| Title: | Screening of xylene degrading bacteria and optimization of their degradation characteristics in heavily polluted areas |
| Author(s): | Zhang J; Fan X; Zhang H; Tang Y; Zhou J; Wang X; Yuan Z; |
| Address: | "School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, People's Republic of China. Tianjin Key laboratory of Aquatic Science and Technology, Tianjin, People's Republic of China. Municipal Experimental teaching Demonstration Center of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, People's Republic of China. Tianjin International Joint Research and Development Center, Tianjin, People's Republic of China. Tianjin Enshui Environmental Protection Technology Co.Ltd., Tianjin, People's Republic of China" |
| DOI: | 10.1080/09593330.2022.2064241 |
| ISSN/ISBN: | 1479-487X (Electronic) 0959-3330 (Linking) |
| Abstract: | "Aiming at the problems of high xylene concentration and difficult removal in heavily polluted areas, high-efficient degrading bacteria of volatile organic compounds (VOCs) xylene in heavily polluted areas were selected and screened from sewage sludge, and their degradation characteristics were studied. The response surface methodology (RSM) optimized the optimal degradation conditions. The results showed that the screened degrading strain was identified as Klebsiella by the 16SrDNA technology and named H-16. During the start-up phase of the reactor, the removal rate of xylene by strain H-16 fluctuated, and it was stable above 71.3% for 150 min. At 40 degrees C, the degradation rate is the highest, reaching 63.25%. With an increasing inoculum amount of strain H-16, the degradation rate of xylene gradually increased, and the degradation rate could reach 86.1% when the inoculation amount was 25%. A neutral environment was more conducive to the degradation and removal of xylene. Through the analysis of the model and RSM, the optimal conditions for the degradation of xylene by H-16 were obtained: 38.89 degrees C, pH 6.94 and 18.07%. GC-MS results showed that the possible degradation pathway of xylene began with demethylation, formation of pentene diacid by benzene ring cleavage, and finally oxidation to generate CO(2) and H(2)O" |
| Keywords: | "*Xylenes/metabolism Biodegradation, Environmental Bacteria/metabolism *Volatile Organic Compounds Oxidation-Reduction Xylene degradation bacteria degradation characteristics response surface methodology select;" |
| Notes: | "MedlineZhang, Jinxuan Fan, Xiaodan Zhang, Hao Tang, Yinbing Zhou, Jiaying Wang, Xueqi Yuan, Zhengtong eng England 2022/04/09 Environ Technol. 2023 Sep; 44(23):3563-3574. doi: 10.1080/09593330.2022.2064241. Epub 2022 Apr 25" |
