Anaerobic digestion from residue of industrial cassava industrialization with acidogenic and methanogenic physical separation phases

A trial was carried out in a continuous regimen, using a completely stirred tank reactor, at acidogenic phase, and a hybrid reactor (upflow anaerobic sludge blanket + fixed bed) at methanogenic phase at room temperature. The residue to be treated came from a flour and cassava meal industry, and the...

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Bibliographic Details
Published in:Applied biochemistry and biotechnology 2000, Vol.84 (1-9), p.809-819
Main Authors: Paixao, M.A, Tavares, C.R.G, Bergamasco, R, Bonifacio, A.L.E, Costa, R.T
Format: Article
Language:English
Subjects:
acids
ambient temperature
Anaerobic digestion
Anaerobiosis
Bacteria
Biofuel production
Biogas
Biological and medical sciences
Biomass
Biotechnology
Carboxylic Acids - analysis
cassava
cassava flour
Chemical oxygen demand
cyanides
Cyanides - analysis
Energy
Euryarchaeota - physiology
Fermentation
Flour
Food Handling
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
industrialization
industry
Manihot
Manihot esculenta
Methane
Methane - analysis
methane production
methanogens
Organic matter
Reactors
Space life sciences
upflow anaerobic sludge blanket reactor
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Summary:A trial was carried out in a continuous regimen, using a completely stirred tank reactor, at acidogenic phase, and a hybrid reactor (upflow anaerobic sludge blanket + fixed bed) at methanogenic phase at room temperature. The residue to be treated came from a flour and cassava meal industry, and the reactors operated for 300 d with affluent chemical oxygen demand (COD) concentrations of 7500, 9000, 11,000, and 14,000 mg/L. The final results showed a biogas production with a content of 80% methane and an average reduction of COD and free cyanide of nearly 96 and 98%, respectively. The separation of phases selected bacterial groups. At acidogenic phase, a predominance of propionic, n-butyric, and n-valeric acids, as well as a biomass composed of 95% fermentative bacilli, which were responsible for a 90% reduction in free cyanide concentration, was observed. At methanogenic phase, a predominance of methanogenic bacteria that came only from the Methanothrix genus was observed. The bacteria were responsible for high levels of organic matter removal and methane production.
ISSN:0273-2289
1559-0291
0273-2289
DOI:10.1385/abab:84-86:1-9:809