Producing free nitrous acid - A green and renewable biocidal agent - From anaerobic digester liquor

Law, Yingyu, Ye, Liu, Wang, Qilin, Hu, Shihu, Pijuan, Maite and Yuan, Zhiguo (2015) Producing free nitrous acid - A green and renewable biocidal agent - From anaerobic digester liquor. Chemical Engineering Journal, 259 62-69. doi:10.1016/j.cej.2014.07.138

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Author Law, Yingyu
Ye, Liu
Wang, Qilin
Hu, Shihu
Pijuan, Maite
Yuan, Zhiguo
Title Producing free nitrous acid - A green and renewable biocidal agent - From anaerobic digester liquor
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
Publication date 2015-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.cej.2014.07.138
Open Access Status
Volume 259
Start page 62
End page 69
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Abstract Recent studies have shown that free nitrous acid (FNA) at parts per million is strongly biocidal to a broad range of microorganisms involved in wastewater management. Applications have been developed, where FNA is used to deactivate anaerobic sewer biofilms thus suppressing sulfide and methane production in sewers, or to lyse secondary sludge resulting in reduced sludge production and enhanced biogas production. This study examines the feasibility of producing FNA from a waste stream namely the anaerobic sludge digestion liquor, thus providing a source of FNA for the above applications within wastewater systems. Complete nitritation was achieved in a lab scale sequencing batch reactor (SBR) treating reject wastewater. Under stable operation, the system sustained more than 90% conversion of the 1.0 and 0.8g NH4 +-N/L contained in the synthetic and real digester liquor, respectively, to nitrite. Each liter of this nitrite rich effluent could be acidified to pH 2 with only 66 mmol of H+, due to the low level of alkalinity in the effluent. This converts almost all of the nitrite to FNA providing an ample source of FNA for sewer and sludge pretreatment applications. Despite the high nitrite concentration in the reactor, minimal N2O was produced with an emission factor of 0.08% of the ammonium nitrogen converted. Finally, an economical assessment of a theoretical full-scale installation for FNA production was conducted and compared with the costs of producing this FNA from a commercial nitrite supply.
Keyword Anaerobic digester liquor
Free nitrous acid (FNA)
Nitrous oxide
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
Advanced Water Management Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
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