How to do a Filter press pilot test at plant?

Sometimes, when we work with difficult sludge or when we are unsure of the degree of dryness that we will obtain during sludge dehydration using a filter press, it is helpful to perform a test to confirm the expected performance (the dryness of the cake).

Due to the high loads discharged by the factory, there are high levels of sludge production in the biological treatment at the plant. In order to manage this sludge outflow more economically, the factory is considering dehydrating the sludge at the biological treatment outlet using a filter press.

This video presents the process for performing a biological sludge pressing test using a filter press at the plant.

1. We carry out a jar test to check the amount of flocculant required for pressing.

2. We add the flocculant to the flocculation tank.

3. At the start of the process, the filter will drain off a large amount of water.

4. Effective preparation of the sludge will allow good permeation.

5. Once the required pressure is reached, we open the filter.

6. When the pressing is complete, the dryness obtained is shown to be 25%.


After analysing the results, the engineering company that manages the plant is assessing whether or not to install a filter press to dehydrate the biological sludge.

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