Sludge treatment and disposal: most of the suspended solids and some of the dissolved organic solids, in a converted form, are separated from the main flow of the, in the form of sludge. The quantity and the characteristics of sludge depend upon its origin. In general, the sludge contains 92-98% of moisture. The higher organic content of the sludge demands further treatment prior to its final disposal either on land or into the sea.
Sludge treatment process: sludge treatment may include all or a combination of the following unit operation and process-
(1) Thickening (2) digestion (3) conditioning (4) dewatering (5) incineration