Sludge refers to the residual, semi-solid material left from industrial wastewater or sewage treatment processes. It can also refer to the settled suspension obtained from conventional drinking water treatment. Currently being featured on a public water supply is receiving water to prevent spoilage and environmental laws to control effluent quality before release. Treatment needs to be broken so that water quality in the effluent standard. Thus resulting in sewage treatment plants growing from the past. And also resulted in sewage sludge increased as well.