Sustainable valorisation pathways mitigating environmental pollution from brewers’ spent grains

Kavalopoulos, Michael; Stoumpou, Vasileia; Christofi, Andreas; Mai, Sofia; Barampouti, Elli Maria; Μουστάκας, Κωνσταντίνος; Malamis, Dimitris; Loizidou, Maria

doi:10.1016/j.envpol.2020.116069

Cited by 46 publications

(33 citation statements)

References 40 publications

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“…Similarly, according to Colombi et al [45] , phenolic compounds at a concentration between 0. [20] where low solubilization of BSG, low lignin degradation and high polysaccharides degradation were observed when acid pretreatment was applied on BSG. Similar results have also been reported elsewhere in literature.…”

Section: Chemical Pretreatmentmentioning

confidence: 98%

“…Alkaline pretreatment with NaOH at 50 o C was chosen as pretreatment method for SCG and dilute acid pretreatment (dilute H 2 SO 4 ) was applied for BSG samples at 50 o C in line with our previous work [20,24]. In both cases, the severity of pretreatment (concentration of chemicals (0.5, 1N), pretreatment duration (5h, 16h)) was studied.…”

Section: Chemical Pretreatmentmentioning

confidence: 99%

“…Although in literature high ethanol yields for BSG have been reported [49], they signi cantly vary depending on the processes applied. In general, it is well established that harsh pretreatment conditions favour ethanol production [20], but at the same time they induce severe cost and safety issues.…”

Section: Ethanol Productionmentioning

confidence: 99%

“…Pretreatment is an essential step in the bioconversion route, that degrades the recalcitrant lignocellulosic bers and facilitates the subsequent step of enzymatic hydrolysis. Among the pretreatment techniques most commonly reported for BSG and SCG (alkaline, acidic, steam explosion, ionic liquid [19,20] alkaline pretreatment appears more effective in conditioning the lignocellulosic biomass and partially decrystallizing cellulose, thereby increasing the accessible surface area for hydrolytic enzymes [21], whereas acid pretreatment has also been reported as a fast and e cient pretreatment method in some cases [22]. Regarding fermentation of both substrates, an investigation of a variety of yeasts (Saccharomyces cerevisiae, Pichia stipites, Kluvyveromyces fragilis) [23] has outlined S. cerevisiae as the strain providing generally the highest ethanol yields.…”

Section: Introductionmentioning

confidence: 99%

“…According to our previous work SCG and BSG has the potential to be valorised for bioediesel and bioethanol production [20,24,25]. It has been proved that this is feasible when chemical pretreatment is applied; alkaline pretreatment for SCG and dilute acid for BCG.…”

Section: Introductionmentioning

confidence: 99%

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Emerging Synergies on the Co-treatment of Spent Coffee Grounds and Brewer’s Spent Grains for Ethanol Production

Barampouti

Grammatikos

Stoumpou

et al. 2021

Waste Biomass Valor

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Purpose: Given that the depletion of fossil fuels is an important issue that should be tackled urgently, alternative routes are being sought for biofuels production. This paper, under this context, studied the potential synergies of co-treatment of two kinds of agro-waste (brewers' spent grains, BSG and spent coffee grounds, SCG) towards the direction of biodiesel and bioethanol production, alleviating at the same time their treatment and management issues. Methods: The technical feasibility of oil extraction and ethanol production was studied and optimized in both laboratory and bench scale. A treatment train including alkaline pretreatment of SCG and dilute acid pretreatment of BSG, neutralization of the solutions by mixing them, enzymatic sacchari cation and ethanolic fermentation led to the production of bioethanol.Results: The co-treatment of BSG and SCG proved bene cial and optimum experimental conditions were de ned by setting the bioethanol production cost as optimization parameter. The lowest ethanol production cost (3.9€/kg) was observed for scenario 4 (SCG/BSG mixture, chemical pretreatment (0.5N, 5h), enzymatic hydrolysis (400 μL/g cellulose, 16h)) and scenario 5 (SCG/BSG mixture, chemical pretreatment (0.5N, 5h), enzymatic hydrolysis (800 μL/g cellulose, 5h)). Further upscaling of the process veri ed the technical feasibility of process units leading to a further increase of ethanol yield and thus a decrease in the production cost.Conclusion: Conclusively, it was demonstrated that the recovery and extraction of the oil content of BSG and SCG and the achievement of high ethanol yields is technically feasible. Within this context, an integrated biore nery was presented, making evident that these substrates could reverse the eminent energy crisis via biofuels production. Statement Of NoveltyThe novelty of this work is the co-treatment of two agro-wastes (spent coffee grounds and brewers' spent grains) towards biodiesel and bioethanol production. To our knowledge, the experimental set-up including the acidic pretreatment of BSG and the alkaline pretreatment of SCG followed by the enzymatic hydrolysis of the mixture was examined for the rst time during this study. The main bene ts of the co-treatment are the absence of a neutralisation stage avoiding the respective cost and the improved e ciencies of the bioprocesses. Based on the lab and bench scale experiments and a preliminary cost analysis presented, a biore nery conceptual design is proposed where the synergistic effect of the co-treatment was made evident. Thus, this innovative process will allow to mitigate the adverse environmental impacts of fossil fuels without affecting with the entire food chain.

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Section: Chemical Pretreatmentmentioning

confidence: 98%

Section: Chemical Pretreatmentmentioning

confidence: 99%

Section: Ethanol Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Emerging Synergies on the Co-treatment of Spent Coffee Grounds and Brewer’s Spent Grains for Ethanol Production

Barampouti

Grammatikos

Stoumpou

et al. 2021

Waste Biomass Valor

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Conversion of brewers’ spent grain into proteinaceous animal feed using solid state fermentation

Eliopoulos

Arapoglou²,

Chorianopoulos³

et al. 2021

Environ Sci Pollut Res

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Brewers' Spent Grain (BSG) represents the 85% of the total residue produced during the beer brewing process, with a global annual production volume exceeding the 30 Mtons. Study herein concerns the application of solid state fermentation (SSF) process for the e cient transformation of BSG into high nutritional value animal feed. The investigated SSF procedure was initiated by Pleurotus ostreatus, which constitutes a natural source of β-glucans and metabolites (vitamins, nutrients). Thus, it is possible to reduce the environmental impacts caused by BSG production and simultaneously contribute to the tackling of proteinaceous animal feed shortage observed during the last decade. The method developed resulted in a signi cant increase of protein content by 49.49%, a 10-fold increase of their 1,3 − 1,6 βglucans content and a respective reduction of cellulose content by 11.42%. The application of this method is expected to provide a solid background for the utilization of BSG as substrate for fungi initiated SSF, a bioprocess allowing the signi cant reduction of the environmental impact caused by the beer brewing industry and simultaneously produce animal feed with high protein content and nutritional characteristics suitable for ful lling animals' nutritional needs and improving their welfare.

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Versatile Applications of Brewer’s Spent Grain: Solid-State Fermentation and Nutritional Added Value

Lock,

Mah,

Lai

2023

Appl Biochem Biotechnol

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Sustainable valorisation pathways mitigating environmental pollution from brewers’ spent grains

Cited by 46 publications

References 40 publications

Emerging Synergies on the Co-treatment of Spent Coffee Grounds and Brewer’s Spent Grains for Ethanol Production

Emerging Synergies on the Co-treatment of Spent Coffee Grounds and Brewer’s Spent Grains for Ethanol Production

Conversion of brewers’ spent grain into proteinaceous animal feed using solid state fermentation

Versatile Applications of Brewer’s Spent Grain: Solid-State Fermentation and Nutritional Added Value

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