Empirical analysis of soil and groundwater remediation in contaminated sites in Tianjin
MENG Hao1, MEI Dan-bing2, DENG Jing-fei2, LIU Peng3, DONG Jing-qi2,3, XIAO Meng1, ZHANG Hong-zhen2,3, LI Xiang-lan1
1. College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China; 2. Chinese Academy of Environmental Planning, Beijing 100012, China; 3. National Engineering Laboratory for Site Remediation Technologies, Beijing 100015
Abstract:This study selected Tianjin as the research area and revealed the impact of remediation behavior at the regional scale by analyzing remediation characteristics, pollutant fate, technology application, and remediation carbon emissions. During the 7 years from 2015 to 2021, 44 industrial contaminated sites, 8788100m3 of contaminated soil and 20 groundwater contaminated sites, covering an area of 1066400m2, were remediated. In the future, the volume of remediation would keep rising. Organic pollution was the main type of soil remediation, and 40270.48t of 6types of characteristic contaminants were remediated. The remediation technology showed a trend of off-situ transition to in situ, in which in situ chemical oxidation, barriers and pump and treat were the most frequently applied in soil and groundwater remediation, respectively. The total carbon emission and carbon emission intensity in the past 7 years were 1253900t and 0.14t/m3, respectively, and groundwater remediation also depended on high carbon emission remediation technology, and the overall sustainability of remediation need to be strengthened. The calculated results of this study had certain uncertainties, among which the average concentration of pollution factors in soil and carbon emission factors of remediation technology had a great impact on the material flow and carbon emission results. It is suggested to strengthen the assessment system of green sustainable remediation of contaminated soil and groundwater at the regional level, improve the dynamic tracking level of contaminated material flow and management ability, and explore the sustainable risk management system under coastal facies geological conditions.
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