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

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_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Yang XL,Zhang S,Li H,Zhang LM,Song HL,Wang YW

doi

10.1016/j.ecoenv.2018.01.016

subject

Has Abstract

pub_date

2018-04-30 00:00:00

pages

272-278

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(18)30025-3

journal_volume

151

pub_type

杂志文章

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