序批式膜生物反应器同时脱氮除磷的比较研究

Comparisons of Simultaneous Phosphorus and Nitrogen Removal in Sequencing Batch Membrane Bioreactors

对比了厌氧-好氧(AO)及厌氧-缺氧-好氧(A2O)2种运行模式序批式膜生物反应器(SBMBR)对模拟生活污水同时脱氮除磷的性能.结果表明,2种运行模式的SBMBR对有机物及氨氮的去除率分别可保持在90%和95%以上.A2O MBR具有更强的释磷能力,其SPRR30(前30min比释磷速率)比AO MBR高出47.5%;但SPUR30(前30min比吸磷速率)却比AO MBR低,这是导致前者膜出水中TP值较后者高的原因之一.2个系统内污泥均有反硝化除磷能力,A2O MBR中DPAO(反硝化聚磷菌)的比例比AO MBR提高了57%;硝酸盐为电子受体时单位电子转移所吸收的磷,前者比后者高30%.这2个因素双重作用的结果导致了A2O MBR反硝化除磷能力的提高.A2O MBR系统曝气时间减半并没有加重膜污染,反而该系统的膜污染相对较轻.膜对有机物有较好的过滤截留作用,污泥沉降性能对SBMBR出水水质影响很小.

Two SBMBRs run in AO and A^2O mode were operated in parallel to compare their ability of simultaneous phosphorus and nitrogen removal. The results showed that the removals of COD and ammonium nitrogen were averaged over 90% and 95%, respectively.A^2O MBR has the stronger anaerobic phosphorus release ability; its SPRR30 outdoes 47.5 % compared to AO MBR. SPUR30 of A^2O MBR was lower which may attribute to the higher effluent TP content. The ratio of DPAO was enhanced 57% compared to AO MBR. And when nitrate as the only electron accepter, the phosphorus uptake mass with unit electron transfer was 30 % higher in A^2O MBR. This two factors lead to the stronger denitrifying phosphorus removal ability of A^2O MBR. Furthermore, the membrane fouling was mitigated in A^2O MBR though the aerobic time was half to that of AO MBR. The membrane filter function made SBMBR＇s effluent free of the sludge settlement ability.