JPS6248351A - Dehydration of starch refuse - Google Patents

Abstract

PURPOSE:To enable effective dehydration of starch refuse, by adding a substance generating metallic ion such as metal oxide, metallic salt, etc., to a starch refuse to effect the contraction of the starch refuse texture, and pressing the mixture. CONSTITUTION:Starch refuse left after the extraction of starch from potato, etc., is mixed with a substance generating metallic ion such as metal oxide, metallic salt, etc., to effect the contraction of the texture of the above refuse, and the mixture is dehydrated by pressing. Since the dehydrated starch refuse produced by the above process has low water-content (decreased from about 97% to about 90%) and has decreased weight and volume, the handling and treatment of the refuse is facilitated. The refuse can be used for various uses, such as the feed for domestic animal. The transporation cost can be reduced remarkably in the case of disposal.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a method for dehydrating starch meal.

([J) Prior Art Conventionally, the remaining starch lees from which starch is extracted from potatoes, etc., are semi-fluid and contain about 97 to 98% human water due to the water used during the starch extraction process. Moreover, this water permeates into the cell tissue of the lees and causes the tissue to swell, making it difficult to separate the tissue from the water even when compressed pressure is applied, making dehydration difficult. Ta.

(c) Problems that the invention aims to solve As a result, the volume and weight are large, and while the composition has the potential to be recycled, it is difficult to utilize it, and even if it is disposed of in the Kanto region,
It was a cumbersome product that was semi-liquid and expensive to handle, as well as shipping costs.

(d) Means for solving the problem In this invention, a substance that generates metal ions such as metal oxides and total salts is mixed into the starch meal containing a large amount of water left after starch is extracted from potatoes etc. , it is an object of the present invention to provide a method for dehydrating starch lees, which is characterized in that the lees is dehydrated by aggregating the structure of the lees and then subjecting the lees to compression treatment.

(E) Effect According to this invention, by applying metal ions to the starch meal, the cell tissue in the starch meal converges, and the water that has permeated into the tissue is discharged to the outside of the tissue. The dehydration effect is enhanced by the compression process.

(F) Effect: The starch meal thus dehydrated has a low water content, and has reduced labor and volume, making it easier to handle and process later, and can be used for various purposes, such as livestock feed, etc. This also has the effect of greatly reducing the costs required for transportation, etc., even when disposing of the waste.

(g) Examples Examples of the present invention will be described in detail as follows.

Starch lees are derived during the starch manufacturing process, and the raw material, such as potatoes, is ground, and the ground material is poured into a large amount of water and stirred to wash out the starch from the raw material structure, and then washed with a mesh net, etc. Starch-containing water and starch lees are separated, and starch is extracted from the same water by a static sedimentation method or a centrifugal separation method, and the starch lees absorbs water and swells by the above-mentioned underwater stirring. Cell tissue contains approximately 97% to 98% water.

The water that has penetrated into the swollen cell tissue is strongly bound to the same tissue, so it is difficult to separate and dehydrate this water using mechanical squeezing force. The surface is covered with a viscous organic substance produced by the swelling, and during press dehydration treatment, this viscous substance clogs the filter cloth, etc., making the press dehydration process even more difficult.

In the present invention, approximately 2% by weight of slaked lime, which is a metal ion generating substance, is mixed into the starch meal and stirred to condense the cell tissue swollen with water, and the water in the tissue is discharged to the outside. It is a method in which starch meal, which is an aggregate of condensed cell tissues, is compressed and dehydrated.

In the compression dehydration process, the starch lees is sealed in a squeeze bag made of filter cloth and dehydrated by applying a pressure of about 20 kg per square meter from the outside. The ratio is reduced to about 90%.

By reducing the moisture content from 97% to 90% as described above, the volume and weight are each reduced by about 1/3, and what is more, the semi-fluid property that is difficult to handle becomes fluid. It is easy to handle and can be stacked without any problems.

In addition, for the L [squeezing and dehydration treatment, the starch cake before the dehydration treatment is semi-fluid, and a filter press using a snake pump or the like, or an Oliver dehydration filter, etc. can also be used.
In this case as well, substantially the same results as above are obtained.

The starch meal thus dehydrated can be used as feed for livestock.In order to further increase its value as feed, the starch meal can be fermented with microorganisms to increase its digestibility. The carbon dioxide gas generated during this process neutralizes the slaked lime and turns it into calcium carbonate, which is suitable for feed for pigs and the like.

Claims (1)

[Claims] 1) After extracting starch from potatoes, etc., the remaining starch lees is mixed with substances that generate metal ions, such as metal oxides and metal salts, to make the structure of the lees astringent, and then the lees is compressed and dehydrated. A method for dehydrating starch meal characterized by the following.