【摘要】 研究了浸没式膜生物反应器(sMBR)中生物质的增殖过程及其对反应器运行效能的影响.采用可编程逻辑控制器(PLC)对sMBR实现过程控制,在不排泥的情况下运行20-40d,生物质浓度达到9670mg/L,出水的各项指标达到最佳,但随着生物质的继续增殖,污泥表观黏度急剧增加,引起F/M的降低和传质困难,最终导致污泥活性降低及出水效果恶化.表观黏度与MLSS、EPS的增长趋势一致,表明这2个因素与活性污泥的表观黏度有着密切关系.采用SEM/EDS方法对不同阶段膜表面进行了观察及表面元素分析,结果表明膜表层污染物中有机物占主要部分,无机成分所占比例较小.更多还原

【Abstract】 The present work focused on investigating the proliferation of biomass in a submerged membrane bioreactor(sMBR) and its influence on the performance of this reactor.A programmable logic controller(PLC) was used to control the process of the sMBR.After operating for 20-40d with no discharge of sludge,the concentration of biomass attained 9670mg/L,every indexes in the effluent achieved the optimal effect.However,as the proliferation of biomass,the apparent viscosity of sludge increased markedly,which led to decreasing of the F/M and difficulty in mass transfer,and inhibited the activity of sludge as well as deteriorated the quality of effluent.Results also indicated that the increasing trend between the apparent viscosity and MLSS,EPS were rather similar,which revealed that these two factors had a close relationship with the apparent viscosity of sludge.Additionally,a SEM/EDS method was used to observe the morphology of the membrane surface and analyze the elemental composition,the results indicated organic pollutants were the main components in the fouling layer of the membrane modules,and the inorganic components accounted for a less ratio.更多还原