CAJ | 학술논문

溶液pH值不仅影响溶质的电荷等表面性质,同时也影响膜表面的特性,从而影响溶质与膜表面之间的相互作用和溶质在膜面的沉积量及膜通量.胞外多糖(Extracellular POlvsac-charides,EPS)是膜生物反应器(Membrane Bioreactor,MBR)中主要的膜污染物质之一,从实际MBR膜污染层中分离纯化得到的EPS,在EPS引起膜污染机理分析的基础上,以过滤阻力、EPS在膜表面沉积量及膜通量为评价指标,综合分析不同溶液pH对EPS污染特征的影响,可为揭示MBR中EPS膜污染的成因和机理以及污染膜的清洗提供参考.结果表明,MBR膜污染层EPS的膜污染过程较好地符合沉积阻力模型,EPS在膜表面的污染主要是EPS沉积引起的;EPS溶液的pH越高,其与膜之间的排斥力越大,沉积量越少,沉积阻力越小,膜通量越高.pH为7.0时,沉积阻力为3.34×10~(11) m~(-1),沉积量为1.25 g/m~2,初始相对膜通量为9.8%.
용액pH치불부영향용질적전하등표면성질,동시야영향막표면적특성,종이영향용질여막표면지간적상호작용화용질재막면적침적량급막통량.포외다당(Extracellular POlvsac-charides,EPS)시막생물반응기(Membrane Bioreactor,MBR)중주요적막오염물질지일,종실제MBR막오염층중분리순화득도적EPS,재EPS인기막오염궤리분석적기출상,이과려조력、EPS재막표면침적량급막통량위평개지표,종합분석불동용액pH대EPS오염특정적영향,가위게시MBR중EPS막오염적성인화궤리이급오염막적청세제공삼고.결과표명,MBR막오염층EPS적막오염과정교호지부합침적조력모형,EPS재막표면적오염주요시EPS침적인기적;EPS용액적pH월고,기여막지간적배척력월대,침적량월소,침적조력월소,막통량월고.pH위7.0시,침적조력위3.34×10~(11) m~(-1),침적량위1.25 g/m~2,초시상대막통량위9.8%.
Solution pH influences the surface charge and structure of solute as well as those of membrane, consequently heavily affects the interaction between solute and membrane, deposited amount of solute on membrane surface and membrane flux. Extracellular polysaccharides (EPS) are one of important foulants of membrane sur face in membrane bioreactor (MBR). EPS were obtained from membrane fouling layer of treating wastewater MBR. Based on the determination of membrane flux, filtration resistances and deposited amount of EPS on the membrane surface as well as the mechanism analysis of membrane fouling, the influence of solution pH on the PVDF membrane fouling of EPS obtained was investigated. The membrane fouling caused by EPS in MBR fol-lows the model of deposition resistance. EPS deposition on membrane surface leads to membrane fouling. As pH of EPS solution increases, the repulsion between EPS and membrane surface goes up, depositing resistance of filtration goes down and deposited amount of EPS increases. When pH is 7.0, deposited resistance of filtration,deposited amount of EPS and flux are 3.34 × 10~(11) m~(-1), 1.25 g/m~2 and 9.8% , respectively.