JPS591399B2 - Industrial waste drying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drying industrial waste.

Conventionally, the only methods for drying industrial waste containing water have been to simply heat dry it or mechanically squeeze out the moisture using a squeezer, but depending on the content of the industrial waste, either method is completely There are some products that cannot be dehydrated or dried, and even if the drying process is completed, a large amount of cost is required, resulting in expensive treatment costs.

In this invention, generally industrial waste, including waste related to industries such as fisheries and livestock, can be dried using a simple method Q, and the dried product can be effectively used as feed, etc. It is an object of the present invention to provide a method for drying industrial waste that can be processed so that it can be used.

To explain in detail the embodiments of this invention, the object to be treated is industrial waste, and the industrial waste includes waste from the fisheries industry such as frozen surimi, fish paste products, and fish paste. Wastes from the livestock processing industry such as meal, food processing, and meatball meal; wastes from urban industries such as urban residue, urban drainage sludge, and pulp sludge; and all other food-related wastes that are organic.

Starchy substances are mixed into these industrial wastes to be treated and heated.

The starchy substance may be of any kind, such as rice flour or rice flour, and when such a starchy substance is mixed into industrial waste, water in the waste is absorbed by the starchy substance.

That is, it utilizes the water-absorbing nature of starchy substances, and the proportion of starchy substances mixed in varies depending on the water content of industrial waste.

If starchy substances are mixed into industrial waste and heated at approximately 78°C, the starchy substances will swell and become glue-like, forming the so-called alpha state, which is then heated at a higher temperature. This evaporates water and solidifies the starchy material.

In other words, it utilizes the water absorption effect when starchy substances change from alpha to beta, and this principle is the same as the principle of making bread by dissolving American flour in water and baking it.
The starchy material is baked to complete solidification.

Therefore, since the dried material processed in this way is bound by beta starch, there is no risk of the dried industrial waste separating or crumbling from the mass of the material. This makes it difficult to disperse.

In addition to the method of heating the starchy material combined with industrial waste from the outside in a certain container, the heating method is to mix quicklime (Cab) into the starch material and mix it with the water absorbed by the starchy material. There is a method of heating by making use of the reaction in which quicklime (Cab) reacts with quicklime (Cab) to become slaked lime (Ca(OH)2).

In this method, quicklime, starch, and industrial waste are mixed together, and the heat generated when quicklime turns into slaked lime is induced within the mixture, so heating from the outside is not possible. The solidification of starch occurs more efficiently than in the case of starch, and operations such as stirring are not required at all when solidifying starch.

In addition, slaked lime, which is converted from quicklime, is converted to calcium carbonate by the carbon dioxide (CO2) generated when industrial waste is heated, but since this calcium carbonate is an effective feed supplement, food waste is added to industrial waste. When used, excellent feed can be produced.

The starchy substances combined with the industrial waste that have been heated and solidified in this way are completely dried, the water in the industrial waste is dehydrated, and the industrial waste is combined with the starchy substances. It is in a solid state, and by pulverizing it, it can be used as feed, etc.

According to the present invention, water in industrial waste is absorbed by the starch material using the water absorption effect that occurs when the starch material changes from the α state to the β state, and is made into a paste-like state, and further,
It is easy to process industrial waste because it takes advantage of the fact that when quicklime absorbs water and becomes slaked lime, the starchy substance in the α state ages and hardens into the β state when it is heated. It is possible to completely dry any kind of industrial waste using this method, and since the treated industrial waste contains starchy substances that cannot be used as feed, it is possible to completely dry it by fermentation or drying. This has the effect of enabling subsequent effective use.

In particular, after the drying process, starch is used as a binder to prevent lumps of the dried product from falling apart, making it easier to take out and transport the product.

Claims (1)

[Claims] 1. By mixing industrial waste with starch mixed with quicklime, the water in the industrial waste is absorbed by the quicklime and starch, and the heat generated when quicklime absorbs the absorbed starch and becomes slaked lime. A method for drying industrial waste, which is characterized in that the entire mixture is dried and solidified by the water absorption action during α-ization and then β-ization.