Comparative Study of Dewatering Technologies for Sewage Sludge

Today, the treatment of water is a well-known process and is executed by state of the art techniques. The sludge resulting from this process represents the next challenge for the water treatment industry, in particular the minimizing of its volume. Now a days land is a premium and the use of open air drying might be offensive, are prime reason for the use of dewatering. The quantity of treated sewage as well as the level of their treatment results in the increasing amount of sewage sludge. Sewage sludge from water purification stations is difficult to handle. Sludge dewatering is a physical unit operation used to reduce the moisture content of the sludge and biosolids. Sludge dewatering reduce the transportation cost by reducing the volume of dewatering, easy to handle, increase the calorific value so that sludge dewatering is required. There are different types of sludge dewatering techniques but main aim of the paper is techno-economical comparison of belt filter press and centrifuge.