Implications of volatile fatty acid profile on the metabolic pathway during continuous sulfate reduction

Journal of Environmental Management
Sueli M BertolinoV A Leão

Abstract

Volatile fatty acid (VFA) profile is an important parameter in anaerobic reactors because it enables the assessment of metabolic pathways. Volatile fatty acids were monitored during sulfate reduction in a UASB (upflow anaerobic sludge blanket) reactor treating 2g/L sulfate concentration and with the organic loading increasing from 3.5 kg COD/m(3)d to 5.9 kg COD/m(3)d, for a 1-day residence time. In the absence of recirculation, the best outcome (65% reduction) was noticed with the lowest organic loading (3.55 kg/m(3)d). When recirculation was applied, sulfate reduction yields increased to 89%, corresponding to a sulfate removal rate of 1.94 kg SO(4)(2-)/m(3)d. The reactor performance was discussed in relation to microbial diversity and metabolic pathways. At high organic loading, two metabolic pathways account for lactate degradation: (i) lactate is oxidized to acetate and carbon dioxide by the incomplete-oxidizer SRB (sulfate-reducing bacteria) Desulfomonas, Desulfovibrio, Desulfolobus, Desulfobulbus and Desulfotomaculum spp.; (ii) lactate is converted to acetate by fermenting bacteria such as Clostridium sp. High propionate concentrations imply that there are low sulfate reduction efficiencies.

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Citations

May 3, 2013·Applied Microbiology and Biotechnology·Kathleen E DuncanKerry Sublette
Apr 9, 2014·World Journal of Microbiology & Biotechnology·L P BarbosaM C Teixeira
Sep 1, 2015·Journal of Hazardous Materials·Bidus Kanti DasJayanta Bhattacharya
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Jan 25, 2019·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Mario Alberto Santana-SantosClaudia Guerrero-Barajas
Sep 1, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Gabriela F SampaioGiselle P Sancinetti
Jul 3, 2020·Environmental Science and Pollution Research International·Isabel Cristina Braga Rodrigues, Versiane A Leão
Jul 14, 2017·Environmental Science and Pollution Research International·Luis C Reyes-AlvaradoEric Houbron
Nov 16, 2019·The Science of the Total Environment·E Fernández-PalaciosD Gabriel

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