The Waste Water Treatment Plant (WWTP) at Sewon Bantul, produces sludge as the by-pro-duct. The sludge is usually dried in the sludge drying bed and onlyasmall part of it is used as fertilizer. Each year the sludge can be yielded as much as 3300 m3 and may have negative im-pact i.e. supporting the existence of disease insect vector and other annoying animals. One effort for utilizing the sludge…