Free nitrous acid (FNA)-based pretreatment enhances methane production from waste activated sludge

Wang, Qilin, Ye, Liu, Jiang, Guangming, Jensen, Paul D., Batstone, Damien J. and Yuan, Zhiguo (2013) Free nitrous acid (FNA)-based pretreatment enhances methane production from waste activated sludge. Environmental Science and Technology, 47 20: 11897-11904. doi:10.1021/es402933b

Author Wang, Qilin
Ye, Liu
Jiang, Guangming
Jensen, Paul D.
Batstone, Damien J.
Yuan, Zhiguo
Title Free nitrous acid (FNA)-based pretreatment enhances methane production from waste activated sludge
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2013-10-15
Year available 2013
Sub-type Article (original research)
DOI 10.1021/es402933b
Volume 47
Issue 20
Start page 11897
End page 11904
Total pages 8
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2014
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
Abstract Anaerobic digestion of waste activated sludge (WAS) is currently enjoying renewed interest due to the potential for methane production. However, methane production is often limited by the slow hydrolysis rate and/or poor methane potential of WAS. This study presents a novel pretreatment strategy based on free nitrous acid (FNA or HNO2) to enhance methane production from WAS. Pretreatment of WAS for 24 h at FNA concentrations up to 2.13 mg N/L substantially enhanced WAS solubilization, with the highest solubilization (0.16 mg chemical oxygen demand (COD)/mg volatile solids (VS), at 2.13 mg HNO 2-N/L) being six times that without FNA pretreatment (0.025 mg COD/mg VS, at 0 mg HNO2-N/L). Biochemical methane potential tests demonstrated methane production increased with increased FNA concentration used in the pretreatment step. Model-based analysis indicated FNA pretreatment improved both hydrolysis rate and methane potential, with the highest improvement being approximately 50% (from 0.16 to 0.25 d-1) and 27% (from 201 to 255 L CH4/kg VS added), respectively, achieved at 1.78-2.13 mg HNO2-N/L. Further analysis indicated that increased hydrolysis rate and methane potential were related to an increase in rapidly biodegradable substrates, which increased with increased FNA dose, while the slowly biodegradable substrates remained relatively static.
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 2014 Collection
Advanced Water Management Centre Publications
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