期刊
CHEMOSPHERE
卷 148, 期 -, 页码 188-194出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.10.130
关键词
Perchlorate ClO4-; Highly concentrated; Kinetics; Environmental conditions; Perchlorate reducing bacteria (PCRB)
资金
- National Natural Science Foundation of China [51178321, 51208364]
- National Major Project of Science & Technology Ministry of China [2012ZX07403-001, 2008ZX07421-002]
- research and development Project of Ministry of Housing and Urban-Rural Development [2009-K7-4]
- Fundamental Research Funds for the Central Universities
Perchlorate reduction kinetics and effects of various environmental conditions on removal of perchlorate from synthetic water were investigated to seek high-strength perchlorate removal using mixed perchlorate reducing bacteria. Results demonstrated that perchlorate (50-1500 mg L-1) could be degraded rapidly within 28 h under the optimal conditions. The maximum specific perchlorate reduction rate (q(max)) and half saturation constant (K-s) were 0.92 mg-perchlorate (mg-dry weight)(-1) h(-1) and 157.7 mg L-1, respectively. In the ClO4--NO3- systems obvious but recoverable lags were caused in perchlorate reduction and the lag time increased with the ratio of nitrate to perchlorate concentration increasing from 0.5 to 3. While in the ClO4--SO42- systems inhibitions didn't occur until the ratio of sulfate to perchlorate concentration exceeded 10. The optimum temperature and pH value were 35 degrees C and 6.85, respectively. The optimal acetate-to-perchlorate ratio that could consume all perchlorate and acetate simultaneously was about 2. Dechloromonas, one of the most prominent perchlorate reducing bacteria, was identified as the dominant bacterium in the acclimated culture (69.33% of the whole clones). The study demonstrated that the perchlorate-acclimated mixed microorganisms can readily and efficiently realize reduction of highly concentrated perchlorate in wastewater. (C) 2015 Elsevier Ltd. All rights reserved.
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