污泥源腐殖酸对铅铬复合污染土壤的淋洗效果研究
Study on leaching effect of sludge-sourced humic acid on soil contaminated by lead and chromium
王英戈 1杨凯 2张卫珂 3介颖泽 1杨艳青1
作者信息
- 1. 太原理工大学环境科学与工程学院,山西 太原 030024
- 2. 北京师范大学水科学研究院,北京 100875
- 3. 太原理工大学材料科学与工程学院,山西 太原 030024
- 折叠
摘要
以某污水处理厂的市政污泥为原料,从市政污泥中提取腐殖酸,分别对云南某冶炼厂以及湖北某矿区采集的铅铬复合污染土壤进行淋洗处理,研究土壤与腐殖酸固液比分别为1∶10、1∶20、1∶30下对土壤中铅、铬的去除效果.利用SEM、FT-IR对污泥源腐殖酸进行表征,利用ICP-MS以及紫外分光光度计对淋洗前后土壤的重金属含量、分布形态以及酶活性进行测量.结果表明,污泥源腐殖酸能减少土壤中重金属的有效态含量;在土壤与腐殖酸淋洗剂固液比为1∶20的情况下对红土中重金属铅的去除效果最好;1∶30的情况下对黑土中Pb的去除效果最好;腐殖酸对红土以及黑土中重金属Cr的去除效果随着土壤与腐殖酸固液比的增加而增加,这是由于腐殖酸含有大量的官能团,能为重金属络合反应提供活性位点,从而减少土壤中的重金属含量.
Abstract
Humic acid is extracted from the municipal sludge of Zhengyang Sewage Treatment Plant in Jinzhong city,Shanxi province,China,and used to leach the Pb-Cr compound contaminated soil collected from a smelting plant in Yunnan province and a mining area in Hubei province,respectively.The effects of the mass ratio of soil to humic acid at 1∶10,1∶20,and 1∶30,respectively on the removal of lead and chromium from the contaminated soil are studied.The humic acid extracted from the sludge is characterized by means of SEM and FT-IR,and the contents,distribution forms and enzyme activities of heavy metals in the soil before and after leaching are measured by means of ICP-MS and UV spectrophotometer.Results show that the sludge-derived humic acid can reduce the available content of heavy metals in the soil,the removal effect of Pb in red soil reaches the best when the ratio of soil to humic acid is 1∶20,and that in black soil reaches the best when the ratio is 1∶30.The removal effect of humic acid on Cr in red soil and black soil increases with the increasing ratio of humic acid to soil.This is because humic acid contains a large number of functional groups,which can provide active sites for heavy metal complexation reaction,thus reducing the content of heavy metals in soil.
关键词
腐殖酸/铅/铬/淋洗/重金属形态分布Key words
humic acid/eluting/Cr/Pb/speciation distribution of heavy metals引用本文复制引用
基金项目
山西省自然科学基金面上项目(202203021211162)
山西省自然科学基金面上项目(2021RC-2-16)
出版年
2024
NETL
NSTL
万方数据