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TitleSodium lauryl ether sulfate (SLES) degradation by nitrate-reducing bacteria
Author(s)Paulo, Ana M. S.
Aydin, Rozelin
Dimitrov, Mauricio R.
Vreeling, Harm
Cavaleiro, Ana Júlia
García-Encina, Pedro A.
Stams, Alfons Johannes Maria
Plugge, Caroline M.
KeywordsAnionic surfactants
Sodium lauryl ether sulfate
Issue dateJun-2017
PublisherSpringer Nature
JournalApplied Microbiology and Biotechnology
CitationPaulo, Ana M. S.; Aydin, Rozelin; Dimitrov, Mauricio R.; Vreeling, Harm; Cavaleiro, Ana Júlia; García-Encina, Pedro A.; Stams, A. J. M.; Plugge, Caroline M., Sodium lauryl ether sulfate (SLES) degradation by nitrate-reducing bacteria. Applied Microbiology and Biotechnology, 101(12), 5163-5173, 2017
Abstract(s)The surfactant sodium lauryl ether sulfate (SLES) is widely used in the composition of detergents and frequently ends up in wastewater treatment plants (WWTPs). While aerobic SLES degradation is well studied, little is known about the fate of this compound in anoxic environments, such as denitrification tanks of WWTPs, nor about the bacteria involved in the anoxic biodegradation. Here, we used SLES as sole carbon and energy source, at concentrations ranging from 50 to 1000 mg L1, to enrich and isolate nitrate-reducing bacteria from activated sludge of a WWTP with the anaerobic-anoxic-oxic (A2/O) concept. In the 50 mg L1 enrichment, Comamonas (50%), Pseudomonas (24%), and Alicycliphilus (12%) were present at higher relative abundance, while Pseudomonas (53%) became dominant in the 1000 mg L1 enrichment. Aeromonas hydrophila strain S7, Pseudomonas stutzeri strain S8, and Pseudomonas nitroreducens strain S11 were isolated from the enriched cultures. Under denitrifying conditions, strains S8 and S11 degraded 500 mg L1 SLES in less than 1 day, while strain S7 required more than 6 days. Strains S8 and S11 also showed a remarkable resistance to SLES, being able to grow and reduce nitrate with SLES concentrations up to 40 g L1. Strain S11 turned out to be the best anoxic SLES degrader, degrading up to 41% of 500 mg L1. The comparison between SLES anoxic and oxic degradation by strain S11 revealed differences in SLES cleavage, degradation, and sulfate accumulation; both ester and ether cleavage were probably employed in SLES anoxic degradation by strain S11.
DescriptionThe online version of this article (doi:10.1007/s00253-017-8212-x) contains supplementary material, which is available to authorized users.
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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