Enhancement of hydrogen production by optimization of pH adjustment and separation conditions following dilute acid pretreatment of lignocellulosic biomass

Ralph Rolly Gonzales, Gopalakrishnan Kumar, Periyasamy Sivagurunathan, Sang Hyoun Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Biorefinery is the integration of various conversion and separation unit processes of biomass to energy, among other products. Downstream processes link these unit processes; however, these are often overlooked to affect energy yield. In this study, use of different alkaline agents and separation techniques, and order of operations, was assessed after conversion of processed sugar into hydrogen through dark fermentation. pH was adjusted to pH 6 using various basic agents; and vacuum filtration and centrifugation were performed to facilitate separation. Sugar loss of 7–40% due to the downstream processes was recorded; however, optimization of the processes ensured high volume and sugar recovery and low degradation byproduct production. Satisfactory volume recovery with high sugar and low byproduct concentrations were achieved after vacuum filtration and pH adjustment with aqueous base. H2 yield and production rate significantly increased after performing the downstream processes. Peak H2 production rate and yield were 1824 mL H2 L−1 d−1 and 1.27 mol H2 mol−1 sugar, respectively, for the optimum condition of vacuum filtration, followed by pH adjustment using 8 N Ca(OH)2.

Original languageEnglish
Pages (from-to)27502-27511
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number45
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

hydrogen production
biomass
Hydrogen production
sugars
Sugars
pretreatment
Biomass
adjusting
acids
optimization
Acids
augmentation
Vacuum
vacuum
Byproducts
Chemical reactions
recovery
Recovery
Bioconversion
fermentation

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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abstract = "Biorefinery is the integration of various conversion and separation unit processes of biomass to energy, among other products. Downstream processes link these unit processes; however, these are often overlooked to affect energy yield. In this study, use of different alkaline agents and separation techniques, and order of operations, was assessed after conversion of processed sugar into hydrogen through dark fermentation. pH was adjusted to pH 6 using various basic agents; and vacuum filtration and centrifugation were performed to facilitate separation. Sugar loss of 7–40{\%} due to the downstream processes was recorded; however, optimization of the processes ensured high volume and sugar recovery and low degradation byproduct production. Satisfactory volume recovery with high sugar and low byproduct concentrations were achieved after vacuum filtration and pH adjustment with aqueous base. H2 yield and production rate significantly increased after performing the downstream processes. Peak H2 production rate and yield were 1824 mL H2 L−1 d−1 and 1.27 mol H2 mol−1 sugar, respectively, for the optimum condition of vacuum filtration, followed by pH adjustment using 8 N Ca(OH)2.",
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AU - Kumar, Gopalakrishnan

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AU - Kim, Sang Hyoun

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AB - Biorefinery is the integration of various conversion and separation unit processes of biomass to energy, among other products. Downstream processes link these unit processes; however, these are often overlooked to affect energy yield. In this study, use of different alkaline agents and separation techniques, and order of operations, was assessed after conversion of processed sugar into hydrogen through dark fermentation. pH was adjusted to pH 6 using various basic agents; and vacuum filtration and centrifugation were performed to facilitate separation. Sugar loss of 7–40% due to the downstream processes was recorded; however, optimization of the processes ensured high volume and sugar recovery and low degradation byproduct production. Satisfactory volume recovery with high sugar and low byproduct concentrations were achieved after vacuum filtration and pH adjustment with aqueous base. H2 yield and production rate significantly increased after performing the downstream processes. Peak H2 production rate and yield were 1824 mL H2 L−1 d−1 and 1.27 mol H2 mol−1 sugar, respectively, for the optimum condition of vacuum filtration, followed by pH adjustment using 8 N Ca(OH)2.

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