Long term performance of MBR for biological nitrogen removal from synthetic municipal wastewater
Long term performance of MBR for biological nitrogen removal from synthetic municipal wastewater
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DOI：
10.1016/j.chemosphere.2006.06.026
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发表时间：
2007-01-01
期刊：
影响因子：
8.8
通讯作者：
Yanful, Ernest K.
中科院分区：
文献类型：
--
作者：
Holakoo, Ladan;Nakhla, George;Yanful, Ernest K.
研究了膜生物反应器（MBR）在固体停留时间（SRT）为40和20 d时处理模拟城市污水的长期性能，重点研究了同步硝化反硝化（SND）。SND受运行溶解氧（DO）的影响较大。结果发现，在SRT为20天，氮去除通过同化成生物量增加，作为一个结果，更高的生物量产量。膜生物反应器中可溶性微生物产物（SMP）的分布符合一个周期性的模式，相对于SRT。SRT从40天减少到20天，导致在MBR中积累的SMP浓度加倍（至56毫克升（-1））。然而，这伴随着MW > 100 kD的SMP的百分比同时下降，从42.4%下降到33%。此外，污泥过滤性下降了24倍，尽管在生物质浓度的下降，在上述SRT的减少。研究发现，体积氧传递系数（K（1）a）是膜生物反应器中生物质浓度的函数，混合液中的氧传递系数与清水中的氧传递系数之比（α）为0.2-0.5。(c)2006爱思唯尔有限公司保留所有权利。
This study monitors the long term performance of membrane bioreactor (MBR) for the treatment of synthetic municipal wastewater at solid retention time (SRT) of 40 and 20 d with particular emphasis on simultaneous nitrification-denitrification (SND). SND was greatly influenced by the operating dissolved oxygen (DO). It was found that at an SRT of 20 d, nitrogen removal through assimilation into biomass increases as a result of higher biomass yield. The profile of soluble microbial products (SMP) conformed to a cyclical pattern in the MBR with respect to SRT. Decrease in SRT from 40 to 20 d resulted in doubling of accumulated SMP concentration (to 56 mg l(-1)) in the MBR. This however, was accompanied by a simultaneous drop in percentage of SMP with MW > 100 kD, from 42.4% to 33%. Also, the sludge filterability decreased by 24-folds despite a decrease in the biomass concentration, following the above reduction in SRT. It was found that the volumetric oxygen transfer coefficient (K(1)a) was a function of biomass concentration in MBR with the ratio of the oxygen transfer coefficient in mixed liquor to that of clean water (alpha) to be 0.2-0.5. (c) 2006 Elsevier Ltd. All rights reserved.