On the independence of hydrogen production from methanogenic suppressor in olive mill wastewater

Anaerobic degradation of olive mill wastewater (OMW) at concentrations ranging from 2 to 100 g/L of chemical oxygen demand (COD) was assessed in batch assays. Methane was the main final product obtained for the lower concentrations tested. For 25 g COD/L, H sub(2) was temporarily produced, albeit H...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-04, Vol.39 (12), p.6402-6406
Main Authors: GONCALVES, M. R, COSTA, J. C, PEREIRA, M. A, ABREU, A. A, ALVES, M. M
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Assaying
Chemical oxygen demand
Energy
Exact sciences and technology
Fuels
Hydrogen
Methane
Mills
Olives
Oxygen demand
Suppressors
Waste water
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Summary:Anaerobic degradation of olive mill wastewater (OMW) at concentrations ranging from 2 to 100 g/L of chemical oxygen demand (COD) was assessed in batch assays. Methane was the main final product obtained for the lower concentrations tested. For 25 g COD/L, H sub(2) was temporarily produced, albeit H sub(2) depletion occurred, likely due to homoacetogenesis, since acetate was formed concomitantly. Hydrogen was produced and accumulated permanently in the assays containing 50 g COD/L of OMW. Methanogenesis and homoacetogenesis were naturally inhibited, suggesting that hydrogen recovery from OMW can be performed without the addition of methanogenic suppressors such as 2-bromoethanosulfonate. This fact opens new perspectives for the utilization of high OMW concentrations in a two-stage valorisation process combining biohydrogen and biomethane production.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.02.056