Advanced strategies for enhancing dark fermentative biohydrogen production from biowaste towards sustainable environment
Dongle ChengHuu Hao NgoWenshan GuoSoon Woong ChangDinh Duc NguyenLijuan DengZhuo ChenYuanyao YeXuan‐Thanh BuiNgoc Bich Hoang
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Dark fermentation
Fermentative hydrogen production
Hydrogen energy, as a kind of clean energy with great potential, has been a hotspot for study worldwide. Based on the recent research on biohydrogen production, this paper gives a brief review on the following aspects: fermentative hydrogen production process and the engineering control statagy, key factors affecting the efficiency of hydrogen production, such as substrates, cysteine, metal ions, anaerobic fermentation terminal products, and formic acid and ammonia. Moreover, anaerobic fermentative hydrogen-producing strain and regulation and control of enzyme gene in fermentative hydrogen production are also discussed. Finally, the prospect of anaerobic fermentative biohydrogen production is proposed in three study areas, namely developing new techniques for breeding hydrogen-producing bacteria, exploitations of more strains and gene resources, and intensifying the application of microbial molecular breeding in hydrogen production.
Fermentative hydrogen production
Dark fermentation
Anaerobic respiration
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Biological production of hydrogen is the most environmental friendly method in producing hydrogen, a clean fuel which produces only water upon combustion. There are many references available on biohydrogen production. This paper presents a review on current biological hydrogen production focusing on dark and photo fermentation processes. Limitation for hydrogen production such as source of substrate, type of microorganism employed and operational parameter are discussed in this paper.
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Dark fermentation
Fermentative hydrogen production
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Dark fermentation
Fermentative hydrogen production
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Abstract Dark fermentative biohydrogen production with other waste biomass needs to be explored as an alternative for sustainable biohydrogen production in future. the biohydrogen production from co-substrates (DW + SCB) using bacterial monocultures and its consortium was performed through dark fermentation in a laboratory scale reactor. Co-substrates are a promising substrate for enhanced biohydrogen production. For the experimental set-up, a 1-L-working-volume reactor was used for biohydrogen production by bacterial monocultures and consortium on co-substrates. A batch experiment was performed at 37°C with an initial pH of 7.0 and a mixing ratio of 600:300 between DW and solid SCB. Total solids, volatile solids, total chemical oxygen demand, soluble chemical oxygen demand, and hydrogen production rate were determined from co-substrates during the dark fermentation process. Morphological changes of biohydrogen producing bacteria binds on co-substrates after the fermentation process were determined using SEM imaging. The bacteria can degrade the substrate when they attach to it causing hole formation and cracked the surface area. The level of biohydrogen production by bacterial consortium was observed and the results revealed a 8 cumulative hydrogen production of 1098 mL H 2 /L, HPR of 35.9 mL H 2 /h/L, and HY of 3.6 mL/H 2 /gVS(removal) utilizing co-substrates at pH 7.
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Fermentative hydrogen production
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Dark fermentation
Fermentative hydrogen production
Microbial electrolysis cell
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Biomass can be a sustainable choice for bioenergy production worldwide. Biohydrogen production using fermentative conversion of biomass has gained great interest during the last decade. Besides being an efficient transportation fuel, biohydrogen can also be also be a low-carbon source of heat and electricity. Microbes assisted conversion (bioconversion) can be take place either in presence or absence of light. This is called photo-fermentation or dark-fermentation respectively. This review provides an overview of approaches of fermentative hydrogen production. This includes: dark, photo and integrated fermentative modes of hydrogen production; the molecular basis behind its production and diverse range of its applicability industrially. Mechanistic understanding of the metabolic pathways involved in biomass-based fermentative hydrogen production are also reviewed.
Dark fermentation
Fermentative hydrogen production
Bioconversion
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Dark fermentation
Fermentative hydrogen production
Stoichiometry
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This study aims at investigating the influence of operational parameters on biohydrogen production from fruit-vegetable waste (FVW) via lactate-driven dark fermentation. Mesophilic batch fermentations were conducted at different pH (5.5, 6.0, 6.5, 7.0, and non-controlled), total solids (TS) contents (5, 7, and 9%) and initial cell biomass concentrations (18, 180, and 1800 mg VSS/L). Higher hydrogen yields and rates were attained with more neutral pH values and low TS concentrations, whereas higher biomass densities enabled higher production rates and avoided wide variations in hydrogen production. A marked lactate accumulation (still at neutral pH) in the fermentation broth was closely associated with hydrogen inhibition. In contrast, enhanced hydrogen productions matched with much lower lactate accumulations (even it was negligible in some fermentations) along with the acetate and butyrate co-production but not with carbohydrates removal. At pH 7, 5% TS, and 1800 mg VSS/L, 49.5 NmL-H
Dark fermentation
Fermentative hydrogen production
Mesophile
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The hydrogen can be produced in a biological production process by dark and photo-fermentation of organic substrates. Under anaerobic conditions, hydrogen is produced during conversion of organic substrate into organic acids using fermentative bacteria and during conversion of organic acids into H 2 and CO 2 using photo- fermentative bacteria. This bioprocess has been studied with a number of microorganisms, it is a very complex process and influenced by many factors. In order dark and photo-fermentation process is an important approach for bio-hydrogen production. In this study, different factors haves been examined to enhance biohydrogen production by these organisms, either as a combined or sequential using dark and photo-fermentation process. The effect of each factor on biohydrogen production efficiency is reported. A comparison of hydrogen production efficiency between dark-fermentation, photo-fermentation and two stage processes was investigated.
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Fermentative hydrogen production
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