首页 > 过刊浏览>2022年第59卷第6期 >1561-1573. DOI:10.11766/trxb202102090088
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场地土壤环境承载力估算及其在土壤污染修复目标值确定中的应用
作者:
中图分类号:

X26;X825

基金项目:

国家重点研发计划项目（2021YFC1809100）和国家自然科学基金项目（72104231）资助


Estimation of Soil Environmental Carrying Capacity and Its Application in the Determination of Remediation Target in Contaminated Sites
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Fund Project:

Supported by the National Key R&D Program of China (No. 2021YFC1809100) and the National Natural Science Foundation of China (No. 72104231)

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    摘要:

    土壤环境承载力研究是“土十条”中加强土壤污染防治研究的重要内容，在场地土壤污染修复目标值确定方法中耦合土壤环境承载力的估算模型能够极大地提升修复目标值制定的科学性。以江苏省某市废弃化工场地为研究对象，针对场地土壤中的三种主要污染物汞、六氯苯和氯苯，通过场地土壤布点采样分析，进行了污染物浓度空间分布特征分析和健康风险评价，并基于土壤环境承载力计算公式进行了三类目标污染物的土壤环境承载力和修复目标值的估算。研究结果表明，目标场地土壤中汞和六氯苯浓度超过筛选值的样点占到总样点的50%以上，而氯苯浓度超过筛选值的样点占到了总样点的17%，其空间分布主要受生产过程中的污染源的分布及生产工艺影响；土壤汞和氯苯存在较为严重的非致癌风险，而六氯苯存在严重的致癌风险；以风险筛选值作为环境质量标准的一般情景下的三种污染物的土壤环境承载力均有样点出现了小于0，即超过承载力的现象；以风险管控值为环境质量标准的乐观情景下，该三种污染物的环境承载力均大于0，即该区域还具备继续吸纳污染物的能力；基于土壤环境承载力估算模型的修复目标值较对应的风险筛选值和管控值均高出1.8倍~1.9倍，这是由于在承载力估算模型中对风险产生过程以及土壤对污染物吸附固定过程进行了系数校正的原因。以上研究结果为污染物的土壤环境承载力研究的发展及应用提供了思路和技术方法。

    Abstract:

    Objective It is important to study the soil environmental carrying capacity for soil pollution prevention and control in "The Action Plan for Prevention and Treatment of Soil Pollution". Application of the estimation model of soil environmental carrying capacity could greatly improve the science content of the method of remediation target determination.Method Taking an abandoned chemical site in Jiangsu Province as a case study, the spatial distribution and health risk assessment of three target pollutants (i.e. mercury, hexachlorobenzene, and chlorobenzene) were analyzed based on soil sampling and investigation in the site. The environmental carrying capacities and remediation target values for the pollutants were estimated using the soil environmental carrying capacity model.Result The results revealed that more than half of the sites had soil mercury and hexachlorobenzene excessing their risk screening values, with about 17% for chlorobenzene. The spatial distributions of all three pollutants were mainly dependent on the distribution of the sources and manufacturing processes. Importantly, a serious non-carcinogenic risk is suggested for mercury and chlorobenzene, while a serious carcinogenic risk for hexachlorobenzene. Results of the soil environmental carrying capacity estimation suggested that, under a normal scenario and taking the risk screening value as soil quality standard, there were areas in the site having an environmental carrying capacity for all three pollutants less than zero. This indicated that the contamination of those areas excessed the soil environmental carrying capacities. Under an optimistic scenario and taking the risk controlling value as soil quality standard, the whole site had environmental carrying capacities for all three pollutants greater than zero. This suggested that the site can contain more pollutants.Conclusion The remediation target values calculated by the soil carrying capacity estimation model were 1.8 to 1.9 times higher than the corresponding risk screening and control values. This was due to the coefficient calibration during the processes of risk emergence, soil adsorption, and fixation of pollutants in the carrying capacity model. The results in this study can provide scientific and technical support for the development and application of soil environmental carrying capacity.

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丁寿康,王美娥,王玉军,李笑诺,陈卫平.场地土壤环境承载力估算及其在土壤污染修复目标值确定中的应用[J].土壤学报,2022,59(6):1561-1573. DOI:10.11766/trxb202102090088 DING Shoukang, WANG Meie, WANG Yujun, LI Xiaonuo, CHEN Weiping. Estimation of Soil Environmental Carrying Capacity and Its Application in the Determination of Remediation Target in Contaminated Sites[J]. Acta Pedologica Sinica,2022,59(6):1561-1573.

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  • 收稿日期:2021-02-09
  • 最后修改日期:2021-09-07
  • 录用日期:2021-10-20
  • 在线发布日期: 2022-01-07
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