Waste Water Activated Sludge Wastewater Treatment Plants Industrial Wastewater Treatment Water Treatment Wastewater Systems Waste Water : ADI Systems Inc ADI Systems Inc. - Waste Water Management Our wastewater treatment solutions have been provided to over twenty municipal wastewater treatment plants worldwide. Rotating biological contactors: small flow waste streams minimum operator attention reduced energy costs reduced Sludge disposal low annual maintenance above-ground tanks or underground basins limited space requirements