JP2005238076A - Treating method of organic residual dross - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic residual dross treating method in which organic residual dross is prevented from decaying and possibility of inhibiting reuse of organic debris is reduced to allow storage of the organic residual dross. <P>SOLUTION: The organic residual dross is crushed in a deoxidizing atmosphere. Actually, the organic residual dross such as tea sludge 5 is crushed in an adjusting tank 20 equipped with a crushing means composed of a cutter pump 71 or the like. Crushing is performed in deoxidizing atmosphere. For example, the tea sludge 5 is dipped into carbonic acid water 2 serving as a deoxidizing treating liquid, thereby the tea sludge 5 is crushed in the deoxidizing atmosphere. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for treating organic residue, and more particularly, to a method for treating a plant organic residue that can be stored for a certain period of time without decaying solid plant organic residues such as teacups and coffee lees.

  Conventionally, solid organic residue generated in food factories, restaurants, supermarkets, and the like has been incinerated as waste. However, in recent years, since reduction of the amount of waste has been demanded, it has been required to reuse organic residue, and various methods for reusing organic residue have been proposed. . As a method for reusing an organic residue, a method of carbonizing the organic residue to form a solid fuel, a method of decomposing the organic residue with microorganisms to make fertilizer (compost), and the like are known.

  By the way, although organic residue is generated from many sources such as food factories, restaurants or supermarkets, the amount of organic residue generated at each source is not large. For this reason, organic residue is stored at each source until a certain amount is accumulated. However, the solid organic residue has a high water content and a large amount of air enters the micro space, so that microorganisms, particularly mold, are likely to propagate during storage. The organic matter residue that the microorganisms have propagated and further rotted is difficult to be reused, and generates a foul odor and deteriorates the sanitary condition of the surrounding environment.

  Therefore, a processing method has been proposed that enables the storage of a certain period of time by preventing the generation of odors from the organic residue by adding a solvent that dissolves fats and oils to the solid organic residue and slurrying the organic residue. (Patent Document 1). In the method disclosed in Patent Document 1, a solid organic residue is crushed and dehydrated so as to have a certain particle size, and then a solvent such as limonene is added to dissolve fats and oils and proteins to remove the organic residue. Slurry. The slurried organic residue is not easily spoiled due to the antiseptic action of limonene and has fluidity, so that it is easy to handle, and can be stored and collected.

However, in the method described in Patent Document 1, a solvent such as limonene is used for the purpose of making an organic residue into a slurry, resulting in an increase in processing cost. Further, in order to add and mix the solvent in an appropriate amount to the organic residue, the organic residue needs to be crushed and dehydrated, which complicates the treatment process.
JP 2002-224638 A

  This invention is made | formed in view of the above subjects, The objective is to provide the processing method of the organic substance residue which prevents the decay of an organic substance residue and does not inhibit the reuse of an organic substance residue. . More specifically, the present invention uses an organic residue that is easy to remove from the organic residue and does not inhibit the reuse of the organic residue after storage, and allows the organic residue to be stored without being spoiled. It aims at providing the processing method of.

  In the present invention, organic residue is crushed under a deoxygenated atmosphere. More specifically, the present invention provides the following.

  (1) A method for treating an organic residue including a crushing step of crushing the organic residue in a deoxygenated atmosphere.

  Here, the “organic residue” in the present specification refers to an organic substance that is a plant, animal, or microorganism-derived waste and contains an organism-containing component that can be used industrially. Specifically, food processing residues such as tea cakes, bean cakes, and brewed rice cakes generated in the food processing process, food residues such as raw garbage, and organic sludge can be mentioned.

  Among the above organic residue, food processing residues such as teacups and bean cakes, plant-based processing residues contain plant polyphenols, and these substances are used by crushing treatment. To prevent corruption. In particular, the tea bowl generated in the beverage production process contains a large amount of catechins, and therefore, it can be reused for various purposes after being stored according to the present invention to prevent spoilage. It is a processing target.

  The “deoxygenated atmosphere” means an environment that has been deoxygenated to such an extent that aerobic microorganisms cannot grow, and is not limited to a completely oxygen-free state. Specifically, the oxygen concentration is 1 mg / L (1 ppm) or less, preferably 0.1 mg / L (0.1 ppm) or less by deoxidizing a gas or liquid containing oxygen. Means. Examples of the method for crushing the organic residue in a deoxygenated atmosphere include a method for crushing the organic residue in a deoxygenated gas or a deoxygenated liquid.

  In the present invention, the organic residue is crushed in a deoxygenated atmosphere to remove oxygen retained on or inside the organic residue. The solid organic residue is in a state in which aerobic microorganisms hardly grow by removing oxygen. For this reason, according to the present invention, it becomes possible to prevent and store the organic residue.

  Further, according to the present invention, it is not necessary to add chemicals such as a preservative for preventing corruption when storing the organic residue, so that when the organic residue is reused, the preservative remains in the organic residue. Inconvenience caused by this can be reduced. Furthermore, according to the present invention, the organic residue can be easily extracted into soluble components such as plant polyphenols, and can be modified to a state excellent in handling properties.

  (2) The method for treating an organic residue according to (1), wherein the deoxygenating atmosphere is configured by filling an inert gas in a sealable space.

  The organic residue can be crushed in a sealed space filled with a deoxygenated gas. The oxygen concentration of the deoxygenated gas is preferably 1 mg / L or less. As a method for obtaining a deoxygenated gas, a method of removing oxygen by blowing an inert gas or the like into a gas containing oxygen, and a gas containing oxygen in an enclosed space, and a deoxidizer in the space There is a method to deoxygenate by putting in.

  Among these methods, a method of creating a deoxygenated atmosphere by filling with an inert gas is particularly preferable because it is easy to control deoxygenation conditions. As the inert gas that fills the sealed space, it is preferable to use an inert gas that is easier to handle than the reducing gas.

  Here, “inert gas” means a gas that suppresses the oxidative decomposition reaction of organic substances, and specifically means a reducing gas such as hydrogen gas or carbon monoxide gas, and an inert gas. To do. In the present specification, “inert gas” means a gas that hardly causes an oxidation reaction among chemical reactions, and is not limited to a rare gas group element such as helium or argon, but includes nitrogen gas and carbon dioxide gas. Of these inert gases, carbon dioxide gas and nitrogen gas are easy to handle and can be used particularly preferably. It is preferable to use an inert gas having a concentration of 99.9% or more.

  (3) The organic residue processing method according to (1), wherein in the crushing step, the organic residue is immersed and crushed in a deoxygenated treatment solution that has been subjected to deoxygenation treatment.

  The organic substance residue may be crushed in a state where it is immersed in a liquid subjected to deoxygenation treatment (deoxygenation liquid). When the organic residue is crushed by immersing it in a deoxygenation treatment solution, the space for pulverizing the organic residue need not be in a deoxygenated atmosphere, and a gas containing oxygen may exist in this space. However, it is preferable to put the organic substance residue and the deoxygenated treatment liquid into a sealed space and to put this space in a deoxygenated atmosphere because it is possible to prevent oxygen from being dissolved from the liquid surface.

Here, the “deoxygenated liquid” means a liquid obtained by deoxygenating raw water containing oxygen. The dissolved oxygen concentration in the deoxygenation treatment solution is preferably 1 mg / L or less, more preferably 0.1 mg / L or less. City water, industrial water, or the like can be used as raw water for the deoxygenated liquid. In addition, as the deoxygenation treatment, an inert gas blowing treatment into the raw water, a degassing membrane treatment in which the raw water is brought into contact with the degassing membrane, and a chemical addition such as sodium hydrogen sulfate (NaHSO ₃ ) are added. Processing. When adjusting the deoxygenated treatment liquid by blowing an inert gas, the blow amount and blow time are adjusted so that the oxygen concentration of the blown liquid is 1 mg / L or less, preferably 0.1 mg / L or less. It is preferable.

  The deoxidation treatment liquid has a pH of 5.5 or less, preferably 3.5 to 4.5. Acidic or weakly acidic side deoxygenation treatment liquid has a particularly high fungus growth inhibitory effect among microorganisms and is suitable for preservation of tea polyphenols. In order to make the deoxygenated liquid acidic, an organic acid such as hydrochloric acid, sulfuric acid, and acetic acid can be added to the deoxygenated liquid as necessary.

  As the deoxidation treatment liquid, it is preferable to use an inert gas-dissolved water in which an inert gas is blown into the raw water and dissolved oxygen in the raw water is replaced with the inert gas. The inert gas can be easily removed from the liquid by performing an aeration process. For this reason, after storing the organic substance residue immersed in the inert gas-dissolved water, it is possible to easily remove the inert gas from the organic substance residue by performing an aeration process in which oxygen gas or air is blown for reuse. Can be removed.

  In particular, it is preferable to use carbonated water obtained by blowing carbon dioxide into raw water for deoxidation treatment as the deoxygenation treatment liquid. Since carbonated water has a pH of 4 to 6, it has a high effect of suppressing the growth of microorganisms, particularly fungi (molds), and when storing organic residues containing catechins, decomposition of catechins contained in organic residues is prevented. Can be prevented.

  According to the present invention, the organic residue can be prevented from growing in the organic residue by crushing the organic residue in a deoxygenated atmosphere. For this reason, alterations such as decay of organic residue can be prevented, and decomposition of catechins and the like can be suppressed and stored. Further, according to the present invention, an additive substance such as an inert gas is easily removed from the organic residue after storage, and the organic residue from which the additive substance has been removed is processed or reused by various methods. can do. Furthermore, the present invention can make the organic residue easily reusable.

  Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic view of an organic residue treatment storage device 1 (hereinafter referred to as “treatment device”) including an adjustment tank 20 provided with a crushing means for crushing an organic residue according to the present invention. Hereinafter, a case where a teacup is immersed as an organic residue in carbonated water, which is a deoxygenation treatment liquid, under a deoxygenated atmosphere will be described.

  First, the overall configuration of the processing apparatus 1 will be described with reference to FIG. The processing apparatus 1 of FIG. 1 introduces a teacup 5 and, after adding carbonated water 2, crushes the slurry into a slurry, and a teacup 5 that is slurried in the adjustment tank 20. Is stored in the carbonated water 2.

  The adjustment tank 20 adjusts the content of the belt conveyor 10 constituting the residue supply means, the carbonated water supply pipe 52 constituting the liquid supply means, the gas supply pipe 53 constituting the gas supply means, and the adjustment tank 20. An extraction pipe 70 a that is discharged from the tank 20 and fed to the storage tank 30 is connected. The adjustment tank 20 includes a circulation path 70 constituted by a drawing pipe 70a and a return pipe 70b. The circulation path 70 is provided with a cutter pump 71 which is a crushing means, and the circulation path 70 and the cutter pump 71 constitute a circulation crushing means.

  In addition, arbitrary structures can be employ | adopted as a crushing means, for example, you may provide the stirrer provided with the cutter blade in the adjustment tank 20. FIG.

  In the middle of the return pipe 70 b, one end of the slurry feed pipe 80 is connected, and the other end of the slurry feed pipe 80 is connected to the storage tank 30. In addition to the slurry feed pipe 80, a gas branch pipe 53 b branched from the gas supply pipe 53 and a discharge pipe 92 that discharges the contents of the storage tank 30 are connected to the storage tank 30.

  Next, the configuration of the adjustment tank 20 will be described in detail. The adjustment tank 20 is a sealed container having a side wall 20b, a lid wall 20a, and a bottom wall 20c, and is installed so that the lid wall 20a is an upper surface. An opening 25 is provided in a part of the lid wall 20 a, and the insertion portion 21 is provided in the opening 25 so as to protrude above the adjustment tank 20.

  The input unit 21 has an input port 21a into which the teacup 5 is input, and the belt conveyor 10 is connected to the input port 21a. Although the inlet 21a is opened and air enters and exits, the adjusting tank 20 is provided with a dropping plate 22 that covers the opening 25, and the opening 25 is covered with the dropping plate 22 so that the adjusting tank 20 can be sealed. It is configured. The dropping plate 22 is supported by a spring 23 and moves up and down. Note that when the carbon dioxide gas is always supplied from the gas supply pipe 53 to the adjustment tank 20 as in the present embodiment, the sealing by the dropping plate 22 may not be strict.

  A cleaning liquid pipe 90 for supplying a cleaning liquid for cleaning is connected to the adjustment tank 20 as necessary, and a first liquid level gauge 26 for measuring the liquid level in the adjustment tank 20 is provided. In the circulation path 70 connected to the adjustment tank 20, a pH meter 75, an electrical conductivity meter 76, a pre-cutter 77, a first flow meter 79, a first flow rate adjustment valve 78, and the like can be provided as necessary. . Similarly, the carbonated water supply pipe 52, the cleaning liquid pipe 90, and the like may be provided with a second flow rate adjusting valve 55 and the like as necessary.

  On the other hand, the storage tank 30 is configured by a sealable container such as a metal tank, and the slurry-like teacup 5 sent from the adjustment tank 20 through the extraction pipe 70a, the return pipe 70b, and the slurry feed pipe 80 is stored. Store in a state immersed in carbonated water 2. Similar to the adjustment tank 20, the storage tank 30 can be provided with a second liquid level gauge 86 for measuring the liquid level of the liquid inside as necessary.

  Next, a processing method for crushing the teacup 5 as an organic residue in a deoxygenated atmosphere using the processing apparatus 1 will be described.

  The tea bowl 5 is put into the adjustment tank 20 by the belt conveyor 10. The teacup 5 thrown into the adjustment tank 20 is deposited on the dropping plate 22, and when the amount of accumulation reaches a certain amount or more, the falling plate 22 moves below the adjustment tank 20 by the weight of the teacup 5, and the opening 25 is opened. The bowl 5 on the falling plate 22 falls. After the tea bowl 5 falls, the dropping plate 22 covers the opening 25 by the restoring force of the spring 23.

  The drop plate 22 is provided with a sensor 24 that senses opening and closing of the drop plate 22. When it is detected by the sensor 24 that the tea bowl 5 has been dropped into the adjustment tank 20, the second flow rate adjustment valve 55 provided in the carbonated water supply pipe 52 is activated, and the carbonated water 2 is adjusted to the adjustment tank. 20 and the cutter pump 71 is operated. Thereby, the crushing process in which the teacup 5 is finely crushed in a deoxygenated atmosphere immersed in the carbonated water 2 is performed, and a slurry containing the crushed teacup is obtained.

  The tea bowl 5 is preferably crushed for 5 to 20 minutes in a deoxygenated atmosphere using a cutter pump 71 or other crushing means, and the particle size is preferably about 0.4 to 200 μm. When the crushing time is short, the teacup 5 is not sufficiently crushed and oxygen is not sufficiently removed. On the other hand, if the crushing time is longer than necessary, the power for crushing is wasted. The crushing is preferably performed while monitoring that the deoxygenated atmosphere is maintained using an electric conductivity meter 76 or the like.

  As in this embodiment, the tea bowl is preferably crushed in a state of being immersed in carbonated water 2 that is a deoxygenation treatment liquid. This is because, by immersing the teacup 5 in the liquid, the teacup 5 expands and is easily crushed. The supply amount of the carbonated water 2 is preferably 50 to 100% by weight with respect to the teacup 5. The carbonated water 2 is adjusted in a carbonated water adjustment tank 40 by blowing carbon dioxide into raw water such as industrial water.

  Here, the carbonated water adjustment tank 40 includes a raw water supply pipe 41 to which raw water is supplied and a dissolved gas supply pipe 42 to which carbon dioxide gas is supplied. In the carbonated water adjustment tank 40, carbonated water 2 is obtained by dissolving carbon dioxide gas in the raw water supplied from the raw water supply pipe 41 using an air diffuser, an ejector, a dissolution pump, or the like. If necessary, the carbonated water adjustment tank 40 and the carbonated water supply pipe 52 are provided with an acid addition means (not shown) for adding an acid so that the teacup 5 is crushed at a pH of 5.5 or less. Also good. The amount of acid added can be adjusted using a pH meter 75 or the like.

  In this embodiment, the teacup 5 is treated in a deoxygenated atmosphere by being immersed in the carbonated water 2. However, in order to prevent oxygen from entering from the liquid surface, the space for the crushing treatment is also deoxygenated. An atmosphere is preferable. In the present embodiment, carbon dioxide gas is supplied from the gas supply pipe 53 to the adjustment tank 20.

  The inert gas filled in the adjustment tank 20 is preferably a gas having a specific gravity heavier than air and hardly causing a chemical reaction, such as carbon dioxide gas or nitrogen gas. The concentration of the inert gas is preferably 99.9% or more.

  The adjustment tank 20 is provided with a first liquid level gauge 26 to measure the liquid level in the adjustment tank 20 and supply tea bowl 5 and carbonated water 2 until the slurry in the adjustment tank 20 reaches a predetermined amount. Then, the mixture of tea bowl 5 and carbonated water 2 is circulated and crushed into a slurry. By adding the carbonated water 2 and crushing the teacup 5, it is possible to homogenize the particle size of the teacup 5 and remove oxygen retained in the teacup 5.

  When the slurry in the adjustment tank 20 reaches a predetermined amount, the storage valve 85 provided in the slurry feed pipe 80 is opened. Thereby, the slurry in the adjustment tank 20 is supplied from the adjustment tank 20 to the storage tank 30 via the extraction pipe 70a, the return pipe 70b, and the slurry feed pipe 80. Subsequently, the tea bowl 5 and carbonated water 2 are introduced into the adjustment tank 20 from which the slurry has been pulled out, and the above-described processing is continued.

  In the storage tank 30, the tea bowl 5 supplied from the belt conveyor 10 through the adjustment tank 20 is stored. The teacup 5 is stored in a state of being immersed in the carbonated water 2 supplied from the carbonated water supply pipe 52 through the adjustment tank 20. In the present embodiment, the crushing process in the adjustment tank 20 removes oxygen retained on the surface and inside of the teacup 5, so that the teacup 5 is stored in a deoxygenated atmosphere.

  When storing the teacup 2, it is preferable to store it in a deoxygenated atmosphere as described above in order to prevent quality changes such as decay. That is, the crushed teacup 2 is preferably stored in a deoxygenated gas or liquid. For example, in this embodiment, the crushed teacup 2 is stored in a deoxygenated atmosphere immersed in carbonated water. Furthermore, in this embodiment, carbon dioxide gas is supplied to the upper part of the storage tank 30 from the gas branch pipe 53b branched from the gas supply pipe 53, and the inside of the storage tank 30 is also made into a deoxygenated atmosphere.

  The storage tank 30 is provided with a second liquid level gauge 86 for measuring the liquid level in the storage tank 30. When the stored liquid in the storage tank 30 reaches a predetermined amount, the storage tank 30 is provided with Drain the stored liquid. The discharged stored liquid is collected using a tank lorry or the like. The collected stored liquid is prevented from being spoiled, and the decomposition of polyphenols and the like is suppressed, and furthermore, carbon dioxide can be easily removed by aeration treatment or the like. For this reason, the storage liquid after collection | recovery can be utilized for refinement | purification of polyphenols, manufacture of powdered tea, etc.

  The valve opening / closing and flow rate control described above can be performed by the controller 50. In addition, the processing apparatus 1 is provided with one or two or more preliminary storage tanks (not shown), and a flow path switching valve is provided in the slurry feed pipe 80 to store the teacup 5 in the preliminary storage tank. Also good.

[Example]
50 g of teacup (moisture content of 85% by weight) generated in the process of manufacturing green tea beverages using sencha as a raw material is put in a mixer, and 50 ml of carbonated water (carbonic acid concentration 0.01 vol%, pH 4.0) is added to the teacup. Was crushed to obtain a slurry. The slurry had an oxygen concentration of less than 0.1 mg / L and a pH of 4.5. This slurry was placed in a closed glass container. Next, 50 ml of carbon dioxide gas having a concentration of 99.99% was blown into the sealed container, and the lid was covered and left in a sterile box at 35 ° C.

  About 1 cm from the surface of the slurry in the container was covered with a greenish brown suspension, and the crushed teacup was in a state of being immersed in the liquid. Carbonated water was obtained by blowing 100 ml of 99.99% carbon dioxide into 50 ml of city water having an oxygen concentration of 8 mg / L for 30 seconds.

[Comparative Example 1]
The same treatment as in Example 1 was performed using city water (oxygen concentration oxygen concentration 8 mg / L) which was not deoxygenated in place of carbonated water. The obtained slurry was put in a polyethylene container and left in a sterile box as in Example 1. In addition, the container was not covered and was allowed to vent.

[Comparative Example 2]
50 g of tea bowl used in Example 1 was put into the container used in Example 1 without crushing, and 50 ml of carbonated water was added. The container was blown with 50 ml of carbon dioxide gas having a concentration of 99.99%, covered, and left in a sterile box as in Example 1.

[Comparative Example 3]
The experiment was performed under the same conditions as in Comparative Example 2 except that the city water used in Comparative Example 1 was used instead of carbonated water. The container was left in a sterile box without a lid.

  Table 1 shows the presence or absence of mold on the surface of the stored liquid in the container after 3 to 7 days and the presence or absence of rot odor.

  As shown in Table 1, in the examples, no mold or rot odor occurred even after 7 days. About the comparative example, generation | occurrence | production of mold | fungi was recognized after the lapse of 3 days in the comparative example 1, the lapse of 7 days in the comparative example 2, and the lapse of 5 days in the comparative example 3, and the comparative example 1 after 3 days and the comparison after 7 days. In Example 3, a rotting odor was also generated.

  Since Comparative Example 2 was stored in a deoxygenated atmosphere, a certain microbial growth inhibitory effect was obtained, but generation of mold was observed after 7 days. This is considered to be due to the fact that oxygen was retained in the teacup due to the fact that the teacup was not crushed, and that mold grew in this portion.

  INDUSTRIAL APPLICABILITY The present invention can be used to adjust the raw materials for producing catechins, etc., in a form in which organic residue such as tea bowl is not easily spoiled and is easy to handle and easy to reuse.

It is a schematic diagram which shows the processing apparatus which is one Embodiment of this invention.

Explanation of symbols

1 Organic residue treatment storage device (treatment device)
10 Belt conveyor (residue supply means)
20 Adjustment tank 30 Storage tank 52 Carbonated water supply pipe (liquid supply means)
53 Gas supply pipe (gas supply means)
71 Cutter pump (crushing means)

Claims (3)

  A method for treating an organic residue comprising a crushing step of crushing the organic residue in a deoxygenated atmosphere.   The method for treating an organic matter residue according to claim 1, wherein the deoxygenating atmosphere is configured by filling an inert gas in a sealable space.   The processing method of the organic substance residue of Claim 1 which immerses and crushes an organic substance residue in the deoxidation process liquid which deoxidized in the said crushing process.

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