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TitleA compact high-rate anaerobic reactor configuration for the treatment of effluents with high lipid content
Author(s)Picavet, M. A.
Alves, M. M.
KeywordsAnaerobic biodegradation of effluents with high lipid content
Methane production
Long Chain Fatty Acids
Slaughterhouse wastewater
Anaerobic reactor technology
Issue date2010
PublisherIWA Publishing
Abstract(s)Existing high rate anaerobic technology such as UASB, EGSB and IC reactors based on granular sludge is not robust when applied to industrial effluents with high lipids content. After discovering the potential of converting fat and long chain fatty acids to methane, the development of a compact high rate anaerobic reactor technology for the treatment of effluents of high lipid content was pursued. In this paper the basic principles of the IASB technology (patented) are described and results of a pilot plant treating a slaughterhouse effluent are presented. An organic loading rate of 16 kg COD/ was applied being 63% of fat. Effluent VSS were around 500 mg/L. COD removal efficiency was consistently above 80% and excessive LCFA accumulation was prevented (<1 g COD-LCFA/gTS) in the reaction section of the IASB reactor.Nevertheless, LCFA accumulated again when the organic loading rate was increased from 2 to 3 and 5 kg COD m-3 d-1. The profiles of LCFA, obtained with OMW digestion, were different from previous studies with synthetic effluents. At the beginning of reactors operation, oleate was the main LCFA compound (~50%) followed by palmitate. Afterwards, a shift in the LCFA pattern accumulation was noticed for both reactors. At periods with higher OMW concentrations (30-50 g COD L-1, 3-5 kg COD m-3 d-1) palmitate was the main LCFA accumulated with 69% at R1 and 54% at R2. For real oily wastewaters, a periodically batch period could be a practical solution to maintain low values of LCFA inside the reactor. The addition of a nitrogen source was essential to enhance the methane yield.
TypeConference paper
AccessOpen access
Appears in Collections:CEB - Artigos em Livros de Atas / Papers in Proceedings

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