Sang Yimin, Gu Qingbao, Sun Tichang, Li Fasheng, Pan Yiting
College of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing, China.
Ann N Y Acad Sci. 2008 Oct;1140:412-9. doi: 10.1196/annals.1454.014.
A novel inorganic flocculent composite of Al(III)-Mg(II) poly-magnesium-aluminum-sulfate (PMAS) is used to remove organic matter from biologically treated leachate in some landfills in Beijing, China. Jar-test experiments are employed to determine the optimum conditions for the removal of organic matter, which is represented as UV(254). Under optimum conditions, the removal of COD, BOD(5), and color is also determined. Moreover, gas chromatography coupled with mass spectrometry (GC-MS) is used to analyze the organic matter in the biologically treated leachate before and after treatment by the coagulant. The experimental results indicate that the removal of COD, BOD(5), UV(254), and color by coagulation with PMAS can reach above 65%, 60%, 85%, and 85%, respectively, under optimal conditions. This greatly weakens its pollution extent and improves its visual appeal. Forty-one kinds of organic pollutants in the biologically treated leachate were determined. Some of them belong to the Black List of water environmental preferred controlled pollutants, as judged by the United States and China. The species of alkyl, alkene, acyclic alcohol, and acyclic acyl amines are about 85% removed, some of them are removed completely, while the species of acids, esters, and ketones are removed at about 65%. Those contaminants with benzene rings, such as aromatic hydrocarbons, hydroxybenzene, aromatic alcohol, and aromatic acyl amine, are about 50% partially removed.
一种新型的无机絮凝剂铝（III）-镁（II）聚镁硫酸铝（PMAS）被用于去除中国北京一些垃圾填埋场经生物处理的渗滤液中的有机物。采用烧杯试验来确定去除有机物的最佳条件，有机物用UV(254)表示。在最佳条件下，还测定了化学需氧量（COD）、五日生化需氧量（BOD₅）和色度的去除情况。此外，气相色谱-质谱联用仪（GC-MS）用于分析在经混凝剂处理前后的经生物处理的渗滤液中的有机物。实验结果表明，在最佳条件下，用PMAS混凝去除COD、BOD₅、UV(254)和色度的去除率分别可达65%以上、60%、85%和85%以上。这大大降低了其污染程度并改善了其外观。测定了经生物处理的渗滤液中的41种有机污染物。其中一些属于美国和中国判定的水环境优先控制污染物黑名单。烷基、烯烃、无环醇和无环酰胺类的种类去除率约为85%，其中一些被完全去除，而酸、酯和酮类的种类去除率约为65%。那些带有苯环的污染物，如芳烃、苯酚、芳醇和芳酰胺，约50%被部分去除。
