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Volume 40 Issue 9
Nov.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2022  >  40(9): 158-166
YI Hongxue, LI Jie, WANG Yae, ZHAO Wei, XIE Huina, ZHANG Wenli, QUAN Hairong, MU Hao, HU Kaiyao. EFFECTS OF ACHROMOBACTER DENITRIFICANS STRAIN 2-5 WITH IRON OXIDATION AND AEROBIC DENITRIFICATION FUNCTION ON BIOLOGICAL NITROGEN REMOVAL PERFORMANCE AND COMMUNITY STRUCTURE IN A SEQUENCING BATCH REACTOR[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 211-216. doi: 10.13205/j.hjgc.202212028
Citation: KANG De-jun, LÜ Jiang-du, TUO Xiang-yin, CAI Jin-shui, GONG Ya-ping, ZHAO Ying. POLLUTION CHARACTERISTICS AND ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN COVERING SOIL SYSTEM OF A COAL GANGUE HILL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 158-166. doi: 10.13205/j.hjgc.202209021
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POLLUTION CHARACTERISTICS AND ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN COVERING SOIL SYSTEM OF A COAL GANGUE HILL

doi: 10.13205/j.hjgc.202209021

  • 1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;

  • 2. Institute of Water Ecology and Environment, Chinese Research Academy of Environmental Sciences, Beijing 100020, China;

  • 3. Ningxia Yuansheng Lvyang Forest & Grass Ecological Engineering Co., Ltd, Yinchuan 750000, China

  • Received Date: 2021-06-11
    Available Online: 2022-11-09
    Abstract
  • Soil covering has been used to isolate coal gangue from oxygen, and it can rapidly remediate coal gangue waste. However, the coal gangue which has long-term piled can release heavy metals under the rain leaching and groundwater soaking, which will diffuse to the surrounding soil with water flow. Meanwhile, the released heavy metals will also migrate to the upper covering soil under the action of soil capillarity and plant root activity, therefore impact soil quality. We chose a coal gangue hill in Ningdong, Ningxia as the research object, and analyzed the spatial distribution characteristics of Cu, Zn, Pb, Cr, Cd, As, Mn, and Ni in the covering soil at different depths of the coal gangue hill and the surrounding soil within 0~200 m distance from the coal gangue hill. We also explored the status quo of soil environmental quality, and comprehensively assessed the potential ecological risks of soils. The results showed that Cr was the main pollutant in the study area. Cr content in the covering soils was higher than the control in 86.36% of the sampling sites, and Cr content was higher than that of the soil background value of the control point in 100% and 50% of the sampling sites of the surrounding surface soil and deep soil, respectively. Toxic heavy metals in coal gangue migrated to the covering soil to a certain extent, and the heavy metals in the soil directly contacting with coal gangue layer were enriched obviously. The coal gangue dust diffusion is the main way to enrich heavy metals in the surrounding soil, and its significant influence range was within 10 m of the gangue hill. The potential ecological risk index(RI) of soils around the coal gangue hill ranged from 40.80~63.31, indicating that the pollution extent was all slight. RI value of the covering soil was between 44.83~70.54, and the pollution extent was of only one sampling point reached the medium level.
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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