[1]杨应明,王旭东,刘玄宁,等.汲取液EDTA-2Na对正渗透MBR运行性能的影响[J].中国给水排水,2021,37(11):9-16.
　YANG Ying-ming,WANG Xu-dong,LIU Xuan-ning,et al.Effect of EDTA-2Na Draw Solute on Operating Performance of Forward Osmosis MBR[J].China Water & Wastewater,2021,37(11):9-16.
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汲取液EDTA-2Na对正渗透MBR运行性能的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷 期数: 2021年第11期 页码: 9-16 栏目: 出版日期: 2021-06-01
Title:
Effect of EDTA-2Na Draw Solute on Operating Performance of Forward Osmosis MBR
作者:
杨应明1,2,3，王旭东1,2,3，刘玄宁1,2,3，王磊1,2,3
(1.西安建筑科技大学环境与市政工程学院陕西省环境工程重点实验室，陕西西安710055；2.陕西省膜分离重点实验室，陕西西安710055；3.西北水资源与环境生态教育部重点实验室，陕西西安710055)
Author(s):
YANG Ying-ming1,2,3，WANG Xu-dong1,2,3，LIU Xuan-ning1,2,3，WANG Lei1,2,3
(1. Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. Shaanxi Key Laboratory of Membrane Separation Technology, Xi’an 710055, China; 3. Northwest China Key Laboratory of Water Resources and Environment Ecology, Xi’an 710055, China)
关键词:
正渗透; 膜生物反应器; EDTA-2Na; 膜污染
Keywords:
forward osmosis; membrane bioreactor; EDTA-2Na; membrane fouling
摘要:
采用乙二胺四乙酸二钠(EDTA-2Na)作为汲取液运行正渗透(FO)膜生物反应器(MBR)，并与NaCl汲取液进行比较，考察系统的运行效果、污泥性质以及膜污染状况。结果表明，与NaCl相比，采用EDTA-2Na作为汲取液能有效减轻生物反应器的盐分积累，并得到更高的水通量；采用两种汲取液时正渗透MBR对污染物的去除效果相当，与汲取液种类无关，正渗透MBR对TOC、TN、氨氮和TP的去除率分别可达到94.6%、71.7%、96.8%和99.2%以上；水通量的减小会导致MLSS和MLVSS的降低；采用EDTA-2Na作为汲取液时，生物反应器中升高的EDTA浓度导致胞外聚合物(EPS)浓度升高，加重了FO膜污染。FTIR、SEM和EDS分析结果表明，采用两种汲取液时，FO膜活性层表面都会覆盖一层滤饼层；以EDTA-2Na作为汲取液时，污染膜表面有机污染物较多、无机沉积物较少。
Abstract:
A forward osmosis (FO) membrane bioreactor (MBR) was operated by using ethylene-diamine-tetra acetic acid disodium salt (EDTA-2Na) as the draw solute, and its operating performance and membrane fouling were investigated and compared with another MBR with NaCl as the draw solute. Compared with NaCl, EDTA-2Na serving as the draw solute could effectively reduce the salt accumulation in the bioreactor and obtain a higher water flux. When the MBR was operated with two kinds of draw solute (EDTA-2Na and NaCl), the removal efficiency of pollutants was similar, which was independent of the type of draw solute. The removal rates of TOC, TN, ammonia nitrogen and TP by the forward osmosis MBR were 94.6%, 71.7%, 96.8% and 99.2%, respectively. The decrease of water flux would lead to the decrease of MLSS and MLVSS. When EDTA-2Na was used as the draw solute in the forward osmosis MBR, the increase of EDTA concentration in the bioreactor led to the increase of extracellular polymer (EPS) concentration, which aggravated the fouling of FO membrane. The results of FTIR, SEM and EDS showed that the active layer of the FO membranes was covered by a cake layer when the forward osmosis MBR was operated with two kinds of draw solute (EDTA-2Na and NaCl). There were more organic foulants and less inorganic precipitation on the polluted membrane surfaces of the forward osmosis MBR with EDTA-2Na as the draw solute.

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更新日期/Last Update: 2021-06-01