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Explanation: I am not sure, but I found out about Zero Emissions Research Initiative (ZERI) which is actively using by-products of the brewing process to grow mushrooms. I looked up various pages of this institution, but found nothing else than the expression "grain residue for high value mushrooms". By using the grain waste of brewing, the production of mushrooms can be improved. Please have a look at the url below, or look up the homepage of ZERI. Maybe this helps to find a good translation.