N2O and NO emission from a biological aerated filter treating coking wastewater: Main source and microbial community

JOURNAL OF CLEANER PRODUCTION

卷:213

Article

Zheng, Maosheng¹  Zhou, Nan¹  Liu, Shufeng²  Dang, Chenyuan²  Liu, Yongxin³  He, Shishi¹  Zhao, Yijun¹  Liu, Wen²  Wang, Xiangke¹ 

[1] North China Elect Power Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China

[2] Peking Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China

[3] Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Plant Genom, Beijing 100101, Peoples R China

关键词: Nitrous oxide;    Nitric oxide;    Biological aerated filter;    Coking wastewater;    Short-cut nitrification and denitrification;   

DOI  :  10.1016/j.jclepro.2018.12.182

来源: Elsevier

【 摘 要 】

Nitrous oxide (N2O) and nitric oxide (NO) emissions from domestic wastewater treatment had been widely investigated due to their severe greenhouse effect and stratospheric ozone depletion. Researches concerning N2O and NO emissions from industrial wastewater treatment which usually contain high concentrations of nitrogen and refractory organics were still limited. In this study, N2O and NO emissions from a biological aerated filter (BAF) for coking wastewater treatment were investigated that achieved efficient nitrogen and chemical oxygen demand (COD) removal efficiency through short-cut nitrification and denitrification. Notably, emission factor of N2O and NO reached 23.58% and 0.09% respectively, much higher than those emitted from most domestic wastewater treatment plants. Moreover, batch experiments revealed that nitrifier denitrification contributed as high as 97.17% and 93.89% of the total generated N2O and NO, which was supposed to be the main source of green-house gases (GHGs) during coking wastewater treatment. The inhibition of denitrifying reductase by the toxic components in coking wastewater and the severe nitrite accumulations were key factors promoting the high emission of N2O and NO. Microbial community analysis based on high throughput sequencing of 16S rRNA gene revealed that ammonia-oxidizing bacteria and denitrifying bacteria distributed abundantly in the BAF reactor, while nitrite-oxidizing bacteria was almost absent. The huge imbalance between NO and N2O reductase was an underlying explanation for the high N2O emission in the present coking wastewater treatment according to Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) result. This study is of great significance to understanding the high N2O and NO emission and developing the control strategy when treating industrial wastewater with high-strength nitrogen and refractory organics. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free