聚偏氟乙烯/氧化石墨烯复合微滤膜的在MBR中的抗污染性能研究
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- 英文论文题名：Effects of graphene oxide on antifouling performance of polyvinylidene fluoride microfiltration membranes in membrane bioreactor(MBR)
- 论文作者：赵传起 ; 杨悦锁 ; 张国权 ; 徐晓晨 ; 杨凤林
- 英文论文作者：Chuanqi Zhao ; Yuesuo Yang ; Guoquan Zhang ; Xiaochen Xu ; Fenglin Yang ; Key Lab of Eco-restoration of Regional Contaminated Environment ; Ministry of Education ; Shenyang University ; Key Lab of Industrial Ecology and Environmental Engineering ; Ministry of Education ; School of Environmental Science and Technology ; Dalian University of Technology
- 年：2016
- 作者机构：沈阳大学区域污染环境生态修复教育部重点实验室;大连理工大学工业生态与环境工程教育部重点实验室;
- 论文关键词：MBR ; 氧化石墨烯 ; 亲水改性 ; 膜污染
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X703;TQ051.893
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：186k
- 原文格式：D
- 会议级别：全国
摘要
在本实验中,利用强亲水性氧化石墨烯(GO)作为添加剂,自制了PVDF/GO复合微滤膜,并将其应用于MBR系统中,进行长期应用研究,通过与PVDF膜性能进行对比。研究发现,由于加入了亲水性的氧化石墨烯,复合膜的表面性质得到改善,其表面亲水的含氧基团覆盖率达到29.33%(GO=3 wt%),膜改性效果显著;PVDF/GO复合膜与PVDF膜对于污染物的去除效果相近,复合膜(GO=3 wt%)在80 d的实验过程中,仅进行了一次清洗,清洗周期是PVDF的4倍;PVDF/GO复合膜的膜阻力要低于PVDF膜,并且改性复合膜由于膜孔堵塞等造成的不可逆污染阻力显著下降,其数值仅仅是PVDF膜的9.0%(GO=3 wt%);EPS分析发现,复合膜表面的EPS浓度明显减少,其降幅分别达到59.98%(GO=1 wt%)和69.57%(GO=3 wt%),抗污染性能显著提高;通过SEM与CLSM分析发现,随着氧化石墨烯加入量的提高,复合膜表面形成了滤饼层变得疏松,厚度也变薄,甚至露出了部分膜表面(GO=3 wt%),保证了复合膜稳定的渗透率。
The self-prepared polyvinylidene fluoride(PVDF) composite membranes blending with different graphene oxide(GO) content were successfully used in a long term membrane bioreactor system(MBRs).Comparing with a control PVDF membrane,the critical flux,MBR performance,membrane resistance,and anti-fouling properties were intensively studied.The PVDF/GO membrane demonstrated higher critical flux and sustained permeability,lower cleaning frequency and durable filtration time.The scanning electron microscopy(SEM) and confocal laser scanning microscope(CLSM) images showed that the cake layer on composite membrane became looser and thinner with the increase of GO content.In terms of anti-EPS accumulation,the PVDF/GO composite membranes showed lower membrane resistance,particularly,lower pore plugging resistance than the PVDF membrane.Fewer amounts of EPS accumulated on the composite membrane surface due to the introduction of GO nanosheets.Consequently,part of membrane surface was exposed,resulting in the maintenance of high permeability over a long period of time.
The self-prepared polyvinylidene fluoride(PVDF) composite membranes blending with different graphene oxide(GO) content were successfully used in a long term membrane bioreactor system(MBRs).Comparing with a control PVDF membrane,the critical flux,MBR performance,membrane resistance,and anti-fouling properties were intensively studied.The PVDF/GO membrane demonstrated higher critical flux and sustained permeability,lower cleaning frequency and durable filtration time.The scanning electron microscopy(SEM) and confocal laser scanning microscope(CLSM) images showed that the cake layer on composite membrane became looser and thinner with the increase of GO content.In terms of anti-EPS accumulation,the PVDF/GO composite membranes showed lower membrane resistance,particularly,lower pore plugging resistance than the PVDF membrane.Fewer amounts of EPS accumulated on the composite membrane surface due to the introduction of GO nanosheets.Consequently,part of membrane surface was exposed,resulting in the maintenance of high permeability over a long period of time.
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