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| Pollution characteristics of PAHs in soil at an abandoned coking plant affected by different sources |
| MENG Xiang-shuai1,2, CHEN Hong-han1, ZHENG Cong-qi3, WANG Xi4, YUE Xi2 |
1. School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China;
2. CERI Eco Technology Co., Ltd, Beijing 100053, China;
3. Shandong Hydrology and Water Resources Bureau, Jinan 250024, China;
4. Center for Hydrogeology and Environmental Geology Survey, Baoding 071051, China |
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Abstract The coking plant site could be divided into the coal stockyard, the coking unit, the chemical product unit according to manufacturing processes. 40 soil samples were collected from different areas in order to analysis levels, distribution, polluted ways and composition of PAHs in soil of the coking plant affected by different sources. The site was severely polluted and BaP was the primary pollutant being relevant to health risks. The chemical product unit (1733.87mg/kg) > the coking unit (32.86mg/kg) > the coal stockyard (21.21mg/kg) based on median values of ΣPAHs concentration, leakage or landfill of chemical products, dry/wet deposition from exhaust, leaching of coal-like materials were the main corresponding causes for the different PAHs levels of the three units. It is hard to distinguish source characteristic of PAHs distinctly in soil of different units by just using isomeric ratios. According to the ratio of low molecular weight PAHs between high molecular weight PAHs, the chemical product unit (deep soil, 7.39)>the chemical product unit (surface soil, 1.33)>the coal stockyard (1.06)>the coking unit (0.39). Composition of PAHs in soils mainly depended on characteristic of pollutants from different sources and degradation from external environment together. 4, 5ring PAHs were the primary pollutants of the soils, PAHs in the coal stockyard and the chemical product unit were dominated by Nap and Phe, whereas BbF, Fla, Chry accounted for larger proportion in the coking unit.
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Received: 20 March 2020
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