Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 30, Issue 3, Pages 499-506Publisher
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/S0104-66322013000300008
Keywords
Linear alkylbenzene sulfonate; Acetic acid; Methanogenic archaea; UASB; FISH
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2009/50427-5]
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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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