OkaraSoybean Powder
Okara is a by-product of soya milk/bean curd production and is soya residue. It has little demand in a food market and it goes bad quickly. Most of it is destroyed as an industrial waste,the cost of which represents a significant expense for manufacturers of soya milk/bean curd. Thanks to the worldwide health boom, the soymilk market in western countries is rapidly expanding. However, the problem of industrial waste stays the same as in Japan. Commercialization of the high nutritious by-product would helpreduce disposal costs and improvement of the company’s image. Drying of a by-product is a big theme all over the world. Our direct heating flash dryer, Drymeister, has been delivered to soya milk manufacturers around the world.
Process
The mail challenge in processing the by-product (Okara) is its high moisture content of 80%. It quickly decays, and its heavy weight and sticky nature make it difficult to process. Because of these difficulties, among the annual production of Okara, less than 5% is used as an ingredient for food, 45% is used for animal feed or fertilizer, and the remaining 50% is destroyed by incineration.
However, the health benefits of soyabean by-products are significant. Therefore, there is a significant advantage in applying it as a food ingredient, fertilizer, or animal feed.
Merit of recycling a soybean by-product
Reduce disposal costs: US$200 to 300/ton, annually ten to hundred thousand US$
Profit from selling recycled product (especially for human food as high value added food, fertilizer, and animal feed)
Environmentally friendly business
Better company image
For recycling Okara, it has to be dried and ground to suitable transportation and storage. The Drymeister is the most recommendable dryer for this application. Fine dried product can be obtained continuously at the short process time without any sticking problem.
System
Drymeister is provided with the milling part at the bottom and the classifier at the top of the dryer. Hot air is induced to the bottom of the machine. Three operations: milling, classifying and drying are conducted simultaneously. Feed material is milled and classified in the hot air stream. Fine, dry particles pass through the classifier, and the product is collected by bag filter. Drymeister has strong milling power, so the particle size and moisture content can be controlled easily. The product from Drymeister fulfills the requirements listed below for food and for high value-added recycling products.
1. Color and flavor – Short drying time without heat damage. It is imprtant issue for human food.
2. Improvement of food texture – Fine milling by strong milling force
3. Long storage life – Low moisture content by high drying ability
4. Inhibiting bacterial growth – Less adhesion and easy cleaning. Shortened process by one-pass operation.
Fine grinding of the dried product improves the solubility of nutrients and accelerates digestion and absorption. It reveals further possibilities for new value-added applications.
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