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Doctoral Thesis
Document
Author
Full name
Eduardo Lucena Cavalcante de Amorim
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2009
Supervisor
Committee
Silva, Edson Luiz (President)
Aguiar, Monica Lopes
Badino Junior, Alberto Colli
Barboza, Marcio Gomes
Zaiat, Marcelo
Title in Portuguese
Efeito da concentração de glicose e da alcalinidade na produção de hidrogênio em reator anaeróbio de leito fluidificado
Keywords in Portuguese
Conversão fermentativa
Produção de hidrogênio
Reator anaeróbio de leito fluidificado
Abstract in Portuguese
O objetivo deste estudo foi avaliar o efeito da adição de alcalinidade, da concentração da glicose e da taxa de carregamento orgânico na produção de hidrogênio e ácidos orgânicos em reator anaeróbio de leito fluidificado (RALF), contendo argila expandida (2,8 - 3,35 mm) como material suporte para adesão microbiana. Foram utilizados oito reatores idênticos, sendo quatro deles operados sem adição de alcalinidade, e com concentração de glicose de 2000, 4000, 10000 e 25000 mg/L, respectivamente. Outros quatro reatores operados com adição de alcalinidade, e com as mesmas concentrações de glicose cada um. Os reatores foram inoculados com lodo anaeróbio pré-tratado termicamente, operado com tempo de detenção hidráulica (TDH) decrescente de 8 h a 1 h à temperatura controlada de 30°C. Foi constatada produção volumétrica de hidrogênio máxima de 1,58 L/h.L, para o reator operado com 10000 mg/L de glicose com adição de alcalinidade (R10CA) e um rendimento máximo de 2,52 mol 'H IND.2'/mol glicose, para o reator operado com 4000 mg/L de glicose com adição de alcalinidade (R4CA). O biogás produzido foi composto de 'H IND.2' e 'CO IND.2'. Em ambos os reatores, o conteúdo de hidrogênio aumentou com a redução do TDH de 8 h para 1 h, alcançando valor máximo de 77%, para o reator operado com 4000 mg/L sem adição de alcalinidade (R4SA). Os reatores operados com altas concentrações de glicose produção de hidrogênio, o qual predominou o ácido acético e butírico. Neste mesmo reator, o rendimento da produção de hidrogênio foi superior aos outros reatores. As análises de clonagem e sequenciamento do consórcio bacteriano revelaram semelhanças com Clostridium, Klebsiella, Enterobacter e bactérias não cultivadas.
Title in English
Effect of glucose concentration and alkalinity in the hydrogen production in anaerobic fluidized bed
Keywords in English
Anaerobic fluidized bed reactor
Fermentative convertion
Hydrogen production
Abstract in English
This study evaluated the effect alkalinity addition, glucose concentration and organic loading rate in the hydrogen production and organic acids in an anaerobic fluidized bed reactor (AFBR), containing expanded clay (2.8 - 3,35 mm) as support material for microbial adhesion. We used eight identical reactors, four of them operated without the addition of alkalinity, and concentration of glucose in 2000, 4000, 10000 and 25000 mg/L, respectively. Another four reactors operated with the addition of alkalinity, and with the same concentrations of glucose each. The reactors were operated with hydraulic retention times (HRT) ranging from 8 h at 1 h, and temperature of 30°C. It has been found for hydrogen production rate maximum 1.58 L/h.L for the reactor operated with 10000 mg/L glucose with the addition of alkalinity (R10CA) and a maximum yield of 2.52 mol 'H IND.2'/mol glucose to the reactor operated with 4000 mg/L glucose with the addition of alkalinity (R4CA). The biogas produced was composed of 'H IND.2' and 'CO IND.2'. In both reactors, the hydrogen content increased with the reduction of HRT of 8 h at 1 h, reaching a maximum of 77% for the reactor operated from 4000 mg/L without added alkalinity (R4SA). The reactors operated with high glucose concentrations (10000 mg/L and 25000 mg/L) had higher proportions of solvents such as soluble metabolites. There was a linear correlation between the hydrogen production rate and organic loading rate in all reactors. The yield, the hydrogen production rate and distribution of soluble metabolites in both reactors, were influenced by the glucose concentration. The reactor operated with 4000 mg/L and addition of alkalinity, presented the most favorable distribution of soluble metabolites to hydrogen production, which was predominant acetic and butyric acid. In the same reactor, the hydrogen yield was higher than other reactors. The cloning and sequencing analysis bacterial consortium revealed the presence of Clostridium, Klebsiella, Enterobacter and uncultivated bacteria.
 
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AmorimELC2009.pdf (7.10 Mbytes)
Publishing Date
2010-03-30
 
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