Biological oxidation of choline‐based ionic liquids in sequencing batch reactors

BACKGROUND Ionic liquids (ILs) are salts consisting of an organic cation and an organic or inorganic anion that are potential use for organic synthesis, biomass conversion, gas absorption, polymerization, metal extraction and lubrication. We examined the biodegradability of choline chloride (Choline...

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Published inJournal of chemical technology and biotechnology (1986) Vol. 95; no. 4; pp. 922 - 931
Main Authors Mena, Ismael F, Diaz, Elena, Rodriguez, Juan J, Mohedano, Angel F
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.04.2020
Wiley Subscription Services, Inc
Subjects
Acclimation
Acclimatization
Acetic acid
Activated sludge
Anions
Batch reactors
Biodegradability
Biodegradation
Biological oxidation
Chemical oxygen demand
Chemical synthesis
Chlorides
Choline
Degradation
Depletion
Ethanol
Gas absorption
Intermediates
ionic liquid
Ionic liquids
Ions
Lubrication
Microbial activity
Microorganisms
Oxidation
Polymerization
Reactors
Salts
Sequencing batch reactor
Solvents
Trimethylamine
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Summary:BACKGROUND Ionic liquids (ILs) are salts consisting of an organic cation and an organic or inorganic anion that are potential use for organic synthesis, biomass conversion, gas absorption, polymerization, metal extraction and lubrication. We examined the biodegradability of choline chloride (CholineCl), choline acetate (CholineAc) and choline bis(trifluoromethylsulfonyl)imide (CholineNTf2) in a sequencing batch reactor (SBR) to assess the influence of the IL anion. RESULTS Following acclimation, activated sludge exhibited good activity, and high COD (80–90%) and TOC removal (75–85%) with initial concentrations of CholineCl and CholineAc over the range 0.25–15 mmol L–1. However, increased concentrations of CholineNTf2 in the reactor feed had an inhibitory effect on the sludge. An analysis of the reaction effluent revealed the presence of the main intermediates of choline degradation: ethanol, and methyl‐, dimethyl‐ and trimethylamine. The initial and final microbial communities of the sludge were characterized by pyrosequencing analysis, and the latter was found to consist mainly of Alfa‐, Beta‐ and Gamma‐proteobacteria. CONCLUSION Choline‐based ionic liquids can be efficiently removed in SBRs. Complete choline degradation (0.25–15 mmol L–1) was accomplished at a variable depletion rate depending on the particular IL anion (chloride, acetate or NTf2). © 2019 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.5954