共查询到16条相似文献,搜索用时 120 毫秒
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膜生物反应器(membrane bioreactor,MBR)作为一种高效的污水处理及回用工艺,近年来备受关注,然而MBR的膜污染问题严重制约了该工艺进一步快速的商业化推广.本文综述了污泥混合液各组分对MBR膜分离的影响,包括溶解性微生物代谢产物(soluble microbial product,SMP)、胞外聚合物(extracellular polymeric substances,EPS)、污泥浓度(mixed liquor suspended solids,MLSS)、颗粒粒径及无机物对膜污染影响,并对该领域未来的研究方向进行了论述. 相似文献
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PAC投加量对MBR混合液性质及膜污染的影响 总被引:2,自引:0,他引:2
比较了1g/L及2g/L的PAC投加量对膜生物反应器中混合液性质及膜污染速率的差异。发现两系统上清液COD差距不明显,说明1g/L的PAC投加量忆足以吸附小分子的有机物。当PAC从1g/L增至2g/L时,从微生物絮体中提取的多糖平均值分别为:14.92mg/gMLSS、15.38mg/gMLSS;蛋白质平均值分别为18.82mg/gMLSS、17.58mg/gMLSS;且膜丝内部累积的多糖和蛋白质含量基本相同。当PAC投加量为2g/L时,部分破碎的PAC颗粒会进入膜孔内部,引起不可逆污染。 相似文献
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膜生物反应器(membrane bioreactor,MBR)已成为一个十分有前景的废水处理工艺,该工艺具有出水水质好、占地面积小等优势.然而,由于微生物附着在膜表面而发生的生物污染现象,致使出水通量下降,限制了MBR的大规模推广应用.最近,一种新兴的、基于群体感应(quorum sensing,QS)的群体淬灭(quorum quenching,QQ)技术在延缓MBR膜污染领域的应用备受关注.QQ通过干扰群体感应系统而阻止其所依赖信号分子的基因表达,从而可有效抑制膜表面生物膜的形成.本文首先介绍了群体感应机理,并根据不同的群体淬灭物质,归纳总结了群体淬灭技术在延缓MBR膜污染的最新研究进展,最后对该领域的研究进行了展望. 相似文献
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本文针对了膜生物反应器(membrane bioreactor,MBR)污泥混合液在铁钙离子共存情况下对MBR运行的影响进行研究.实验结果表明:不同比例的铁钙离子共存时,COD、NH3-N、TP的去除率分别高达94%、98%、98%以上;进一步研究发现,对于调控MBR混合液存在最佳的铁钙离子比,当铁钙离子比为1∶3时,最大程度延缓了膜污染速率;钙离子的加入,MBR混合液中溶解性微生物产物(soluble microbial products,SMP)浓度降低明显,其中SMP中多聚糖含量与钙离子浓度密切相关;在铁钙离子共存体系,钙离子含量对松散结合态EPS(loosely bound EPS,LB)浓度影响较大,对紧密结合态EPS(tightly bound,TB)影响不显著. 相似文献
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《分离科学与技术》2012,47(10):1529-1536
Sludge properties, cake layer structure, and membrane fouling in a membrane bioreactor were studied under various hydraulic retention times (HRT). A decrease in HRT resulted in an increase in extracellular polymeric substance production in bulk sludge and changes in cake layer structure from gel layer to one or two cake layers. Particle size distribution in cake sludge changed with respect to HRT. An evolution in cake layer thickness and porosity was observed with trans-membrane pressure (TMP) jump. The change in cake layer structure might bear more responsibility for the TMP jump than the quantity of cake layer. 相似文献
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《分离科学与技术》2012,47(7):1279-1291
Abstract The long term sustainable flux behavior of a submerged membrane bioreactor operated under a steady state conditions at a range of mixed liquor suspended solids (MLSS) concentrations has been examined. Comparison of fouling rates at a number of imposed fluxes has been made between long term filtration trials and short term tests using the flux step method. Results indicate an exponential relationship between fouling rate and flux for both long and short term trials, although the value was an order of magnitude lower during long term tests. Moreover, operation during long term trials is characterised by a period of pseudo stable operation followed by a catastrophic rise in TMP at a given critical filtration time (tfilt) during trials at 6 g · L?1. This time of stable operation, tfilt, is characterised by a linear relationship between fouling rate and flux. Results have been compared with the literature. Data for membrane fouling prior to the end of tfilt yielded a poor fit with a recently proposed model. Trends recorded at t>tfilt revealed the fouling rate to follow no definable trend with flux, contrary to the notion that fouling beyond the critical filtration time relates to solids deposition. 相似文献
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