Deodorization and treatment systems

Abstract

To provide a deodorization system and a processing system that can reduce the costs required for removing an odorous component.SOLUTION: A deodorization system for deodorizing an odor contained in gas containing an alkaline material comprises a first deodorizing device including: a filling tank filled with a carrier; a supply pipe for supplying the gas containing an alkaline material produced in a process of recovery treating a valuable material, to the carrier; a first sprinkling pipe for sprinkling acidic drainage produced in the process of recovery treatment, onto the carrier; and a first discharging pipe for discharging gas which has been brought into gas-liquid contact with the drainage in the filling tank.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to deodorization and treatment systems. [Background technology]

[0002] For example, various recycling facilities (hereinafter also referred to as recovery facilities) for disposable diapers and the like carry out recycling processes (hereinafter also referred to as recovery processes) of valuable materials (hereinafter also referred to as materials to be recycled) such as pulp, superabsorbent polymers (hereinafter also referred to as SAP), and plastics (see Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-135046 [Patent Document 2] Japanese Patent Application Publication No. 2020-195994 [Patent Document 3] Patent Publication No. 2021-041310 Summary of the Invention [Problem to be solved by the invention]

[0004] In the recovery facilities described above, it is desirable to reduce costs by reducing the amount of chemicals used to remove odorous components. [Means for solving the problem]

[0005] In order to achieve the above-mentioned cost reduction, the deodorizing system of the present invention is a deodorizing system that deodorizes odors contained in gas containing alkaline substances, and is equipped with a first deodorizing device having a filling tank filled with a carrier, a supply pipe that supplies gas containing alkaline substances generated during the valuable resource recovery process to the carrier, a first sprinkler pipe that sprinkles acidic effluent generated during the recovery process to the carrier, and a first discharge pipe that discharges the gas that has come into gas-liquid contact with the effluent in the filling tank. [Effects of the Invention]

[0006] According to the deodorizing system and treatment system of the present invention, it is possible to reduce the cost required for removing odorous components. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a configuration diagram of a deodorization system 100 according to the first embodiment. [Figure 2] FIG. 2 is a configuration diagram of a deodorization system 200 according to the second embodiment. [Figure 3] FIG. 3 is a configuration diagram of the processing system 1000. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Deodorization system 100 in the first embodiment] First, a description will be given of a deodorizing system 100 according to the first embodiment. Fig. 1 is a configuration diagram of the deodorizing system 100 according to the first embodiment.

[0009] 1, the deodorizing system 100 includes, for example, a first deodorizing device 10 that removes odor components contained in gas G generated during a recovery process in a recovery facility (not shown), and a second deodorizing device 20 that further removes odor components contained in gas G supplied from the first deodorizing device 10. The odor component contained in gas G is, for example, ammonia.

[0010] 1, the first deodorizing device 10 has, for example, a deodorizing tank 11 (hereinafter also referred to as a filling tank 11) into which gas G is introduced via a line L1 (hereinafter also referred to as a supply pipe L1), and a storage tank 12 that stores waste liquid W supplied from a recovery facility via a line L2. Below, a case will be described in which the deodorizing tank 11 and the storage tank 12 are integrated, but the deodorizing tank 11 and the storage tank 12 may also be provided separately.

[0011] The deodorizing tank 11 has a carrier 14 filled in the deodorizing tank 11 and a sprinkler pipe 15 (hereinafter also referred to as a first sprinkler pipe 15) that sprinkles the waste liquid W stored in the storage tank 12 into the deodorizing tank 11. The carrier 14 is, for example, a filler such as Terralet (registered trademark).

[0012] Specifically, line L2 communicates with storage tank 12 above a position where waste liquid W is stored (hereinafter also referred to as a storage position), and discharges waste liquid W from above the storage position of waste liquid W to storage tank 12. Then, the waste liquid W stored in storage tank 12 is transferred to above the loading position of carrier 14 via line L3 and line L5 by a supply device P, such as a pump, provided on line L3. Line L3 is a pipe that communicates with storage tank 12 and extends to a point where line L5 branches off into line L5 and line L12. Line L5 is a pipe that communicates with line L3 at a point where line L12 branches off, and communicates with sprinkler pipe 15. In this case, for example, valve V1 provided on line L3 and valve V3 provided on line L5 are both open, and valve V4 provided on line L12 is closed. The line L12 is a pipe that communicates with the line L3 at the point where it branches off from the line L5 and communicates with the second deodorizing device 20 (a sprinkler pipe 25 described later). The sprinkler pipe 15 sprinkles the wastewater W transferred from the storage tank 12 from above the carrier 14.

[0013] Meanwhile, line L1 communicates with deodorizing tank 11 below (the bottom side of) the loading position of carriers 14, and supplies gas G to deodorizing tank 11 from below the loading position of carriers 14 (hereinafter also referred to as the loading position). Then, gas G discharged via line L1 rises within deodorizing tank 11 after being introduced into deodorizing tank 11. Thereafter, near the loading position of carriers 14, gas-liquid contact occurs between gas G introduced into deodorizing tank 11 via line L1 (gas G rising from below carriers 14) and waste liquid W sprayed from sprinkler pipe 15 (waste liquid W sprayed from above carriers 14).

[0014] That is, near the loading position of the carrier 14, a neutralization reaction occurs between the gas G containing an alkaline substance such as ammonia and the acidic waste liquid W containing an acidic solution.

[0015] This makes it possible for the deodorization system 100 in this embodiment to remove, for example, ammonia, which is an odor component contained in the gas G discharged from the recovery facility.

[0016] Here, the above-described recovery facility is, for example, a recycling facility that crushes and cleans used disposable diapers. Therefore, the odorous component contained in the gas G discharged from the recovery facility is, for example, ammonia derived from urine. In contrast, the above-described recovery facility performs a treatment using an acidic solution such as sulfuric acid (hereinafter also referred to as acid treatment) to reduce the absorbency of SAP contained in the disposable diapers. Therefore, the wastewater W discharged from the recovery facility is discharged into the storage tank 12 with the acidic solution used in the acid treatment remaining.

[0017] Therefore, in the first deodorizing device 10, it is possible to remove odorous components contained in the gas G discharged from the recovery facility by using the waste liquid W separately discharged from the recovery facility. Therefore, in the first deodorizing device 10, it is possible to reduce the need for chemical cleaning for the purpose of removing odorous components contained in the gas G, and it is possible to reduce the cost of chemicals used in chemical cleaning.

[0018] In the first deodorizing device 10, gas-liquid contact between the gas G and the waste liquid W is carried out near the position where the carrier 14 is filled.

[0019] This makes it possible for the first deodorizing device 10 to improve the contact efficiency between the gas G and the waste liquid W, and for example, to more efficiently remove ammonia, an odorous component contained in the gas G discharged from the recovery equipment.

[0020] Returning to FIG. 1, the waste liquid W that has been brought into gas-liquid contact with the gas G is stored again in the storage tank 12 via the discharge port 11a provided at the bottom of the deodorizing tank 11, for example.

[0021] That is, the storage tank 12 stores the waste liquid W before gas-liquid contact with the gas G (neutralization reaction) and the waste liquid W after gas-liquid contact with the gas G (neutralization reaction) without distinguishing between them.

[0022] Thereafter, the first deodorizing device 10 determines whether or not the waste liquid W stored in the storage tank 12 is in a nearly neutral state at predetermined time intervals, for example, every minute.

[0023] Specifically, the control device (not shown) of the first deodorizing device 10 acquires the pH of the effluent W stored in the storage tank 12, for example, by referring to a pH measuring device M (hereinafter also referred to as a measuring device M) that measures the pH (hydrogen index) of the effluent W stored in the storage tank 12. The control device is, for example, a computer having a CPU (Central Computing Unit), memory, etc. Then, when the control device determines that the acquired pH is within a predetermined range (for example, a pH between 6 and 8), it determines that the effluent W stored in the storage tank 12 is in a nearly neutral state.

[0024] As a result, for example, if it is determined that the waste liquid W stored in the storage tank 12 is in a state close to neutral, the first deodorization device 10 supplies the waste liquid W stored in the storage tank 12 to the second deodorization device 20.

[0025] Specifically, in this case, the control device, for example, closes the valve V3 provided in the line L5, and opens the valve V4 provided in the line L12 (hereinafter also referred to as the second discharge pipe L12).The supply device P then supplies the waste liquid W stored in the storage tank 12 to the second deodorization device 20 via the line L3 and the line L12.

[0026] On the other hand, for example, if it is determined that the waste liquid W stored in the storage tank 12 is not in a state close to neutral, the first deodorization device 10 supplies the waste liquid W stored in the storage tank 12 to the sprinkler pipe 15 again.

[0027] Specifically, in this case, the supply device P transfers the waste liquid W stored in the storage tank 12 again via the line L3 and the line L5 to above the loading position of the carrier 14. Then, the sprinkler pipe 15 sprinkles the waste liquid W transferred again from the storage tank 12 from above the carrier 14. Thereafter, the waste liquid W that has passed through the carrier 14 is stored again in the storage tank 12 via the discharge port 11a.

[0028] Then, for example, when it is determined that the waste liquid W stored again in the storage tank 12 has become close to neutral, the first deodorization device 10 supplies the waste liquid W stored in the storage tank 12 to the second deodorization device 20.

[0029] On the other hand, for example, if it is determined that the waste liquid W stored again in the storage tank 12 is not in a state close to neutral, the first deodorizing device 10 repeatedly circulates the waste liquid W between the storage tank 12 and the deodorizing tank 11 until the waste liquid W stored in the storage tank 12 becomes in a state close to neutral.

[0030] This enables the first deodorizing device 10 to prevent, for example, the acidic wastewater W from being supplied to the second deodorizing device 20. Therefore, as will be described later, the first deodorizing device 10 can prevent the growth of microorganisms in the soil from being inhibited by the wastewater W supplied to the second deodorizing device 20.

[0031] The first deodorizing device 10 stops the supply of new waste liquid W from the recovery facility until the waste liquid W stored in the storage tank 12 is supplied to the second deodorizing device 20.

[0032] Next, the second deodorizing device 20 will be described. As shown in Fig. 1, the second deodorizing device 20 has a deodorizing tank 21 into which gas G is introduced via, for example, a line L11 (hereinafter also referred to as a first discharge pipe L11). Specifically, the gas G is supplied to the deodorizing tank 21 by, for example, a fan F provided in the line L11.

[0033] In the deodorizing tank 21, soil 22 is piled up on a support material 23 such as broken stones.

[0034] The soil 22 is, for example, soil inhabited by microorganisms (not shown) that grow using odorous components contained in the gas G as a nutrient source. The soil 22 removes, for example, odorous components that were not removed by the first deodorizing device 10. Specifically, the soil 22 removes, for example, odorous components other than ammonia contained in the gas G supplied from the first deodorizing device 10.

[0035] That is, the odor components contained in the gas G discharged from the recovery facility include, for example, odor components derived from feces. Such odor components cannot be removed by an acidic solution and must be removed by adsorption using, for example, activated carbon.

[0036] However, when adsorption removal is performed using activated carbon, costs for replacing the activated carbon are incurred, which increases the cost required for removing odorous components.

[0037] Therefore, in the second deodorizing device 20, the gas G supplied from the first deodorizing device 10 is supplied to the soil 22 inhabited by microorganisms that grow using the odorous components as a nutrient source, thereby removing the odorous components contained in the gas G (for example, odorous components derived from feces).

[0038] As a result, in the deodorization system 100 of this embodiment, it is possible to reduce the cost required to remove odorous components contained in the gas G discharged from the recovery facility.

[0039] 1, the second deodorizing apparatus 20 has, for example, a sprinkler pipe 25 (hereinafter also referred to as a second sprinkler pipe 25) that sprinkles the wastewater W supplied from the first deodorizing apparatus 10 via a line L3 and a line L12 onto the soil 22. Specifically, the sprinkler pipe 25 sprinkles the wastewater W supplied from the first deodorizing apparatus 10 onto the soil 22 from above.

[0040] This makes it possible for the second deodorizing device 20 to prevent the soil 22 from drying out, and to prevent the microorganisms living in the soil 22 from dying out.

[0041] Furthermore, the surface of the soil 22 is covered with plants 24 such as grass, as shown in Figure 1. This allows the second deodorizing device 20 to further prevent the soil 22 from drying out.

[0042] The effluent W supplied from the first deodorizing device 10 contains various compounds containing nitrogen derived from ammonia (e.g., ammonium nitrate and ammonium sulfate). These nitrogen compounds can be used as fertilizer for the plants 24. Therefore, by sprinkling the effluent W supplied from the first deodorizing device 10, the second deodorizing device 20 can utilize the nitrogen compounds contained in the effluent W as fertilizer for the plants 24, and can remove the various compounds containing nitrogen contained in the effluent W.

[0043] Therefore, in the deodorization system 100 of this embodiment, in addition to removing the odorous components contained in the gas G, it is possible to reduce the nitrogen load.

[0044] [Deodorization system 200 according to the second embodiment] Next, a deodorizing system 200 according to the second embodiment will be described. Fig. 2 is a configuration diagram of the deodorizing system 200 according to the second embodiment. Below, differences from the deodorizing system 100 according to the first embodiment will be described.

[0045] As shown in FIG. 2, the first deodorizing device 10 in the second embodiment has, for example, a deodorizing tank 11 into which gas G is introduced via a line L1, and a storage tank 12 in which waste liquid W is stored.

[0046] 2, the storage tank 12 in the second embodiment includes, for example, a first storage tank 12a that stores the effluent W supplied from the recovery facility via line L2, and a second storage tank 12b that stores the effluent W after deodorization in the deodorization tank 11. That is, the first storage tank 12a stores the effluent W before gas-liquid contact (neutralization reaction) with the gas G, and the second storage tank 12b stores the effluent W after gas-liquid contact (neutralization reaction) with the gas G. Hereinafter, the effluent W before gas-liquid contact with the gas G will also be referred to as effluent W1, and the effluent W after gas-liquid contact with the gas G will also be referred to as effluent W2. Hereinafter, the line connecting the first storage tank 12a and line L3 will be referred to as line L4a, and the line connecting the second storage tank 12b and line L3 will also be referred to as line L4b.

[0047] Specifically, the waste liquid W1 stored in the first storage tank 12a is transferred by, for example, a supply device P via lines L4a, L3, and L5 to above the loading position of the carrier 14. In the second embodiment, line L3 is a pipe extending from the point where lines L4a and L4b join to the point where line L5 and line L12 branch off. Line L4a is a pipe communicating with storage tank 12a and communicating with line L3 at the point where line L4b joins line L4b, and line L4b is a pipe communicating with storage tank 12b and communicating with line L3 at the point where line L4a joins line L4a. In this case, for example, valve V1 provided on line L4a and valve V3 provided on line L5 are each open, and valve V2 provided on line L4b and valve L4 provided on line L12 are each closed. The sprinkler pipe 15 sprinkles the wastewater W1 transferred from the first storage tank 12 from above the carrier .

[0048] Thereafter, the waste liquid W1 that has passed through the carrier 14 is stored as waste liquid W2 in the second storage tank 12b via the outlet 11a provided at the bottom of the deodorizing tank 11, for example.

[0049] The first deodorizing device 10 then determines at predetermined time intervals, such as every minute, whether or not the waste liquid W2 stored in the second storage tank 12b is in a nearly neutral state.

[0050] Specifically, the control device, for example, refers to a pH meter M that measures the pH of the wastewater W2 stored in the second storage tank 12b, and acquires the pH of the wastewater W2 stored in the second storage tank 12b. Then, when the control device determines that the acquired pH is within a predetermined range (for example, a pH between 6 and 8), it determines that the wastewater W2 stored in the second storage tank 12b is in a nearly neutral state.

[0051] As a result, for example, if it is determined that the waste liquid W2 stored in the second storage tank 12b is in a state close to neutral, the first deodorization device 10 supplies the waste liquid W2 stored in the second storage tank 12b to the second deodorization device 20.

[0052] Specifically, in this case, the control device, for example, closes the valve V1 provided on the line L4a and the valve V3 provided on the line L5, and opens the valve V2 provided on the line L4b and the valve V4 provided on the line L12. Then, the supply device P supplies the waste liquid W2 stored in the second storage tank 12b to the second deodorization device 20 via the line L4a, the line L3, and the line L12.

[0053] In contrast to this, for example, if it is determined that the effluent W2 stored in the second storage tank 12b is not in a nearly neutral state, the effluent W2 stored in the second storage tank 12b is not discharged to the second deodorizing device 20. Therefore, in this case, in the second storage tank 12b, when the effluent W2 exceeds the capacity of the second storage tank 12b, an overflow of the effluent W2 occurs, and a portion of the effluent W2 stored in the second storage tank 12b moves (flows out) to the first storage tank 12a.

[0054] Specifically, the first storage tank 12a and the second storage tank 12b have a communication port 12c that communicates the interiors of the first storage tank 12a and the second storage tank 12b near the ceilings of the first storage tank 12a and the second storage tank 12b, as shown in Fig. 1. Therefore, a portion of the waste liquid W2 stored in the second storage tank 12b flows out from the second storage tank 12b to the first storage tank 12a through the communication port 12c when the height of the waste liquid W2 in the second storage tank 12b reaches the height of the communication port 12c.

[0055] Furthermore, the first deodorizing device 10 transfers the waste liquid W2 stored in the first storage tank 12a (including the waste liquid W1 that has not yet been brought into gas-liquid contact with the gas G) again to the sprinkler pipe 15. By transferring the waste liquid W2 again, which includes the waste liquid W1 that has not yet been brought into gas-liquid contact with the gas G, the highly acidic waste liquid can be brought into contact with the gas G, thereby further neutralizing the gas G.

[0056] Specifically, in this case, the supply device P transfers the waste liquid W2 stored in the first storage tank 12a again via line L4a, line L3, and line L5 to above the loading position of the carrier 14. Then, the sprinkler pipe 15 sprinkles the waste liquid W2 transferred again from the first storage tank 12a from above the carrier 14. Thereafter, the waste liquid W2 that has passed through the carrier 14 is stored again in the second storage tank 12b via the discharge port 11a.

[0057] Then, for example, when it is determined that the waste liquid W2 stored again in the second storage tank 12b has become close to neutral, the first deodorization device 10 supplies the waste liquid W2 stored in the second storage tank 12b to the second deodorization device 20.

[0058] On the other hand, for example, if it is determined that the waste liquid W2 stored again in the second storage tank 12b is not in a state close to neutral, the first deodorization device 10 repeatedly circulates the waste liquid W2 between the second storage tank 12b, the first storage tank 12a, and the deodorization tank 11 until the waste liquid W2 stored in the second storage tank 12b becomes in a state close to neutral.

[0059] This enables the first deodorizing device 10 to prevent, for example, the acidic wastewater W2 from being supplied to the second deodorizing device 20. Therefore, the first deodorizing device 10 can prevent the wastewater W2 supplied to the second deodorizing device 20 from inhibiting the growth of microorganisms in the soil.

[0060] The first deodorizing apparatus 10 in the second embodiment may stop the supply of new effluent W from the recovery facility until the effluent W2 stored in the second storage tank 12b is supplied to the second deodorizing apparatus 20. The first deodorizing apparatus 10 in the second embodiment may continue to supply new effluent W from the recovery facility without stopping it, even until the effluent W2 stored in the second storage tank 12b is supplied to the second deodorizing apparatus 20.

[0061] [Processing system 1000] Next, a treatment system 1000 having the deodorizing system 100 according to the first embodiment or the deodorizing system 200 according to the second embodiment will be described. Fig. 3 is a configuration diagram of the treatment system 1000. The treatment system 1000 having the deodorizing system 100 according to the first embodiment will be described below.

[0062] As shown in FIG. 3, the treatment system 1000 includes, for example, a deodorization system 100 and a recovery facility 300 (hereinafter also referred to as treatment facility 300) that recovers valuable materials contained in disposable diapers.

[0063] The recovery facility 300 includes, for example, a first processing section 110 that shreds used disposable diapers, and a second processing section 120 that performs an acid treatment on the disposable diapers shredded in the first processing section 110.

[0064] Specifically, the first processing unit 110, for example, shreds disposable diapers supplied from a previous stage facility via line L101. Then, the first processing unit 110, for example, discharges gas G generated from the disposable diapers during shredding or before and after shredding to the deodorizing system 100 (line L1 shown in FIG. 1) via line L103.

[0065] Furthermore, the second processing unit 120 performs acid treatment using an acidic solution such as sulfuric acid on the shredded disposable diapers supplied from the first processing unit 110 via the line L102. The second processing unit 120 then discharges wastewater W generated by the acid treatment via the line L104 to the deodorizing system 100 (the line L2 shown in FIG. 1). Hereinafter, the lines L103 and L104 are also collectively referred to as the discharge unit.

[0066] The recovery facility 300 may also discharge gas G generated in facilities other than the first processing facility 110 (for example, the second processing facility 120) to the deodorization system 100, for example, via another line (not shown). The recovery facility 300 may also supply waste liquid W generated in facilities other than the second processing facility 120 (for example, the first processing facility 110) to the deodorization system 100, for example, via another line (not shown). The line L103 and the line L1 may be the same pipe. The line L104 and the line L2 may be the same pipe.

[0067] 1 and the like, the deodorizing system 100 deodorizes the odor contained in the gas G supplied from the recovery facility 300 via line L1 by using the waste liquid W supplied from the recovery facility 300 via line L2. This enables the treatment system 1000 to remove odorous components contained in the gas G generated during the recovery process in the recovery facility 300. Furthermore, as described with reference to FIG. 1 and the like, the treatment system 1000 has the deodorizing system 100 and the deodorizing system 200, which makes it possible to reduce the cost required to remove odorous components contained in the gas G. [Explanation of symbols]

[0068] 10: First deodorizing device 11: Deodorizing tank 11a: Outlet 12: Storage tank 12a: First storage tank 12b: Second storage tank 12c: Communication port 14: Carrier 15: Sprinkler pipe 20: Second deodorizing device 21: Deodorizing tank 22: Soil 23: Support material 24: Plant 25: Sprinkler pipe 100: Deodorizing system 110: First processing unit 120: Second processing unit 200: Deodorization system 300: Recovery equipment 1000: Processing system F: Fan G: Gas L1: Line L2: Line L3: Line L3: Line L4a: Line L4b: Line L5: Line L11: Line L12: Line L101: Line L102: Line L103: Line L104: Line M: PH measuring device P: Feeding device V1: Valve V2: Valve V3: Valve V4: Valve V5: Valve W: Drain W1: Drainage W2: Drainage

Claims

1. A deodorizing system for deodorizing odors contained in gas containing alkaline substances, a packed tank filled with a carrier; a supply pipe for supplying a gas containing an alkaline substance generated during the valuable resource recovery process to the carrier; a first sprinkler pipe for sprinkling acidic wastewater generated during the recovery process onto the carrier; a first exhaust pipe for exhausting the gas that has come into gas-liquid contact with the waste liquid in the filling tank;

2. soil that deodorizes the odor contained in the gas discharged from the first discharge pipe; 2. The deodorizing system according to claim 1, further comprising a second deodorizing device having a second sprinkler pipe for sprinkling the waste liquid that has come into gas-liquid contact with the gas in the filling tank onto the soil.

3. The first deodorizing device further comprises: a storage tank for storing the waste liquid before gas-liquid contact and the waste liquid after gas-liquid contact; The deodorizing system according to claim 1 , further comprising: a supply device that supplies the wastewater stored in the storage tank to the first sprinkler pipe.

4. The first deodorizing device further comprises: a second discharge pipe for discharging the waste liquid stored in the storage tank; a measuring device for measuring the hydrogen index of the effluent stored in the storage tank, 4. The deodorizing system of claim 3, wherein the supply device supplies the effluent stored in the storage tank to the first sprinkler pipe again when the hydrogen index is not within a predetermined range, and discharges the effluent stored in the storage tank to the second discharge pipe when the hydrogen index is within the predetermined range.

5. The reservoir is a first storage tank for storing the waste liquid before gas-liquid contact; a second storage tank for storing the waste liquid after gas-liquid contact; The deodorizing system according to claim 3 , wherein the supply device supplies the wastewater stored in the first storage tank to the first sprinkler pipe.

6. The first deodorizing device further comprises: a second discharge pipe for discharging the waste liquid stored in the second storage tank; a measuring device for measuring the hydrogen index of the effluent stored in the second storage tank, 6. The deodorizing system of claim 5, wherein the supply device supplies the effluent stored in the second storage tank to the first sprinkler pipe again when the hydrogen index is not within a predetermined range, and discharges the effluent stored in the second storage tank to the second discharge pipe when the hydrogen index is within the predetermined range.

7. the storage tank has a communication port at a predetermined height that communicates the interior of the first storage tank with the interior of the second storage tank; a portion of the drainage liquid stored in the second storage tank moves from the second storage tank to the first storage tank through the communication port when the height of the drainage liquid stored in the second storage tank reaches the predetermined height; 7. The deodorizing system of claim 6, wherein the supply device supplies the wastewater that has been transferred from the second storage tank to the first storage tank again to the first sprinkler pipe when the hydrogen index is not within a predetermined range.

8. a processing facility; a deodorizing system that deodorizes odors contained in the gas containing alkaline substances discharged from the treatment facility, The processing equipment comprises: a first processing section for crushing used disposable diapers; A second processing unit that performs acid treatment on the shredded disposable diapers using an acid solution; an exhaust unit that exhausts the gas and acidic waste liquid generated by the treatment in the first treatment unit and the second treatment unit, The deodorizing system a packed tank filled with a carrier; a supply pipe for supplying the gas discharged from the discharge portion to the carrier; a first sprinkler pipe that sprinkles the waste liquid discharged from the discharge portion onto the carrier; a first discharge pipe for discharging the gas that has come into gas-liquid contact with the waste liquid in the filling tank.

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