Impact of soluble organic matter and particulate organic matter on anammox system: Performance, microbial community and NO production.

J Environ Sci (China)

Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China. Electronic address:

Published: February 2023

In this study, the effects of soluble readily biodegradable COD (sCOD) and particulate slowly biodegradable COD (pCOD) on anammox process were investigated. The results of the long-term experiment indicated that a low sCOD/N ratio of 0.5 could accelerate the anammox and denitrification activity, to reach as high as 84.9%±2.8% TN removal efficiency. Partial denitrification-anammox (PDN/anammox) and denitrification were proposed as the major pathways for nitrogen removal, accounting for 91.3% and 8.7% of the TN removal, respectively. Anammox bacteria could remain active with high abundance of anammox genes to maintain its dominance. Candidatus Kuenenia and Thauera were the predominant genera in the presence of organic matter. Compared with sCOD, batch experiments showed that the introduction of pCOD had a negative effect on nitrogen removal. The contribution of denitrification to nitrogen removal decreased from approximately 14% to 3% with increasing percentage of pCOD. In addition, the analysis result of the process data using an optimized ASM1 model indicated that high percentage of pCOD resulted in serious NO emission (the peak value up to 0.25 mg N/L), which was likely due to limited mass diffusion and insufficient available carbon sources for denitrification. However, a high sCOD/N ratio was beneficial for alleviating NO accumulation.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jes.2021.11.007DOI Listing

Publication Analysis

Top Keywords

organic matter
12
nitrogen removal
12
biodegradable cod
8
scod/n ratio
8
percentage pcod
8
anammox
5
removal
5
impact soluble
4
soluble organic
4
matter particulate
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!