Journal
WATER RESEARCH
Volume 211, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2021.118027
Keywords
Simultaneous shortcut nitrification and denitrification; Nitrogen removal; Hybrid membrane aerated biofilm reactor; Membrane bio-fouling; Response surface methodology
Funding
- Basic Scientific Research Expenses of Central Universities [N2003019]
- Young and middle-aged scientific and technological innovation talents program of Shenyang [RC200538]
- National Key R&D Program of China [2020YFC1806402]
- National Natural Science Foundation of China [21677030]
- Major key and core technology research project (di-rection of water pollution control industry chain), Science and Tech-nology Plan of Shenyang in 2020 [20-202-437]
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In this study, simultaneous shortcut nitrification and denitrification (SND) was achieved in the hybrid membrane aerated biofilm reactor (H-MBfR) for treating low COD/N ratio wastewater. By controlling the dissolved oxygen to achieve SND, high removal efficiencies of NH4+-N, COD and TN were achieved. Microbial community analysis showed that the influent COD/N ratio had a significant influence on the microbial community structure, particularly at a COD/N ratio of 4.3. The analysis of membrane bio-fouling indicated that H-MBfR had lower extracellular polymeric substance (EPS) and mixed liquor suspended solids (MLSS), which is beneficial for long-term operation.
The residues of nitrogen contaminants due to insufficient organic carbon sources in sewage has always been the main problem faced by wastewater treatment plants in the process of nitrogen removal. In this study, simultaneous shortcut nitrification and denitrification (SND) was achieved in the hybrid membrane aerated biofilm reactor (H-MBfR) for treating low COD/N ratio (-x223C 4: 1) wastewater. The effects of the aeration pressure and the influent COD/N ratio in H-MBfR were investigated and further optimized by the response surface methodology (RSM). By controlling the dissolved oxygen to achieve SND, the removal efficiencies of NH4+-N, COD and TN of low COD/N ratio wastewater reached maximum values of 95.52%, 96.61% and 72.23%, respectively. Microbial community analysis showed that the influent COD/N ratio had an obvious influence on the microbial community structure. In particular, ammonia oxidizing bacteria (AOB) and denitrifying bacteria had a good commensalism when the COD/N ratio was 4.3. Compared to control reactor, the analysis of membrane bio-fouling showed that H-MBfR has a lower amount of extracellular polymeric substance (EPS) on membrane and a low concentration of MLSS in bulk liquid, which is helpful for the longer-term operation of HMBfR.
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