Field study on ERT monitoring high-pressure rotary jet repairing PAHs pollution
LIU Di1, SONG Quan-wei2,3, LI Ling4, HU Jie1, WANG Ting-jun4, DU Xian-yuan2,3, DENG Yong-feng5, KE Han1
1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. State Key Laboratory of Petroleum Pollution Control, Beijing 102206, China; 3. CNPC Research Institute of Safety and Environment Technology, Beijing 102206, China; 4. CECEP DADI Environmental Remediation Co., Ltd., Beijing 100085, China; 5. Institute of Geotechnical Engineering, Transportation College, Southeast University, Nanjing 210096, China
Abstract：In this study, sodium persulfate (PS) was selected as the oxidant, Fe0[μm], Fe0[nm, BC-nZVI and NaOH were chosen as activators, and repair PAHs-contaminated soil through high-pressure rotary spraying process by mixture of PS and activators. The high-density electrical resistivity tomography (ERT) technique was employed to monitor the distribution of soil resistivity during the rotary jet process, enabling an analysis of the migration and transformation patterns of the oxidation agents during the remediation process. Additionally, the remediation effects of the 4 agent groups were compared after a 48-hour jet period.The experimental results demonstrated that ERT accurately reflected the locations of pollution remediation, with a maximum deviation of less than 0.5m. The changes in resistivity showed a positive correlation with naphthalene remediation. However, discrepancies existed between the estimated remediation values obtained from fitting curves and the actual remediation values, with errors ranging from 10.3% to 22.6%. Among the tested reagents, carbon-supported iron powder exhibited excellent stability and sustained release performance, leading to an extension of the stable oxidation stage by approximately 8hours after jet. Ultimately, the predetermined remediation area achieved the highest level of pollutant removal in the following order:BC-nZVI>Fe0[nm]>Fe0[μm]≈NaOH.
柳迪, 宋权威, 李玲, 胡杰, 王颋军, 杜显元, 邓永锋, 柯瀚. ERT法监测高压旋喷修复PAHs污染现场试验研究[J]. 中国环境科学, 2023, 43(11): 5933-5943.
LIU Di, SONG Quan-wei, LI Ling, HU Jie, WANG Ting-jun, DU Xian-yuan, DENG Yong-feng, KE Han. Field study on ERT monitoring high-pressure rotary jet repairing PAHs pollution. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5933-5943.
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