铜陵尾矿土壤重金属污染物的固定修复

摘要/Abstract

摘要：

化学固定法通过向土壤中添加一定的固定剂，降低重金属有效态含量达到修复土壤重金属污染的目的。利用石灰、炉渣和稻草作为土壤重金属固定剂，通过土壤与固定剂的混合来修复铜陵Cu、Cd、Zn污染土壤，分析石灰、炉渣和稻草对土壤有效态Cu、Cd、Zn的固定修复效率和土壤微生物代谢呼吸率的影响。结果表明:除石灰与炉渣单独使用时对Cu固定修复效率低，以及稻草单独使用对Cd与Zn的固定修复效率也较差外，固定剂能够显著的降低有效态Cu、Cd、Zn含量(〖WTBX〗p〖WTBZ〗<005)，尤其石灰、煤渣和稻草的混合物能够最为高效的降低有效态Cu、Cd、Zn含量，固定修复效率分别为9428%、7810%和 9857%，同时还能显著提高土壤微生物的代谢呼吸率(〖WTBX〗p〖WTBZ〗<005)，增大微生物的活性。Pearson’s相关系数分析进一步表明在重金属污染的酸性土壤中，同时增加碱性物质和有机质含量能够较为高效地降低有效态重金属含量，增强土壤微生物抗重金属胁迫和毒性耐受能力，利于土壤的复垦再利用

Abstract:

Chemical stabilization was a practical technique which uses inexpensive amendments to reduce heavymetal availability in polluted soil.This paper evaluated the effects of application of several amendments (lime,furnace slag and straw) on the immobile efficiency of heavy metals such as Cu，Cd and Zn and soil respiration rate (index for soil microbial activity) in a mine tailing soil in Tongling City.The results showed the application of the amendments significantly increased soil respiration rate(p<0.05) and enhanced soil microbial activity,and decreased the amount of available heavy metals such as Cu，Cd and Zn (p<0.05) except the weak immobile efficiency of lime and furnace slag on Cu,and straw on Cd and Zn,individually.Of all selected amendments,lime,furnace slag and straw coexisted in soil displayed the most satisfactory immobile efficiency of about 94.28%,78.10% and 98.57% for Cu，Cd and Zn,respectively.Analysis with Pearson’s correlation coefficient further indicated that amendment of alkaline materials and organic matters both in soil had better immobile ability for heavy metals,advancing soil microbial activity,and improved microbial toxicitytolerance ability on heavy metals. It could be a good choice to use mixed alkaline materials and organic matters to restore heavymetals contaminated soil in practice

胡星明, 袁新松. 铜陵尾矿土壤重金属污染物的固定修复[J]. 长江流域资源与环境, 2011, 20(11): 1378-.

HU Xingming, YUAN Xinsong. INSITU REMEDIATION OF MINE TAILING SOIL CONTAMINATED BY HEAVY METALS IN TONGLING CITY[J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2011, 20(11): 1378-.

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