JP6650780B2 - Cleaning system - Google Patents

Description

  The present invention relates to a cleaning system.

  In a beverage factory, a plurality of varieties may be manufactured on the same production line, and when switching the beverage varieties, the inside of the pipe is washed. However, even with this washing, the fragrance component in the beverage that has permeated into the rubber packing or the like in the production line is not effectively removed, and a long-time hot-water washing may be performed as a deodorizing treatment. This hot water flow cleaning is often performed by circulating hot water in the piping from the viewpoint of energy saving.

  In this hot water flow washing, the scent component that has permeated the rubber packing and the like is eluted into the warm water. Since the warm water is circulated as described above, if the warm water is circulated as it is, the eluted scent component may adhere to the rubber packing or the like. Therefore, from the viewpoint of preventing re-adhesion, it is preferable that the scent component eluted in the warm water is removed before returning to the pipe and circulating.

  As a technique for reusing hot water after removing organic substances, a technique described in Patent Document 1 is known. Patent Document 1 discloses a process of adjusting the pH of water to be treated to 7 to 10, a process of adjusting the temperature of water to be treated to 35 ° C. or higher, and adding hydrogen peroxide and ozone to heated water to be treated. A process for oxidatively decomposing organic substances contained in the water to be treated and a method for decomposing and removing hydrogen peroxide and ozone remaining in the water subjected to oxidative decomposition of the organic substances are described. .

Japanese Patent Application Laid-Open No. 2001-170663 (see especially claim 1 and FIG. 1)

  Since the amount of the scent component (organic substance) that has permeated the rubber packing or the like is constant, the amount of the scent component eluted from the rubber packing or the like gradually decreases, and the amount of the scent finally becomes zero (almost zero). The same applies hereinafter.) Therefore, it is preferable to stop the removal of the scent component in the circulated warm water when the amount of the scent component eluted becomes zero from the viewpoint of avoiding an excessive stoppage of the production line while saving energy.

  However, Patent Literature 1 does not disclose a method of determining the time to stop cleaning, that is, the end of cleaning. Therefore, in the technique described in Patent Literature 1, the washing may be continuously performed even after the amount of the scented components eluted becomes zero, and as a result, the production line may be stopped for an excessively long time. is there.

  In addition, ozone is easily decomposed by itself. Therefore, although the elution amount of the scent component becomes zero and the object to be decomposed by the ozone (the scent component) does not exist in the warm water, the ozone can be continuously consumed by the self-decomposition of the ozone. Therefore, even if the end of the cleaning is determined based on the consumption of ozone, the accurate end cannot be determined.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a cleaning system capable of accurately grasping the end of cleaning.

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention in which the following findings have been found. That is, the gist of the present invention is a cleaning system in which the organic substance is eluted into the cleaning liquid by bringing the cleaning liquid into contact with the cleaning object to which the organic substance is adsorbed, and the cleaning object is cleaned. A cleaning liquid contacting device for contacting the cleaning liquid with the cleaning liquid to elute the organic substance into the cleaning liquid; and an ozone injection apparatus for injecting ozone for oxidatively decomposing the organic substance eluted from the cleaning target to the cleaning liquid to be brought into contact with the cleaning target. And an inflow ozone amount measuring device for measuring the amount of ozone injected by the ozone injection device, and an outflow for measuring the amount of ozone remaining after the organic matter is oxidized and decomposed by the ozone injected by the ozone injection device. an ozone amount measuring device, the quantity and a controllable cleaning liquid contact device for controlling the volume of washing liquid into contact with the object to be cleaned, the inflow amount of ozone measuring device The amount of ozone consumed is calculated using the amount of ozone measured by the above method and the amount of ozone measured by the outflow ozone amount measuring device, and the ozone amount is calculated based on the calculated ozone consumption. The end of the cleaning of the object to be cleaned is determined by calculating the rate of change of the consumption amount per time, and the amount of the cleaning liquid to be brought into contact with the object to be cleaned as the calculated rate of change per time decreases. And a calculating device for controlling the cleaning liquid contact amount control device so as to reduce the amount .

  According to the present invention, it is possible to provide a cleaning system capable of accurately grasping the end of cleaning.

It is a system diagram of a cleaning system of a first embodiment. It is a control flow performed in the cleaning system of the first embodiment. It is a system diagram of a cleaning system of a second embodiment. It is a control flow performed in the cleaning system of a second embodiment.

  Hereinafter, embodiments for implementing the present invention (the present embodiment) will be described, but the present embodiment is not limited to the following examples. In each of the drawings, some of the electric signal lines are omitted for simplification of the description. In the following description, gaseous ozone is particularly referred to as “ozone gas”. For the sake of convenience, the hot water into which ozone gas has been injected may be referred to as “hot water containing ozone”.

[1. First Embodiment]
FIG. 1 is a system diagram of a cleaning system 100 according to the first embodiment. The cleaning system 100 is performed on the piping of the beverage production line 30 used when producing dairy beverages and the like. In particular, in the cleaning system 100, although illustration and description are omitted, after performing CIP cleaning (stationary cleaning) on the pipes of the beverage production line 30, rubber packing used for connecting the pipes and the pipes, and the like. In order to remove a scent component (organic matter, for example, a citrus scent, etc.) adsorbed on the surface, cleaning by the cleaning system 100 is performed.

  That is, in the cleaning system 100, after the CIP cleaning is performed, for example, warm water (cleaning liquid) at about 80 ° C. to 90 ° C. is circulated through the pipe of the beverage production line 30 to remove the scent component remaining in the beverage production line 30. Removal (washing) is performed. In this circulation, from the viewpoint of preventing the scent component eluted in the hot water from being re-adsorbed to the rubber packing or the like, each time the hot water is allowed to flow through the beverage production line 30, the scent component in the hot water is changed using ozone gas. Has been oxidatively decomposed.

  The cleaning system 100 includes a gas-liquid reactor 11, an inflow ozone gas concentration flowmeter 12, an ozone generator 13, a gas-liquid separator 14, a mist separator 15, an outflow ozone gas concentration flowmeter 16, an ozone gas decomposition catalyst 17, And is provided. Further, the cleaning system 100 includes an arithmetic and control unit 50 that controls the inverter-controlled liquid feed pump 10 based on the concentration and flow rate of the ozone gas measured by the inflow ozone gas concentration flowmeter 12 and the outflow ozone gas concentration flowmeter 16. ing. When the liquid supply pump 10 (cleaning liquid contact device) is driven, hot water is supplied to the beverage production system 30, and the scent component is eluted in the hot water.

  Of these, the arithmetic and control unit 50 determines the end point of the cleaning using hot water, which will be described later in detail with reference to FIG. Then, the arithmetic and control unit 50 stops the driving of the liquid feed pump 10 when the cleaning end point is reached, whereby the cleaning of the beverage production line 30 is stopped. Although not shown, the arithmetic and control unit 50 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a HDD (Hard Disk Drive), an I / F (interface), and the like. And is realized by a CPU executing a predetermined control program stored in a ROM.

  The ozone gas injected into the used hot water, that is, the hot water containing the scent component, is generated in the ozone generator 13 (ozone injection device) using air as a raw material. Then, the generated ozone gas is injected into the hot water by a pump (not shown) provided in the ozone generator 13. The ozone generator 13 generates ozone gas by irradiating air with, for example, ultraviolet rays.

The concentration (C _in ) and the flow rate (Q _in ) (that is, the absolute amount of ozone to be injected into the hot water) of the generated ozone gas are measured by the inflow ozone gas concentration flow meter 12 (inflow ozone amount measurement device). , Into the used hot water in the gas-liquid reactor 11. As the inflow ozone gas concentration flowmeter 12, for example, a combination of a device capable of measuring the absorbance of light having a wavelength specific to ozone and an existing flowmeter is applicable.

  The concentration and flow rate of the ozone gas measured by the inflow ozone gas concentration flow meter 12 are input to the arithmetic and control unit 50. The control of the liquid feed pump 10 based on these values, which is performed by the arithmetic and control unit 50, will be described later with reference to FIG.

  When the ozone gas is injected into the hot water in the gas-liquid reactor 11, the scent component (organic substance) contained in the hot water comes into contact with the injected ozone (ozone gas). Then, the scent component in contact with ozone is decomposed by the oxidizing power of ozone. The decomposed scent component eventually becomes carbon dioxide. In addition, ozone included in the hot water is also decomposed by self-decomposition and changes into oxygen.

  After the ozone gas is injected into the gas-liquid reactor 11, the hot water containing ozone is supplied to the gas-liquid separator 14. Then, the gas-liquid separator 14 separates the gas such as carbon dioxide and oxygen generated by the decomposition of the scent component and the self-decomposition of ozone, and the hot water containing no scent component. The gas separated here also includes unreacted ozone gas. Then, the warm water containing no scent component is heated to, for example, about 80 ° C. to 90 ° C. by the heater 18 and then supplied to the beverage production line 30 again.

On the other hand, the mist separator 15 mainly removes water vapor from the gas separated in the gas-liquid separator 14 for measuring the concentration of ozone gas (described later). The gas from which the water vapor is mainly removed is subjected to concentration (C _out ) and flow rate (Q _out ) (ie, the absolute amount of consumed ozone) by the outflow ozone gas concentration flow meter 16 (outflow ozone amount measuring device). Is supplied to the ozone gas decomposition catalyst 17 while being measured. As the outflow ozone gas concentration flow meter 16, the same one as the inflow ozone gas concentration flow meter 12 can be applied.

  The ozone gas concentration and flow rate measured by the outflow ozone gas concentration flow meter 16 are input to the arithmetic and control unit 50. The control of the liquid feed pump 10 based on these values, which is performed by the arithmetic and control unit 50, will be described later with reference to FIG.

  Then, of the gas supplied to the ozone gas decomposition catalyst 17, the ozone gas is decomposed into oxygen, and the generated oxygen is discharged out of the system together with other gases (such as carbon dioxide and oxygen generated by self-decomposition). You.

  FIG. 2 is a control flow performed in the cleaning system 100 of the first embodiment. This control flow is performed by the arithmetic and control unit 50 (arithmetic unit) shown in FIG. 1 unless otherwise specified.

The arithmetic and control unit 50 starts the cleaning of the beverage production line 30 by starting the driving of the liquid feed pump 10 (step S101). At the same time, the arithmetic and control unit 50 drives the ozone generator 13 to generate ozone, and starts injecting ozone gas into the used hot water in the gas-liquid reactor 11 (step S102). As a result, the oxidative decomposition of the scent component contained in the used hot water is started. The arithmetic and control unit 50 drives the ozone generator 13 so that the concentration (C _in ) and the flow rate (Q _in ) of the ozone gas measured by the inflow ozone gas concentration flow meter 12 become constant. ing.

After a lapse of a predetermined time (for example, about several minutes) from the start of ozone gas injection, the arithmetic and control unit 50 uses the outflow ozone gas concentration flow meter 16 to measure the concentration (C _out ) and flow rate (Q _out ) of the ozone gas to be discharged. Is measured (step S103). These measured values are recorded in the arithmetic and control unit 50. After the start of the measurement, the measurement and recording of the concentration and flow rate of the discharged ozone gas are continued until a preset time (for example, about several tens of minutes) elapses (No in step S104).

  After the start of the measurement, when a preset time elapses (Yes direction in step S104), the arithmetic and control unit 50 calculates the ozone gas consumption rate λ at each recorded time using the following equation (1) ( Step S105). Further, the arithmetic and control unit 50 calculates the time change rate λ ′ (change rate per time λ ′) of the consumption rate λ using the calculated consumption rate λ and the following equation (2) (step S105). ).

式（１）において、Ｃ_ｉｎ及びＱ_ｉｎは、それぞれ、流入オゾンガス濃度流量計１２により計測されるオゾンガスの濃度及び流量を表し、Ｃ_ｏｕｔ及び流量Ｑ_ｏｕｔは、それぞれ、流出オゾンガス濃度流量計１６により計測されるオゾンガスの濃度及び流量を表す。

In the equation (1), C _in and Q _in represent the concentration and the flow rate of the ozone gas measured by the inflow ozone gas concentration flow meter 12, respectively, and C _out and the flow rate Q _out are respectively measured by the outflow ozone gas concentration flow meter 16. It represents the concentration and flow rate of the measured ozone gas.

  The time change rate λ ′ calculated here indicates a time change of the ozone consumption rate λ. That is, in the initial stage where not much time has passed since the start of cleaning, the amount of the fragrance component to be oxidized and decomposed is large, and the ozone consumption rate λ is also large. On the other hand, when there is almost no scent component which is oxidatively decomposed after a certain period of time from the start of cleaning, the ozone consumption rate λ becomes small. However, as described above, since ozone is self-decomposed in warm water, even if all the scent components are oxidized and decomposed and the scent components are no longer present, the ozone consumption rate λ may not become zero. On the other hand, since the temperature of the hot water is constant or substantially constant, it is considered that the self-decomposition of ozone also occurs at a constant or substantially constant rate. Therefore, the cleaning system 100 pays attention to the change in the ozone consumption rate λ (that is, the time change rate λ ′), and the change is reduced, that is, other than the self-decomposition of ozone consumed at a constant or substantially constant speed. When it is determined that ozone has not been consumed and that there is almost no scent component to be oxidized and decomposed, it is determined that the end of cleaning has reached.

  As a result of the calculation in step S105, the arithmetic and control unit 50 determines whether the calculated time change rate λ 'is equal to or less than a predetermined end point change rate λ1 (step S106). When the calculated time change rate λ ′ is equal to or less than the end point change rate λ1 (Yes in step S106), it can be said that the ozone gas consumption is substantially constant. When the consumption of the ozone gas is substantially constant, it is considered that most of the consumed ozone gas is not due to the oxidative decomposition of the fragrance component but to the self-decomposition. Therefore, in such a case, it is considered that the fragrance component to be decomposed does not exist or the amount thereof is sufficiently small, and it is considered that there is no need to perform further cleaning. Is ended (step S107). That is, the arithmetic and control unit 50 stops the injection of the ozone gas into the hot water and stops the driving of the liquid sending pump 10.

  On the other hand, when the calculated time rate of change λ ′ is larger than the end point rate of change λ1 (No in step S106), the fluctuation of the ozone gas consumption is still large. At this time, it is considered that the consumption is caused by the decomposition of the scent component in the warm water in addition to the self-decomposition of the ozone gas. Therefore, in such a case, many fragrance components are still decomposed, and it is considered that the beverage production line 30 needs to be further cleaned. Therefore, the arithmetic and control unit 50 continuously measures the concentration and the flow rate of the discharged ozone gas while continuing the cleaning of the beverage production line 30 (step S103).

  As described above, in the control performed in the cleaning system 100, the end of cleaning is determined based on the time change rate λ ′ of the ozone gas consumption rate λ. Therefore, the end of the cleaning is determined in consideration of the self-decomposition of the ozone gas. Therefore, it is possible to accurately grasp the end of cleaning while using ozone gas which can reduce environmental load but is easily decomposed in water. Also, the ozone gas exists stably even at about 100 ° C. or less. Therefore, for example, scent components contained in warm water at about 80 ° C. to 90 ° C. can be removed more stably and effectively than when activated carbon or a membrane relatively unstable to heat is used.

[2. Second Embodiment]
FIG. 3 is a system diagram of a cleaning system 200 according to the second embodiment. 3, the same components as those of the cleaning system 100 shown in FIG. 1 are denoted by the same reference numerals, and the detailed description thereof will be omitted.

  In the cleaning system 200 shown in FIG. 3, unlike the above-described cleaning system 100, the flow rate for measuring the flow rate of the used hot water discharged from the beverage production line 30 between the liquid sending pump 10 and the gas-liquid reactor 11. A total of 19 are provided. Then, the arithmetic and control unit 50 (the cleaning liquid contact amount control device) controls the liquid sending pump 10 based on the concentration of the ozone gas and the like, as described above, and the hot water measured by the flow meter 19 (the cleaning liquid contact amount control device). Is controlled based on the flow rate of the cleaning liquid.

  Specifically, when it is determined that the amount of the scent component eluted is large based on the concentration of the ozone gas or the like, it is considered that the scent component remaining in the beverage production line 30 is also large. Therefore, in such a case, the arithmetic and control unit 50 performs feedback control of the liquid feed pump 10 using the flow meter 19 in order to increase the amount of hot water circulating in the beverage production line 30. . That is, in the initial stage in which many fragrance components to be decomposed exist, washing is performed at the maximum flow rate, and the number of times of circulation of hot water to the beverage production line 30 is increased. On the other hand, when the washing proceeds to some extent and the elution amount of the scent component decreases, the output of the liquid sending pump 10 is reduced to perform the washing. Then, at the end of the cleaning, the cleaning is performed at the minimum flow rate.

  Here, the reason why the flow rate of the hot water is reduced in the cleaning system 200 as the cleaning progresses will be described. The scent component adsorbed on equipment such as rubber packing elutes into warm water with washing, and the amount of adsorption gradually decreases. At this time, the elution flux of the scent component into the warm water is considered to follow Fick's law that "diffusion flux is proportional to the concentration gradient". Therefore, in the initial stage of washing, where the amount of adsorption of the scent component is large, the concentration on the elution side (rubber packing, etc.) is high, so the concentration gradient between the diffusion side (hot water used for washing) is large, and if the elution proceeds rapidly. Conceivable. Therefore, in such a case, the hot water is circulated at the maximum flow rate in order to promote elution by circulating as much hot water as possible.

  On the other hand, near the washing end point, the concentration on the elution side decreases. Therefore, in order to ensure a large elution flux, it is preferable to sufficiently reduce the concentration on the diffusion side. Specifically, the concentration on the diffusion side near the cleaning end point is preferably lower than the concentration on the diffusion side at the beginning of cleaning. Here, the oxidative decomposition rate of the scent component contained in the warm water has a correlation with the ozone gas injection amount per unit flow rate of the warm water. In other words, as the amount of injected ozone is increased, that is, when the amount of injected ozone gas is constant as described above, the smaller the flow rate of hot water, the higher the rate of oxidative decomposition of the scent component due to contact with ozone. Therefore, near the washing end point, the oxidative decomposition of the scent component in the warm water is made more efficient by reducing the processing flow rate as described above. Thereby, the concentration of the scent component in the warm water can be sufficiently reduced. Therefore, even in the vicinity of the cleaning end point where the amount of adsorption of the scent component in the equipment such as the rubber packing is reduced, a large elution flux of the scent component into the warm water is secured, and efficient washing can be performed.

  FIG. 4 is a control flow performed in the cleaning system 200 of the second embodiment. 4, the same steps as those in the flow shown in FIG. 2 are denoted by the same step numbers, and detailed description thereof will be omitted. The control flow shown in FIG. 4 is performed by the arithmetic and control unit 50 shown in FIG. 3 unless otherwise specified.

  The arithmetic and control unit 50 starts the cleaning of the beverage production line 30 by starting to drive the liquid sending pump 10 at the maximum output (step S201). Since the output of the liquid sending pump 10 is maximized, the beverage production line 30 is cleaned with hot water having a flow rate as large as possible. Then, the time change rate λ ′ of the consumption rate λ is calculated through the same steps as steps S102 to S104 (step S105).

  Then, the arithmetic and control unit 50 determines whether or not the calculated time change rate λ 'is equal to or less than a preset pump output change change rate λ2 (step S202). The “pump output change change rate λ2” here is a value larger than the “end point change rate λ1” described in step S106 of FIG. 2 and is a value that serves as a threshold value for changing the pump output. That is, as described above, when the end of the washing is approaching, by reducing the flow rate of the hot water, the oxidative decomposition of the fragrance component can be effectively performed. Therefore, in the cleaning system 200, although the change in the consumption rate λ is not as small as the “end point change rate λ1”, if the change in the consumption rate λ is small to some extent and it is determined that the cleaning end point is close, the flow rate is reduced. By squeezing, effective oxidative decomposition of the scent component is achieved.

  As a result of the determination, when the calculated time rate of change λ ′ is equal to or less than the pump output change rate of change λ2 (and larger than the end point rate of change λ1) (Yes in step S202), the amount of the scent component to be decomposed into the warm water Is thought to be decreasing. Therefore, in this case, the circulation amount of the hot water (that is, the flow rate of the hot water) is reduced by changing the output of the liquid sending pump 10 to the minimum (step S203). Thereby, the effective decomposition and removal of the scent component can be achieved, and the end of the washing can be hastened.

  On the other hand, when the calculated time change rate λ ′ is larger than the pump output change change rate λ2 (No in step S202), the ozone gas consumption is still largely fluctuating. Therefore, the concentration and flow rate of the discharged ozone gas are measured (step S103).

  After the pump output is changed to the minimum in step S203, the arithmetic and control unit 50 performs control in the same manner as in steps S102 to S107, and the cleaning is completed.

  As described above, in the control performed in the cleaning system 200, the end of the cleaning is determined based on the time change rate λ ′ of the consumption rate λ of the ozone gas, and the output of the liquid feed pump 10 is also changed. I have. In this way, the end of the cleaning can be determined more accurately, and the cleaning can be completed earlier.

[3. Modification]
As described above, the present embodiment has been described, but the present invention is not limited to the above-described example, and the present invention can be implemented with arbitrary modifications as appropriate without departing from the gist of the present invention.

  For example, in the above example, the cleaning by the cleaning systems 100 and 200 is performed after the CIP cleaning, but the cleaning systems 100 and 200 may be applied for CIP cleaning. In this case, an alkali such as hypochlorous acid can be used as the cleaning liquid, in addition to the above-mentioned warm water. When an alkali is used, a neutralizing agent or the like can be used in combination, if necessary. For example, as the cleaning liquid used for cleaning, warm water of about 80 ° C. to 90 ° C. is used in the above example, but water of any temperature and type such as normal-temperature water may be used.

  Further, in the above example, the concentration and the flow rate of the ozone gas injected into the gas-liquid reactor 11 are fixed, but, for example, a large amount of ozone gas flows in at the initial stage of cleaning, and the injection amount of the ozone gas to be injected is gradually reduced. For example, the injection amount of the ozone gas may be changed stepwise. Further, the injection of ozone gas may be started immediately after the circulation of the hot water, or the injection of the ozone gas may be started after a while after the circulation of the hot water.

  Further, in the example shown in FIG. 4, the output of the liquid feed pump 10 is changed to only the maximum and the minimum, but as the time change rate λ ′ decreases, the output decreases stepwise. It may be. That is, for example, the output of the liquid sending pump 10 is maximum at the initial stage of the washing as described above, and thereafter, when the time rate of change λ ′ falls below a preset threshold, the output is reduced slightly. Further, when the time rate of change λ ′ falls below another preset threshold value, the output is further reduced a little, and these operations are repeated as appropriate, and finally, the output of the liquid sending pump 10 is minimized as described above. May be used. Further, although the output of the liquid pump 10 preferably decreases as the time rate of change λ ′ decreases, the output of the liquid pump 10 at the start of cleaning may not be maximum, and the output of the liquid pump 10 at the end of cleaning may be reduced. The output of the pump 10 need not be minimal.

  Further, for example, in the above example, the hot water is circulated through the beverage production line 30, but the hot water may be disposable without being circulated.

  Further, for example, in the above-described example, the scent component is exemplified as the organic substance, but may be other than the scent component such as an organic stain. Ozone has a strong oxidizing power, and therefore can effectively oxidize and decompose even organic stains.

  Further, for example, in the above example, the ozone gas separated in the gas-liquid separator 14 is decomposed by the ozone gas decomposition catalyst 17, but the ozone gas may be returned to the gas-liquid reactor 11 without being decomposed. .

  Further, for example, ozone water may be injected into hot water instead of or together with the ozone gas.

10 Liquid feed pump (cleaning liquid contact device, cleaning liquid contact amount control device)
11 gas-liquid reactor 12 inflow ozone gas concentration flow meter (inflow ozone amount measuring device)
13. Ozone generator (ozone injection device)
14 Gas-liquid separator 16 Outflow ozone gas concentration flow meter (outflow ozone amount measuring device)
19 Flow meter (cleaning liquid contact amount control device)
30 Beverage production line 50 Arithmetic control unit (arithmetic unit, cleaning liquid contact amount control unit)
100 cleaning system 200 cleaning system

Claims (4)

A cleaning system that elutes the organic substance into the cleaning liquid by contacting the cleaning liquid with the cleaning target to which the organic substance is adsorbed, and cleans the cleaning target,
A cleaning liquid contacting device that contacts the cleaning liquid with the object to be cleaned and elutes the organic substance into the cleaning liquid;
An ozone injecting device that injects ozone that oxidizes and decomposes organic substances eluted from the object to be cleaned, with respect to the cleaning liquid that comes into contact with the object to be cleaned,
An inflow ozone amount measurement device that measures the amount of ozone injected by the ozone injection device,
An outflow ozone amount measurement device that measures the amount of ozone remaining after the organic matter is oxidized and decomposed by the ozone injected by the ozone injection device,
A cleaning liquid contact amount control device capable of controlling the amount of the cleaning liquid to be brought into contact with the object to be cleaned,
The amount of ozone consumed is calculated using the amount of ozone measured by the inflow ozone amount measurement device and the amount of ozone measured by the outflow ozone amount measurement device, and the calculated consumption of ozone is calculated. Along with determining the end of the cleaning of the object to be cleaned by calculating the rate of change per hour of the consumption of ozone based on the amount, as the calculated rate of change per time becomes smaller, An arithmetic unit for controlling the cleaning liquid contact amount control device so that the amount of the cleaning liquid to be brought into contact is reduced .   The cleaning system according to claim 1, wherein the organic substance is a scent component.   3. The cleaning system according to claim 1, wherein the cleaning liquid after oxidatively decomposing organic substances by the ozone injected by the ozone injection device is brought into contact with the object to be cleaned again by the cleaning liquid contact device. 4.   The arithmetic device determines that the cleaning of the object to be cleaned has reached the end when the calculated rate of change per time becomes equal to or less than a predetermined set value, wherein: The cleaning system according to any one of claims 3 to 7.

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