Ng H Y, Tan T W, Ong S L, Toh C A, Loo Z P
Water and Biotreatment Group, Centre for Water Research, Division of Environmental Science and Engineering, National University of Singapore. Block EA, #07-23, 9 Engineering Drive 1, Singapore 117576.
Water Sci Technol. 2006;53(6):7-13. doi: 10.2166/wst.2006.162.
In this study, four similar bench-scale submerged Anoxic/Oxic Membrane Bioreactors (MBR) were used simultaneously to investigate the effects of solids retention time (SRT) on organic and nitrogen removal in MBR for treating domestic wastewater. COD removal efficiencies in all reactors were consistently above 94% under steady state conditions. Complete conversion of NH(4+)-N to NO(3-)-N was readily achieved over a feed NH(4+)-N concentration range of 30 to 50 mg/L. It was also observed that SRT did not significantly affect the nitrification in the MBR systems investigated. The average denitrification efficiencies for the 3, 5, 10 and 20 days SRT operations were 43.9, 32.6, 47.5 and 66.5%, respectively. In general, the average effluent nitrogen concentrations, which were mainly nitrate, were about 22.2, 27.6, 21.7 and 13.9 mg/L for the 3, 5, 10 and 20 days SRT systems, respectively. The rate of membrane fouling at 3 days SRT operation was more rapid than that observed at 5 days SRT. No fouling was noted in the 10 days and 20 days SRT systems during the entire period of study.
在本研究中，同时使用了四个相似的中试规模的淹没式缺氧/好氧膜生物反应器（MBR）来研究固体停留时间（SRT）对MBR处理生活污水中有机物和氮去除的影响。在稳态条件下，所有反应器的化学需氧量（COD）去除效率始终高于94%。在进水NH₄⁺-N浓度为30至50mg/L的范围内，NH₄⁺-N能很容易地完全转化为NO₃⁻-N。还观察到，SRT对所研究的MBR系统中的硝化作用没有显著影响。SRT为3天、5天、10天和20天的运行条件下，平均反硝化效率分别为43.9%、32.6%、47.5%和66.5%。一般来说，SRT为3天、5天、10天和20天的系统中，平均出水氮浓度（主要为硝酸盐）分别约为22.2mg/L、27.6mg/L、21.7mg/L和13.9mg/L。SRT为3天运行时的膜污染速率比SRT为5天时更快。在整个研究期间，SRT为10天和20天的系统中未观察到膜污染。
