DOI: 10.1016/j.watres.2020.115501
论文题名: Mechanisms of nitrous oxide emission during photoelectrotrophic denitrification by self-photosensitized Thiobacillus denitrificans
作者: Chen M. ; Zhou X. ; Chen X. ; Cai Q. ; Zeng R.J. ; Zhou S.
刊名: Water Research
ISSN: 431354
出版年: 2020
卷: 172 语种: 英语
英文关键词: FNA inhibition
; Nitrate pollutant
; Nitrous oxide emission
; Photoelectrotrophic denitrification
; Reactive oxidative species
Scopus关键词: Cadmium sulfide
; Gas emissions
; II-VI semiconductors
; Nitrates
; Nitrogen oxides
; Sulfur compounds
; Transcription
; Denitrification process
; Down-regulation
; Free nitrous acid (FNA)
; Hydroxyl radicals
; Nitrate reduction
; Nitrous oxide emissions
; Reactive oxidative species
; Thiobacillus denitrificans
; Denitrification
; cadmium sulfide
; hydrogen peroxide
; hydroxyl radical
; nitrate
; nitrous oxide
; oxidoreductase
; reactive oxygen metabolite
; superoxide
; nitric acid derivative
; nitrous oxide
; denitrification
; hydrogen peroxide
; nitrous oxide
; oxidative stress
; photooxidation
; wastewater
; Article
; controlled study
; denitrification
; down regulation
; enzyme inhibition
; genetic transcription
; nitrous oxide emission
; nonhuman
; priority journal
; reduction (chemistry)
; Thiobacillus denitrificans
; Thiobacillus
; Thiobacillus denitrificans
; Denitrification
; Hydrogen Peroxide
; Nitrates
; Nitrous Oxide
; Thiobacillus
英文摘要: Photoelectrotrophic denitrification (PEDeN) using bio-hybrids has the potential to remove nitrate (NO3−) from wastewater in an economical and sustainable way. As a gas of global concern, the mechanisms of nitrous oxide (N2O) emissions during this novel process remain unclear. Herein, a self-photosensitized bio-hybrid, i. e., Thiobacillus denitrificans-cadmium sulfide, was constructed and the factors affecting N2O emissions during PEDeN by the bio-hybrids were investigated. The system was sensitive to the input NO3−-N and NO2−-N, resulting in changes in the N2O/(N2+N2O) ratio from 1% to 95%. In addition to free nitrous acid (FNA), reactive oxidative species (ROS) were a unique factor affecting N2O emission during PEDeN. Importantly, the N2O reduction step exhibited greater susceptibility to the ROS than nitrate reduction step. The contributions of hydrogen peroxide (H2O2), superoxides (O2−•), hydroxyl radicals (•OH) and FNA to the inhibition of N2O reduction were >15.0%, >5.4%, 1.3%, and <70.2%, respectively for a reduction of 13.5 mg/L NO3−-N. A significant down-regulation of the relative transcription of the gene nosZ demonstrated that the inhibition of N2O reductase occurred at the gene level. This finding has important implications not only for mitigating N2O emissions during the PEDeN process but also for encouraging a reexamination process of N2O emissions in nature, particularly in systems in which ROS are present during the denitrification process. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158620
Appears in Collections: 气候变化与战略
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作者单位: Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
Recommended Citation:
Chen M.,Zhou X.,Chen X.,et al. Mechanisms of nitrous oxide emission during photoelectrotrophic denitrification by self-photosensitized Thiobacillus denitrificans[J]. Water Research,2020-01-01,172