AI Article Synopsis
- Nitrous oxide (N₂O) emissions during biological nitrogen removal are primarily influenced by AOB denitrification, which needs to be controlled to minimize its release.
- To achieve this, maintaining dissolved oxygen (DO) levels around 2 mg/L and extending solid retention time (SRT) to 20 days can help prevent the accumulation of N₂O.
- The review outlines the mechanisms behind N₂O emissions and offers strategies for managing these emissions effectively.
Article Abstract
As a direct carbon emission source, the amount of nitrous oxide (N, which is actually caused by AOB denitrification. To control the NO emission during biological N-removal, complete HND and NO accumulation for AOB denitrification should be avoided to a large extent. For this purpose, DO in aerobic tanks should be controlled at a normal level (approximately 2 mg·L), and solid retention time (SRT) should be extended, up to 20 d, which would avoid accumulating NO for AOB denitrification. Additionally, external carbon should be supplemented in time to promote HDN approaching the end, N. This review summarizes the mechanisms of all the mentioned NO emission pathways and discusses the control strategies of NO emission according to the associated mechanisms.
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| http://dx.doi.org/10.13227/j.hjkx.202204041 | DOI Listing |
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