Index >> Waste Water Microbiology >> Sludge Dewatering

In addition to dewatering by drainage evaporation occurs at the surface under the action of wind and sun. Cracking of dried sludge provides further surface for evaporation. Dried sludge are removed either manually or mechanically. Deep drying beds can also be used but they have the disadvantage of prolonged drying period.

Pressure filtration: This is a type of batch process which has metal chambers lined with filter material like filter doth. The metal back of chambers has grooves. Conditioned sludge is pumped into the chambers at a pressure of about 600-850 KPa.

At this pressure solids are retained adjacent to the cloth while the liquid drains via the grooves and drawn out at the bottom. Compressed sludge further acts as filter for incoming sludge