序批式反应器中反硝化除磷脱氮的研究

为了提高污水脱氮除磷的效率,研究采用序批式反应器(SBR工艺)厌氧、好氧和缺氧(AOA)的运行方式富集反硝化聚磷菌(DPB),实现同步脱氮除磷。结果表明:在好氧段投加甲醇作为碳源(25—40 mg/L)可有效抑制好氧吸磷,对硝化反应影响较小,能够在缺氧段实现同时反硝化脱氮除磷。SBR反应器稳定运行10个月,当进水NH4+-N、PO43--P分别为30,15 mg/L时,总氮(TN)和PO43--P的平均去除率分别为82.5%和92.1%。聚磷菌能够利用硝酸盐作为电子受体,DPB占总聚磷菌的比例达到44.8%。与A2O运行方式相比,AOA运行方式更有利于实现DPB的富集。

Phosphorus and nitrogen removal by denitrifying in sequencing batch reactor

An anaerobic/aerobic/anoxic(AOA) operation process was employed to enrich denitrifying phosphorus-accumulating bacteria(DPB) and achieve the simultaneous phosphorus and nitrogen removal in sequencing batch reactor(SBR) in order to improve the removal efficiency of nitrogen and phosphorus in the sewage.The results show that aerobic phosphate uptake can be inhibited effectively,and nitrification reaction is hardly influenced when methanol is used as carbon source(25-40 mg/L) in the aerobic phase.Furthermore,denitrifying denitrification phosphorus-removal can be realized simultaneously in the next anoxic phase.After the SBR is operated stably for more than 10 months,the average removal efficiencies of total nitrogen and phosphorus are 82.5% and 92.1% when influent NH4+-N and PO43——P are 30 mg/L and 15 mg/L,respectively.Phosphate-accumulating organisms(PAOs) can utilize nitrite as an electron acceptor and the ratio of DPB in total PAOs is 44.8%.AOA operation process is more beneficial for accumulating DPB compared with A2O(anaerobic/anoxic/aerobic) operation process.