摘要
以聚丙烯无纺布为膜组件,向浸渍式膜生物反应器（MBR）中分别投加硬/软质悬浮填料处理人工废水。分析测定EPS、SVI、膜污染阻力及跨膜压力的变化,采用统计分析方法研究了软/硬质悬浮填料对MBR中EPS及SVI的影响;通过扫描电镜（SEM）分析,表征添加软/硬质悬浮填料膜表面的污染状况。结果表明,添加软/硬质悬浮填料膜组件表面滤饼中的溶解性EPSS和结合性EPSB与膜污染阻力的皮尔逊相关系数（rP）分别为0.929-0.984和0.798-0.853,EPSS与膜污染阻力之间表现出更强的相关性,EPSS对膜污染阻力的贡献大于EPSB。添加软/硬质悬浮填料MBR污泥混合液的EPS与SVI的皮尔逊系数（rP）分别为0.895和0.798,呈现明显的正相关性。SEM分析也表明,添加软质填料的膜表面污泥覆盖程度大于硬质填料的膜表面,但膜内部的污泥沉积量明显低于硬质填料。与软质悬浮填料相比,硬质悬浮填料能导致MBR污泥混合液的SVI和EPS含量增大,增加膜污染速率和不可逆膜污染阻力,软质悬浮填料具有更好的控制膜不可逆污染的效能。
The paper is inclined to make an analysis and investigation of the impacts of the soft/hard cartridges on the extracellular polymeric substance（EPS） and the sludge volume index（SVI）.It has also used the polypropylene non-woven fabric for membrane model,to analyze and test the membrane fouling resistance and the transmembrane pressure trend in treating the comprehensive sewage by adding hard/soft cartridges to the MBR.While studying the impact of soft/hard suspending cartridges on the EPS and SVI in MBR,we have done a statistical analysis in hoping to find the effect of the fouling status quo on the membrane surface with soft/hard suspending cartridges characterized via the electronic microscopy scanning（EMS）.The results of our study have shown that the Pearson correlation coefficient（rp） between the soluble EPS（EPSS） /bound EPS（EPSB） in the case on the membrane model surface with the soft/hard suspending cartridges and the fouling resistance tends to be equal to 0.929-0.984 and 0,798-0.853,respectively,thus,implying that there exists a close correlation between EPSS and the membrane fouling resistance whereas the EPSS tends to have a greater contribution to the membrane fouling resistance than that by EPSB.The Pearson correlation coefficient（rp）between EPS and SVI in MBR sludge mixed liquor with the suspending soft/hard cartridges has been found equal to 0.895 and 0.798,respectively,indicating an obvious positive correlation.The analysis of SEM also proves thal the sludge coverage degree on the membrane surface with the soft filler cartridges tends to be greater than that on the membrane surface with the hard cartridges,though the sludge deposit inside the membrane with the soft cartridges can be much lower than the amount inside the membrane with hard cartridges.Thus,as compared with the soft suspending cartridges,the hard ones can result in the increase of SVI and EPS in MBR sludge mixed liquor,which also tends to increase the membrane fouling rate and irreversible fouling resistance
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第6期255-259,共5页
Journal of Safety and Environment
基金
国家自然科学基金项目(21477001)
辽宁省教育厅科学研究一般项目(12013509)
关键词
环境工程学
悬浮填料
膜生物反应器
胞外聚合物
统计分析
environmental engineering
suspending cartridges
membrane bioreactor（MBR）
extracellular polymeric substances（EPS）
statistic analysis
