%0 Journal Article
%T Buffer Capacity of Aquifer Media Polluted by Landfill Leachate<br>含水层介质对垃圾渗滤液污染缓冲性研究
%A DONG Jun
%A ZHAO Yong-sheng
%A LIU Ying-ying
%A <br>董军
%A 赵勇胜
%A 刘莹莹
%J 环境科学
%D 2009
%I 
%X A column filled with fine sand was constructed to investigate pH buffering capacity and redox buffering capacity of aquifer media. Experimental results indicated that calcium carbonate played a significant role in pH buffering; with the aggravating of landfill leachate pollution, the pH buffering capacity of calcium carbonate was increased; it increased from background value, which was 1.62·pH-1 mmol/kg, to 41.3·pH-1 mmol/kg. With the aggravating of landfill leachate pollution, the oxidation capacity (OXC) of aquifer media was decreased, and the reduction capacity (RDC) was increased. In unpolluted aquifer media, Fe3+ was the main component of OXC, and accounted for about 70.5% of OXC; TOC was the main component of RDC, and accounted for about 98.7% of RDC. Species of the minerals was related to the degree of pollution; large fraction of amorphous Fe3+ and part of crystalline Fe3+ were reduced near the pollution source, and the reduced product was mainly precipitated as FeCO3 and FeS. Deposit of produced Fe2+ led to ion-exchangeable Fe2+ content increased from 0.5% of uncontaminated aquifer media to 3%. Therefore, Fe3+ may act as a very significant redox buffer in aquifer.
%K aquifer
%K landfill leachate
%K redox buffering
%K pH buffering<br>含水层
%K 垃圾渗滤液
%K 氧化还原缓冲
%K pH缓冲
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=33DF0C42398662124641730DA3CF1038&yid=DE12191FBD62783C&vid=340AC2BF8E7AB4FD&iid=0B39A22176CE99FB&sid=D8B37A0210DB6B9D&eid=036D726259190A01&journal_id=0250-3301&journal_name=环境科学&referenced_num=2&reference_num=15