膜序批式生物反应器(MSBR)脱氮除磷性能研究

Study on Performance of Nitrogen and Phosphorus Removal by Using Membrane Sequencing Batch Bioreactor

[目的]研究膜序批式反应器系统(MSBR)对城市生活污水的脱氮除磷性能。[方法]采用厌氧-好氧-缺氧+膜出水的运行方式(AOA-MSBR),考察MSBR系统对生活污水的脱氮除磷性能去除效果,并分析氮磷的去除机理。[结果]在水力停留时间为11h,污泥浓度为4000～5000mg/L的条件下,通过AOA-MSBR运行方式可实现高效脱氮除磷功能,对COD,氨氮、总氮、总磷平均去除率分别达到95%、97%、89%和90%,且系统具有较强的抗冲击负荷能力。MSBR系统存在同步硝化反硝化和反硝化除磷现象,分别占总氮和总磷的总去除率的15.5%和16.5%。[结论]在厌氧一好氧一缺氧的环境下,MSBR系统具备很好的硝化和反硝化条件,有利于氮磷的去除,同时系统存在同步硝化反硝化和反硝化除磷现象,增强了对氮磷的去除能力。

[ Objective] The study aimed to investigate the performance of membrane sequencing batch bioreactor（MSBR） on the removal of nitrogen and phosphorus in municipal domestic sewage. [ Method ] The operation mode of anaerobie-oxie-anoxie-membrane effluent water （AOA-MSBR） was used to investigate the effect of MSBR system on the removal of nitrogen and phosphorus in municipal domestic sewage. [ Result ] Under the conditions of hydraulic retention time （HRT） of 11 h, sludge eoncn, of 4 000 - 5 000 mg/L, the high effective removals of nitrogen and phosphorus were achieved through AOA-MSBR operation mode, with the removal efficiencies of COD, ammonian, total nitrogen and total phosphorus up to 95%, 97%, 89% and 90% ,resp. and the MSBR system had stronger ability of resistance to impact load. the MS- BR system existed the simultaneous nitrification denitrification and denitrifying phosphorus removal, accounting for 15.5% and 16.5% of total removal rate of total nitrogen and total phosphorus. [ Conclusion] In the environment of anaerobic-oxic-anoxic, the MSBR system showed the good condition of nitration and denitrification, which was propitious to the removal of nitrogen and phosphorus and it also had the simultaneous nitrification denitrification and denitrifying phosphorus removal, which strengthened the removal ability on nitrogen and phosphorus. Key words