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改性硅藻土混合固化剂对土壤中锰、铅和锌固化效果的研究

Study of the Effects on Mn, Pb, and Zn Solidification in Soil by a Mixed Curing Agent of Modified Diatomite.

作者信息

Li Zhixian, Chen Limei, Chen Zhang, Chen Guoliang, Zhou Jianlin, Liu Xiling

机构信息

Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan 411201, China.

School of Resources and Safety Engineering, Central South University, Changsha 410083, China.

出版信息

ACS Omega. 2022 Jul 18;7(29):25229-25238. doi: 10.1021/acsomega.2c02135. eCollection 2022 Jul 26.

DOI:10.1021/acsomega.2c02135
PMID:35910122
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9330184/
Abstract

In order to improve the application scale of diatomite in the remediation of heavy metal-contaminated soil in non-ferrous metal mining areas, the preparation of the modified diatomite-combined curing agent and its stabilizing effect on manganese (Mn), lead (Pb), and zinc (Zn) were systematically studied in non-ferrous metal tailing soil in this paper. The results showed that compared with that in natural diatomite (DE), the contents of available Mn in soil treated by acid- and alkali-modified diatomite samples (C-D and Na-D) were 18.82 and 25.93% lower, respectively, and the content of available Zn in Na-D was significantly lower, 6.71%, than that in DE. Further research showed that modified diatomite combined with quicklime (CaO) and hydroxyapatite (HAP) could significantly improve the solidification effect of soil heavy metals. Compared with that in single modified diatomite, the contents of available Mn, Pb, and Zn in the mixed curing agent-treated soil decreased by 23.59-46.32, 5.88-47.93, and 5.37-10.68%, respectively. The final pot test showed that the mixed curing agent of modified diatomite had no significant effect on the growth of plants, but it could reduce the Mn, Pb, and Zn accumulation in the upper and lower parts of plants, which is because the acid-soluble and reducible heavy metals in soil transform into an oxidizable and residual state, which reduces the mobility of heavy metals.

摘要

为提高硅藻土在有色金属矿区重金属污染土壤修复中的应用规模，本文以有色金属尾矿土为研究对象，系统研究了改性硅藻土复合固化剂的制备及其对锰（Mn）、铅（Pb）和锌（Zn）的稳定化效果。结果表明，与天然硅藻土（DE）相比，经酸碱改性的硅藻土样品（C-D和Na-D）处理的土壤中有效态Mn含量分别降低了18.82%和25.93%，Na-D中有效态Zn含量比DE显著降低了6.71%。进一步研究表明，改性硅藻土与生石灰（CaO）和羟基磷灰石（HAP）复合能显著提高土壤重金属的固化效果。与单一改性硅藻土处理的土壤相比，混合固化剂处理的土壤中有效态Mn、Pb和Zn含量分别降低了23.59%-46.32%、5.88%-47.93%和5.37%-10.68%。最终盆栽试验表明，改性硅藻土混合固化剂对植物生长无显著影响，但能降低植物地上部和地下部Mn、Pb和Zn的积累，这是因为土壤中酸溶态和可还原态重金属转化为可氧化态和残留态，降低了重金属的迁移性。

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