Incineration of Solid Food Waste: A Project About Spent Grain

Für Biertreber, das mengenmäßig größte Nebenprodukt im Brauprozess, soll als Zwischenstand eines laufenden Forschungsprojekts ein über den bekannten Stand der bisherigen Trebernutzung hinausgehender Verwertungspfad vorgestellt werden. Der Fokus liegt hierbei auf einer anpassbaren, selektiven Abtrennung der noch enthaltenen Wertstoffe aus dem Treberpresswasser. Es werden Versuche zur gezielten Abtrennung der Inhaltsstoffe für eine spätere stoffliche Nutzung mittels Mikro-, Ultra-und Nanofiltration vorgestellt. Die Eignung verschiedener Membranen wird dabei basierend auf der erreichten Permeabilität sowie dem Rückhalt von Wertkomponentenklassen wie Proteinen und Polyphenolen bewertet. Es konnte u. a. gezeigt werden, dass bei der Mikrofiltration mithilfe einer rotierenden Membran Permeatflüsse im Bereich der kommerziellen Bierfiltration erreichbar sind.A new utilization concept for brewers' spent grains, the main byproduct of the brewing industry, is introduced. First results from an ongoing research project beyond the actual state of the art of brewers' spent grains usage are presented. It is focused on developing an adaptable selective separation procedure of valuable components from press water arising by mechanical dewatering of brewers' spent grains for the use as food additive. Experimental results on micro-, ultra-and nanofiltration for specific separation of the ingredients focused on substance classes are presented. The membrane applicability is evaluated by the membrane permeability and by the retention of valuable components like proteins and polyphenols. Results showed that the microfiltration of press water with a rotating membrane is comparable to commercial beer microfiltration in terms of permeate flux.

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“…Mit kontinuierlichen Pressen könnten noch etwas höhere TS‐Gehalte erreicht werden: ca. 42 % mit Bandpressen und ca. 45 % mit Schneckenpressen .…”

Section: Methodenunclassified

Neuer stofflicher Nutzungspfad von Treberpresswasser aus Biertreber unter Einsatz von Membrantrenntechnik in Lebens‐ oder Nahrungsergänzungsmitteln

Grahl

Beitlich

Fechter

et al. 2019

Chemie Ingenieur Technik

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“…If BSG is diverted to landfill, the addition of this highly fermentable waste increases the already unmanaged anaerobic fermentation there, where greenhouse gases, such as carbon dioxide and methane, are emitted [ 8 ]. Other potential avenues have been proposed for the re-routing of BSG as a byproduct, including those reviewed by Mussatto et al, [ 5 ], such as including building materials [ 9 ], charcoal [ 5 ], material for paper manufacture [ 10 ], and energy generation through direct combustion [ 11 ], and others as reviewed by Jackowski et al, [ 12 ], including hydrothermal carbonization for energy generation and soil amendments.…”

Section: Introductionmentioning

confidence: 99%

“…However, none of these have yet been implemented widely, primarily due to the high moisture content of BSG as it exits the brewery. At 75–80% dry basis moisture content [ 13 ] and as drying can be costly [ 14 ], it has not been considered appropriate for combustion-based energy generation [ 11 ]. Coupled with the dispersed geographical nature of breweries, substantial financial and energetic costs would be incurred in transportation to a disposal or processing facility.…”

Section: Introductionmentioning

confidence: 99%

Fungal Biovalorization of a Brewing Industry Byproduct, Brewer’s Spent Grain: A Review

Marcus¹,

Fox²

2021

Foods

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The beer industry is a major producer of solid waste globally, primarily in the form of brewer’s spent grain (BSG), which due to its low value has historically been diverted to livestock as feed or to landfills. However, its high moisture content and chemical composition positions BSG as an ideal candidate for further processing with microbial fermentation. Recent research has focused on filamentous fungi and the ability of some species therein to degrade the predominant recalcitrant cellulolignin components of BSG to produce valuable compounds. Many species have been investigated to biovalorize this waste stream, including those in the genuses Aspergillus, Penicillium, Rhyzopus, and Trichoderma, which have been used to produce a wide array of highly valuable enzymes and other functional compounds, and to increase the nutritional value of BSG as an animal feed. This review of recent developments in the application of filamentous fungi for the valorization of BSG discusses the biochemical makeup of BSG, the biological mechanisms underlying fungi’s primacy to this application, and the current applications of fungi in this realm.

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