SLAMAVATTNING MED KEMICOND® OCH HYDRAULISKA KOLVPRESSAR PÅ KÄPPALAVERKET / Sludge dewatering with Kemicond® and hydraulic filter presses at the Käppala WWTP
At the Käppala wastewater treatment plant (WWTP) in Stockholm, a novel approach for dewatering of sewage sludge has been developed. As in many wastewater treatment plants the dewatering is a costly part of the treatment process. The sludge produced at the plant must be hauled to be used on farmlands and dewatering greatly reduces the volumes and transportation costs. By combining a potent chemical conditioning of the sludge, the so-called Kemicond® process, with a powerful mechanical dewatering, the HPS 5007 Bucher hydraulic filter press, the old belt filter presses have been replaced and the total solids (TS) concentration increased from 19 % to 40 %. Moreover, the conditioning also functions as a potent pathogen control and reduces
foul smells such as ammonia and mercaptans. In this paper both full scale results as well as laboratory tests are presented and the economical aspects are discussed. See also Thunberg (2010a,b) for previous papers on the same issue.