• 关键词：垃圾渗滤液  水溶性有机物  吸附  Cd²⁺/Pb²⁺

• 基金项目：国家自然科学基金项目(No.40571073)

• 付美云
• 1. 南京农业大学资源环境学院环境工程系, 南京 210095; 2. 湖南环境生物职业技术学院, 衡阳 421005

• 周立祥
• 南京农业大学资源环境学院环境工程系, 南京 210095

• 摘要：采用序批次吸附试验,研究了不同填埋年限(0、4～5、12a)垃圾渗滤液中的DOM对土壤吸持重金属Cd²⁺、Pb²⁺的影响.结果表明,垃圾渗滤液中的DOM能促进土壤对重金属Cd²⁺、Pb²⁺的吸附.在有垃圾渗滤液DOM存在的条件下,Cd²⁺、Pb²⁺的吸附等温线可用Freundlich方程拟合(R²>0.94),土壤对Cd²⁺、Pb²⁺的吸附量比对照处理(无垃圾渗滤液DOM)分别高1.13～1.42倍和1.09～1.84倍,填埋年限长的垃圾渗滤液较之填埋年限短的渗滤液对土壤吸附Cd²⁺、Pb²⁺的影响强烈.在Cd²⁺、Pb²⁺初始浓度相同时,潮土较红壤具有更高的吸持能力,并且随体系pH的增高,其吸持量增加.

• Abstract：Batch adsorption experiments were carried out to investigate effect of dissolved organic matter(DOM) of landfill leachate derived from different landfill sites(0、4～5、12y) on the sorption of Cd²⁺,Pb²⁺ in the acidic and calcareous soil. The results showed that the sorption of Cd²⁺,Pb²⁺ in soils was enhanced in the presence of landfill-leachate DOM. The Sorption isotherm of Cd²⁺,Pb²⁺ in soils in the presence of different landfill leachate DOM could be described well by the Frenudlich eqation(R²>0.94), and the Sorption of Cd²⁺ and Pb²⁺ in soils were 1.13 to 1.42 and 1.09 to 1.84 times higher than the control in Absence of landfill leachate DOM, respectively. At the same initial concentration of Cd²⁺ and Pb²⁺, acidic soil demonstrated much less ability to retain the Cd²⁺ and Pb²⁺ than calcareous soil due to much lower pH in the former, and landfill-leachate of longer landfill age enhanced sorption of Cd²⁺,Pb²⁺ in soils in comparison with the shorter the landfill age of landfill-leachate. The results showed that in the presence of landfill leachate DOM, increase of Cd²⁺,Pb²⁺ sorption capacity in soils was obvious with an increase in pH.

• Key words：landfill-leachate  DOM  adsorption  Cd²⁺/Pb²⁺

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