外源Cu胁迫下熟污泥改性黄土对Cu的吸持能力研究  

Exogenous copper intimidation on retention in loess improved by composted sludge

作　　者：李晓林[1] 金诚[1] 姚驯 周健[1] 南忠仁[1] 

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2016年第5期599-604,610,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(51178209;91025015);中央高校基本科研业务费专项资金项目(lzujbky-2015-214;lzujbky-2015-138)

摘　　要：采用序批实验,测定不同配比熟污泥改性黄土中的有机质、碳酸盐、总磷、全Cu、pH和土壤电导率,探讨了不同配比熟污泥改性黄土对重金属Cu的吸附-解吸行为.结果表明在不同配比熟污泥改性黄土中,重金属Cu的吸持量随着平衡浓度的增加而增大;Freundlich型方程是描述供试土样等温吸附线的最佳模型;乙酸铵对Cu的释放量随吸持量的增大而增大;释放率随着熟污泥配比的增大而减小;土壤固定量随着熟污泥配比的增大而增大,固定能力的增强降低了重金属带来的环境风险.Laboratory batch experiments were conducted to detect organic, carbonate, totalphosphorus, total copper, pH, electrical conductivity and to study the sorption and desorption of Cu in different rates of loess im- proved by composted sludge. The results showed that the amounts of Cu adsorbed by different rates of compost- ed sludge increased with the equilibrium concentrations; Freundlich adsorption equation was the best in describ- ing the isothermal adsorption processes of Cu; the desorption of Cu by ammonium acetate increased with ab- sorption and the desorption rate of ammonium acetate decreased in different rates of loess. As the composted sludge concentration increased, the fixed copper on soil samples increased, and the improved fixation reduced environmental risks with heavy metals.

关 键 词：熟污泥 黄土 铜 吸附 解吸 

分 类 号：O142[理学—数学]