Evaluation of bioenergy recovery processes treating organic residues from ethanol fermentation process.
Bioresour Technol
; 102(9): 5394-9, 2011 May.
Article
em En
| MEDLINE
| ID: mdl-21055919
ABSTRACT
This study evaluates a two-stage bioprocess for recovering bioenergy in the forms of hydrogen and methane while treating organic residues of ethanol fermentation from tapioca starch. A maximum hydrogen production rate of 0.77 mmol H(2)/g VSS/h can be achieved at volumetric loading rate (VLR) of 56 kg COD/m(3)/day. Batch results indicate that controlling conditions at S(0)/X(0)=12 with X(0)=4000 mg VSS/L and pH 5.5-6 are important for efficient hydrogen production from fermentation residues. Hydrogen-producing bacteria enriched in the hydrogen bioreactor are likely utilizing lactate and acetate for biohydrogen production from ethanol-fermentation residues. Organic residues remained in the effluent of hydrogen bioreactor can be effectively converted to methane with a rate of 0.37 mmol CH(4)/g VSS/h at VLR of 8 kg COD/m(3)/day. Approximately 90% of COD in ethanol-fermentation residues can be removed and among that 2% and 85.1% of COD can be recovered in the forms of hydrogen and methane, respectively.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos Orgânicos
/
Conservação de Recursos Energéticos
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Etanol
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Biocombustíveis
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Fermentação
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article