Study On Treatment Of Low-strength Municipal Wastewater With Up-flow Anaerobic Sludge Blanket Reactor

With urbanization progress accelerating in our country , townish wastewater treatment became the focus of attention , an economic and proper technology for townish wastewater treatment needs to be studied no time to delay . This paper describes the mechanism of anaerobic microbe purifying wastewater ,and at the same time , pilot plant research was made to investigate the characters of UASB(up-flow anaerobic sludge blanket) dealing with low strength municipal wastewater at normal temperature . Result showed that the secondary start-up of UASB reactor even can be completed within ten days on condition that inoculation sludge was taken from the UASB reactor dealing with brewage wastewater , the COD was lowered from influent 146-442mg/L to effluent 60mg/L at 21-29 , and COD index can meet the priority standard (level B) of Discharge standard of pollutents for municipal wastewater treatment plant(GB18918-2002). result also demonstrated this kind of technology could not effectively remove NH3-N and TP , therefore , the following technology should be adopted according to the effluent final outlet .In this paper the following technology after UASB system was also discussed , artificial wetland is one of the most appropriate technologies . The new technology , which combines UASB and wetland , has the characters of low cost low energy demand and simply management, and suits our country townish wastewater treatment.