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Title: Continuous abatement of methane coupled with ectoine production by Methylomicrobium alcaliphilum 20Z in stirred tank reactors: A step further towards greenhouse gas biorefineries
Authors: Cantera, Sara
Lebrero Fernández, Raquel
Rodríguez Rodríguez, Elisa
García Encina, Pedro A.
Muñoz Torre, Raúl
Issue Date: 2017
Publisher: Elsevier
Citation: Journal of Cleaner Production, May 2017, vol 152, p. 134-141
Abstract: This study demonstrates for the first time the feasibility of producing ectoine (a high added value osmoprotectant intensively used in the cosmetic industry) during the continuous abatement of diluted emissions of methane by Methylomicrobium alcaliphilum 20Z in stirred tank reactors under non-sterile conditions. An increase in NaCl concentration in the cultivation broth from 3 to 6% increased the intra-cellular ectoine yield by a factor of 2 (from 16.5 to 37.4 mg ectoine (g biomass)−1), while high stirring rates (600 rpm) entailed a detrimental cellular stress and 3 times lower ectoine yields (5.6 mg ectoine (g biomass)−1) compared to process operation at 300 rpm. An increase in Cu2+ concentration from 0.05 to 25 μM enhanced methane abatement by a factor of 2 (up to elimination capacities of 24.5 g m−3 h−1), did not enhance intra-cellular ectoine production but promoted the excretion to the cultivation broth of 20% of the total ectoine synthesized regardless of the NaCl concentration and stirring rate. The results obtained by culture hybridization with the specific probe Mγ1004 showed that Methylomicrobium alcaliphilum 20Z accounted for more than 80% of the total bacterial population in most experimental runs. This work confirmed the technical feasibility of a new generation of biorefineries based on the abatement of diluted CH4 emissions using extremophile methanotrophs.
Peer Review: SI
DOI: 10.1016/j.jclepro.2017.03.123
Sponsor: Ministerio de Economía y Competitividad (CTM2015-70442-R project and Red NOVEDAR)
Unión Europea-FEDER Funding Program y Junta de Castilla y León (hD Grant contract Nº E-47-2014-0140696 y UIC71)
Language: eng
Rights: info:eu-repo/semantics/embargoedAccess
Appears in Collections:GTA - Artículos de revista
DEP48 - Artículos de revista

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