In:
Environmental Science: Water Research & Technology, Royal Society of Chemistry (RSC), Vol. 9, No. 1 ( 2023), p. 265-273
Abstract:
The PN/A MABR has attracted much attention as a promising low-cost nitrogen removal technology with a lower carbon footprint. This study explored the minimum C/N ratio of the PN/A MABR. It was found that low lumen pressure (2–5 kPa) was beneficial for a MABR to achieve a partial nitrification process. Also, the ANAMMOX process can be coupled with partial nitrification in the MABR under low C/N conditions ( 〈 1.5). The total nitrogen removal efficiency (TNRE) can be seriously affected by DO under a low C/N ratio, even with minor fluctuations. When the C/N ratio was 3–4, the PN/A MABR can achieve a higher TNRE and the effluent water quality was more stable. The pH difference (ΔpH) between the influent and the effluent can reflect the influence of C/N and dissolved oxygen (DO) on the PN/A process. ΔpH was negatively correlated with the C/N ratio and positively correlated with DO. This study also found that Nitrosomonas , Nitrospira , Denitratisoma , Thauera , Candidatus Kuenenia , and Candidatus Brocadia played important roles in the synergy of nitrogen removal in the PN/A MABR by microbial population structure analysis using 16S rRNA and metagenomic sequencing identification techniques. The research results laid an application foundation for low C/N ratio sewage nitrogen removal and provided a technical reference for wastewater treatment plants (WWTPs) that treat municipal wastewater with a PN/A MABR.
Type of Medium:
Online Resource
ISSN:
2053-1400
,
2053-1419
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
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