Enhanced methane production from algal digestion using free nitrous acid pre-treatment

Bai, Xue, Lant, Paul A., Jensen, Paul D., Astals, Sergi and Pratt, Steven (2016) Enhanced methane production from algal digestion using free nitrous acid pre-treatment. Renewable Energy, 88 383-390. doi:10.1016/j.renene.2015.11.054

Author Bai, Xue
Lant, Paul A.
Jensen, Paul D.
Astals, Sergi
Pratt, Steven
Title Enhanced methane production from algal digestion using free nitrous acid pre-treatment
Journal name Renewable Energy   Check publisher's open access policy
ISSN 0960-1481
Publication date 2016-04-01
Sub-type Article (original research)
DOI 10.1016/j.renene.2015.11.054
Open Access Status Not Open Access
Volume 88
Start page 383
End page 390
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
The methane yield from the digestion of algae is typically much lower than the theoretical methane yield, and lower than yields reported for other organic substrates. This study presents a novel free nitrous acid (FNA) pre-treatment technique to improve methane production from algal biomass. The methane production yield through anaerobic digestion was found to be dramatically enhanced by FNA pre-treatment (2.31 mg HNO2–N L−1), with a 51% increase in the methane yield (from 161 to 250 L CH4 per kg VS added). A two substrate model was used to describe the apparent presence of rapid and slowly degradable material. Model-based analysis revealed that with FNA pre-treatment (2.31 mg HNO2–N L−1), the availability of both rapid and slowly biodegradable substrates were increased. Higher levels of nitrite (159 and 1006 mg N L−1) had an inhibitory/toxic effect. For this reason, coupled with the fact that denitrification of nitrite consumes organic substrate, it is concluded that pre-treatment liquor should be removed before digestion.
Keyword Free nitrous acid
Anaerobic digestion
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Advanced Water Management Centre Publications
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Created: Tue, 08 Dec 2015, 22:58:06 EST by Sergi Astals-garcia on behalf of Advanced Water Management Centre