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Title: Free nitrous acid inhibition on carbon storage microorganisms: Accumulated inhibitory effects and recoverability
Authors: Ganda, Lily
Zhou, Yan
Lim, Choon-Ping
Liu, Yu
Ng, Wun Jern
Keywords: AB process
Carbon storage
Free nitrous acid
Glycogen accumulating organism
Nitrite shortcut
Issue Date: 2015
Source: Ganda, L., Zhou, Y., Lim, C.-P., Liu, Y., & Ng, W. J. (2016). Free nitrous acid inhibition on carbon storage microorganisms: Accumulated inhibitory effects and recoverability. Chemical Engineering Journal, 287, 285-291.
Series/Report no.: Chemical Engineering Journal
Abstract: Recent research has shed light on utilization of carbon storage microorganisms in the A-stage of AB process for higher methane generation and resource recovery potential. Typically, organic matters are entrapped into biomass in the A-stage and subsequently channeled to the anaerobic digester for energy/resource recovery. In the following B-stage, nitrite shortcut strategy is often implemented to achieve low energy nitrogen removal. In this study, an enriched glycogen accumulating organism (GAO) culture was deployed as the A-stage carbon storage microorganisms to enhance the removal of soluble COD. This study aimed (1) to address the challenge arising from incidental nitrite leakage into the A-stage tank, leading to free nitrous acid (FNA) inhibition; and (2) to evaluate the continued (henceforth referred to as ‘accumulated’) inhibitory effects on GAOs’ carbon metabolisms under the subsequent FNA-free condition. Upon FNA exposure, dynamics in carbon storage mechanisms were obtained and could be linked to higher cellular energy expenditure for detoxification activity. The inhibition on carbon transformation, however, was found to be reversible, suggesting the robustness of GAO towards FNA inhibition and its potential application in the nitrite-shortcut AB process.
ISSN: 1385-8947
DOI: 10.1016/j.cej.2015.11.027
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Rights: © 2015 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Chemical Engineering Journal, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles

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