Achieving Stable Mainstream Nitrogen Removal via the Nitrite Pathway by Sludge Treatment Using Free Ammonia

Wang, Qilin, Duan, Haoran, Wei, Wei, Ni, Bing-Jie, Laloo, Andrew and Yuan, Zhiguo (2017) Achieving Stable Mainstream Nitrogen Removal via the Nitrite Pathway by Sludge Treatment Using Free Ammonia. Environmental Science and Technology, 51 17: 9800-9807. doi:10.1021/acs.est.7b02776


Author Wang, Qilin
Duan, Haoran
Wei, Wei
Ni, Bing-Jie
Laloo, Andrew
Yuan, Zhiguo
Title Achieving Stable Mainstream Nitrogen Removal via the Nitrite Pathway by Sludge Treatment Using Free Ammonia
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 1520-5851
0013-936X
Publication date 2017-08-03
Year available 2017
Sub-type Article (original research)
DOI 10.1021/acs.est.7b02776
Open Access Status Not yet assessed
Volume 51
Issue 17
Start page 9800
End page 9807
Total pages 8
Place of publication Washington, United State
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
Abstract Biological nitrogen removal through the nitrite pathway (NH → NO → N) is favorable for wastewater treatment plants without sufficient carbon sources. This study demonstrates an innovative approach for attaining the nitrite pathway based on sludge treatment using free ammonia (FA, i.e., NH). This approach is based on our innovative discovery in this study that FA at 210 mg NH-N/L is far less biocidal to ammonium-oxidizing bacteria (AOB) than to nitrite-oxidizing bacteria (NOB). A total of 22% of the activated sludge from the sequencing batch reactor (SBR) receiving synthetic domestic wastewater was treated in an FA treatment unit at 210 mg NH-N/L for 1 day. The FA-treated sludge was afterward recirculated back to the SBR. A nitrite accumulation ratio of above 90% was quickly achieved (in 40 days) and maintained stably in the SBR, indicating the establishment of the nitrite pathway. The NOB population and activity after implementing FA treatment was less than 5% of those without FA treatment, suggesting the washout of NOB. In contrast, the AOB population and activity in the SBR were not affected. The nitrogen-removal performance was significantly improved after incorporating the FA approach. The FA approach is a closed-loop approach and is economically and environmentally attractive.
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP170102812
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Advanced Water Management Centre Publications
 
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