Energy efficient technology of municipal raw and active sludge processing

Abstract

А technology of anaerobic treatment of raw and active sludge with biogas production based on research work is developed. It includes preliminary enzymatic treatment of mix of sludges with combine of preacidification stage at 50 °C with gravity separation of suspension on clarified liquid and concentrate of suspended solids. Clarified liquid goes to anaerobic digestion with biogas production to UABS-reactor, and concentrate enters methane tank. Effectiveness of technological processes is confirmed by experimental data. The developed technology provides intensification of biogas production and reduction in capital costs due to processing of 60-70% from total volume of sludge mix in high effective UASB-reactor.