Membrane fouling is a major problem in membrane bioreactors(MBRs).In this study,membrane fouling caused by membrane rejection and adsorption was study.Filtration tests indicated that membrane rejected SMP,causing memb...Membrane fouling is a major problem in membrane bioreactors(MBRs).In this study,membrane fouling caused by membrane rejection and adsorption was study.Filtration tests indicated that membrane rejected SMP,causing membrane pore blockage and then forming a gel layer.Batch adsorption experiments showed that adsorption of SMP onto PVDF membrane was a spontaneous physical adsorption process.Meanwhile,the absolute valueΔG of adsorption of SMP onto D3520 was higher than that of adsorption of SMP onto PVDF membrane,so SMP preferentially adsorbed onto D3520 rather than PVDF membrane.Thus,the effect of ARs on reducing the SMP concentration was investigated.It was found that,6 g of D3520 was suitable for adsorption of SMP.This physical adsorption involved external film diffusion,intra-particle diffusion,and surface adsorption.The Redlich–Peterson isotherm model performed best in terms of describing this equilibrium data.The mechanism of membrane fouling mitigation was verified by MBR simulation system.A case study of AR–MBR system was conducted.The results showed that addition of D3520 can effectively alleviate the development of membrane fouling.展开更多
利用自行筛选的好氧反硝化菌(Pseudomonas sp.)添加到膜曝气生物反应器构建高效脱氮菌群增强膜曝气生物反应器来处理市政污水。研究表明,对于高效脱氮菌的附着下形成的增强型膜曝气生物反应器,在COD负荷为7.6 g COD·(m^2·d)^(...利用自行筛选的好氧反硝化菌(Pseudomonas sp.)添加到膜曝气生物反应器构建高效脱氮菌群增强膜曝气生物反应器来处理市政污水。研究表明,对于高效脱氮菌的附着下形成的增强型膜曝气生物反应器,在COD负荷为7.6 g COD·(m^2·d)^(-1),水力停留时间为5 h下,可使污染物的COD、氨氮及总氮的去除率分别保持在87%、98%和85%以上。总氮去除率比平行对比的传统型膜曝气生物反应器高出10%。DGGE分析显示,筛选菌种在增强型膜曝气生物反应器中比平行膜曝气生物反应器明显增多,从微观上证明了菌种发挥了重要作用。本工艺在生活污水脱氮处理方面有良好的应用前景。展开更多
基金financially supported by the Inner Mongolia Natural Science Foundation of China(No.2016BS0205)the Scientific Research Foundation of the Inner Mongolia University of Technology of China(No.ZD201505).
文摘Membrane fouling is a major problem in membrane bioreactors(MBRs).In this study,membrane fouling caused by membrane rejection and adsorption was study.Filtration tests indicated that membrane rejected SMP,causing membrane pore blockage and then forming a gel layer.Batch adsorption experiments showed that adsorption of SMP onto PVDF membrane was a spontaneous physical adsorption process.Meanwhile,the absolute valueΔG of adsorption of SMP onto D3520 was higher than that of adsorption of SMP onto PVDF membrane,so SMP preferentially adsorbed onto D3520 rather than PVDF membrane.Thus,the effect of ARs on reducing the SMP concentration was investigated.It was found that,6 g of D3520 was suitable for adsorption of SMP.This physical adsorption involved external film diffusion,intra-particle diffusion,and surface adsorption.The Redlich–Peterson isotherm model performed best in terms of describing this equilibrium data.The mechanism of membrane fouling mitigation was verified by MBR simulation system.A case study of AR–MBR system was conducted.The results showed that addition of D3520 can effectively alleviate the development of membrane fouling.
文摘利用自行筛选的好氧反硝化菌(Pseudomonas sp.)添加到膜曝气生物反应器构建高效脱氮菌群增强膜曝气生物反应器来处理市政污水。研究表明,对于高效脱氮菌的附着下形成的增强型膜曝气生物反应器,在COD负荷为7.6 g COD·(m^2·d)^(-1),水力停留时间为5 h下,可使污染物的COD、氨氮及总氮的去除率分别保持在87%、98%和85%以上。总氮去除率比平行对比的传统型膜曝气生物反应器高出10%。DGGE分析显示,筛选菌种在增强型膜曝气生物反应器中比平行膜曝气生物反应器明显增多,从微观上证明了菌种发挥了重要作用。本工艺在生活污水脱氮处理方面有良好的应用前景。
