熟污泥改性黄土对Pb2+的吸附解吸特征
Sorption and desorption of Lead in loess improved by composted sludge
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摘要: 以不同熟污泥配比改性黄土作为实验供试土壤,采用序批实验法研究了外源铅在0%、1%、2%、4%、6%、8%、10%、15%、20%、30%熟污泥质量配比的土壤样品中的吸附-解吸特征.结果表明:(1)不同熟污泥配比改性黄土对铅的吸附量随着Pb2+平衡浓度的增加而增大,且在铅初始添加浓度小于25 mg·L-1时吸附量急剧增加.(2)在实验设定的浓度范围内(Pb2+的初始添加浓度分别为0、5、10、25、50、100、200 mg·L-1),Henry模型、Langmuir模型、Freundlich模型对实验数据均有较好的拟合,但总体来看Freundlich型吸附等温方程是描述改性黄土对铅吸附的最佳模型.(3)在NH4AC作用下,改性黄土铅的解吸量随着吸附量的增加而增大.吸附量和解吸量之间的关系可以用线性方程很好地描述.当铅初始添加浓度小于25 mg·L-1时,Pb2+的解吸率随着熟污泥配比的增加而增大,大于25 mg·L-1时,解吸率随着熟污泥配比增加而减小,且解吸率变化范围在0.11%—1.35%. (4)随着改性黄土中熟污泥含量的增加,不仅增加了改性黄土中有机质和全磷的含量,而且将会增强土壤对Pb2+的吸附亲和力,降低了土壤中的铅对地下水造成二次污染的风险.Abstract: In this article,we adopted the laboratory batch experiments to test the sorption and desorption of lead in soils improved by 0%,1%,2%,4%,6%,8%,10%,15%,20%,30% composted sludge. The results revealed that:(1) The adsorption of lead in the tested soil increased with Pb2+ concentration; and the adsorption increased dramatically with initial concentrations -1.(2)Within the experimental concentration range Pb2+ adsorption was fitted well by Henry,Freundlich,and Langmuir equations, but it was best fitted by Freundlich.(3) Desorption of lead by NH4AC increased with increasing sorption. A linear equation well described the relationship between desorption and sorption. The desorption rate of lead increased with the proportion of composted sludge when the initial concentration of Pb2+ was -1, however when the initial concentration was > 25 mg·L-1,the desorption rate of lead decreased with the proportion of composted sludge,and it was in the range of 0.11%—1.35%.(4)As the composted sludge in the tested soil increased,it not only increased organic matter and total phosphorous content,but also strengthened the adsorption affinity of Pb2+,and reduced the risk of secondary contamination of Pb2+ to underground water.
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Key words:
- Composted sludge /
- loess /
- Lead /
- sorption /
- desorption
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