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Potato potato residue can make protein feed
In recent years, a team of researchers from Harbin Institute of Technology has achieved significant progress in the development of single-cell protein (SCP) feed using spent potato residues. Their work not only involved identifying the most effective combinations of microbial strains for SCP production but also led to the design and implementation of a full-scale production process tailored for converting potato waste into valuable protein feed. A key innovation was the introduction of using liquid residue from potato juice as a medium for SCP production—a method that has now been successfully applied both domestically and internationally.
China produces over 7 million tons of potatoes annually, with more than 340 million tons of starch residues generated in the processing stage. These residues are rich in cellulose, hemicellulose, and crude proteins, containing a well-balanced amino acid profile. The crude protein content in the resulting SCP can reach up to 40-50%, making it highly beneficial for promoting growth in livestock and poultry. Compared to plant-based protein feeds, this SCP offers superior biological value. However, due to the lack of efficient treatment technologies, a large portion of these potato residues remains underutilized, leading to environmental pollution from both solid waste and wastewater generated during starch extraction.
Professor Yang Qian from the Institute of Biological Engineering at Harbin Institute of Technology spearheaded this research since 2004, supported by funding from the National Natural Science Foundation of China and the Ministry of Science and Technology’s Science and Technology Support Program. The team focused on using potato starch processing byproducts as the primary raw material, employing yeast and other fungal strains to develop a screening strategy for high-efficiency SCP-producing microorganisms. Through extensive testing, they identified eight promising strains and optimized fermentation conditions to ensure maximum yield and quality. They also established a complete production process for SCP from potato residues, which has been thoroughly evaluated by authoritative agencies, paving the way for future industrial application.
To date, the project has resulted in two national invention patents being filed, and several cooperation agreements have been signed with major potato processing companies. This indicates strong potential for commercialization and sustainable use of potato waste, offering a promising solution to both resource utilization and environmental protection challenges.