Sometimes when we work with complicated sludge or when we do not know the dryness that we are going to obtain with a sludge dewatering by means of a filter press, it is the moment to carry out a test to confirm the performance to be obtained. (Cake dryness).
In this WWTP, due to the high loads discharged by the factory, there is a high production of sludge in the biological treatment. In order to manage this sludge more economically, they are considering dewatering the sludge at the outlet of the biological treatment with a filter press.
You could watch the video here where we show you the whole development of a biological sludge pressing trial with a filter press in a plant.
1. We do a Jar-Test to check the amount of flocculant required for the press.
2. Add the flocculant to the flocculation tank.
3. The Filter Press will evacuate a large amount of water at the beginning of the process.
4. With a good conditioning of the sludge we will obtain a good permeate.
5. Once we reach the necessary pressure we open the filter.
6. Once the pressing is finished, we check that the dryness obtained is 25%.
Once the results have been analysed, the engineering company that manages the plant is considering installing a filter press to dehydrate the biological sludge.