期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 16, 页码 11277-11287出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c00062
关键词
tetrabromobisphenol A; anaerobic digestion; hormesis-like effect; environmental risks; bisphenol A; brominated flame retardants
资金
- National Natural Science Foundation of China [52000063]
- Natural Science Foundation of Hunan Province of China [2021JJ40080]
- Science and Technology Innovation Program of Hunan Province [2021RC4024]
TBBPA exhibits hormesis-like effects on anaerobic digestion, affecting methane production. It binds with proteins in the extracellular polymeric substances of anaerobes and induces an increase in reactive oxygen species. Different anaerobes show varied tolerance to TBBPA.
Tetrabromobisphenol A (TBBPA) has extensive applications in various fields; its release into ecosystems and the potential toxic effects on organisms are becoming major concerns. Here, we investigated the effects of TBBPA on anaerobic digestion, whose process is closely related to the carbon cycles under anaerobic conditions. The results revealed that TBBPA exhibited dose-dependent hormesis-like effects on methane production from glucose, i.e., the presence of 0.1 mg/L TBBPA increased the methane production rate by 8.79%, but 1.0-4.0 mg/L TBBPA caused 3.45-28.98% of decrement. We found that TBBPA was bound by the tyrosine-like proteins of the extracellular polymeric substances of anaerobes and induced the increase of reactive oxygen species, whose slight accumulation stimulated the metabolism activities but high accumulation increased the apoptosis of anaerobes. Owing to the differences between individual anaerobes in tolerance, TBBPA at 0.1 mg/L stimulated the acidogenesis and hydrogenotrophic methanogenesis, whereas higher levels (i.e., 1.0-4.0 mg/L) severely restrained all of the processes of acidogenesis, acetogenesis, and methanogenesis. Along with the accumulation of bisphenol A (BPA) produced from TBBPA by Longilinea sp. and Pseudomonas sp., the methanogenic pathway was partly shifted from acetate-dependent to hydrogen-dependent direction, and the activities of carbon monoxide dehydrogenase and acetyl-CoA decarbonylase/synthase were inhibited, while acetate kinase and F420 were hormetically affected. These findings elucidated the mechanism of anaerobic syntrophic consortium responses to TBBPA, supplementing the potential environmental risks of brominated flame retardants.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据