Influence of co-substrates in the anaerobic degradation of an anionic surfactant

AUTOR(ES)

Okada, D. Y., Esteves, A. S., Delforno, T. P., Hirasawa, J. S., Duarte, I. C. S., Varesche, M. B. A.

FONTE

Braz. J. Chem. Eng.

DATA DE PUBLICAÇÃO

2013-09

RESUMO

The removal of linear alkylbenzene sulfonate (LAS) was evaluated in a UASB reactor using short-chain alcohols (ethanol and methanol) and complex co-substrate (yeast extract). Using only methanol and ethanol as co-substrates resulted in removal of LAS between 30 and 41%. At the end, addition of a complex substrate (yeast extract) increased the removal of LAS to 50%. During the assay, water supply aeration increased the volatile fatty acid of the effluent (70 mg HAc.L-1) and decreased the removal of LAS (from 40 to 30%). According to the fluorescence in situ hybridization (FISH) results, the amount of Archaea decreased due to water supply aeration (from 64 to 48%). Furthermore, addition of complex co-substrate increased the total anaerobic bacteria and methanogenic archaea content (three and four log units, respectively), which were estimated using the most probable number technique.

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