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首页> 外文会议>Membrane technology 2008 >INFLUENCE OF LOADING PATTERNS ON SLUDGE PROPERTIES ANDMEMBRANE FOULING IN MEMBRANE BIOREACTORS TREATING SYNTHETICEARLY PLANETARY BASE WASTEWATER
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INFLUENCE OF LOADING PATTERNS ON SLUDGE PROPERTIES ANDMEMBRANE FOULING IN MEMBRANE BIOREACTORS TREATING SYNTHETICEARLY PLANETARY BASE WASTEWATER

机译：负载模式对膜式生物反应器处理合成纤维素基废水中污泥性质和膜污损的影响

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摘要

This research studied the influence of membrane bioreactor (MBR) loading/decantingrnpatterns on sludge properties and membrane fouling. Two MBRs, one with continuousrnloading/decanting (cMBR) and the other with batch loading/decanting (bMBR), werernsetup and operated in parallel treating synthetic Early Planetary Base Wastewater (EPBW)rnand generate sludge mixed liquor that was used in batch filtration tests to characterizernmembrane fouling. During the MBR operation, the concentration of extracellularrnpolymeric substances (EPS), floc size distribution, viscosity, and zeta potential of thernsludge mixed liquor in the two MBRs were compared. The results showed that the bMBRrngenerated sludge with lower EPS concentrations, larger flocs, lower viscosity, and lowerrnzeta potential as compared to the cMBR, suggesting bMBR sludge could result inrnreduced membrane fouling. The sludge mixed liquor in the two MBRs were used forrnboth cross flow filtration with constant transmembrane pressure and submerged filtrationrnwith constant transmembrane flux. Microfiltration (MF) membranes and ultrafiltrationrn(UF) membranes were used in all the filtration tests. Consistent with the sludge propertyrnresults, both cross flow and submerged filtrations suggested that sludge mixed liquor inrnthe bMBR resulted in lesser membrane fouling. Analysis of the microbial communities inrnthe planktonic and the corresponding sessile biomass on the MF membranes after crossrnflow filtrations suggested that the microbial community of the planktonic biomass wasrnsignificantly different from that of the sessile biomass. This study showed that membranernfouling could be reduced by designing MBRs with more appropriate loading/decantingrnpatterns. Future research on biofouling mechanisms should include the function ofrnparticular bacterial population in biofilm initiation.
机译：这项研究研究了膜生物反应器（MBR）加载/倾析模式对污泥特性和膜污染的影响。设置了两个MBR，一个具有连续装卸/倾析（cMBR），另一个具有批量装填/倾析（bMBR），并与合成的早期行星基础废水（EPBW）并行处理，并产生污泥混合液，用于分批过滤测试以表征膜结垢。在MBR操作过程中，比较了两种MBR中污泥混合液的细胞外聚合物质（EPS）的浓度，絮状物尺寸分布，粘度和Zeta电位。结果表明，与cMBR相比，bMBR生成的污泥具有较低的EPS浓度，较大的絮凝物，较低的粘度和更低的zeta电位，表明bMBR污泥可导致减少的膜污染。两个MBRs中的污泥混合液用于具有恒定跨膜压力的错流过滤和具有恒定跨膜通量的浸没过滤。在所有过滤测试中均使用微滤（MF）膜和超滤膜（UF）膜。与污泥特性结果一致，错流和浸没式过滤均表明，污泥混合液在bMBR中的污染程度较小。错流过滤后，MF膜中浮游生物的微生物群落和相应的无柄生物量的分析表明，浮游生物量的微生物群落与无柄生物量有显着差异。这项研究表明，通过设计具有更合适的加载/倾析模式的MBR可以减少膜污染。未来关于生物污染机制的研究应包括特定细菌种群在生物膜启动中的功能。

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