Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (4): 1139-1150.doi: 10.13278/j.cnki.jjuese.20190146

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Pumping Treatment Technology to Pump out Contaminated Groundwater: Extraction Efficiency and Extraction Endpoint

Gong Zhiqiang1,2, Tian Xizhao2, Liu Weijiang1, Chen Jian1, Kang Yang1, Yang Guang1, Dang Zhiwen3   

  1. 1. Yangtze River Economic Zone Ecological Environment Joint Research Center, Chinese Academy for Environmental Planning, Beijing 100012, China;
    2. Hebei Key Laboratory of Geological Resources and Environment Monitoring and Protection, Hebei Geological Environmental Monitoring Institute, Shijiazhuang 050021, China;
    3. Department of Municipal and Environmental Engineering, Hebei University of Architecture, Zhangjiakou 075000, Hebei, China
  • Received:2109-07-23 Published:2020-07-29
  • Supported by:
    Supported by National Water Pollution Control and Governance Major Project (2018ZX07109-001),National Survey and Evaluation Project of Groundwater Environmental Basic Conditions (2110302) and Hebei Provincial Department of Science and Technology Soft Science Research Project (18453621)

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Abstract: In the process of recovery of polluted groundwater by pumping treatment technology,the extraction efficiency of pump decreases gradually over time,and it is difficult to determine the end point of pumping treatment. In order to improve the efficiency of extraction, reduce repair costs, repair time of the treatment, multiple optimization of pumping scheme is proposed. By using the analytic hierarchy process and expert scoring method, the index weight, quantitative characterization of the optimal time node, and the extraction endpoint are realized. Taking a chromium salt plant in Hebei as an example, the above method was applied to optimize the pumping scheme. The results showed that when the pumping efficiency was 20%-40%, the proportion of the pumping scheme (P3) was the largest. In the first time optimization, P3 should be re-arranged after 100 d pumping. The second optimization plan is to combine with other rehabilitation technologies after the first optimization, that is to continue pumping for 300 d after the first optimized pumping scheme was used; and then, to treat the remaining contaminated groundwater of the site with other rehabilitation technologies. After evaluation, the second optimization can effectively improve the pumping efficiency of the pumping well, shorten the repair time by 600 d, and increase the removal rate of hexavalent chromium in the aquifer by 8.31% in the same time.

Key words: extraction efficiency, extraction endpoint, evaluation index system, analytic hierarchy process, optimization

CLC Number: 

  • X703
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