Efficient ethanol production from kitchen and garden wastes and biogas from the residues

Karimi, Shiva; Karimi, Keikhosro

doi:10.1016/j.jclepro.2018.03.172

Cited by 56 publications

(16 citation statements)

References 28 publications

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“…Meanwhile, continuous production (Scenario 2) where all hydrolysate was processed into ethanol fermentation and then fermentation solid residues were used to produce biomethane produced higher total bioethanol and biomethane of 318 L and 80 m 3 , respectively, corresponding to gross energy output of 9.57 GJ, equivalent to 299 L of gasoline. The gross energy outputs produced in both scenarios are slightly higher than outputs reported in previous research by Karimi and Karimi (2018) [51], where co-production of ethanol and biogas from kitchen and garden wastes yielded a maximum gasoline equivalent of 162.1 L/ton waste. However, these gross energy outputs were comparable to those reported by Papa et al (2015) [52] in which the energy recovery obtained from the co-production of bioethanol and biomethane from corn stover and switchgrass pretreated with mild ionic liquid was higher than that pretreated with pressurized hot water, ranging from 8.8-10.9 GJ/ton biomass.…”

Section: Gross Energy Outputcontrasting

confidence: 68%

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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Section: Gross Energy Outputcontrasting

confidence: 68%

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

et al. 2021

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“…In this context, various pretreatment methods have been recently reviewed by Tabatabaei et al [12]. For instance, dilute sulfuric acid pretreatment was applied for biogas production from garden wastes in co-digestion with biomass of the fungi: Mucor indicus [36]. Sodium hydroxide successfully improved anaerobic biogas production from corn stover [37], birch, spruce [38], and maize stalk [39].…”

Section: Pretreatment An Essential Step Prior To Admentioning

confidence: 99%

Pretreatment of lignocelluloses for enhanced biogas production: A review on influencing mechanisms and the importance of microbial diversity

Mirmohamadsadeghi

Karimi

Azarbaijani

et al. 2021

Renewable and Sustainable Energy Reviews

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150

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“…The analysis revealed higher swelling capacity in case of microwave-alkali pretreatment as compared to alkali-only pretreatment (Tables 1 and 2). The water swelling capacity of pretreated substrate increased the pore volume of the surface that could hold more water compared to the untreated substrate, resulting in an increased accessibility of the hydrolytic enzyme/microbes, which could be reason for enhanced biomethanation in the pretreated KR 32,33 . The same logical view is supported through the substrate disruption patterns as observed in the electron photomicrograph (Fig.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic molecular insights to enhancement of biogas production from kitchen refuse using alkaline-microwave pretreatment

Singh

Verma

Ojha

et al. 2019

Sci Rep

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The current study analyzed and optimized the concentration of NaOH for alkaline pretreatment of kitchen refuse for biogas production. Also, the benefits of microwave assistance in enhanced biogasification of kitchen refuse were evaluated. The TS, VS and structural changes were compared using standard experimental techniques. Molecular dynamics was investigated for the molecular level changes leading to higher biogasification in NaOHmicrowave combined pretreatment. The methane and biogas yields were calculated to validate the benefits of microwave assistance in efficient biogasification. The NaOH-microwave combined pretreatment showed higher VS production. Microwave treatment degraded and removed lignin more efficiently. Molecular dynamics studies revealed the induction of configurational instability in lignin and cellulose molecules with variable temperatures. The methane and biogas production increased with 6% NaOH concentration, and decreased at higher NaOH concentration till 10%. Microwave assistance declined the required NaOH concentration further to 4%. Thus, as compared to 6% NaOH concentration required for an efficient pretreatment, the kitchen refuse was efficiently pretreated with 4% NaOH concentration when combined with a 30 min duration microwaving. The experimental and computational data provided a detailed analysis proposing an optimized, novel and promising method to pretreat kitchen refuse for efficient and enhanced biogas production.

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Efficient ethanol production from kitchen and garden wastes and biogas from the residues

Cited by 56 publications

References 28 publications

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

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

Pretreatment of lignocelluloses for enhanced biogas production: A review on influencing mechanisms and the importance of microbial diversity

Intrinsic molecular insights to enhancement of biogas production from kitchen refuse using alkaline-microwave pretreatment

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