Experimental Research on Treatment of Housing Estate Wastewater by Non-Residual Sludge Hydrolytic Acidification Process

With the increasing of the sewage delivery of housing estate, the quantity of residual sludge was increasing at the same time. The proportion of investment and operation cost used for treatment of residual sludge was higher in total cost. That brought many difficulties in treatment of housing estate sewage. In this paper, the non-residual sludge hydrolytic acidification process was taken to treat housing estate sewage. This internal cycle system was composed of medium-temperature anaerobic acidification reactor, hydrolytic acidification tank and contacting oxidation tank. Aerobic and anaerobic microorganism died and can be degraded continuously through a variable anaerobic-aerobic process. In this way, residual sludge produced in aerobic process could be digested thoroughly. Test showed that operation of acidification reactor had better effect under condition of temperature 34 degrees C, HRT 1.5 day, PH 5.5~6.0 and residual sludge can be decreased or zero emission. In this paper design and effective control of acidification reactor are also discussed.