Impact of ambient conditions on SMP elimination and rejection in MBRs
Impact of ambient conditions on SMP elimination and rejection in MBRs
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DOI：
10.1016/j.watres.2007.05.046
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发表时间：
2007-09-01
期刊：
影响因子：
12.8
通讯作者：
Kraume, Matthias
中科院分区：
文献类型：
--
作者：
Drews, Anja;Mante, Jan;Kraume, Matthias
膜污染问题制约了膜辅助活性污泥法的广泛应用，增加了投资和运行成本。膜生物反应器（MBR）中的可溶性微生物产物（SMPs）是造成膜污染的主要原因。本研究的目的是阐明和量化不同的环境条件对SMP消除和拒绝的基础上，在试点MBR和明确的实验室试验的结果的影响。有几个因素被认为会影响SMP的浓度和它们的结垢倾向，但结果往往是不一致的，甚至是矛盾的。在这里，发现SMP负载率对SMP消除具有最大影响，从而对MBR中的浓度具有最大影响。在非常低的溶解氧和低硝酸盐浓度的消除程度下降。在中试和实验室试验中，平均75%的进水SMP被去除，多糖（PS）的去除率大多在80%以上。所用膜（PAN，37 nm）对SMP组分的截留率主要为20%至70%（蛋白质）和75%至100%（PS）。特别是蛋白质截留率下降，在较高的温度和较高的硝化活性。因此，在较低温度下增加的结垢速率可以部分地由这种增加的排斥来解释。显然，主要是亚硝酸盐氧化社区负责形成较小的SMP分子，可以通过膜。(c)2007爱思唯尔有限公司保留所有权利。
The widespread application of the membrane-assisted activated sludge process is restricted by membrane fouling, which increases investment and operating costs. Soluble microbial products (SMPs) are currently considered as the major cause of membrane fouling in membrane bioreactors (MBRs). This study aims at elucidating and quantifying the effects of varying environmental conditions on SMP elimination and rejection based on findings in a pilot MBR and in well-defined lab trials. Several factors are thought to influence the concentration of SMP and their fouling propensity in one way or the other, but findings are often inconsistent or even contradictory. Here, SMP loading rate was found to have the greatest effect on SMP elimination and thus on concentration in the MBR. The degree of elimination decreased at very low DO and low nitrate concentrations. On average, 75% of influent SMP were eliminated in both pilot and lab trials, with the elimination of polysaccharides (PS) mostly above 80%. Rejection of SMP components by the used membrane (PAN, 37 nm) ranged mainly from 20% to 70% for proteins and from 75% to 100% for PS. Especially protein rejection decreased at higher temperatures and higher nitrification activity. The increased fouling rates at lower temperatures might therefore partly be explained by this increased rejection. Apparently, mainly the nitrite-oxidising community is responsible for the formation for smaller SMP molecules that can pass the membrane. (c) 2007 Elsevier Ltd. All rights reserved.