A network of lift stations and gravity collection systems carries effluent into the central pumping station at the plant site where the material is distributed through the treatment processes. Concentrated sewage that has settled out as sludge is collected and sent downstream from the pumps, pulled through a super shredder and ground up. This step prevents the pumps from clogging. The sludge is sent to the primary digester and then transferred to a heat exchanger, where hot water tubes treat the sludge. Before entering the heat exchanger, the sludge passes through another super shredder, effectively preventing residual debris from clogging the tubes.