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| Cumulative distribution and risk assessment of heavy metals during sewage irrigation |
| Received:March 09, 2018 Revised:July 03, 2018 |
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| KeyWord:sewage irrigation;heavy metal;distribution and accumulation;risk evaluation |
| Author Name | Affiliation | E-mail | | LIAO Qiang | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China | | | LI Jin-xin | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China | | | LI Ming-zhu | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China | | | DONG Yuan-peng | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China | | | WU Mi | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China | | | MENG Zi-lin | School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China | | | LI Meng-hong | School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China | | | LIU Ai-ju | School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China | liuajsdut@gmail.com |
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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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