盐酸羟胺强化柠檬酸淋洗修复重金属污染土壤

doi:10.19741/j.issn.1673-4831.2019.0780

摘要/Abstract

摘要： 采用盐酸羟胺提高土壤重金属活性，考察其对柠檬酸洗脱土壤重金属的强化作用。在单因素试验基础上，采用响应面法进行多因素试验设计，拟合土壤重金属洗脱效果与柠檬酸投加量、盐酸羟胺投加量和液固比的关系，优化反应条件，并采用重金属洗脱率和环境风险削减率对修复结果进行评价。结果表明，与5 g·L^-1柠檬酸单独淋洗相比，加入10 g·L^-1盐酸羟胺进行混合淋洗显著提高土壤重金属洗脱率，其中Pb洗脱率提高36.2个百分点。当柠檬酸和盐酸羟胺投加量均为8 g·L^-1，液固质量比为12∶1，振荡时间为2 h时，Cu、Zn、Pb和Cd洗脱率分别为55.8%、58.3%、47.1%和47.9%，环境风险削减率分别为87.8%、85.9%、38.2%和90.7%，4种重金属弱酸提取态组分去除率在37.6%~86.2%之间，可还原态组分去除率在49.4%~80.4%之间，残渣态含量明显升高。

关键词: 重金属, 柠檬酸, 盐酸羟胺, 环境风险削减, 土壤重金属浸出浓度(TCLP), 化学形态

Abstract: Hydroxylamine hydrochloride was used to improve the activity of heavy metals in soil, and its strengthening effect on washing efficiency of heavy metals in soil by citric acid was investigated. Based on the single factor experiment, the multi-factor experiment was designed with the response surface model method. The relationships between heavy metal washing efficiency and citric acid dosage, hydroxylamine hydrochloride dosage, liquid-solid ratio were fitted. The reaction conditions were optimized, and the heavy metal washing efficiency and environmental risk reduction rate were used to evaluate the treatment results. The results show that, compared with single treatment with 5 g·L^-1 citric acid, addition of 10 g·L^-1 hydroxylamine hydrochloride significantly improved the washing efficiency of heavy metals, of which the Pb washing efficiency increased by 36.2%. When both the dosage of citric acid and hydroxylamine hydrochloride were 8 g·L^-1, the liquid-solid mass ratio was 12∶1, and the shaking time was 2 h, the washing efficiency of Cu, Zn, Pb, and Cd were 55.8%, 58.3%, 47.1% and 47.9%, respectively; and the environmental risk reduction rates were 87.8%, 85.9%, 38.2% and 90.7%, respectively. The removal rates of the weak acid extracted components of four heavy metals were between 37.6% and 86.2%, the removal rates of the reducible components were between 49.4% and 80.4%, and the contents of heavy metal in residues were significantly increased.

Key words: heavy metal, citric acid, hydroxylamine hydrochloride, environmental risk reduction, toxicity characteristic leaching procedure (TCLP), chemical specification

中图分类号:

戴竹青, 彭文文, 王明新, 张金永, 张文艺. 盐酸羟胺强化柠檬酸淋洗修复重金属污染土壤[J]. 生态与农村环境学报, 2020, 36(9): 1218-1225.

DAI Zhu-qing, PENG Wen-wen, WANG Ming-xin, ZHANG Jin-yong, ZHANG Wen-yi. Citric Acid Elution Enhanced by Hydroxylamine Hydrochloride for the Remediation of Heavy Metal Contaminated Soil[J]. Journal of Ecology and Rural Environment, 2020, 36(9): 1218-1225.

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