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Detailed Explanation of Value-Added Processing Technology for Potato Starch Waste Liquid

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The waste liquid from potato starch production is rich in nutrients, and it is a pity to discard it, while it also pollutes the environment. People have attempted to process potato starch waste liquid for use in the food industry, but have hesitated because the treated starch juice has a peculiar off-flavor unique to potatoes. To effectively utilize potato juice, a new process using glucose invertase treatment has emerged in recent years, which not only effectively removes the unpleasant taste from the juice, but also yields a product rich in sugars, amino acids, organic acids, minerals and other nutrients, which can be used as

The waste liquid from potato starch production is rich in nutrients, and it is a pity to discard it, while it also pollutes the environment. People have attempted to process potato starch waste liquid for use in the food industry, but have hesitated because the treated starch juice has a peculiar off-flavor unique to potatoes. To effectively utilize potato juice, a new process using glucose invertase treatment has emerged in recent years, which not only effectively removes the unpleasant taste from the juice, but also yields a product rich in sugars, amino acids, organic acids, minerals and other nutrients, which can be widely used as a food additive in biscuits, pastries, beverages and Western-style desserts, fully meeting food hygiene requirements.

I. Process Flow: Potato starch waste liquid, heating and concentration, ion exchange resin treatment -> activated carbon treatment -> glucose invertase treatment -> drying -> white powder or granular finished product

II. Operating Steps

1. Heating and Concentration: The waste liquid collected from the potato starch production line is heated and concentrated, the coagulated protein is filtered out and recovered, and the deproteinized liquid is separated and sent to the next process.

2. Ion Exchange Resin Treatment: There are two methods: the batch method or the tower conversion method. For the resin, styrene-based anion exchange resin is preferred. In the batch method, activated ion exchange resin is mixed with the deproteinized liquid. The amount of resin used is generally 50 grams per 1 liter of liquid to be treated, and the mixing time generally must be maintained for 1-1.5 hours. Through oscillation and stirring, the two are brought into full contact with each other, and the odor and colored substances in the deproteinized liquid adhere to the ion exchange resin and are removed together with the resin at scheduled replacement intervals; in the tower conversion method, activated ion exchange resin is packed into a tower. The deproteinized liquid flows in from the upper part of the tower, and after fully adsorbing odor and colored substances through the resin, flows out from the lower part of the tower.

3. Activated Carbon Treatment: The method is the same as above.

4. Glucose Invertase Treatment: The above juice that has been deproteinized, deodorized and decolorized is fed into a fermentation tank. The amount of glucose invertase added is generally about 0.2% of the weight of the juice, and the acidity of the treated liquid is generally controlled at a pH value of 5.0-5.5. To effectively stabilize the weakly acidic environment of the enzymatic process, an appropriate amount of glucose or the like may be added as a buffer. The enzymatic temperature is preferably in the range of 40-55°C. The enzymatic time varies depending on factors such as the amount of invertase added, the enzymatic temperature and the pH value, and generally takes about 15-24 hours to complete. The deproteinized liquid after enzymatic treatment is a transparent liquid.

5. Drying: The potato juice treated through the above steps can already be directly added to food; if required for packaging, transportation or food production needs, additives such as starch, dextrin, gelatin and soy protein may also be further added, and through spray drying or vacuum drying treatment, it is made into powder or granular form and sealed for packaging.

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