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The Recycled Utilization Method of Potato Starchy Processing Waste

Author: LiangChunLi
Tutor: ChenJinChun
School: Beijing University of Chemical Technology
Course: Microbial and Biochemical Pharmacy
Keywords: Potato starch wastewater Slag Coupling process Protein Extraction Waste Processing
CLC: S532
Type: Master's thesis
Year: 2010
Downloads: 228
Quote: 2
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Abstract


In recent years, with the rapid development of the processing industry of potato starch, potato starch waste water, slag processing increasingly attracted attention. In this paper, potato starch production waste, waste of two recycling pathways. One is the use of the Rhizopus oryzae liquid fermentation processing potato starch wastewater, waste, and in the fermentation process using coupled ion exchange resin separation process of the lactic acid from the fermentation broth. The success of this method is the elimination of the product of lactic acid on the meters Rhizopus growth and fermentation inhibition, increased acid production. Reducing the COD value of the fermentation broth. The second for the introduction of a series of protein extraction method from potato waste liquid extracted the potato family protein and protease inhibitor, and determination of the inhibitory activity of a protease inhibitor, to achieve the purpose of the use of waste. The experimental analysis of potato waste, waste constituents, potato starch residue rich in nutrients, protein content of 0.83% up to 1.68%, the protein content of the concentrated liquid waste. Waste, waste mixed production of lactic acid as a fermentation medium can also be extracted from potato protein liquid waste as feed protein, and further isolated and purified potato proteinase inhibitor. The treated wastewater is then combined with other wastewater treatment, to achieve the purpose of recycling or discharge. Experiment achieved the following results: (1) Rhizopus oryzae fermentation production of lactic acid process used in the coupling process successful elimination product of lactic acid on the meters Rhizopus growth and fermentation inhibited acid production reached 12.59 g / L glucose conversion rate 79.9%, to improve than the CaCO3 add method yields nearly 21%. The total sugar content before and after fermentation decreased by 19.6% to 3.8%, effectively reducing the wastewater, the sugar content of the residues. (2) isoelectric point sedimentation, centrifugation, heating, and other methods successfully extracted from the effluent of potato protein, and further purified to obtain a protease inhibitor, the determination of trypsin activity inhibition percentage of 76.82%. (3) to the the potato waste liquid after the removal of protein using activated carbon adsorption technology makes the starch waste liquid COD value to a total decrease of 30.2%. Therefore, the use the coupled fermentation process to improve the production of lactic acid, the acid fermentation provides a new idea. Acid precipitation, heating and other processes can not only extract the protein, but also played the effect of starch wastewater purification.

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