Organic contamination and flocculation treatment of landfill leachate secondary effluent
The most popular biological process in use today for the treatment of landfill leachate frequently does not conform to the National Industry Drainage Standard. Current post-treatment technology is limited by high operating costs, low treatment efficiency, or sensitive operating conditions. In this study, leachate secondary effluent was treated with a novel inorganic coagulant, poly-aluminum(III)-magnesium(II)-sulfate (PMAS), and its organic matter content was determined by gas chromatography coupled with mass spectrometry (GC-MS). We described the procedure used to prepare PMAS and the major properties of PMAS and the leachate secondary effluent. We determined the removal of color, chemical oxygen demand (COD), and biological oxygen demand (BOD5) and the solid separation of sludge. Organic contaminants in the secondary effluent before and after treatment were identified by GC-MS. The results demonstrate that removal of color,COD, and BOD5 by coagulation with PAMS can reach 85.6%, 62.6%, and 58.8%, respectively, which greatly reduces the extent of pollution and improves its appearance. PMAS performs coagulation/flocculation mainly by charge-neutralization and the flocculation sludge has good solid separation. More than 40 organic species were identified in the secondary effluent and some of them belong to the Black List of environmental preferred controlled pollutants considered by the USA and China Environmental Protection Agency. The alkyl, alkene, acyclic alcohol and acyclic acyl amine species are removed efficiently (～ 85%), and some are removed completely, while the acid, ester and ketone species are mostly removed (～ 65%) and species with a benzene ring, such as aromatic hydrocarbons, hydroxybenzenes, aromatic alcohols, and aromatic acyl amines, are partially removed (～ 50%).
Landfill leachate Secondary effluent Organic pollutants Flocculation treatment GC-MS
Yimin Sang Cunzhen Liang Jiaqing Chen Hui Kong
Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, 19 Qingyuan North Road, Daxing District, 102617 Beijing, China
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）