JPS6168189A - Treatment of waste rice washing water or the like - Google Patents

Abstract

PURPOSE:To separate easily and completely proteins and starch by dispersing fine powder such as rice powder into the waste washing water of rice for SAKE brewing, liquefying starch in the liquid by liquefying enzyme, and separating the materials into insoluble vegetable proteins and insoluble liquefied starch. CONSTITUTION:A liquid mixture in a mixer 15 is sent into homomixers 19 and 19, sufficiently agitated until the solid component is transformed into proteins and fine particles of solid starch, heated by a heater 22 at 90-100 deg.C, and kept warm by a heating and decomposing machine 23. The dispersed liquid of proteins is sent into a tank 24, lactic acid is added to the liquid to regulate the pH to 4.4-4.8, and the liquid is oxidized. The liquid is then sent to a filter press 27, and filtered at low pressure. The filtrate (a) obtained from the filtration is stored in a filtrate tank 28 as the material for SAKE brewing. Meanwhile, cake A is mixed with fresh-water in a mixer 31, and sent to a dehydrator 34 wherein solid is again separated from liquid. The cake B formed in the dehydrator is washed with water, dehydrated, and dried by a drier 37 to obtain a high-purity protein product.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for treating rice washing wastewater and/or soaking water produced during sake brewing.

Conventional technology and its problems In the sake brewing process, washing and soaking sake rice produces rice washing wastewater and soaking water, but it is difficult to treat these wastewaters, so if the wastewater is small, it can be diluted with water. It is being discharged. However, this method not only requires a large amount of dilution water, but also fails to recover active ingredients such as starch contained in the wastewater.

When a large amount of wastewater is generated, it may be possible to treat it with activated sludge, but this method also has the disadvantage that the active ingredients in the wastewater cannot be recovered and the equipment is expensive.

Generally, about 30% of the raw material rice for sake brewing is contained in rice washing wastewater and soaking water.
It contains soluble starch, solid starch, and a small amount of rice protein, and a method for recovering these is desired.

In addition, in recent years, rice flour has been hydrolyzed to obtain ingredients for sake brewing, and in this case, the wastewater is sometimes used as brewing water in order to effectively utilize the starch in the wastewater. That is, the solid starch in rice flour and wastewater is liquefied with a liquefying enzyme, and the insoluble rice protein is separated from the same liquid to obtain Sake Brewery Kawahara To 1. However, solid starch in wastewater exists in a state of being included in agglomerates of protein particles, and as it is, it does not come into contact with the liquefaction enzyme and is not liquefied sufficiently, so the separation of protein and starch is incomplete. Therefore, effective use cannot be planned.

The present invention solves the above-mentioned problems and not only completely recovers the active ingredients in wastewater, but also effectively uses the wastewater as water for obtaining fermented liquor for sake brewing or raw material for starch syrup saccharification from rice flour, etc. It is something to be used.

Means for Solving the Problems In the present invention, in order to completely separate protein and starch, a liquid containing solids (liquefied enzyme is added to this liquid and protein and solid starch are dispersed in a fine particle state, and solid Starch is liquefied and solid-liquid separated from protein.In other words, the gist of the present invention is to liquefy starch and to separate fine powders of rice flour and/or white rice, waste rice, other rice, etc. The purpose is to disperse the starch in fine particles in the water in which the rice is soaked, liquefy the starch in the liquid with a liquefaction enzyme, and separate it into insoluble vegetable protein and soluble liquefied starch.

Note that "dispersing in the form of fine particles" as used in the claims of the present application means homogenizing in water.

Function According to the present invention, solid components such as solid starch and insoluble protein are thoroughly pulverized and dispersed by stirring or the like. Therefore, the solid starch particles that have been incorporated into the agglomerates of protein particles either adhere to the surface of the floating protein particles in a fine particle state, or
Alternatively, they will float in the liquid in the form of individual fine particles, resulting in good contact with the liquid. Then, all solid starches come into contact with liquefying enzymes and are liquefied to become soluble starch.

After the liquefaction is completed, the protein is converted into a cake and the starch is converted into a solution by solid-liquid separation from the mixture of protein particles and soluble starch.
Each can be obtained with less impurities.

Example An embodiment of the present invention will be described below with reference to process diagrams.

The track is a wastewater tank, which contains rice washing wastewater and/or soaking water, and filtrate conveyed from a filtrate tank (to be described later). These wastewaters etc. are heated to 55℃ using heater α3.
It is heated to 60°C and sent to a mixer (151).I is a raw material tank that contains rice flour and/or fine powder such as white rice, scrap rice, and other rice, and a certain amount of it is sent to a mixer 09. , dissolve and mix with the above-mentioned wastewater, etc. At the same time, add a liquefaction enzyme. When dissolving and mixing, adjust the solid content concentration of the mixed solution to approximately 25%, and the solid starch will be liquefied and the insoluble protein will be dissolved. Not only is the workability in solid-liquid separation etc. excellent, but the concentration of the alcoholic beverage obtained by the present invention is also suitable for sake brewing, and post-treatments such as evaporation concentration can be omitted.

In the mixed liquid of mixer 0!9, the solid content is not sufficiently dispersed, and the solid starch is incorporated into the lumps of protein particles. This liquid mixture is sent to the homomixer (19Q!) via tank QB and service tank αa, and is sufficiently stirred until the solid content becomes fine particles of protein and solid starch. The dispersed solid starch is liquefied into soluble starch by the action of a liquefaction enzyme, but in order to complete this liquefaction, the dispersion is heated to approximately 956C to 100'C using a heater, and then Keep it warm with a thermal decomposition machine.

Next, the protein fraction solution after liquefaction is sent to the tank@, and the pH
Add lactic acid until the value is 4.4-4.8. The purpose of this acidification treatment is to inactivate the enzyme and aggregate the dispersed protein particles to improve filterability.

The protein aggregate after acidification is sent to a filter press for low-pressure filtration. The filtrate obtained by this filtration (al
dissolves soluble starch with few impurities,
It is an excellent raw material for sake brewing and is stored in a filtrate tank. On the other hand, the cake (A) is sent to the mixer C1l+ through the cake hopper (2), where it is mixed with fresh water, and then sent to the dehydrator (to) through the service tank where it is separated into solid and liquid again. The cake CB obtained in this dehydrator is washed with water, dehydrated, and then dried in a drier to become a highly pure protein product. The filtrate Φ) obtained from the dehydrator (to) is conveyed along with the washing liquid through the filtrate tank ring to the wastewater tank αV by a pump (to), and is used as water for dissolving and mixing rice flour and the like together with the rice washing wastewater.

This filtrate (b) is weakly acidic due to the acidification treatment carried out in the tank (to), and the enzyme function may be hindered. In that case, after mixing with rice washing wastewater, etc., Just use the mixer QS to adjust the pH. The pH value after adjustment is preferably 6.4 to 6.6, which is the value at which the liquefying enzyme exhibits the highest activity, and the pH adjusting (neutralizing) agent to be used is sodium carbonate or water-barrel≠' Thorium etc. is preferable.

Effects of the Invention The present invention completely liquefies the solid starch by dispersing the solid content of rice flour, rice washing waste water, etc. into fine particles, and easily and completely separates the protein from the starch. Therefore, it is possible to extract high-purity rice protein from rice flour, etc. and rice washing waste water and soaking water, etc., which have not been fully utilized in the past, and to obtain a raw material for sake brewing consisting of soluble starch with few impurities, thereby conserving rice resources. Use without waste.

The high-purity rice protein obtained by the present invention is particularly excellent among vegetable proteins, has high nutritional value, and has high utility value as a food.

The cost required for wastewater treatment by the method of the present invention is low;
Moreover, since high-value products and raw materials can be obtained using the method of the present invention, it is also possible to obtain benefits from wastewater treatment.

[Brief explanation of the drawing]

The figure is a process diagram showing one embodiment of the present invention.

Claims (1)

[Claims] 1. Disperse rice flour and/or fine powder of white rice, waste rice, other rice, etc. in the form of fine particles in rice washing waste water of sake brewing rice and/or soaking water of sake brewing rice, and liquefy the starch in the liquid with an enzyme. A method for treating rice washing wastewater, etc., which consists of liquefying it and separating it into insoluble vegetable protein and soluble liquefied starch.