Integrated system approach to dark fermentative biohydrogen production for enhanced yield, energy efficiency and substrate recovery

Sekoai, Patrick T.; Yoro, Kelvin O.; Bodunrin, Michael Oluwatosin; Ayeni, Augustine O.; Daramola, Michael O.

doi:10.1007/s11157-018-9474-1

Cited by 34 publications

(21 citation statements)

References 194 publications

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“…62 , 63 It also comprises complex syntrophic microbial communities which participate during the four stages of anaerobic digestion (hydrolysis, acidogenesis, acetogenesis, and methanogenesis). 64 …”

Section: Results and Discussionmentioning

confidence: 99%

Thermophilic Biogas Upgrading via ex Situ Addition of H₂ and CO₂ Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

et al. 2020

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Bioconversion of renewable H 2 and waste CO 2 using methanogenic archaea is a promising technology for obtaining high-purity CH 4 , which can serve as an alternative for natural gas. This process is known as ex situ biogas upgrading. This work highlights the pathway toward the bioconversion of renewable H 2 and CO 2 into high-purity biomethane by exploiting highly accessible agro-municipal residues: cow manure (CM) and the organic fraction of solid municipal waste (OFSMW), which used to be called “waste materials”. More specifically, an ex situ thermophilic (55 °C) biogas upgrading process was conducted by CM and OFSMW codigestion at different mass proportions: 100:0, 80:20, 70:30, 60:40, and 50:50. Maximum CH 4 concentrations of 92–97 vol % and biogas volumetric production rates of 4954–6605 NmL/L.d were obtained from a batch reactor of 3 L working volume. Feedstock characterization, pH monitoring, and the carbon-to-nitrogen ratio were critical parameters to evaluate during biogas upgrading experiments. In this work, the usefulness of agro-municipal substrates is highlighted by producing high-purity biomethane—an energetic chemical to facilitate renewable energy conversion, which supports various end-use applications. This process therefore provides a solution to renewable energy storage challenges and future sustainable and green energy supply.

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Section: Results and Discussionmentioning

confidence: 99%

Thermophilic Biogas Upgrading via ex Situ Addition of H₂ and CO₂ Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

et al. 2020

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“…Meanwhile, Wuet al [10] said that biohydrogen production is two-times greater when alginate beads are enhanced with activated carbon. Nonetheless, even though alginate beads have been widely used in immobilisation, they are reported to still suffer from certain limitations like weak mechanical strength and reduced porosity [11,12]. Therefore, several approaches have been studied to improve the permeability and mechanical stability of alginate matrices, such as incorporating other materials like cellulose, metal, and carbon sources.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alginate and Chitosan on Activated Carbon as Immobilisation Beads in Biohydrogen Production

et al. 2020

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In this study, the effects of alginate and chitosan as entrapped materials in the biofilm formation of microbial attachment on activated carbon was determined for biohydrogen production. Five different batch fermentations, consisting of mixed concentration alginate (Alg), were carried out in a bioreactor at temperature of 60 °C and pH 6.0, using granular activated carbon (GAC) as a primer for cell attachment and colonisation. It was found that the highest hydrogen production rate (HPR) of the GAC–Alg beads was 2.47 ± 0.47 mmol H2/l.h, and the H2 yield of 2.09 ± 0.22 mol H2/mol sugar was obtained at the ratio of 2 g/L of Alg concentration. Next, the effect of chitosan (C) as an external polymer layer of the GAC–Alg beads was investigated as an alternative approach to protecting the microbial population in the biofilm in a robust environment. The formation of GAC with Alg and chitosan (GAC–AlgC) beads gave the highest HPR of 0.93 ± 0.05 mmol H2/l.h, and H2 yield of 1.11 ± 0.35 mol H2/mol sugar was found at 2 g/L of C concentration. Hydrogen production using GAC-attached biofilm seems promising to achieve consistent HPRs at higher temperatures, using Alg as immobilised bead material, which has indicated a positive response in promoting the growth of hydrogen-producing bacteria and providing excellent conditions for microorganisms to grow and colonise high bacterial loads in a bioreactor.

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“…In recent years, some pretreatment processes for facilitating enzyme/bacteria to access biomass substrate have been studied progressively [9]. The pretreatment process was applied to cleave the hindrance of biomass convolution and simultaneously guarantee the sufficient release of fermentable sugars to be metabolized to biofuel [10].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Enzymatic Digestibility of Coconut Husk using Nitrogen-assisted Subcritical Water for Sugar Production

Muharja

Fadhilah

Nurtono

et al. 2019

Bull. Chem. React. Eng. Catal.

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Coconut husk (CCH) as an abundant agricultural waste in Indonesia has the potential to be utilized for sugar production, which is the intermediate product of biofuel. In this study, subcritical water (SCW) assisted by nitrogen (N2) was developed to enhance the enzymatic hydrolysis of CCH. SCW process was optimized by varying the operation condition: the pressure of 60-100 bar, the temperature of 150-190 °C, and the time of 20-60 min. The SCW-treated solid was subsequently hydrolyzed by utilizing a mixture of commercial cellulase and xylanase enzymes. The result shows that the optimum total sugar yield was obtained under the mild condition of SCW treatment, resulting in the sugar of 15.67 % and 10.31 % gained after SCW and enzymatic hydrolysis process, respectively. SEM and FTIR analysis of SCW-treated solid exhibited the deformation of lignin and solubilization of cellulose and hemicellulose, while XRD and TGA revealed an increase of the amount of crystalline part in the solid residue. The use of N2 in SCW treatment combined with enzymatic hydrolysis in this study suggested that the method can be considered economically for biofuel production from CCH waste in commercial scale. Copyright © 2020 BCREC Group. All rights reserved

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Integrated system approach to dark fermentative biohydrogen production for enhanced yield, energy efficiency and substrate recovery

Cited by 34 publications

References 194 publications

Thermophilic Biogas Upgrading via ex Situ Addition of H₂ and CO₂ Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

Thermophilic Biogas Upgrading via ex Situ Addition of H₂ and CO₂ Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

Effects of Alginate and Chitosan on Activated Carbon as Immobilisation Beads in Biohydrogen Production

Enhancing Enzymatic Digestibility of Coconut Husk using Nitrogen-assisted Subcritical Water for Sugar Production

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Integrated system approach to dark fermentative biohydrogen production for enhanced yield, energy efficiency and substrate recovery

Cited by 34 publications

References 194 publications

Thermophilic Biogas Upgrading via ex Situ Addition of H2 and CO2 Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

Thermophilic Biogas Upgrading via ex Situ Addition of H2 and CO2 Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

Effects of Alginate and Chitosan on Activated Carbon as Immobilisation Beads in Biohydrogen Production

Enhancing Enzymatic Digestibility of Coconut Husk using Nitrogen-assisted Subcritical Water for Sugar Production

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Product

Resources

About

Thermophilic Biogas Upgrading via ex Situ Addition of H₂ and CO₂ Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

Thermophilic Biogas Upgrading via ex Situ Addition of H₂ and CO₂ Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste