An up-scaled biotechnological approach for phosphorus-depleted rye bran as animal feed

Side streams from the milling industry offer excellent nutritional properties for animal feed; yet their use is constrained by the elevated phosphorus (P) content, mainly in the form of phytate. Biotechnological P recovery fosters sustainable P management, transforming these streams into P-depleted animal feed through enzymatic hydrolysis. The enzymatic P mobilization not only enables P recovery from milling by-products but also supports the valorization of these streams into P-depleted animal feeds. Our study presents the scalability and applicability of the process and characterizes the resulting P-depleted rye bran as animal feed component. Batch mode investigations were conducted to mobilize P from 100 g to 37.1 kg of rye bran using bioreactors up to 400 L. P reductions of 89% to 92% (reducing from 12.7 gP/kg to 1.41–1.28 gP/kg) were achieved. In addition, High Performance Ion Chromatography (HPIC) analysis showed complete depletion of phytate. The successful recovery of the enzymatically mobilized P from the process wastewater by precipitation as struvite and calcium hydrogen phosphate is presented as well, achieving up to 99% removal efficiency. Our study demonstrates a versatile process that is easily adaptable, allowing for a seamless implementation on a larger scale. Graphical Abstract: (Figure presented.).

Subjects

Circular phosphorus bioeconomy

Phosphorus mobilization

Phosphorus recovery

Phosphorus reduced animal feed

Sustainability

Up-scaling

Valorization of plant byproducts

DDC Class

660.6: Biotechnology

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

s40643-024-00765-5.pdf

Type

Main Article

Size

1.99 MB

Format

Adobe PDF

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An up-scaled biotechnological approach for phosphorus-depleted rye bran as animal feed