| Title: | [Simulation on remediation of benzene contaminated groundwater by air sparging] |
| Author(s): | Fan YL; Jiang L; Zhang D; Zhong MS; Jia XY; |
| Address: | "Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, China Urban Environmental Pollution Control Center, Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China. flylinger@163.com" |
| ISSN/ISBN: | 0250-3301 (Print) 0250-3301 (Linking) |
| Abstract: | "Air sparging (AS) is one of the in situ remedial technologies which are used in groundwater remediation for pollutions with volatile organic compounds (VOCs). At present, the field design of air sparging system was mainly based on experience due to the lack of field data. In order to obtain rational design parameters, the TMVOC module in the Petrasim software package, combined with field test results on a coking plant in Beijing, is used to optimize the design parameters and simulate the remediation process. The pilot test showed that the optimal injection rate was 23.2 m3 x h(-1), while the optimal radius of influence (ROI) was 5 m. The simulation results revealed that the pressure response simulated by the model matched well with the field test results, which indicated a good representation of the simulation. The optimization results indicated that the optimal injection location was at the bottom of the aquifer. Furthermore, simulated at the optimized injection location, the optimal injection rate was 20 m3 x h(-1), which was in accordance with the field test result. Besides, 3 m was the optimal ROI, less than the field test results, and the main reason was that field test reflected the flow behavior at the upper space of groundwater and unsaturated area, in which the width of flow increased rapidly, and became bigger than the actual one. With the above optimized operation parameters, in addition to the hydro-geological parameters measured on site, the model simulation result revealed that 90 days were needed to remediate the benzene from 371 000 microg x L(-1) to 1 microg x L(-1) for the site, and that the opeation model in which the injection wells were progressively turned off once the groundwater around them was 'clean' was better than the one in which all the wells were kept operating throughout the remediation process" |
| Keywords: | "*Air Benzene/analysis/*isolation & purification Computer Simulation Environmental Restoration and Remediation/methods Groundwater/*analysis Water Pollutants, Chemical/analysis/*isolation & purification Water Purification/*methods;" |
| Notes: | "MedlineFan, Yan-Ling Jiang, Lin Zhang, Dan Zhong, Mao-Sheng Jia, Xiao-Yang chi English Abstract Research Support, Non-U.S. Gov't China 2013/01/18 Huan Jing Ke Xue. 2012 Nov; 33(11):3927-34" |
