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《中南大学学报(英文版)》 2015-10
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Comparison of heavy metal removal efficiencies in four activated sludge processes

YANG Jun;GAO Ding;CHEN Tong-bin;LEI Mei;ZHENG Guo-di;ZHOU Xiao-yong;Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences;  
The removal efficiencies of heavy metals(As, Cr, Cu, Ni, Pb and Zn) were investigated in the 17 operating municipal wastewater treatment plants(WWTPs) and compared with those in four main activated sludge processes. Significant differences of heavy metal removal efficiencies were observed among four activated sludge processes. The removal efficiency for As(75.5%) in the oxidation ditch(OD) process is significantly higher than that in the conventional activated sludge(CAS) process(38.6%) or sequencing batch reactor(SBR) process(51.4%). The mean removal efficiencies for Cu and Ni in the OD process are 90.5% and 46.7%, respectively, while low mean removal efficiencies are observed for Cu(69.9%) and Ni(16.5%), respectively, in the SBR process. The removal efficiencies for Cu and Ni in the OD process are significantly higher than those in the anaerobic-anoxic-oxic(A2-O) process. These results highlight the differences of removal efficiencies for heavy metals in different processes and should be considered when selecting a wastewater treatment process.
【Fund】: Project(2012AA06A202)supported by Hi-tech Research and Development Project of China
【CateGory Index】: X703.1
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