Anaerobic bio-hydrogen production from ethanol fermentation: the role of pH

Hwang, Moon Hyun; Jang, Nam J.; Hyun, Seok−Hee; Kim, In Soo

doi:10.1016/j.jbiotec.2004.04.024

Cited by 269 publications

(108 citation statements)

References 16 publications

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“…[2023] Conversely, the theoretical yield of hydrogen according to acetate-ethanol pathway is 2 mol hydrogen/mol glucose. [1222] The synthesis of ethanol from acetyl-CoA can produce reduced ferredoxin and also H 2 generation. The lower biohydrogen production during KOH pretreatment presumably related to electron flows from reduced ferredoxin to NAD + and produced NADH 2 instead of biohydrogen.…”

Section: Discussionmentioning

confidence: 99%

“…[212] Acetate-propionate pathway is another fermentation pathway that does not produce any hydrogen. [8]…”

Section: Introductionmentioning

confidence: 99%

“…In comparison to acetate-butyrate metabolic pathway, acetate-ethanol pathway is more stable way for hydrogen production and it seems that this pathway has been down by Ethanoligenens, Acetanaerobacterium, Clostridum, Rhodopseudomona , and Citrobacter (the dominant genera are unknown). [812]…”

Section: Introductionmentioning

confidence: 99%

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Comparison of acetate-butyrate and acetate-ethanol metabolic pathway in biohydrogen production

et al. 2018

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Background:Hydrogen gas is the cleanest energy carrier and could be produced by biological process. Dark fermentation is one of the biohydrogen production methods that carried out just on organic wastes conversion.Methods:In this study, the batch tests were conducted to compare the biohydrogen production and glucose fermentation via acetate-butyrate and acetate-ethanol metabolic pathway induced by NaOH and KOH (10 M) pretreatment. In batch test, the glucose concentration in the feed was varied from 3.75 to 15 g/L under mesophilic conditions (37°C ± 1°C). In order to sludge pretreatment, NaOH and KOH (as an alkaline agent) was used.Results:Batch tests showed that maximum biohydrogen production under NaOH (2.7 ± 0.5 L) and KOH (2.2 ± 0.7 L) pretreatment was achieved at 15 g/L of influent glucose. In the batch test, with increasing influent glucose concentration, the lower yields of hydrogen were observed. The biohydrogen reactions had good electron closure (5.2%–13.5%) for various glucose concentrations and pretreatments. For NaOH and KOH pretreatment, the biohydrogen yield decreased from 2.49 to 1.63 and from 2.22 to 1.2 mol H2/mol glucose, respectively, when glucose concentration increased from 3.75 to 15 g/L.Conclusions:By applying alkaline sludge pretreatment by NaOH and KOH, the glucose fermentation was followed with acetate-butyrate and acetate-ethanol metabolic pathway, respectively. The lower biohydrogen yields were observed under acetate-ethanol metabolic pathway and related to metabolically unfavorable for biohydrogen production.

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Section: Discussionmentioning

confidence: 99%

“…[212] Acetate-propionate pathway is another fermentation pathway that does not produce any hydrogen. [8]…”

Section: Introductionmentioning

confidence: 99%

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Comparison of acetate-butyrate and acetate-ethanol metabolic pathway in biohydrogen production

et al. 2018

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“…According to literature reporting [3][4][5], two major classes of hydrogenases are recognized based on their metal active sites: [FeFe] and [NiFe]. Depending on whether light will be involved, this biological hydrogen production process can be simply classified as photo-and dark-fermentation processes [6]. During the photo-fermentation process, the hydrogenase enzyme synthesized and activated under dark anaerobic condition is used to convert ethanol to biohydrogen under light anaerobic condition.…”

Section: Fermentative Hydrogen Productionmentioning

confidence: 99%

“…Various synthesis methods have been successfully demonstrated to get TiO 2 supported catalyst with desirable particle size and morphology for hydrogen generation maximization. Besides TiO 2 supported catalyst, there are multiple other novel semiconductors being developed recently for effective hydrogen production including CdS [15], VO 2 [16], WO 3 [17], and ZnSn(OH) 6 [18]. Nevertheless, the hydrogen production efficiency from catalytic ethanol oxidation still remains at very low level probably due to two facts: the fast recombination rate of the created electron-hole pairs and the low photon absorption efficiency at visible light range.…”

Section: Photocatalytic Hydrogen Productionmentioning

confidence: 99%