Formation of disinfection by-products during sodium hypochlorite cleaning of fouled membranes from membrane bioreactors

作     者：Hao Wang Defang Ma Weiye Shi Zhiyu Yang Yun Cai Baoyu Gao Hao Wang;Defang Ma;Weiye Shi;Zhiyu Yang;Yun Cai;Baoyu Gao

作者机构：Shandong Key Laboratory of Water Pollution Control and Resource ReuseSchool of Environmental Science and EngineeringShandong UniversityQingdao266237China No.1 Institute of Geology and Mineral Resources of Shandong ProvinceJinan250014China Shandong Engineering Laboratory for High-Grade Fe Ores Exploration and ExploitationJinan250014China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2021年第15卷第5期

页      面：271-281页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：the National Natural Science Foundation of China(Grant No.51808316) the Natural Science Foundation of Shandong Province(Grant No.ZR2019BEE015) 

主　　题：MBR Biofouling EPS Chemical cleaning DBPs CLSM 

摘      要：Periodic chemical cleaning with sodium hypochlorite(NaClO)is essential to restore the membrane permeability in a membrane bioreactor(MBR).However,the chlorination of membrane foulants results in the formation of disinfection by-products(DBPs),which will cause the deterioration of the MBR effluent and increase the antibiotic resistance in bacteria in the MBR *** this study,the formation of 14 DBPs during chemical cleaning offouled MBR membrane modules was *** with the effects of biofilm extracellular polymeric substances(EPS),influences of reaction time,NaClO dosage,initial pH,and cleaning temperature on the DBP formation were *** acids(HAAs)and trichloromethane(TCM),composed over 90%of the DBPs,were increasingly accumulated as the NaClO cleaning time *** increasing the chlorine dosage,temperature,and pH,the yield of TCM and dichloroacetic acid(DCAA)was increased by up to a factor of 1–14,whereas the yields of haloacetonitriles(HANs)and haloketones(HKs)were *** decreasing in the chlorine dosage and cleaning temperature or adjusting the pH of cleaning reagents toward acidic or alkaline could effectively reduce the toxic risks caused by *** the EPS extraction pretreatment,the formation of DBPs was accelerated in the first 12 h due to the damage of biofilm *** laser scanning microscopy(CLSM)images showed that EPS,particularly polysaccharides,were highly resistant to chlorine and might be able to protect the cells exposed to chlorination.