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| Kinetic study on the degradation of organophosphorus pesticides by microorganisms in geotextile bags |
| Received:October 14, 2019 |
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| KeyWord:organophosphorus pesticide;sediment;aerobic bacteria;anaerobic bacteria;geotextile bags;degradation kinetics;quantum chemical parameter |
| Author Name | Affiliation | E-mail | | SHA Ya-dong | School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China | | | JIANG Zhen-yun | Shanghai City Environment and Transportation Department Co., Ltd., Shanghai 200060, China | | | SU Dong-yun | Shanghai Laogang Waste Disposal Co., Ltd., Shanghai 201302, China | | | ZHOU De-sheng | Shanghai Laogang Waste Disposal Co., Ltd., Shanghai 201302, China | | | ZHANG Jun | Shanghai Laogang Waste Disposal Co., Ltd., Shanghai 201302, China | | | YUAN Tao | School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China | | | SHEN Zhe-min | School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China | zmshen@sjtu.edu.cn |
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| Abstract: |
| In order to better understand how microorganisms affect the degradation rate of organophosphorus pesticides(OPs)in sediment in geotextile bags, we used two types of mixed microbial agents in this study, namely aerobic bacteria(i.e., Acinetobacter, Bacillus, and Saccharomyces)and anaerobic bacteria(i.e., Methanogenium, Pseudomonas, and Lactobacillus), to degrade OP-contaminated sediment in geotextile bags. The results showed that there was a clear effect on the dewatering of contaminated sediment in the geotextile bags. The water content decreased to 3.81%(aerobic flora)and 2.93%(anaerobic flora)after 25 d. The degradation rates of malathion, quetiapine, diazinon, and dimethoate were 93.17%, 93.78%, 60.91%, and 78.11%, respectively, under the influence of aerobic bacteria, while the degradation rates affected by anaerobic bacteria were 96.64%, 92.13%, 61.50%, and 83.34%, respectively. The degradation kinetics of OPs fit very well with the first-order kinetics models as the half-lives of quetiapine, diazinon, and dimethoate were shortened to 6.27 d, 17.64 d, and 10.16 d in aerobic flora and 7.39 d, 17.29 d, and 9.79 d in anaerobic flora, respectively. Through the calculation of the quantum chemical parameters ELUMO, EHOMO, and EGAP of the four OPs, the results showed that quantum chemical parameters may help to explain the degree of difficulty for microorganisms to degrade OPs in geotextile bags in terms of their molecular structure. This study not only verified that OPs can be effectively degraded by microorganisms in geotextile bags, but also provided a suggestion for a recycling method of contaminated sediment that makes use of geotextile bags. |
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