Bacterial reduction of highly concentrated perchlorate: Kinetics and influence of co-existing electron acceptors, temperature, pH and electron donors

Chemosphere
Yanping ZhuJianhong Xu

Abstract

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 (qmax) and half saturation constant (Ks) 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(-)-SO4(2-) systems inhibitions didn't occur until the ratio of sulfate to perchlorate concentration exceeded 10. The optimum temperature and pH value were 35 °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...Continue Reading

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Citations

Mar 15, 2016·Applied Microbiology and Biotechnology·Ji-Hyun NamDeokjin Jahng
Jan 9, 2019·Environmental Science and Pollution Research International·Dongyang LiZhifei Ma
Jan 29, 2017·Environmental Monitoring and Assessment·R CalderónP Palma
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Apr 26, 2019·Environmental Science and Pollution Research International·Li HeQi Yang
Jul 22, 2019·Journal of Hazardous Materials·Han-Wen ChenDong-Feng Liu

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