Co-digestion of Food Waste and Switchgrass for Biogas Potential: Effects of Process Parameters

Uma, S.; Thalla, Arun Kumar; Devatha, C.P.

doi:10.1007/s12649-018-0508-2

Cited by 20 publications

(19 citation statements)

References 31 publications

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“…For the same substrate, Zamanzadeh et al [32] also observed better methane production (480 mL.g -1 SV) at 37 °C when compared to reactors operated at 55 °C (448 mL.g -1 SV). Various authors have reported superior performance of fermentative-methanogenic reactors conducted at mesophilic temperature in relation to thermophilic temperature, mainly when inoculated with a mesophilic microbial consortium, which may be related to the reduced adaptation ability of microbial groups to wide-ranging temperature variations [33,34]. For Chen and Chang [35], the ideal temperature range for the methanogenesis stage is from 35 to 42 °C, and an increase to 55 °C can especially inhibit the activity of methanogenic archaea, even after the acclimatization of mesophilic inoculum at 55 °C for 13 days.…”

Section: Resultsmentioning

confidence: 99%

Methane Production Using Brewery Spent Grain: Optimal Hydrothermolysis, Fermentation of Waste and Role of Microbial Populations

Gomes

Rabelo

Sakamoto

et al. 2021

Waste Biomass Valor

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The hydrothermolysis variables temperature (150 -210 °C) and time (10 -20 minutes) were assessed to improve hydrolysis e ciency of brewery spent grain (BSG) for renewable energy generation. The intensi cation of the pretreatment was expressed by the severity variation (2.8 -4.5) and the process was optimized with methane production of 411.6 ± 7.2 mL. g -1 STV (severity 4.2). The fermentationmethanogenesis of BSG and hydrolysate resulting from BSG hydrothermolysis process under severity of 4.2 (210 o C for 10 min.) was evaluated by central composite design (CCD) with the variables operation temperature (30 -60 °C), BSG concentration (7.3 -20.7 g.L -1 ) and hydrolysate (0 -12.4 mL). The higher methane production observed was 305.8 mL.g -1 STV, with 14 g.L -1 of BSG, without hydrolysate at 45 °C.The main soluble metabolites were acetic acid (233.17 mg.L -1 ) and butyric acid (156.0 mg.L -1 ). On other hand, the lower methane production (108.5 ± 2.0 mL. g -1 STV) veri ed was 14 g.L -1 of BSG, 6.5 mL of hydrolysate at 60 °C, which revealed that in this condition propionic acid (947.4 mg.L -1 ) and acetic acid (599.2 mg.L -1 ) were expressive. In the optimal fermentation-methanogenic condition of pretreated BSG, Macellibacteroides and Sphaerochaeta (15.9 and 14.7%, respectively) were identi ed, as well as archaea similar to Methanosaeta (80.4%), favoring the acetoclastic methanogenic pathway.

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Section: Resultsmentioning

confidence: 99%

Methane Production Using Brewery Spent Grain: Optimal Hydrothermolysis, Fermentation of Waste and Role of Microbial Populations

Gomes

Rabelo

Sakamoto

et al. 2021

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…STV). with a mesophilic microbial consortium, which may be related to the reduced adaptation ability of microbial groups to wide-ranging temperature variations [33,34]. For Chen and Chang [35], the ideal temperature range for the methanogenesis stage is from 35 to 42 °C, and an increase to 55 °C can especially inhibit the activity of methanogenic archaea, even after the acclimatization of mesophilic inoculum at 55 °C for 13 days.…”

Section: Resultsmentioning

confidence: 99%

Methane Production Using Brewery Spent Grain: Optimal Hydrothermolysis, Fermentation Of Waste And Role Of Microbial Populations

Gomes

Rabelo

Sakamoto³

et al. 2021

Preprint

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The hydrothermolysis variables temperature (150 - 210 °C) and time (10 - 20 minutes) were assessed to improve hydrolysis efficiency of brewery spent grain (BSG) for renewable energy generation. The intensification of the pretreatment was expressed by the severity variation (2.8 - 4.5) and the process was optimized with methane production of 411.6 ± 7.2 mL. g -1 STV (severity 4.2). The fermentation-methanogenesis of BSG and hydrolysate resulting from BSG hydrothermolysis process under severity of 4.2 (210 o C for 10 min.) was evaluated by central composite design (CCD) with the variables operation temperature (30 - 60 °C), BSG concentration (7.3 - 20.7 g.L -1 ) and hydrolysate (0 - 12.4 mL). The higher methane production observed was 305.8 mL.g -1 STV, with 14 g.L -1 of BSG, without hydrolysate at 45 °C. The main soluble metabolites were acetic acid (233.17 mg.L -1 ) and butyric acid (156.0 mg.L -1 ). On other hand, the lower methane production (108.5 ± 2.0 mL. g -1 STV) verified was 14 g.L -1 of BSG, 6.5 mL of hydrolysate at 60 °C, which revealed that in this condition propionic acid (947.4 mg.L -1 ) and acetic acid (599.2 mg.L -1 ) were expressive. In the optimal fermentation-methanogenic condition of pretreated BSG, Macellibacteroides and Sphaerochaeta (15.9 and 14.7%, respectively) were identified, as well as archaea similar to Methanosaeta (80.4%), favoring the acetoclastic methanogenic pathway.

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“…The level of pH in the bioreactors depends on the production and use of acid and alkalinity (Sarwar et al, 2018) (Uma, Thalla, & Devatha, 2020).…”

Section: Phmentioning

confidence: 99%

“…Therefore, high temperatures call for more energy investment, and higher process control to reach consistent and invariant temperature in the reactor. Moreover, thermophilic conditions could help in the acid formation in the bioreactor, constraining biogas production as a result (Náthia-Neves et al, 2018) (Uma et al, 2020).…”

Section: Phmentioning

confidence: 99%

Recent Advance in Anaerobic Co-digestion Technology: A Review

Rajaonison¹,

Rabesahala²,

Rakotondramiarana³

2020

MAS

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Due to their polluting characteristics, fossil fuels presently tend to be replaced by renewable energy resources. Anaerobic digestion is a recent technology for producing biofuels. As a biochemical method to produce biogas, it is more environmentally friendly than other processes and is almost non-polluting. The anaerobic co-digestion is an upgrade of the mono-digestion since some limitations of the single-substrate degradation were solved by digesting two or more substrates. The present review gives an overview of the progress made in the anaerobic co-digestion technology. Appearing as a complex technology, lots of factors can affect its operation. Those factors include the choice and the composition of the substrates, the ratio between the substrates and the inoculum, the pretreatment, the environmental conditions, the operational parameters, and the post-treatment at the end of the process. Analytical and empirical tools for the assessment of the whole system in terms of biodegradability and synergy of the substrates, the efficiency of the process, and the identification of the operation inhibitors are also presented in this paper.

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Co-digestion of Food Waste and Switchgrass for Biogas Potential: Effects of Process Parameters

Cited by 20 publications

References 31 publications

Methane Production Using Brewery Spent Grain: Optimal Hydrothermolysis, Fermentation of Waste and Role of Microbial Populations

Methane Production Using Brewery Spent Grain: Optimal Hydrothermolysis, Fermentation of Waste and Role of Microbial Populations

Methane Production Using Brewery Spent Grain: Optimal Hydrothermolysis, Fermentation Of Waste And Role Of Microbial Populations

Recent Advance in Anaerobic Co-digestion Technology: A Review

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