Production of hydrogen energy from dilute acid-hydrolyzed palm oil mill effluent in dark fermentation using an empirical model

Nadia Farhana Azman, Peyman Abdeshahian, Najeeb Kaid Nasser Al-Shorgani, Aidil Abdul Hamid, Mohd. Sahaid Kalil

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Hydrogen generation was studied using palm oil mill effluent (POME) as an agro-industrial waste obtained from the palm oil industry. POME was subjected to a dilute acid hydrolysis step by HCl (37% v/v) to release fermentable sugars from cellulosic content. POME hydrolysate obtained was used as a substrate for hydrogen generation. The composition of POME hydrolysate showed glucose and xylose were the main monomeric sugars liberated. Hydrogen production was performed in dark fermentation process, in which the new bacterial strain Clostridium acetobutylicum YM1 was cultivated on POME hydrolysate based on a central composite design (CCD). CCD was constructed by considering three pivotal process variables including incubation temperature, initial pH of culture medium and microbial inoculum size. An empirical model, namely second-order polynomial regression model was generated and adjusted to CCD data. The analysis of empirical model generated showed that the linear and quadratic terms of temperature had a highly significant effect on hydrogen generation (P <0.01). Furthermore, the quadratic effects of initial pH value of culture medium and inoculum size had a significant effect on hydrogen production at 95% probability level (P <0.05). The regression model also showed that the interaction effect between temperature and initial pH value of the culture medium on the hydrogen generation was highly significant (P <0.01). The empirical model suggested that the optimum conditions for hydrogen production were an incubation temperature of 38 °C, initial pH value of 5.85 and inoculum size of 17.61% with predicting the production of a cumulative hydrogen volume of 334.2 ml under optimum conditions. In order to validate the optimum conditions determined, C. acetobutylicum YM1 was cultivated on POME hydrolysate in optimum conditions. Verification test results showed that a cumulative hydrogen volume of 333.5 ml and a hydrogen yield of 108.35 ml H2/g total reducing sugars consumed were produced.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusAccepted/In press - 13 Oct 2015

Fingerprint

fermentation
Palm oil
effluents
Fermentation
Effluents
oils
inoculum
Hydrogen
acids
Acids
culture media
hydrogen
hydrogen production
Hydrogen production
sugars
Sugars
energy
composite materials
regression analysis
Composite materials

Keywords

  • Clostridium acetobutylicum YM1
  • Acid hydrolysis
  • Dark fermentation
  • Empirical model
  • Hydrogen production
  • Palm oil mill effluent

ASJC Scopus subject areas

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

Cite this

Production of hydrogen energy from dilute acid-hydrolyzed palm oil mill effluent in dark fermentation using an empirical model. / Azman, Nadia Farhana; Abdeshahian, Peyman; Al-Shorgani, Najeeb Kaid Nasser; Abdul Hamid, Aidil; Kalil, Mohd. Sahaid.

In: International Journal of Hydrogen Energy, 13.10.2015.

Research output: Contribution to journalArticle

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