical hollow plates
2 Filter cloth
3 Jack
4 Filtration chamber