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RISS 인기검색어
- 검색키워드
- 저자 : Ralph Rolly Gonzales (검색결과 4 건)
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Gonzales, Ralph Rolly,Kim, Jun Seok,Kim, Sang-Hyoun Elsevier 2019 International journal of hydrogen energy Vol.44 No.4
<P><B>Abstract</B></P> <P>Pretreatment of the empty fruit brunch (EFB) from oil palm was investigated for H<SUB>2</SUB> fermentation. The EFB was hydrolyzed at various temperatures, H<SUB>2</SUB>SO<SUB>4</SUB> concentrations, and reaction times. Subsequently, the acid-hydrolysate underwent enzymatic saccharification under various temperature, pH, and enzymatic loading conditions. Response surface methodology derived the optimum sugar concentration (SC), hydrogen production rate (HPR), and hydrogen yield (HY) as 28.30 g L<SUP>−1</SUP>, 2601.24 mL H<SUB>2</SUB> L<SUP>−1</SUP>d<SUP>−1</SUP>, and 275.75 mL H<SUB>2</SUB> g<SUP>−1</SUP> total sugar (TS), respectively, at 120 °C, 60 min of reaction, and 6 vol% H<SUB>2</SUB>SO<SUB>4</SUB>, with the combined severity factor of 1.75. Enzymatic hydrolysis enhanced the SC, HY, and HPR to 34.52 g L<SUP>−1</SUP>, 283.91 mL H<SUB>2</SUB> g<SUP>−1</SUP> TS, and 3266.86 mL H<SUB>2</SUB> L<SUP>−1</SUP>d<SUP>−1</SUP>, respectively, at 45 °C, pH 5.0, and 1.17 mg enzyme mL<SUP>−1</SUP>. Dilute acid hydrolysis would be a viable pretreatment for biohydrogen production from EFB. Subsequent enzymatic hydrolysis can be performed if enhanced HPR is required.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dilute acid and enzymatic hydrolysis were optimized for oil palm empty fruit bunch. </LI> <LI> Response surface methodology was used for optimization of pretreatment. </LI> <LI> Dilute acid hydrolysis effectively pretreated the biomass for H<SUB>2</SUB> fermentation. </LI> <LI> Subsequent enzymatic saccharification enhanced H<SUB>2</SUB> production rate. </LI> </UL> </P>
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Rolly Gonzales, Ralph,Hong, Yongseok,Park, Jong‐,Hun,Kumar, Gopalakrishnan,Kim, Sang‐,Hyoun WILEY & SONS 2016 Journal of Chemical Technology & Biotechnology Vol.91 No.4
<P>BACKGROUND5-hydroxymethylfurfural (5-HMF), the major by-product in hydrolyzates from lignocelluloses and algal biomass, is known as an inhibitor of several microorganisms as well as a promising precursor for biorefinery. In this study, the feasibility of 5-HMF sequestration was investigated using granular activated carbon (GAC) as the adsorbent. RESULTSEquilibria for the 5-HMF adsorption onto GAC were derived. Positive isosteric heat values showed the reaction was exothermic and favored at low temperature. The pseudo-second order dynamics and the estimated activation energy, 227.4 kJ mol(-1), implied that the removal mechanism would be chemical adsorption. The adsorption was not interfered with by the presence of sugar and sugar compounds were not adsorbed onto GAC. CONCLUSIONBatch and column tests on dilute acid hydrolyzate of red algal biomass showed that GAC adsorption would be a feasible option for sequestration of 5-HMF in hydrolyzate for the biofuel and biorefinery industries. (c) 2015 Society of Chemical Industry</P>
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Gonzales, Ralph Rolly,Kumar, Gopalakrishnan,Sivagurunathan, Periyasamy,Kim, Sang-Hyoun Elsevier 2017 International journal of hydrogen energy Vol.42 No.45
<P><B>Abstract</B></P> <P>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. H<SUB>2</SUB> yield and production rate significantly increased after performing the downstream processes. Peak H<SUB>2</SUB> production rate and yield were 1824 mL H<SUB>2</SUB> L<SUP>−1</SUP> d<SUP>−1</SUP> and 1.27 mol H<SUB>2</SUB> mol<SUP>−1</SUP> sugar, respectively, for the optimum condition of vacuum filtration, followed by pH adjustment using 8 N Ca(OH)<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dilute acid pretreated pine tree wood was tested for neutralization and fractionation. </LI> <LI> Treated hydrolyzates were used as substrates for biohydrogen production. </LI> <LI> Filtration then neutralization with aqueous base is the best treatment method. </LI> </UL> </P>
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