Bioconversion of de-oiled Jatropha Waste (DJW) to hydrogen and methane gas by anaerobic fermentation: Influence of substrate concentration, temperature and pH

Gopalakrishnan Kumar, Chiu Yue Lin

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41 Citations (Scopus)

Abstract

Cellulosic materials-based de-oiled Jatropha Waste (DJW) was fermented to H2 and CH4 using sewage sludge inoculum. Batch assays were performed at various substrate concentrations (40-240 g/L), temperatures (25-65°C) and pHs (5.5-7.5). The peak hydrogen production rate (HPR) and hydrogen yield (HY) of 744.0 ± 11.3 mL H2/L-d and 10.6 ± 0.2 mL H2/g VS obtained when the optimal substrate concentration, pH, temperature were 200 g/L, 6.5, 55°C, respectively. The peak methane production rate (MPR) of 178.4 ± 5.6 mL CH4/L-d obtained while DJW concentration, pH, temperature were 200 g/L, 7.0, 45°C, however, peak methane yield (MY) of 23.3 ± 0.1 mL CH4/g VS obtained at 40 g/L, 7.0 and 55°C, respectively. Effect of substrate concentration on HPR and MPR was elucidated using Monod model. Butyrate and acetate were the main soluble metabolic products. Maximal carbohydrate removal and COD reduction were achieved as 51.7 ± 0.7% and 68.3 ± 1.6%, respectively.

Original languageEnglish
Pages (from-to)63-72
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number1
DOIs
Publication statusPublished - 2013 Jan 11

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bioconversion
Bioconversion
fermentation
Fermentation
Methane
methane
Hydrogen production
Hydrogen
hydrogen production
Substrates
hydrogen
Gases
gases
inoculum
Sewage sludge
Carbohydrates
sewage
Temperature
sludge
temperature

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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title = "Bioconversion of de-oiled Jatropha Waste (DJW) to hydrogen and methane gas by anaerobic fermentation: Influence of substrate concentration, temperature and pH",
abstract = "Cellulosic materials-based de-oiled Jatropha Waste (DJW) was fermented to H2 and CH4 using sewage sludge inoculum. Batch assays were performed at various substrate concentrations (40-240 g/L), temperatures (25-65°C) and pHs (5.5-7.5). The peak hydrogen production rate (HPR) and hydrogen yield (HY) of 744.0 ± 11.3 mL H2/L-d and 10.6 ± 0.2 mL H2/g VS obtained when the optimal substrate concentration, pH, temperature were 200 g/L, 6.5, 55°C, respectively. The peak methane production rate (MPR) of 178.4 ± 5.6 mL CH4/L-d obtained while DJW concentration, pH, temperature were 200 g/L, 7.0, 45°C, however, peak methane yield (MY) of 23.3 ± 0.1 mL CH4/g VS obtained at 40 g/L, 7.0 and 55°C, respectively. Effect of substrate concentration on HPR and MPR was elucidated using Monod model. Butyrate and acetate were the main soluble metabolic products. Maximal carbohydrate removal and COD reduction were achieved as 51.7 ± 0.7{\%} and 68.3 ± 1.6{\%}, respectively.",
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