Effect of thermophilic temperatures on hydrogen and ethanol production in anaerobic fluidized bed reactor from cassava wastewater

Tavares, Thiago de Gois Araújo; Peiter, Fernanda Santana; Chaves, Taciana Carneiro; Gois, Georgia Nayane Silva Belo; Amorim, Eduardo Lucena Cavalcante de

doi:10.1007/s43153-022-00222-w

Cited by 8 publications

(2 citation statements)

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“…However, the traditional pretreatment method for inoculum sludge is mainly dependent on heat treatment, which can reduce the activity of methanogens and restrain the hydrogen-consuming bacteria, and at the same time, the operation reduces the abundance of the bacterial community. Thermophilic dark fermentation hydrogen production without heat pretreatment was recently explored . Although the efficiency of hydrogen production and start-up was over a month, this process could reduce ∼30% energy consumption comparing to traditional photo fermentation and maintain the biodiversity of microorganism community .…”

Section: Introductionmentioning

confidence: 99%

“…Thermophilic dark fermentation hydrogen production without heat pretreatment was recently explored. 13 Although the efficiency of hydrogen production and start-up was over a month, this process could reduce ∼30% energy consumption comparing to traditional photo fermentation and maintain the biodiversity of microorganism community. 14 Thus, with its efficient start-up and operation, a thermophilic dark fermentation hydrogen production system without heat pretreatment has good potential for application and development.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%