Aquatic environment

Occurrence and removal of organic micropollutants in the treatment oflandfill leachate by combined anaerobic-membranebioreactor technology

XU Yiping , ZHOU Yiqi , WANG Donghong , CHEN Shaohua , LIU Junxin , WANG Zijian


Received January 03, 2008,Revised March 06, 2008, Accepted , Available online

Volume 20,2008,Pages 1281-1287

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Organic micropollutants, with high toxicity and environmental concern, are present in the landfill leachate at much lower levels than total organic constituents (chemical oxygen demand (COD), biochemical oxygen demand (BOD), or total organic carbon (TOC)), and few has been known for their behaviors in di erent treatment processes. In this study, occurrence and removal of 17 organochlorine pesticides (OCPs), 16 polycyclic aromatic hydrocarbons (PAHs), and technical 4-nonylphenol (4-NP) in landfill leachate in a combined anaerobic-membrane bioreactor (MBR) were investigated. Chemical analyses were performed in leachates sampled from di erent treatment processes, using solid-phase extraction and gas chromatography with electron capture detector and mass spectrometry. Concentrations of OCPs, PAHs, and 4-NP in the raw leachate were detected within the range from ND (not detected) to 595.2 ng/L, which were as low as only 10??7–10??5 percentage of TOC (at the concentration of 2,962 mg/L). The removal of 4-NP was mainly established in the MBR process, in agreement with removals of COD, BOD, and TOC. However, the removals of OCPs and PAHs were di erent, mainly achieved in the anaerobic process. High removal e ciencies of both total organic constituents and organic micropollutants could be achieved by the combined anaerobic-MBR technology. The removal e ciencies of total organic constituents were in the order of BOD (99%) > COD (89%) > TOC (87%), whereas the removal e ciencies of investigated organic micropollutants were as follows: OCPs (94%) > 4-NP (77%) > PAHs (59%).

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