The biotransformation of brewer’s spent grain into biogas by anaerobic microbial communities

Malakhova, D.V.; Егорова, М.А.; Prokudina, Ljuba I.; Нетрусов, А.И.; Цавкелова, Е. А.

doi:10.1007/s11274-015-1951-x

Cited by 30 publications

(18 citation statements)

References 39 publications

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“…Around 10% of spent grain is used to produce biogas, and the remaining 20% is landfilled. Every tonne of spent grain in a landfill releases 513 kg CO 2 equivalent of greenhouse gases 8 .…”

mentioning

confidence: 99%

Rearing substrate impacts growth and macronutrient composition of Hermetia illucens (L.) (Diptera: Stratiomyidae) larvae produced at an industrial scale

Scala

Cammack

Salvia

et al. 2020

Sci Rep

138

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Organic waste is a rapidly increasing problem due to the growth of the agricultural production needed to meet global food demands. Development of sustainable waste management solutions is essential. Black soldier fly, Hermetia illucens (L.) (Diptera: Stratiomyidae) (BSF), larvae are voracious consumers of a wide range of organic materials ranging from fruits and vegetables to animal remains, and manure. Thanks to this ability and considering the larval high protein and lipid content, BSF larvae are a useful additive in animal feeds and biodiesel production. Unfortunately, the feasibility of using the black soldier fly as a tool for waste valorization and feed production has primarily been investigated at the benchtop scale. Thus, mobilization of current practices to an industrial scale is challenging because scaling up from small laboratory studies to large industrial studies is not necessarily linear. The goal of this study was to demonstrate the ability of the BSF to recycle organic waste at an industrial scale. To accomplish this goal, three organic waste streams were used (e.g., apples, bananas, and spent grain from a brewery) to test six diet treatments (1) apple, (2) banana, (3) spent grain, (4) apple and banana, (5) apple and spent grain, and (6) banana and spent grain. Working at scale of 10,000 BSF larvae life history traits, waste valorization, protein and lipid profiles were measured for each diet treatment. Differences were recorded across all variables, except substrate conversion, for larvae fed on fruit and spent grain (alone or with fruit). Growth rate significantly differed across treatments; larvae reared on spent grain grew twice as fast as those fed apples alone, but those reared on the apple and spent grain mixture produced twice as much insect biomass. However, it should be noted that larvae resulting from the apple diet contained 50% more fat than larvae fed the fruit and spent grain mixtures. Commonly-available organic wastes were successfully used at an industrial scale to produce BSF larvae that have the potential to substitute other sources of protein and lipids in different industrial applications. Industrialization efforts are encouraged to assess these impacts when integrating diverse ingredients into larval diets as a means to more precisely predict output, such as larval development time and final larval biomass.

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“…Around 10% of spent grain is used to produce biogas, and the remaining 20% is landfilled. Every tonne of spent grain in a landfill releases 513 kg CO 2 equivalent of greenhouse gases 8 .…”

mentioning

confidence: 99%

Rearing substrate impacts growth and macronutrient composition of Hermetia illucens (L.) (Diptera: Stratiomyidae) larvae produced at an industrial scale

Scala

Cammack

Salvia

et al. 2020

Sci Rep

138

View full text Add to dashboard Cite

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“…The afored-mentioned problems might be overcome in the co-digestion process. Thus far, this substrate has been successfully co-digested with Jerusalem artichoke phytomass (Malakhova et al, 2015), cattle dung (Tewelde et al, 2012), cow dung and pig manure (Poulsen, Adelard & Wells, 2017) as well as monoazo dye and glucose/sodium acetate (Gonçalves et al, 2015). Due to its composition and significant biogas potential, it may also be co-digested with SS.…”

Section: Introductionmentioning

confidence: 99%

The effect of brewery spent grain application on biogas yields and kinetics in co-digestion with sewage sludge

Szaja

Montusiewicz

Lebiocka

et al. 2020

PeerJ

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The present study examines the effect of introducing dried brewery spent grain (BSG), known as the main solid by-product of the brewery industry on biogas yields and kinetics in co-digestion with sewage sludge (SS). The experiment was conducted in semi-continuous anaerobic reactors (supplied once a day) operating under mesophilic conditions (35°C) at different hydraulic retention times (HRT) of 18 and 20 d. In co-digestion runs, the BSG mass to the feed volume ratio was constant and maintained 1:10.The results indicated that the addition of BSG did not influence the biogas production, by comparison with SS mono-digestion (control run). At HRT of 18 d, in the co-digestion run, the average methane yield was 0.27 m3 kg/VSadded, while in the control run the higher value of 0.29 m3 kg/VSaddedwas observed. However, there was no difference in terms of statistical significance. At HRT of 20 d, the methane yield was 0.21 m3 kg/VSadded for both mono- and co-digestion runs. In the BSG presence, the decrease in kinetic constant values was observed. As compared to SS mono-digestion, reductions by 21 and 35% were found at HRT of 20 and 18 d, respectively. However, due to the supplementation of the feedstock with BSG rich in organic compounds, the significantly enhanced energy profits were achieved with the highest value of approx. 40% and related to the longer HRT of 20 d. Importantly, the mono- and co-digestion process proceeded in stable manner. Therefore, the anaerobic co-digestion of SS and BSG might be considered as a cost-effective solution that could contribute to the energy self-efficiency of wastewater treatment plants (WWTPs) and sustainable waste management for breweries.

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“…Its supply can often exceed its demand 2 , and excess BSG is deposited in landfill 5 . BSG has therefore been utilized as a feedstock for the production of other value-added bioproducts such as lactic acid, ethanol and biogas 6–8 .…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of biocontrol fertilizer from brewer’s spent grain via solid-state fermentation

Qiu

et al. 2019

Sci Rep

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Brewer’s spent grain (BSG) is a promising substrate for the production of biocontrol fertilizer (BF). The effects of temperature, water content and fermentation time on the conidiation and germination rate of the entomopathogenic fungi Beauveria bassiana (BbQLU1) were modeled in a 3 × 3 × 3 factorially designed experiment. The optimum conditions for BF production (60% water content at 25 °C for 12 days) resulted in a conidiation of 0.85 × 108 spores/g and a germination rate of 98.68%. BF at a concentration of 1 × 10−2 g/ml prompted plant growth and exhibited high toxicity against Galleria mellonella with an LT50 of 3.6 days. GC-MS analysis found 2-piperidone; benzoic acid, 3-methyl-, methyl ester; and other compounds to be potentially related to the toxicity and enhanced plant growth. These findings provide substantial evidence to support the production of BF.

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The biotransformation of brewer’s spent grain into biogas by anaerobic microbial communities

Cited by 30 publications

References 39 publications

Rearing substrate impacts growth and macronutrient composition of Hermetia illucens (L.) (Diptera: Stratiomyidae) larvae produced at an industrial scale

Rearing substrate impacts growth and macronutrient composition of Hermetia illucens (L.) (Diptera: Stratiomyidae) larvae produced at an industrial scale

The effect of brewery spent grain application on biogas yields and kinetics in co-digestion with sewage sludge

Production and characterization of biocontrol fertilizer from brewer’s spent grain via solid-state fermentation

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