| 污灌条件下重金属在土壤中的累积效应及风险评价 |
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| 引用本文： | 廖强,李金鑫,李明珠,董远鹏,吴咪,孟子霖,李梦红,刘爱菊.污灌条件下重金属在土壤中的累积效应及风险评价[J].农业环境科学学报,2018,37(11):2560-2569. |
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| 作者姓名： | 廖强 李金鑫 李明珠 董远鹏 吴咪 孟子霖 李梦红 刘爱菊 |
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| 作者单位： | 山东理工大学农业工程与食品科学学院, 山东 淄博 255091,山东理工大学农业工程与食品科学学院, 山东 淄博 255091,山东理工大学农业工程与食品科学学院, 山东 淄博 255091,山东理工大学农业工程与食品科学学院, 山东 淄博 255091,山东理工大学农业工程与食品科学学院, 山东 淄博 255091,山东理工大学资源与环境工程学院, 山东 淄博 255091,山东理工大学资源与环境工程学院, 山东 淄博 255091,山东理工大学资源与环境工程学院, 山东 淄博 255091 |
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| 基金项目： | 国家自然科学基金项目（41671322，41771348）；山东省自然科学基金项目（ZR2015DM010）；校城融合支持计划项目（2016ZBXC102） |
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| 摘 要： | 为研究重金属在土壤污灌条件下的累积效应及风险评价,以褐土为研究对象,采用室内土柱模拟实验,分析了Cu在不同灌溉土层中的质量分数以及Zn的添加对其累积效应的影响,并利用相关指标对各层土壤重金属的污染情况进行了风险评估。结果表明:在两种污水灌溉下,土壤中Cu和Zn的分布从上到下主要呈逐渐递减的趋势,且到土柱底部时几乎都稳定在土壤的背景值水平;与单一处理的污水灌溉相比,复合处理的污水灌溉下土壤各层Cu的含量均有所增加;同时,单因子污染指数、内梅罗综合指数显示两种污水灌溉会对表层土壤造成轻度污染,潜在生态危害指数显示除复合污染灌溉条件下0~10 cm范围内Eir(Cu)为45.13处于中等危害等级外,其余情况下两种污水灌溉对土壤的生态危害程度均在轻微危害程度范围;此外,随着灌水量的增加,两种污水灌溉下Cu和Zn的单因子指数峰值均在第四次灌溉后的0~10 cm土层中出现,最大值达到了2.16,且定期收集的滤液中Cu和Zn的含量依然能够达到《地下水环境质量标准》(GB/T 14848—2017)Ⅲ类水的要求。因此,利用污水对土壤进行灌溉,灌溉用水中的Zn能促进各层土壤对Cu的累积,且灌溉次数也在一定程度上影响重金属对土壤的污染情况,同时中短期的污水灌溉不会对地下水造成污染。
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| 关 键 词： | 污水灌溉 重金属 分布累积 风险评价 |
| 收稿时间： | 2018/3/9 0:00:00 |
| 修稿时间： | 2018/7/3 0:00:00 |
Cumulative distribution and risk assessment of heavy metals during sewage irrigation |
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| LIAO Qiang,LI Jin-xin,LI Ming-zhu,DONG Yuan-peng,WU Mi,MENG Zi-lin,LI Meng-hong and LIU Ai-ju.Cumulative distribution and risk assessment of heavy metals during sewage irrigation[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2018,37(11):2560-2569. |
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| Authors: | LIAO Qiang LI Jin-xin LI Ming-zhu DONG Yuan-peng WU Mi MENG Zi-lin LI Meng-hong and LIU Ai-ju |
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| Institution: | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China,School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China,School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China,School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China,School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China,School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China,School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China and School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China |
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| Abstract: | In order to investigate the distribution characteristics and accumulative effect of heavy metals in soil after irrigation with sewage, batch experiments of soil column irrigation were conducted and the pollution risk of heavy metals in soil was assessed simultaneously. The results showed the concentrations of Cu and Zn decreased gradually from top to bottom in the soil column and were similar to their corresponding background values at the bottom of the soil column after irrigation. The Cu concentration in different soil layers was higher when irrigated with wastewater containing a single pollutant than with wastewater containing multiple pollutants. Meanwhile, the single factor pollution index and Nemero index indicated that both kinds of wastewater would cause slight pollution of the soil. The potential ecological risk index showed that the two kinds of sewage irrigation would lead to mild harm, except when the 0~10 cm soil layer was irrigated with the multiple pollutant wastewater, which led to medium harm because its Eri (Cu)was 45.13. Besides, as the irrigation amount increased, the peak values of the single factor pollution indices of both Cu and Zn appeared in the 0~10 cm soil layer after the last time irrigation, with the maximum value reaching 2.16. The contents of Cu and Zn in the filtrate collected from the bottom of the soil column met the third grade standard of GB/T 14848-2017. This result indicated that Zn could promote the accumulation of Cu in different layers of soil under the condition of sewage irrigation, and the irrigation times also affected the pollution by heavy metals of soil to a certain extent. In addition, short-term sewage irrigation would not lead to groundwater contamination. |
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| Keywords: | sewage irrigation heavy metal distribution and accumulation risk evaluation |
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