厌氧／缺氧SBR反硝化除磷效能的研究

采用厌氧 缺氧SBR反应器对以硝酸盐作为电子受体的反硝化除磷过程进行了研究。结果表明 ,反硝化聚磷菌完全可以在厌氧 缺氧交替运行条件下得到富集。稳定运行的厌氧 缺氧SBR反应器的反硝化除磷效率 >90 % ,出水磷浓度 <1mg L。进水COD浓度对反硝化除磷的效率影响很大 ,在COD浓度 <180mg L时 ,进水COD浓度越高 ,除磷效率也就越高。较高浓度的进水COD浓度将导致有剩余的COD进入缺氧段 ,对反硝化吸磷构成不利影响。污泥龄为 16d时 ,厌氧 缺氧SBR反应器取得稳定和理想的反硝化除磷效果。污泥龄减少到 8d ,由于反硝化聚磷菌的流失导致反硝化除磷效率的下降。当污泥龄恢复到 16d时 ,经过一段时间的运行 ,反硝化聚磷菌重新得到富集 ,除磷效率恢复到 90 %以上。

Denitrifying phosphorus removal by anaerobic/anoxic sequencing batch reactor

Denitrifying phosphorus removal was verified in a laboratory anaerobic/anoxic sequencing batch reactor (A/A SBR). The results obtained demonstrated that the ability of the anaerobic/anoxic strategy to enrich the growth of denitrifying phosphorus bacteria (DPB) capable of taking up phosphate under anoxic condition by using nitrate as the electron acceptor. The phosphorus removal efficiency was higher than 90% and the effluent phosphate concentration was lower than 1 mg/L after the A/A SBR operated in the steady state. When the influent COD was lower than 180 mg/L, the more COD in the influent was, the higher efficiency of phosphorus removal could be attained in anoxic condition. However, simultaneous presence of carbon and nitrate would be detrimental to denitrifying phosphorus removal. Result of influence of sludge retention time(SRT) on denitrifying phosphorus removal suggested that decrease of SRT caused a washout of DPB and consequently the enhanced biological phosphorus removal decreased with 8 days SRT. When the SRT was restored to 16 days, however, the efficiency of phosphorus removal of above 90% was attained.