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Kinetic study on anaerobic oxidation of methane coupled to denitrification.

Abstract：

:Monod kinetic parameters provide information required for kinetic analysis of anaerobic oxidation of methane coupled to denitrification (AOM-D). This information is critical for engineering AOM-D processes in wastewater treatment facilities. We first experimentally determined Monod kinetic parameters for an AOM-D enriched culture and obtained the following values: maximum specific growth rate (μmax) 0.121/d, maximum substrate-utilization rate (qmax) 28.8mmol CH4/g cells-d, half maximum-rate substrate concentration (Ks) 83μΜ CH4, growth yield (Y) 4.76gcells/mol CH4, decay coefficient (b) 0.031/d, and threshold substrate concentration (Smin) 28.8μM CH4. Clone library analysis of 16S rRNA and mcrA gene fragments suggested that AOM-D reactions might have occurred via the syntrophic interaction between denitrifying bacteria (e.g., Ignavibacterium, Acidovorax, and Pseudomonas spp.) and hydrogenotrophic methanogens (Methanobacterium spp.), supporting reverse methanogenesis-dependent AOM-D in our culture. High μmax and qmax, and low Ks for the AOM-D enrichment imply that AOM-D could play a significant role in mitigating atmospheric methane efflux. In addition, these high kinetic features suggest that engineered AOM-D systems may provide a sustainable alternative to nitrogen removal in wastewater treatment.

journal_name

Enzyme Microb Technol

journal_title

Enzyme and microbial technology

authors

Yu H,Kashima H,Regan JM,Hussain A,Elbeshbishy E,Lee HS

doi

10.1016/j.enzmictec.2017.05.005

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

47-55

eissn

0141-0229

issn

1879-0909

pii

S0141-0229(17)30097-2

journal_volume

104

pub_type

杂志文章

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