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《Acta Scientiae Circumstantiae》 2012-07
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Characteristics of nitrogen and phosphorus removal by using two granular sludge process in sequencing batch reactors

LIU Xu,WANG Shuying*,PENG Yongzhen,WU Lei,ZHU Yunpeng School of Environment and Energy Engineering,Beijing University of Technology,Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering,Beijing 100124  
By using synthetic wastewater,the characteristics of denitrifying phosphorus removal process in a lab-scale two-sludge anaerobic/anoxic/nitrification SBR(A2NSBR) aerobic granular system was studied.The result showed that the two-sludge system ensured the denitrifying and dephosphorus bacteria to grow at their optimal states,which was favorable for the stability of nitrogen and phosphorus removal efficiency.When the influent COD was controlled at 300 mg · L-1,the COD removal efficiency was 78.8%.Most of the COD was stored as PHA in polyphosphate accumulating organisms(PAOs).When DO was controlled at 3.55~4.90 mg · L-1 and 5.6~6.6 mg · L-1 in nitrification SBR,the NH+4-N removal efficiency reached 87.0% and 94.5%,respectively.It was also demonstrated that the removal efficiency of phosphorus was only 72% when there was only settled anoxic phase in A/A/O SBR,while it increased to 85% when post-aeration stage was added.Most of the NO-x-N(NO-2-N+ NO-3-N) reduction occurred in the anoxic phase,during which NO-x-N was electron acceptors and PHA was electron donors.On average NO-x removal efficiency was 90.6%.
【Fund】: 国家自然科学基金(No.50808004);; 北京市教委科技创新平台项目~~
【CateGory Index】: X703
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