JP2005238077A - Pooling method of organic residue and pooling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pooling method of an organic residue that prevents the putrefaction of an organic residue and does not inhibit the recycling of the organic residue. <P>SOLUTION: The method comprises pooling the organic residue under deoxidation atmosphere. More specifically, the organic residue such as used tea leaves 5 are pooled under deoxidation atmosphere by immersing in carbonated water 2 of an deoxidizing treatment liquid. The used tea leaves are thrown into an adjustment tank 20 from a residue supply means 10 and mixed with the carbonated water 2 supplied from a liquid supply means 52 and sent to a reservoir 30 for pooling. The carbonated water 2 may be added to the used tea leaves 5 at the adjustment tank 20 equipped with a cutter pump 71 as a crushing means before the leaves 5 are pooled at the reservoir 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an organic residue storage method, and more particularly to a plant organic residue storage method and storage apparatus for storing a solid plant organic residue such as teacup and coffee cake without rot.

  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, solid organic residues are likely to rot during storage due to their high water content. Rotated organic residue is difficult to be reused, and generates a foul odor to deteriorate the hygienic condition of the surrounding environment.

  Therefore, as a method for preventing the decay of organic residue, a method of adding an aqueous potassium sorbate solution and an acid aqueous solution to the organic residue has been proposed (Patent Document 1). In the method disclosed in Patent Document 1, an aqueous potassium sorbate solution is added to and mixed with an organic residue such as potato waste and beer lees using a mixer, and then an aqueous solution of an acid such as phosphoric acid is added and mixed.

  By adding an aqueous potassium sorbate solution to the organic residue, it is possible to suppress the growth of microorganisms, particularly fungi (fungi), and according to the above method, the organic residue is stored for 2 to 3 weeks without being spoiled. Can do. Moreover, the activity of potassium sorbate can be improved and the addition amount of potassium sorbate can be reduced by adding the aqueous solution of acid after the addition and mixing of the potassium sorbate aqueous solution.

However, it is difficult to remove chemicals such as potassium sorbate and phosphoric acid from the organic residue treated by the above method. For this reason, when the organic residue in which the above-mentioned additive chemicals remain is reused, these additive chemicals inhibit the processing at the time of reuse, and these additive chemicals are mixed in the product obtained after the reuse treatment. There is a fear.
JP-A-8-173058

  The present invention has been made in view of the problems as described above, and the object thereof is an organic residue that can prevent the decay of an organic residue while reducing the possibility that a substance that inhibits the reuse of the organic residue remains. It is to provide a storage method. More specifically, the present invention uses a substance that is easy to remove from the organic residue and has a low risk of inhibiting the reuse of the organic residue after storage, and prevents the organic residue from being spoiled and stored. It aims at providing the storage method of the organic substance residue made possible.

  The present invention stores an organic residue in a deoxygenated atmosphere, particularly in a state of being immersed in a deoxygenated liquid that has been deoxygenated to remove dissolved oxygen contained in raw water. More specifically, the present invention provides the following.

  (1) A method for storing an organic residue in which the organic residue is stored 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-derived plant-based processing residues are rich in catechins and other available substances, and meat extracts that are rich in protein It can be stored longer than animal residues such as extraction residues. Furthermore, in food processing factories, beverage manufacturing factories, and the like, there is a tendency that a certain amount of plant-based processing residue of approximate quality is regularly generated. For this reason, the plant-based processing residue is easy to reuse such as recovering the remaining components, and is a suitable storage target in the present invention. Among them, the tea bowl generated in the beverage production process is particularly preferable because it contains a large amount of catechins and can be reused by collecting the catechins and mixing them with feed after storage according to the present invention.

  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. As a method of deoxygenating a gas containing oxygen, a method of removing oxygen by blowing an inert gas or the like, or a method of deoxygenating by containing a gas in a sealed space and putting a deoxidizer in this space and so on.

  In the present invention, the contact between the organic residue and oxygen is blocked by placing the organic residue in a deoxygenated atmosphere. The solid organic residue is in a state in which aerobic microorganisms are difficult to grow due to inhibition of contact with oxygen. For this reason, according to the present invention, it is possible to prevent and store the organic matter residue. In addition, according to the present invention, since there is no need to add chemicals such as a preservative for preventing corruption to the organic residue, inconvenience caused by the preservative remaining in the organic residue when the organic residue is reused. Can be reduced.

  (2) The organic residue storing method according to (1), wherein the organic residue is immersed in a deoxygenated treatment solution that has been subjected to deoxidation treatment in the deoxygenated atmosphere.

“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.

  The deoxidation treatment liquid has a pH of 5.5 or less, preferably 3.5 to 4.5. Acidic or weakly acidic deoxygenated liquids have a particularly high fungus growth inhibitory effect among microorganisms and are suitable for preserving 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.

  (3) The method for storing organic matter residues according to (2), wherein the deoxygenation treatment liquid is an inert gas-dissolved water obtained by dissolving an inert gas to perform a deoxygenation treatment.

  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.

  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, the “inert gas” means a gas that hardly causes an oxidation reaction among chemical reactions, and includes a rare gas group element gas such as helium and argon, nitrogen gas, and carbon dioxide gas. To do.

  Of these inert gases, carbon dioxide gas and nitrogen gas are easy to handle and can be used particularly preferably. An inert gas having a concentration of 99.9% or more is used, and the amount blown so that the oxygen concentration of the liquid after blowing the inert gas is 1 mg / L or less, preferably 0.1 mg / L or less. It is preferable to adjust the blowing time and the like.

  (4) The method for storing organic matter residues according to (3), wherein the inert gas is carbon dioxide, and the inert gas-dissolved water is carbonated water.

  As the deoxygenation treatment solution for immersing the organic residue, it is preferable to use carbonated water obtained by deoxygenation treatment in which carbon dioxide gas is blown into the raw water. 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.

  (5) An organic matter comprising: a residue supply means for supplying an organic residue, a liquid supply means for supplying a deoxygenated deoxidized liquid, and a storage tank for immersing and storing the organic residue in the deoxygenated liquid. Residue storage device.

  The organic residue storage device according to the invention described in (5) includes a storage tank into which an organic residue is charged, and can be configured by connecting a residue supply means and a liquid supply means to the storage tank. In addition to the storage tank for storing the organic substance residue by immersing it in the deoxygenation treatment liquid, a pretreatment adjustment tank for mixing the organic residue and the deoxygenation treatment liquid is provided, and the residue supply means is configured in this adjustment tank. The residue supply pipe and the liquid supply pipe constituting the liquid supply means may be connected.

  The storage tank for storing the organic residue can be used without particular limitation as long as the organic residue can be stored by immersing the organic residue in a deoxygenated liquid. However, in order to prevent the oxygen from being dissolved in the deoxygenation treatment liquid, it is preferable that the oxygen-dissolving solution has a shape that can be sealed and is made of a material that hardly transmits oxygen.

  According to the invention described in (5), the same effect as that of the invention described in (1) can be obtained.

  (6) The organic residue storage device according to (5), wherein the deoxygenation treatment liquid is an inert gas-dissolved water in which an inert gas is dissolved and deoxygenated.

  According to the invention described in (6), the same effect as in the invention described in (3) can be obtained.

  (7) The organic residue storage device according to (5) or (6), further comprising a gas supply means for supplying an inert gas.

  According to the invention described in (7), the same effect as that of the invention described in (4) can be obtained.

  Moreover, this invention includes the storage process which applied the storage method in any one of said (1)-(4) using the processing apparatus of the organic substance residue containing the storage apparatus as described in said (5)-(7). By carrying out the organic residue treatment method, the recovery rate of available components contained in the organic residue can be improved.

  According to the present invention, by storing the organic substance residue in a deoxygenated treatment solution by immersing the organic substance residue in a deoxygenated treatment solution, the oxygen is blocked, and microorganisms, particularly mold, grow in the organic substance residue during storage. To prevent. 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.

  Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic view of an organic residue processing storage apparatus 1 (hereinafter referred to as “storage apparatus 1”) including an organic residue storage tank 30 according to the present invention. Hereinafter, a case where tea bowl is used as an organic residue and carbonated water is used as a deoxygenation treatment liquid will be described.

  First, the overall configuration of the storage device 1 will be described with reference to FIG. The storage device 1 shown in FIG. 1 is charged with a teacup 5 and added with carbonated water 2, and then crushes the slurry into a slurry, and the teacup 5 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 extraction pipe 70 a is connected to the inlet side of the cutter pump 71, one end of the return pipe 70 b is connected to the outlet side of the cutter pump 71, and the other end of the return pipe 70 b is connected to the adjustment tank 20, Constitute.

  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.

  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 method of storing the tea bowl 5 as an organic residue in the deoxygenated atmosphere of immersing in the carbonated water 2 as the deoxygenation treatment liquid using the above-described storage device 1 will be described.

  First, 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 teacup 5 is finely crushed in a deoxygenated atmosphere immersed in the carbonated water 2, and a slurry containing the crushed teacup is obtained.

  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. The carbonated water adjustment tank 40 and the carbonated water supply pipe 52 are provided with an acid addition means (not shown) for adding acid as necessary, and the pH of the liquid substance stored in the storage tank 30 is 5.5 or less. It may be made to become. The amount of acid added can be adjusted using a pH meter 75 or the like.

  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 addition, before the process is restarted, a cleaning liquid such as water may be supplied from the cleaning liquid pipe 90 to clean the inside of the adjustment tank 20. When the adjustment tank 20 is washed, the washing drainage is discharged through the drainage pipe 91 connected to the drawing pipe 70a. By washing the adjustment tank 20, different types of organic residue can be treated.

  In the storage tank 30, the teacup 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. That is, in this embodiment, since the carbonated water 2 is added and mixed to the teacup 5 in the adjustment tank 20, the teacup 5 fed into the storage tank 30 is deoxidized atmosphere immersed in the carbonated water 2. Will be stored below. In this 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 surely stored in a deoxygenated atmosphere.

  The inside of the storage tank 30 is preferably sealed in order to prevent oxygen from dissolving from the liquid surface. Furthermore, it is preferable to fill the sealed storage tank 30 with an inert gas such as carbon dioxide. In the present embodiment, carbon dioxide gas is supplied to the upper portion of the storage tank 30 from the gas branch pipe 53 b branched from the gas supply pipe 53.

  In addition, it is preferable to fill the inside of the adjustment tank 20 with an inert gas such as carbon dioxide gas. By filling the inside of the adjustment tank 20 with an inert gas, the inside of the adjustment tank 20 becomes a deoxygenated atmosphere, so that oxygen can be prevented from being dissolved into the slurry from the liquid surface. Moreover, the sealing state of the adjustment tank 20 may be incomplete. 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 storage tank 30 and the adjustment tank 20 is preferably a gas having a specific gravity heavier than air and difficult to cause a chemical reaction, such as carbon dioxide gas or nitrogen gas. The concentration of the inert gas is preferably 99.9% or more.

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

[Example 1]
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. The carbonated water was obtained by blowing 100 ml of 99.99% carbon dioxide gas into 50 ml of city water having an oxygen concentration of 8 mg / L for 30 seconds.

[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 1]
The same treatment as in Example 1 was performed using city water (oxygen concentration: 8 mg / L) that was not subjected to deoxygenation instead 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]
The experiment was performed under the same conditions as in 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 Example 1, no mold or rot odor occurred even after 7 days. In Example 2, mold occurred 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.

  On the other hand, for Comparative Example, generation of mold was observed after 3 days in Comparative Example 1 and after 5 days in Comparative Example 2, and in Example 1 after 5 days, and in Example 2 after 7 days, rot odor was also observed. Occurred.

  The present invention stores organic residues such as teacups without decaying for a certain period, and when a certain amount of organic residues are stored, collects and reuses substances such as catechins from these stored organic residues. Available to do.

It is a mimetic diagram showing the storage device which is one embodiment of the present invention.

Explanation of symbols

1 Organic residue treatment storage device (storage 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)

Claims (7)

  An organic residue storage method for storing an organic residue in a deoxygenated atmosphere.   The organic residue storage method according to claim 1, wherein the organic residue is immersed in a deoxygenation treatment liquid that has been subjected to deoxygenation treatment in the deoxygenation atmosphere.   The method for storing an organic substance residue according to claim 2, wherein the deoxygenation treatment liquid is an inert gas-dissolved water in which an inert gas is dissolved to perform deoxygenation treatment. The inert gas is carbon dioxide,
The organic residue storage method according to claim 3, wherein the inert gas-dissolved water is carbonated water. A residue supplying means for supplying an organic residue;
A liquid supply means for supplying a deoxygenated liquid after deoxygenation;
An organic matter residue storage apparatus comprising: a storage tank that immerses and stores an organic matter residue in a deoxygenated liquid.   The organic-residue storage device according to claim 5, wherein the deoxygenation treatment liquid is an inert gas-dissolved water in which an inert gas is dissolved to perform deoxygenation treatment.   The organic residue storage device according to claim 5 or 6, further comprising a gas supply means for supplying an inert gas.

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