研究生论文摘要

亚硝酸型硝化的控制与反硝化除磷影响因子的研究研究生:陈鸣岐导师:任南琪(哈尔滨工业大学市政环境工程学院150090)反硝化除磷脱氮双泥工艺(Anaerobic-Anoxic/Nitrification,A2N)是以控制水体富营养化为目的的脱氮除磷新工艺,工艺中包括好氧SBR反应器和厌氧/缺氧SBR反应器。以模拟生活污水为处理对象,分别进行了厌氧/缺氧SBR间歇试验和好氧SBR的连续流试验,为下一阶段运行A2N动态试验提供运行参数的参考范围。在厌氧/缺氧SBR间歇试验中,采用厌氧/缺氧交替运行方式培养驯化反硝化聚磷污泥,结论如下:(1)当厌氧段的pH分别为8、7.5、7…     

Hypothesis for metabolites of denitrifying phosphate accumulating organisms by the restriction of denitrifying bacteria in anoxic phase

The objective of this work is to verify a hypothesis that nitrite accumulation comes from the metabolites of denitrification phosphate accumulating organisms (DPAOs),not denitrifying bacteria.On the precondition of the restriction of denitrifying bacteria in anoxic phase,static experimental test was designed using NO3-as electron acceptor,effluent was removed after sedimentation in anaerobic phase,and the same concentration solution of PO43--P was returned,so that TOC was excluded and denitrification was inhibited in the next phases.A parallel experiment was carried out simultaneously with the normal anaerobic-anoxic progress.The results showed that,in static test,by keeping the normal growth of DPAO and inhibiting denitrification of denitrifying bacteria,P-release in anaerobic and P-uptake in anoxic phase proceeded normally.DPAO had obvious effect on P-removal and the P-removal efficiency was 69%.The effluent concentration of NO3--N and NO2--N was 7.62 mg/L and 6.05 mg/L respectively,compared with parallel experiments,and nitrogen removal rate was lower.No nitrite residue was found in parallel test.Therefore,it can confirm the hypothesis that the metabolites of DPAO are both nitrogen and nitrite when nitrate is taken as electron acceptor,and nitrite is subsequently converted to nitrogen by denitrifying bacteria.