sludge digesters filtration SLUDGE ADI Systems has a vast experience with wastewater treatment plants servicing the industries and municipalities, aerobic and anaerobic treatment, SBR, activated sludge digesters, rotating biological contactors, covers and liners and toxic sludge dewatering processes. ADi Systems offers a range of water and wastewater solutions focusing on transforming organic, nonhazardous residuals during the water and wastewater treatment process control, which includes the treatment and conversion of sewage sludge into activated sludge.