Improved dark fermentation of cane molasses in mesophilic and thermophilic anaerobic fluidized bed reactors by selecting operational conditions

Ferreira, Tiago Borges; Rego, Gabriel Catucci; Ramos, Lucas Rodrigues; Menezes, Camila Aparecida de; Silva, Edson Luiz

doi:10.1002/er.5673

Cited by 25 publications

(4 citation statements)

References 48 publications

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“…thermosaccharolyticum strain CT72. Generally, high-temperature conditions are suitable for the growth of thermophilic butyrate-producing bacteria and butyric-acid-type fermentation. − Although the thermophilic temperature was also investigated in this study, the fermentation type was mostly the acetic acid type in stage V, which can be attributed to the dominant microorganism, T. thermosaccharolyticum strain CT72, which produces hydrogen in thermophilic acetic-acid-type fermentation.…”

Section: Resultsmentioning

confidence: 94%

Enhanced Thermophilic Hydrogen Production by an Enriched Novel Acetic-Acid-Type Fermentative Bacterium from Inoculum Sludge with Nonheat Pretreatment

Yin,

Wang,

Guo

et al. 2024

Energy Fuels

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Biological hydrogen production from renewable biomass based on anaerobic dark fermentation is an environmentally friendly process. However, the hydrogen production efficiency was not ideal and the start-up time was always long for dark fermentation systems, which limits the development of biohydrogen production. In this study, a novel mild preculture method which regulates substrate concentration without controlling pH was used to enhance hydrogen production efficiency and accelerate the start-up process under thermophilic conditions. We regulated the substrate concentration from 2000 to 8000 mg COD/L without controlling the pH and performed a nonheat pretreatment (>90 °C) of inoculum sludge at 55 °C using an SBR anaerobic reactor. The reaction process of hydrogen production was divided into eight stages according to different COD concentrations. The experimental results indicated that the reactor quickly became stable on the 12th day, while the maximum hydrogen yield of 3.68 mol of H 2 /mol of glucose was obtained in the fifth stage, with the optimal COD of 5500 mg/L, and the maximum COD removal efficiency of 39.61% was achieved in the fourth stage, with a COD of 5000 mg/L. Microorganism community structure analysis showed that Thermoanaerobacterium was the dominant species throughout the process of hydrogen production. In particular, a novel hydrogen-producing bacterium of acetic-acid-type fermentation, Thermoanaerobacterium thermosaccharolyticum strain CT72, was successfully enriched and exhibited excellent capacity for hydrogen production under thermophilic conditions.

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Section: Resultsmentioning

confidence: 94%

Enhanced Thermophilic Hydrogen Production by an Enriched Novel Acetic-Acid-Type Fermentative Bacterium from Inoculum Sludge with Nonheat Pretreatment

Yin,

Wang,

Guo

et al. 2024

Energy Fuels

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“…Different operational factors affect the fermentation process, yield, composition and concentration of VFAs produced from industrial and municipal waste (Lee et al 2014). Some of these operational factors include pH, temperature, retention time, additives, inoculum type, and substrate type (Ferreira et al 2020). Researchers investigated the factors mentioned above individually, and very few researchers investigated the interactive effects of some of these operational parameters (Lee et al 2014).…”

Section: Operating Conditions Affecting Dark Fermentation and Vfa Pro...mentioning

confidence: 99%

Resource Recovery From Municipal and Industrial Organic Waste: The Effect of Substrate Type on Anaerobic Fermentation, Biological Denitrification, and Anaerobic Digestion

Mahmoud

2024

Preprint

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This study aims to recover volatile fatty acids (VFAs) from the anaerobic fermentation of industrial and municipal waste and investigate the effectiveness of using the produced VFAs as carbon sources for denitrification and as feedstocks for methane production via anaerobic digestion (AD) process. Six different wastes were used in this study, three industrial wastes: bakery processing and kitchen waste (BP+KW), whey powder (WP) and fat, oil, and grease (FOG), and three municipal wastes: food waste (FW), primary sludge (PS), and thickened waste activated sludge (TWAS). The experimental results showed that WP exhibited the maximum VFAs yield of 266 mg COD/ gTCOD added. In the denitrification experiments, all the fermentation filtrates exhibited higher specific denitrification rates (SDNRs) than conventional external carbon sources (i.e., methanol and acetate), with WP filtrate having the highest SDNR of 17.3 mg NOx-N/gVSS/hr. In the AD experiment, BP+KW and WP exhibited the highest methane yields of 354 and 350 mL CH4/ gTCOD added,respectively.

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“…Moreover, various organic acids and other compounds with different applications (foods, pharmaceuticals, and chemicals) can be generated during the biological production of hydrogen. Most studies have reported that biohydrogen production generates intermediates such as acetic acid, propionic acid, butyric acid, succinic acid, formic acid, butanediol, and acetone [15][16][17][18][19][20]. These compounds are of special interest because of their high market value [21,22], especially butyric and lactic acid, which are used as precursors of industrial thermoplastics [23] and biodegradable polymers [24,25].…”

Section: Introductionmentioning

confidence: 99%

Acidogenesis of Pentose Liquor to Produce Biohydrogen and Organic Acids Integrated with 1G–2G Ethanol Production in Sugarcane Biorefineries

Peixoto

Mockaitis

Moreira

et al. 2023

Waste

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Second-generation (2G) ethanol production has been increasingly evaluated, and the use of sugarcane bagasse as feedstock has enabled the integration of this process with first-generation (1G) ethanol production from sugarcane. The pretreatment of bagasse generates pentose liquor as a by-product, which can be anaerobically processed to recover energy and value-added chemicals. The potential to produce biohydrogen and organic acids from pentose liquor was assessed using a mesophilic (25 °C) upflow anaerobic packed-bed bioreactor in this study. An average organic loading rate of 11.1 g COD·L−1·d−1 was applied in the reactor, resulting in a low biohydrogen production rate of 120 mL·L−1 d−1. Meanwhile, high lactate (38.6 g·d−1), acetate (31.4 g·d−1), propionate (50.1 g·d−1), and butyrate (50.3 g·d−1) production rates were concomitantly obtained. Preliminary analyses indicated that the full-scale application of this anaerobic acidogenic technology for hydrogen production in a medium-sized 2G ethanol distillery would have the potential to completely fuel 56 hydrogen-powered vehicles per day. An increase of 24.3% was estimated over the economic potential by means of chemical production, whereas an 8.1% increase was calculated if organic acids were converted into methane for cogeneration (806.73 MWh). In addition, 62.7 and 74.7% of excess organic matter from the 2G ethanol waste stream could be removed with the extraction of organic acid as chemical commodities or their utilization as a substrate for biomethane generation, respectively.

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Improved dark fermentation of cane molasses in mesophilic and thermophilic anaerobic fluidized bed reactors by selecting operational conditions

Abstract: Improved dark fermentation of cane molasses in mesophilic and thermophilic anaerobic fluidized bed reactors by selecting operational conditions.

Cited by 25 publications

References 48 publications

Enhanced Thermophilic Hydrogen Production by an Enriched Novel Acetic-Acid-Type Fermentative Bacterium from Inoculum Sludge with Nonheat Pretreatment

Enhanced Thermophilic Hydrogen Production by an Enriched Novel Acetic-Acid-Type Fermentative Bacterium from Inoculum Sludge with Nonheat Pretreatment

Resource Recovery From Municipal and Industrial Organic Waste: The Effect of Substrate Type on Anaerobic Fermentation, Biological Denitrification, and Anaerobic Digestion

Acidogenesis of Pentose Liquor to Produce Biohydrogen and Organic Acids Integrated with 1G–2G Ethanol Production in Sugarcane Biorefineries

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