Flocculation pretreatment of landfill leachate for organic contaminants removal
Emerging organic contaminants in landfill leachate are causing environmental concerns. The most popular biological treatment is mostly the secondary stage in combination with additional physical-chemical pre-treatment process. Current pre-treatment technologis are limited by high operating costs, low treatment efficiencies, or sensitive operating conditions. In this paper, organic pollutants is removed from landfill leachate with a novel inorganic polymer flocculants, poly-ferric(III)-magnesium(II)-aluminum(III)-sulfate (PFMAS). First, procedures to prepare PFMAS and major properties of PFMAS and the leachate are all presented. Then, the removals of COD, BOD5 and color are determined with optimum conditions by jar-test.Finally, organic contaminants in the leachate before and after treatment are identified by gas chromatography coupled with mass spectrometry (GC-MS). The results indicate that the removals of color, COD, and BOD5 by coagulation with PFAMS can reach 89%, 68%, and 58%, respectively, which greatly reduces the extent of pollution and improves its appearance. About 85 kinds of organic species are identified in the leachate and some of them belong to the Black List of environmental preferred controlled pollutants considered by the USA and China Environmental Protection Agengcy. Particularly, the typical pollutants are quantitatively analyzed. The alkyl, alkene, ester, ketone, aldehyde, acyclic acid, acyclic alcohol and acyclic amine species are removed greatly (about 60-100%), and some are removed completely, while species with a benzene ring,such as aromatic acids, aromatic alcohols, aromatic amine aromatic hydrocarbons, hydroxybenzenes, and pyridines, are partially removed (about 25-70%).
Coagulation and flocculation GC-MS inorganic polymer flocculants Landfill leachate Organic pollutants Removal
Yimin Sang Jiaqing Chen Qingbao Gu Fasheng Li
Department of Environmental Engineering, Beijing Institute of Petrochemical Technology,102617 Beijin Department of Soil Pollution Control, Chinese Research Academy of Environmental Sciences,100012 Beij
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）