Coupled electron beam radiation and MBR treatment of textile wastewater containing polyvinyl alcohol.
Advanced oxidation processes (AOP) can be combined with biological treatments for recalcitrant organic pollutant decomposition. However, there has been no thorough investigation on the coupling of AOPs and membrane bioreactors (MBR) to treat polymer organic pollutants. This study proposes a new AOP that couples electron beam (EB) radiation and MBR treatment. This method was applied to treat real textile effluents containing polyvinyl alcohol (PVA). During the stable operation stage, 31 ± 7% (n = 28) COD was removed by the EB-MBR process. COD removal was enhanced to 45% at the end of the research period without process optimization. In addition, both the membrane flux and activated sludge system exhibited good stability. Only a 2% membrane flux decreased was observed after a 46 d operation period. PVA radiolysis and biofacies analysis mechanisms are also discussed. By contrast, PVA degradation using only the MBR treatment was ineffective in this study. This ineffectiveness was caused by membrane interception and floccule formation by PVA and activated sludge.
Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, PR China.
Weihua
W
Sun
Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, PR China.
Jun
J
Chen
School of Environment, Tsinghua University, Beijing 100084, PR China; Zhejiang Provincial Key Laboratory of Water Science and Technology, Zhejiang Province, Jiaxing 314006, PR China. Electronic address: chenlj@tsinghua.edu.cn.
Lujun
L
Chen
Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China.
Jianlong
J
Wang
Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, PR China.
Yongming
Y
Zhang
D019149:Bioreactors; D004583:Electrons; D007220:Industrial Waste / Q000032:analysis; D008567:Membranes, Artificial; D011142:Polyvinyl Alcohol / Q000737:chemistry* / Q000528:radiation effects*; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000032:analysis*
D007220:Industrial Waste; D008567:Membranes, Artificial; D011142:Polyvinyl Alcohol; D062065:Wastewater
Electron beam; Ionizing radiation; MBR; PVA; Textile wastewater