Simultaneous hydrolysis and fermentation of unprocessed food waste into ethanol using thermophilic anaerobic bacteria

Dhiman, Saurabh Sudha; David, Aditi; Shrestha, Namita; Johnson, Glenn R.; Benjamin, Kenneth M.; Gadhamshetty, Venkataramana; Sani, Rajesh K.

doi:10.1016/j.biortech.2017.07.102

Cited by 30 publications

(3 citation statements)

References 25 publications

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“…Efficient valorization of the organic matrix in food waste into value-added chemicals and functional materials not only benefits the recycling of food waste but also helps achieve the reduction target of carbon emissions [5,6]. Anaerobic fermentation has been widely investigated 4 to convert food waste into high-value products [7][8][9][10]. This process involves the degradation of the organic components in food waste with microorganisms under anaerobic conditions, resulting in gaseous (methane and hydrogen) and liquid (carboxylic acids) products.…”

Section: Introductionmentioning

confidence: 99%

Selective hydrogenation of vanillin to vanillyl alcohol over Pd, Pt, and Au catalysts supported on an advanced nitrogen-containing carbon material produced from food waste

Guo

Gao

Remón

et al. 2022

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Selective hydrogenation of vanillin to vanillyl alcohol over Pd, Pt, and Au catalysts supported on an advanced nitrogen-containing carbon material produced from food waste

Guo

Gao

Remón

et al. 2022

Chemical Engineering Journal

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“…Many studies on the production of ethanol from FW and other organic waste have been conducted in a variety of areas. In particular, the effects of the composition of FW, effects of pretreatment prior to the fermentation process, types of enzymes, types of microorganisms used in ethanol production, and suitable operational conditions were investigated with the main goal of increasing ethanol productivity [13][14][15][16][17][18][19]. Even so, commercial production of bioethanol from second-generation feedstocks is being questioned for its cost-effectiveness in terms of both economic feasibility and energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Recovery from Food Waste by Co-Production of Bioethanol and Biomethane Process

et al. 2021

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The primary objective of this research is to study ways to increase the potential of energy production from food waste by co-production of bioethanol and biomethane. In the first step, the food waste was hydrolysed with an enzyme at different concentrations. By increasing the concentration of enzyme, the amount of reducing sugar produced increased, reaching a maximum amount of 0.49 g/g food waste. After 120 h of fermentation with Saccharomyces cerevisiae, nearly all reducing sugars in the hydrolysate were converted to ethanol, yielding 0.43–0.50 g ethanol/g reducing sugar, or 84.3–99.6% of theoretical yield. The solid residue from fermentation was subsequently subjected to anaerobic digestion, allowing the production of biomethane, which reached a maximum yield of 264.53 ± 2.3 mL/g VS. This results in a gross energy output of 9.57 GJ, which is considered a nearly 58% increase in total energy obtained, compared to ethanol production alone. This study shows that food waste is a raw material with high energy production potential that could be further developed into a promising energy source. Not only does this benefit energy production, but it also lowers the cost of food waste disposal, reduces greenhouse gas emissions, and is a sustainable energy production approach.

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“…Commonly used substrates for microbial fermentation are simple sugars such as glucose and sucrose. Solid organic wastes (SOWs) such as food and paper waste, and agricultural wastes (such as corn stover) produced by anthropogenic activities, are abundant substrates that can be converted to intermediate or end-use bioproducts using microbial metabolism [2,3]. An enriched microbial consortium consisting of different microbial groups with diverse functions can degrade these SOWs into value-added end products or platform chemicals.…”

Section: Introductionmentioning

confidence: 99%

Acetate Production from Cafeteria Wastes and Corn Stover Using a Thermophilic Anaerobic Consortium: A Prelude Study for the Use of Acetate for the Production of Value-Added Products

2020

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Efficient and sustainable biochemical production using low-cost waste assumes considerable industrial and ecological importance. Solid organic wastes (SOWs) are inexpensive, abundantly available resources and their bioconversion to volatile fatty acids, especially acetate, aids in relieving the requirements of pure sugars for microbial biochemical productions in industries. Acetate production from SOW that utilizes the organic carbon of these wastes is used as an efficient solid waste reduction strategy if the environmental factors are optimized. This study screens and optimizes influential factors (physical and chemical) for acetate production by a thermophilic acetogenic consortium using two SOWs—cafeteria wastes and corn stover. The screening experiment revealed significant effects of temperature, bromoethane sulfonate, and shaking on acetate production. Temperature, medium pH, and C:N ratio were further optimized using statistical optimization with response surface methodology. The maximum acetate concentration of 8061 mg L−1 (>200% improvement) was achieved at temperature, pH, and C:N ratio of 60 °C, 6, 25, respectively, and acetate accounted for more than 85% of metabolites. This study also demonstrated the feasibility of using acetate-rich fermentate (obtained from SOWs) as a substrate for the growth of industrially relevant yeast Yarrowia lipolytica, which can convert acetate into higher-value biochemicals.

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Simultaneous hydrolysis and fermentation of unprocessed food waste into ethanol using thermophilic anaerobic bacteria

Cited by 30 publications

References 25 publications

Selective hydrogenation of vanillin to vanillyl alcohol over Pd, Pt, and Au catalysts supported on an advanced nitrogen-containing carbon material produced from food waste

Selective hydrogenation of vanillin to vanillyl alcohol over Pd, Pt, and Au catalysts supported on an advanced nitrogen-containing carbon material produced from food waste

Enhanced Energy Recovery from Food Waste by Co-Production of Bioethanol and Biomethane Process

Acetate Production from Cafeteria Wastes and Corn Stover Using a Thermophilic Anaerobic Consortium: A Prelude Study for the Use of Acetate for the Production of Value-Added Products

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