Valorization of raw brewers’ spent grain through the production of volatile fatty acids

Teixeira, Margarida Ribau; Guarda, Eliana C.; Freitas, Elisabete B.; Galinha, Cláudia F.; Duque, Anouk F.; Reis, Maria A.M.

doi:10.1016/j.nbt.2020.01.007

Cited by 46 publications

(29 citation statements)

References 42 publications

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“…All these features make the FW an interesting renewable source for VFA production. Different types of FW, such as solid waste of cafeteria [13,14], tuna waste [15], fruit pulp waste [1,16], cheese whey [8,17], sugar cane molasses [17], corn stalk [18], potato peel waste [19], FW rich in proteins [20], brewers' spent grain [21], mixture of different fractions of FW [22], FW from canteen [23,24], and vegetable wastes [25] have been used as feedstock in biological processes using mixed microbial cultures. Furthermore, FW can be also mixed with other wastes, like as waste activated sludge [26] and sewage sludge [27] to improve the biological process performance.…”

Section: Food Wastementioning

confidence: 99%

“…VFAs production from FW using mixed microbial cultures is mostly based on the use of suspended biomass. Thus, continuous stirred tank reactors (CSTR), stirred tank reactors (STR) and immersed membrane bioreactors are being applied for that purpose [1,15,21,22,33,34]. Those reactors are usually operated in a continuous mode.…”

Section: Production Of Volatile Fatty Acids (Vfas)mentioning

confidence: 99%

“…Those reactors are usually operated in a continuous mode. However, for FW needing high retention times to be converted into VFAs, they are often converted into batch and semi-continuous (fed-batch) reactors [15,19,21,[33][34][35][36][37][38].…”

Section: Production Of Volatile Fatty Acids (Vfas)mentioning

confidence: 99%

“…Acetic and valeric acids increased with the OLR, while propionic and butyric acids decreased with the OLR (Table 3). Teixeira et al, [21] studied the effect of OLR on VFA production using raw brewers' spent grain as feedstock and observed an increase of VFA concentration in about 2.5 times (Table 3). Regardless of the OLR, no significant effects on the VFA composition was observed, being propionic acid the dominant acid produced (Table 3).…”

Section: Organic Loading Rate (Olr)mentioning

confidence: 99%

“…The optimal HRT can vary even for the same feedstock [7]. Teixeira et al, [21] studied the effect of HRT (19 and 41 days) on the production of VFA at OLR of 4.3 gTS/(L.d). Due to the kind of substrate (solid and complex substrate without pre-treatment), high HRT was applied.…”

Section: Hydraulic Retention Time (Hrt)mentioning

confidence: 99%

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From Food Waste to Volatile Fatty Acids towards a Circular Economy

Carvalheira¹,

Duque²

2021

Fermentation - Processes, Benefits and Risks

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The food industrial sector generates large amounts of waste, which are often used for animal feed, for agriculture or landfilled. However, these wastes have a very reach composition in carbon and other compounds, which make them very attractive for valorization through biotechnological processes. Added value compounds, such as volatile fatty acids (VFAs), can be produced by anaerobic fermentation using pure cultures or mixed microbial cultures and food waste as carbon source. Research on valuable applications for VFAs, such as polyhydroxyalkanoates, bioenergy or biological nutrient removal, towards a circular economy is emerging. This enhances the sustainability and the economic value of food waste. This chapter reviews the various types of food waste used for VFAs production using mixed microbial cultures, the anaerobic processes, involved and the main applications for the produced VFAs. The main parameters affecting VFAs production are also discussed.

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Section: Food Wastementioning

confidence: 99%

Section: Production Of Volatile Fatty Acids (Vfas)mentioning

confidence: 99%

Section: Production Of Volatile Fatty Acids (Vfas)mentioning

confidence: 99%

Section: Organic Loading Rate (Olr)mentioning

confidence: 99%

Section: Hydraulic Retention Time (Hrt)mentioning

confidence: 99%

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From Food Waste to Volatile Fatty Acids towards a Circular Economy

Carvalheira¹,

Duque²

2021

Fermentation - Processes, Benefits and Risks

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A bibliometric analysis on potential uses of brewer's spent grains in a biorefinery for the circular economy transition of the beer industry

Ampese

Mussatto²,

Forster‐Carneiro

2021

Biofuels Bioprod Bioref

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This comprehensive review aims to elucidate the state of the art related to research trends regarding the use of brewer's spent grains (BSG), the main solid by-product generated in breweries. Its status, future opportunities, and emerging trends were evaluated by bibliometric analysis, which contributed to clarifying the knowledge and perspectives in the field. In total, 510 documents were obtained from the Web of Science© database in a timespan from 1900 to 2020. VosViewer software and R-bibliometrix package were used to investigate and map the most frequently cited papers, international collaborative networks, keywords, and the main countries and journals associated with this research. The results showed that, globally, 65 countries have been engaged in research related to BSG, and Brazil has been the most productive country, with up to 70 publications. Keyword analysis revealed that the studies on BSG are divided into four main knowledge areas: (i) pretreatment; (ii) nutritional quality; (iii) bioactive compounds, and (iv) pyrolysis. It was also found that a biorefinery can be designed for the complete utilization of BSG to obtain several valuable compounds. In this sense, different technological routes can be applied to produce arabinoxylans, proteins, ferulic acid, xylitol, xylose, lactic acid, butanol, biogas, fertilizer, and ethanol. In conclusion, BSG is a cost-effective and feasible raw material for the sustainable production of bio-based products and bioenergy and its valorization in a biorefinery is a powerful strategy to promote the circular economy transition of the beer industry.

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