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| Influence of nanoscale zero-valent iron (nZVI) on resistance character of tetracycline resistant bacteria |
| LU Xian1,2, GUO Mei-ting1,2, ZHANG Wei-xian1,2 |
1. State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China;
2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract Effect of nanoscale zero-valent iron (nZVI) on tetracycline resistant bacteria in wastewater was investigated. Specifically drug resistance, gene transfer, microbial growth and separation in municipal wastewater were examined. Tetracycline resistant bacteria were treated with nZVI particles under a verity of experimental conditions such as concentration, reaction time, availability to dissolved oxygen and redox state. Experimental results suggest that nZVI was effective for the inactivation of tetracycline resistant bacteria when nZVI concentration is over 5,000mg/L, or reaction time was over 12hours under anaerobic condition. nZVI could also trigger rapid decrease on the antibiotic resistance. Furthermore, addition of 50mg/L nZVI could enhance the transfer efficiency by 215%. Results demonstrate that nZVI was highly reactive in wastewater and there was an urgent need to understand the influence of nZVI on microbial drug resistance.
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Received: 20 May 2016
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