Effects of voltage on sulfadiazine degradation and the response of sul genes and microbial communities in biofilm-electrode reactors

Effects of voltage on sulfadiazine degradation and the response of sul genes and microbial... Few studies have been performed on both the potential and the risks of biofilm-electrode reactors (BERs) with regard to the removal of antibiotics. This study used 33 BERs to investigate the removal rate and degradation pathway of sulfadiazine (SDZ). Furthermore, the effects of additional electrons on sul genes and microbial community composition were examined. The study found that rapid elimination rates of 20mg/L SDZ were observed during the first 3h with different DC voltage rates. Even high concentrations (160mg/L) could be rapidly removed after 24h of system operation. Pyrimidin-2ylsulfamic acid and aniline were noted to be principal products, and an SDZ degradation mechanism was proposed. The study identified 41 species of microorganism; based on bacterial community divergence caused by voltage, and six samples were grouped into four clusters. The relative abundances of sul genes from biofilm were in the following order: sulII > sulIII > sulI > sulA. The sulI, sulII, and sulA genes were enhanced with electrical stimulation in the cathode layer. It is noteworthy that sul genes were not detected in the effluent after 24h of operation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecotoxicology and Environmental Safety Elsevier

Effects of voltage on sulfadiazine degradation and the response of sul genes and microbial communities in biofilm-electrode reactors

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Inc.
ISSN
0147-6513
eISSN
1090-2414
D.O.I.
10.1016/j.ecoenv.2018.01.016
Publisher site
See Article on Publisher Site

Abstract

Few studies have been performed on both the potential and the risks of biofilm-electrode reactors (BERs) with regard to the removal of antibiotics. This study used 33 BERs to investigate the removal rate and degradation pathway of sulfadiazine (SDZ). Furthermore, the effects of additional electrons on sul genes and microbial community composition were examined. The study found that rapid elimination rates of 20mg/L SDZ were observed during the first 3h with different DC voltage rates. Even high concentrations (160mg/L) could be rapidly removed after 24h of system operation. Pyrimidin-2ylsulfamic acid and aniline were noted to be principal products, and an SDZ degradation mechanism was proposed. The study identified 41 species of microorganism; based on bacterial community divergence caused by voltage, and six samples were grouped into four clusters. The relative abundances of sul genes from biofilm were in the following order: sulII > sulIII > sulI > sulA. The sulI, sulII, and sulA genes were enhanced with electrical stimulation in the cathode layer. It is noteworthy that sul genes were not detected in the effluent after 24h of operation.

Journal

Ecotoxicology and Environmental SafetyElsevier

Published: Apr 30, 2018

References

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