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Impact of internal recycle ratio on nitrous oxide generation from anaerobic/anoxic/oxic biological nitrogen removal process
Yan, Xu; Han, Yunping; Li, Qilu; Sun, Jianhui; Su, Xianfa
2016-02-15
Source PublicationBIOCHEMICAL ENGINEERING JOURNAL
Volume106Issue:0Pages:11-18
AbstractTo evaluate the effects of internal recycle ratio on nitrous oxide (N2O) generation, we set up three laboratory-scale anaerobic-anoxic-oxic (A(2)O) wastewater treatment processes, with internal recycle ratios of 100%, 200%, and 300%, respectively. Total nitrogen (TN) removal was markedly enhanced from 45.8% to 61.9%, as the internal recycle ratio increased from 100% to 300%. N2O generation was increased from 3.47 to 9.81 x 10(-2) mg/L during the treatment process, with the anoxic section showing the largest N2O increment from denitrification. This phenomenon is attributed to the increased amount of nitrate (NO3--N) substrate available for denitrification, due to the increased volume of internal recycle liquid, as well as the increased amount of oxygen, which could restrain the activity of nitrous oxide reductase brought to the anoxic section. Nitrous oxide reductase was more sensitive to oxygen than nitrate and nitrite reductases. Microorganism analysis indicated that the population of nosZ gene-containing bacteria was only slightly affected by the recycle ratio. However, the number of nosZ gene copies decreased as the internal recycle ratio increased from 100% to 300%; this result reveals noticeable decreases in the denitrification capacity of the system for reducing N2O to N-2. (C) 2015 Elsevier B.V. All rights reserved.
Department环境化学与生态毒理学国家重点实验室
KeywordWastewater Treatment Anaerobic-anoxic-oxic Process Biological Nitrogen Removal Internal Recycle Ratio Greenhouse Gas Nitrous Oxide
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Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/35872
Collection环境化学与生态毒理学国家重点实验室
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GB/T 7714
Yan, Xu,Han, Yunping,Li, Qilu,et al. Impact of internal recycle ratio on nitrous oxide generation from anaerobic/anoxic/oxic biological nitrogen removal process[J]. BIOCHEMICAL ENGINEERING JOURNAL,2016,106(0):11-18.
APA Yan, Xu,Han, Yunping,Li, Qilu,Sun, Jianhui,&Su, Xianfa.(2016).Impact of internal recycle ratio on nitrous oxide generation from anaerobic/anoxic/oxic biological nitrogen removal process.BIOCHEMICAL ENGINEERING JOURNAL,106(0),11-18.
MLA Yan, Xu,et al."Impact of internal recycle ratio on nitrous oxide generation from anaerobic/anoxic/oxic biological nitrogen removal process".BIOCHEMICAL ENGINEERING JOURNAL 106.0(2016):11-18.
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