Brewery Waste as Renewable Energy Source

  • ChemPubSoc Europe Logo
  • Author: Cordula Buse
  • Published Date: 17 March 2017
  • Source / Publisher: Chemical Engineering & Technology/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Brewery Waste as Renewable Energy Source

Brewer's spent grains (BSG) are a by-product of beer production that is traditionally used as animal feed. But due to an ongoing decline in demand and to legal constraints for disposal, other solutions are required. Unfortunately, the high water content of BSG and the contamination with protein and ash make an economic treatment difficult. However, since many breweries try to shift their energy supply to renewable sources and since BSG are available throughout the whole year, an energetic usage is of particular interest.

Andreas Weger, Fraunhofer Institute for Environmental, Safety, and Energy Technology (UMSICHT), Oberhausen, Germany, and colleagues propose a combination of mechanical, biological, and thermal methods to process BSG. A mechanical pre-treatment with a screw press reduces the overall water content and transfers digestible components such as fat and proteins into the press water. The press cake is then co-incinerated with wood chips while the press water is digested to biogas.

An economic analysis reveals that although the energetic output is not enough to completely cover the energy requirements of a brewery, the process works efficiently, costs are competitive compared with heating oil prices, and greenhouse gas emissions can be reduced. Overall, this strategy could be a promising incentive to implement a renewable energy supply strategy at breweries.


Article Views: 1510

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

CONNECT: on Facebook on Twitter on YouTube on LinkedIn Sign up for our free newsletter

A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH