Ionic copper strengthens the toxicity of tetrabromobisphenol A (TBBPA) to denitrification by decreasing substrate transport and electron transfer
| Autor: | Xiong Zheng, Yinguang Chen, Yunyi Zha, Jing Meng, Rui Wan, Lei Wang, Geng Yang, Xiaoxiao Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Denitrification Health Toxicology and Mutagenesis Polybrominated Biphenyls 0211 other engineering and technologies Electron donor Electrons 02 engineering and technology 010501 environmental sciences Bacterial growth 01 natural sciences Electron Transport chemistry.chemical_compound Denitrifying bacteria Electron transfer Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Flame Retardants 021110 strategic defence & security studies Substrate (chemistry) Pollution Electron transport chain chemistry Environmental chemistry Tetrabromobisphenol A Copper |
| Zdroj: | Journal of hazardous materials. 416 |
| ISSN: | 1873-3336 |
| Popis: | Increasing electrical and electronic waste have raised concerns about the potential toxicity of brominated flame retardants (BFRs) and heavy metals (HMs). However, few studies have focused on the combined effect of BFRs and HMs on microorganisms, especially denitrifying bacteria, which have an essential role in N cycles and N2O emission. Herein, we investigate the combined effect of tetrabromobisphenol A (TBBPA) and Cu on model denitrifying bacteria. A further 24.5% decline in N removal efficiency was observed when 0.05 mg/L Cu were added into a denitrifying system containing 0.75 mg/L TBBPA. Further study demonstrated that Cu heightened the toxicity of TBBPA to denitrification via following aspects: (1) Cu stimulated EPS secretion induced by TBBPA during denitrification, blocked the transmembrane transport of glucose, which caused insufficient carbon substrate for bacteria growth and electron provision; (2) Cu further suppressed key denitrifying enzymes’ activity and down-regulated genes involving electron transport induced by TBBPA, led to the decrease of electron transport activity. Finally, the decrease of bacterial growth, insufficient electron donor, and lower electron transport activity caused the synergetic toxic effect of TBBPA and Cu on denitrification. Overall, the present study provides new insights into the combined effect of BFRs and HMs on microorganisms. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect