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- Title
温度对曝气抽提修复地下水中乙苯影响研究.
- Authors
张雷; 皇甫辉远; 苗月; 曹伟锴
- Abstract
The temperature of shallow groundwater in northern China in winter is 4~10 ℃, especially in winter, the temperature is lower than 10 ℃, and the low-temperature environment affects the mass transfer process of pollutants, resulting in the poor repair effect of conventional aeration extraction. Based on this, the author takes the groundwater environment polluted by benzene series as the research object and ethylbenzene as the representative pollutant, establishes a twodimensional box simulation device for hot air enhanced AS remediation, and explores the effect of temperature on the removal of ethylbenzene in the aquifer. The results show that with the increase of aeration temperature, the temperature field in the middle and upper layer presents a "U" shape distribution, and the concentration distribution of ethylbenzene after aeration is close to the "U" shape, which corresponds to the flow pattern and heat transfer mechanism in the aeration affected area. After three-day repair, the removal rate of ethylbenzene at 60 ℃ is twice higher than that at 30 ℃, the removal efficiency of ethylbenzene is 87.73%, and the concentration of ethylbenzene is lower than 0.6 mg/L (the standard value of class Ⅳ groundwater is 0.6 mg/L). The results show that the hot air temperature affects the temperature of groundwater layer through conduction, and then affects the pollutants, therefore how does the saturated partial pressure of pollutants change, improve the volatilization removal efficiency and improve the remediation effect, would provide technical support for the remediation of benzene series pollution in low-temperature shallow land in northern China.
- Subjects
CHINA; GROUNDWATER temperature; ETHYLBENZENE; PARTIAL pressure; MASS transfer; ATMOSPHERIC temperature; GROUNDWATER purification
- Publication
Environmental Science & Technology (10036504), 2022, Vol 45, Issue 12, p70
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.1143.22.338