Effect of acid-pretreatment on hydrogen fermentation of food waste: Microbial community analysis by next generation sequencing

Kim, Dong-Hoon; Jang, Su-Jin; Yun, Yeo-Myeong; Lee, Chang Kyu; Moon, Christina H.; Kang, Won-Seok; Kwak, Seung-Shin; Kim, Mi-Sun

doi:10.1016/j.ijhydene.2014.08.004

Cited by 75 publications

(27 citation statements)

References 34 publications

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“…Therefore, it is necessary to develop and optimize technologies that allow a proper treatment of this biowaste. Anaerobic processes stand as a well-established technology that permits an effective and environmental-friendly treatment of waste and its valorization in the form of several products, such as biomethane, biohydrogen, alcohols or volatile fatty acids (VFAs) (Banks et al, 2012;Kim et al, 2014;Wang et al, 2015). Particularly, anaerobic digestion (AD) in dry conditions (> 20 % total solids; TS) is a promising alternative, due to several advantages when compared to wet digestion, e.g.…”

Section: Introductionmentioning

confidence: 99%

Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

Capson-Tojo

Trably

Rouez

et al. 2017

Bioresource Technology

107

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The increasing food waste production calls for developing efficient technologies for its treatment. Anaerobic processes provide an effective waste valorization. The influence of the initial substrate load on the performance of batch dry anaerobic co-digestion reactors treating food waste and cardboard was investigated. The load was varied by modifying the substrate to inoculum ratio (S/X), the total solids content and the co-digestion proportions. The results showed that the S/X was a crucial parameter. Within the tested values (0.25, 1 and 4gVS·gVS), only the reactors working at 0.25 produced methane. Methanosarcina was the main archaea, indicating its importance for efficient methanogenesis. Acidogenic fermentation was predominant at higher S/X, producing hydrogen and other metabolites. Higher substrate conversions (≤48%) and hydrogen yields (≤62mL·gVS) were achieved at low loads. This study suggests that different value-added compounds can be produced in dry conditions, with the initial substrate load as easy-to-control operational parameter.

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Section: Introductionmentioning

confidence: 99%

Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

Capson-Tojo

Trably

Rouez

et al. 2017

Bioresource Technology

107

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“…In addition, cow dung is a kind of natural mixed microflora including undigested cellulose and hemicellulose and a variety of bacteria fed by cellulose and hemicellulose. Therefore, not only H 2 ‐producing bacteria consumes the CS but other bacteria can also decompose the CS to supply the whole microflora in the dark‐fermentation step . The result indicates that the synergistic effect of different bacteria in cow dung is beneficial to improving H 2 production from CS.…”

Section: Resultsmentioning

confidence: 97%

“…Therefore, not only H 2 -producing bacteria consumes the CS but other bacteria can also decompose the CS to supply the whole microflora in the dark-fermentation step. 34 The result indicates that the synergistic effect of different bacteria in cow dung 35 is beneficial to improving H 2 production from CS. The main dark-fermentative products were acetate, butyrate, and a small number of ethanol, indicating that this dark-fermentation type is the mixed fermentation based on acetate and butyrate.…”

Section: Dark Fermentation In the Two-step Fermentative Hydrogen Prmentioning

confidence: 95%

Enhanced biohydrogen production from cornstalk through a two-step fermentation: Dark fermentation and photofermentation

Guo

Wang

et al. 2017

Int J Energy Res

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Summary The pretreated cornstalk (CS) was employed for biohydrogen production through combining dark‐fermentative bacteria, cow dung, and photosynthetic bacteria, Rhodobacter capsulatus mutant in this work. In the first step, the cornstalk was pretreated with 0.75% NaOH, 12 IU/g‐CS cellulase, and 2400 IU/g‐CS hemicellulase under different hydrolysis time and temperature. The reducing sugar yields were very close under different conditions, and its maximum was 0.51 ± 0.01 g/g‐CS at hydrolysis 108°C for 2.0 hours. However, the H2 yield of dark fermentation enhanced with the increasing hydrolysis time and temperature, and the maximum was 156.7 ± 8.6 mL/g‐CS at hydrolysis 126°C for 2.0 hours. The biogas was only H2 and CO2, and no methane was found. In the second step, R. capsulatus ZYHAB3 with the mutation on both hvrA and hupAB genes was obtained from wild type (R. capsulatus SB1003) and the inactivation of both hvrA and hupAB genes remarkably enhanced nitrogenase activity. When the dark‐fermentation effluent was employed as a substrate, the H2 yield and maximum H2 evolution rate of ZYHAB3 were 2827.5 ± 283.5 mL/L and 40.9 ± 2.3 mL/(Lh), which increased by 44.5 and 39.1% compared with those of wild type, respectively. The high H2 yield of 439.4 mL/g‐CS was obtained from pretreated cornstalk through the 2‐step process, and the chemical oxygen demand removal rate achieved 90.6%. The results suggest that combining cow dung and R. capsulatus mutant (hvrA− hupAB−) could be a promising way to produce H2 form agricultural wastes.

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“…Similar studies were done by others authors to a better understanding of the metabolic production by microbial community knowledge. Kim et al [67] found that C. acetobutylicum was the dominant species during H 2 fermentation of food waste in a specific pH condition (pH range 1.0-3.0). Reddy et al [68], when studying a bioprocess for conversion of ethanol and SCCA into MCCA using enriched mixed culture with C. kluyveri observed predominantly Clostridia, Sphingobacteriales, Desulfobacteraceae and Bacillus groups in the bioaugmented mixed culture.…”

Section: Dgge Analysismentioning

confidence: 99%

Production of medium-chain carboxylic acids by anaerobic fermentation of glycerol using a bioaugmented open culture

Dams

Viana

Guilherme

et al. 2018

Biomass and Bioenergy

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Biological production of carboxylic acids during glycerol fermentation via the chain elongation process was investigated. Glycerol is a by-product of the biodiesel production process and a convenient feedstock alternative for the carboxylate platform. In batch experiments, glycerol was used as substrate, whereas sludge (granular and flocculent) and ruminal liquid served as inocula. To improve the production of carboxylates, bioaugmentation with Clostridium acetobutylicum ATCC 824 was performed. Maximal production of n-caproic and n-caprylic acids was achieved with the use of the granular sludge. Bioaugmentation with C. acetobutylicum enhanced production of n-caproic acid in the presence of 100 mM ethanol. However, increasing ethanol concentration to 200 mM had no further enhancing effect on n-caproic production with or without bioaugmentation. The enhancement of ncaproic acid production was probably due to the increased production of n-butyric acid by C. acetobutylicum, because n-butyric acid is an important intermediate in the chain elongation process when ethanol is used as an electron donor.

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Effect of acid-pretreatment on hydrogen fermentation of food waste: Microbial community analysis by next generation sequencing

Cited by 75 publications

References 34 publications

Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

Enhanced biohydrogen production from cornstalk through a two-step fermentation: Dark fermentation and photofermentation

Production of medium-chain carboxylic acids by anaerobic fermentation of glycerol using a bioaugmented open culture

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