Start-up and synergistic nitrogen removal of partial nitrification and anoxic/aerobic denitrification in membrane aerated biofilm reactor

Meichao Lan; Pingping Yang; Liang Xie; Yi Li; Jun Liu; Peng Zhang; Pengyun Zhang; Baoan Li

doi:10.1016/j.envres.2022.113901

Start-up and synergistic nitrogen removal of partial nitrification and anoxic/aerobic denitrification in membrane aerated biofilm reactor

Environ Res. 2022 Nov;214(Pt 2):113901. doi: 10.1016/j.envres.2022.113901. Epub 2022 Jul 16.

Authors

Meichao Lan¹, Pingping Yang², Liang Xie³, Yi Li⁴, Jun Liu⁵, Peng Zhang⁶, Pengyun Zhang⁷, Baoan Li⁸

Affiliations

¹ Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, PR China. Electronic address: misimogu@126.com.
² Xinjiang Petroleum Engineering Co., Ltd, Design Branch, Kelamayi, Xinjiang, 834000, PR China. Electronic address: ypping-xj@petrochina.com.cn.
³ Xinjiang Petroleum Engineering Co., Ltd, Design Branch, Kelamayi, Xinjiang, 834000, PR China. Electronic address: xieliang-xj@cnpc.com.cn.
⁴ College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, PR China. Electronic address: y.leon.li29@outlook.com.
⁵ College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, PR China. Electronic address: 15022144123@139.com.
⁶ Gansu Membrane Science and Technology Research Institute Co. Ltd., Lanzhou, Gansu, 730020, PR China. Electronic address: 21577080@qq.com.
⁷ Gansu Membrane Science and Technology Research Institute Co. Ltd., Lanzhou, Gansu, 730020, PR China. Electronic address: 530972086@qq.com.
⁸ College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, PR China. Electronic address: libaoan@nankai.edu.cn.

PMID: 35850296
DOI: 10.1016/j.envres.2022.113901

Abstract

To reduce energy consumption and improve operational stability of traditional biological nitrogen removal (BNR) system, partial nitrification and anoxic/aerobic denitrification were synergistically implemented in membrane aerated biofilm reactor (MABR) by regulating DO and pH. The results indicated that the optimal DO, pH and C/N ratio were 1-2 mg/L, 9.0 and 4-7, respectively. The corresponding average organic removal rate (ORR), total nitrogen removal rate (TNRR) and nitrite accumulation rate (NAR) reached 324 gCOD・m^-3・d^-1, 48 gN・m^-3・d^-1 and 77.70%, respectively. Extracellular polymeric substance (EPS) content in biofilm was more abundant than that in inoculated sludge. Multiple aerobic denitrifiers were detected in the biofilm with the relative abundance of 11.19%-22.71%. AQUASIM simulation implied that the distribution and proportion of substrates and bacteria were significantly affected by DO and pH regulation. Overall, this study provided some important insights in the start-up and operation of synergistic nitrogen removal process in BNR system.

Keywords: Biofilm modeling; Membrane aerated biofilm reactor; Microbial community; Operating parameter regulation; Partial nitrification and anoxic/aerobic denitrification; Synergistic nitrogen removal.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biofilms
Bioreactors / microbiology
Denitrification*
Extracellular Polymeric Substance Matrix
Nitrification*
Nitrogen
Sewage
Wastewater

Substances

Sewage
Waste Water
Nitrogen