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Volume 40 Issue 2
Apr.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2022  >  40(2): 162-167,176
SHEN Song, LIU Lei, WEN Wei, XING Yi, SU Wei, SUN Jiaqi. POLLUTION CHARACTERIZATION AND SOURCE ANALYSIS OF CARBON COMPONENTS OF PM2.5 IN BEIJING AND SURROUNDING AREAS IN SUMMER[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(2): 71-80. doi: 10.13205/j.hjgc.202202012
Citation: LI Jingjie, CAI Wutian, LU Yonggao, BIAN Chao, YANG Li, WANG Mingguo. EFFECT EVALUATION OF Cr（Ⅵ） CONTAMINATED GROUNDWATER REMEDIATION BY PERMEABLE REACTIVE WALL IN PILOT SCALE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(2): 162-167,176. doi: 10.13205/j.hjgc.202202025
shu

EFFECT EVALUATION OF Cr（Ⅵ） CONTAMINATED GROUNDWATER REMEDIATION BY PERMEABLE REACTIVE WALL IN PILOT SCALE

doi: 10.13205/j.hjgc.202202025

  • Center for Hydrogeology and Environmental Geology,China Geological Survey, Baoding 071051, China

  • Received Date: 2021-01-21
    Available Online: 2022-04-02
  • Publish Date: 2022-04-02
    Abstract
  • In this paper, taking Cr(Ⅵ) contaminated groundwater site as an example, based on the size and reaction medium of PRB wall determined by indoor simulation experiment, the water level and water environment indexes of the monitoring well inside and outside the wall were monitored for four times in 10 months after the completion of the PRB wall. The results showed that the groundwater velocity in the PRB wall was greater than that in the surrounding aquifer. Although the groundwater flow direction changed locally, it still passed through the PRB wall vertically and no flow around was found. The monitoring data of four consecutive periods showed that no Cr(Ⅵ) was detected inside the wall, affected by the wet season, and the concentration of Cr(Ⅵ) in the upper and lower reaches of the wall in the fourth period was significantly higher than that in other periods. The pH value of groundwater in the upstream and downstream of the wall was between 6.5 and 8.5, meeting the requirements of China's national drinking water standard. Due to the corrosion of iron in the wall, the pH value increased rapidly and ranged in 9~10.5, which was significantly higher than that in the upstream and downstream of the wall. There was a strong oxidation-reduction reaction in the wall, and the ORP values monitored in three consecutive periods were negative(-260~-140 mV), indicating a strong reducing environment. Fe(Ⅱ) concentration in the wall was higher than that outside the wall, its distribution was uneven, and the concentration in Well G3-2 was the highest, with a value of 3.52 mg/L; the removal of Cr(Ⅵ) in the wall was carried out simultaneously with the removal of Ca2+, Mg2+, HCO3- and SO4-, and Mg2+ and SO4- were the main influencing factors of Cr(Ⅵ) removal. To sum up, in the case of remediation of Cr(Ⅵ) contaminated groundwater by permeable reaction wall at pilot scale, the wall was in a strong reducing and alkaline environment during the monitoring period of 10 months, the reactive material was highly active, and the remediation effect of hexavalent chromium was obvious.
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