JP2006289283A - Apparatus for treating waste water, apparatus and system for recovering waste water form rinser and method for treating waste water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for recycling waste water, which has the stability higher than that of the conventional apparatus when a peroxide is decomposed and the operation of which is managed easily. <P>SOLUTION: An apparatus 20 for recovering peroxide-containing waste water from a rinser is provided with: a pH adjustment unit 21 for adjusting the pH of the peroxide-containing waste water from the rinser; a photocatalyst tank 22 having a photocatalyst and an ultraviolet light source for decomposing the peroxide contained in the waste water from the rinser; a downflow type activated carbon column 24 for decomposing the peroxide remaining in the treated water from the photocatalyst tank 22; and an ion exchange unit 25 for removing an ionic substance contained in the treated water from the activated carbon column 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rinser drainage recovery device that collects drainage from a rinser installed in an aseptic filling facility such as a soft drink, and more particularly, particularly suitable for recycling of a rinser drainage having a relatively high contaminant concentration, for example. Related devices.

  In aseptic filling equipment such as soft drinks, a container to be filled with a beverage is sterilized and washed with an apparatus called a rinser, and then a separately heat-sterilized beverage is filled in a sterile state by a filling machine. In this rinser, a container is sterilized with a sterilizing agent containing a peroxide such as hydrogen peroxide or peracetic acid, and then the container is rinsed with sterile water. The water used in the rinser is safe and high quality water equivalent to the raw water of soft drinks, that is, “drinkable water” defined by the Food Sanitation Law, and is suitable for washing after ultra-high temperature sterilization in aseptic water production equipment Sterile water cooled to temperature is used.

  Here, in general, in a rinser of a beverage aseptic filling facility, a beverage container is continuously sterilized and rinsed in conjunction with a beverage filling machine. For this reason, waste water containing peroxides such as hydrogen peroxide and peracetic acid is continuously discharged from the rinser. The kind and concentration of pollutants in the waste water from the rinser (rinser waste water) vary depending on the method of sterilization and rinsing with the rinser.

For example, Patent Document 1 discloses a conventional technique for treating the rinser drainage containing the peroxide. In the treatment apparatus described in Patent Document 1, the peracetic acid-containing wastewater is passed through an activated carbon tower to reduce peracetic acid to acetic acid, and then the activated carbon tower effluent is passed through a cation exchange tower to remove coexisting cations. Further, the effluent from the cation exchange tower is passed through the anion exchange tower to remove acetic acid produced by the reduction of peracetic acid and acetic acid derived from the raw water, thereby obtaining reusable treated water.
As another technique described in Patent Document, a processing apparatus for removing acetic acid generated by reduction of peracetic acid using a reverse osmosis membrane has been proposed (for example, see Patent Document 2).

JP 2001-129564 A (page 2-3, FIG. 1) JP 2001-170657 A (page 3-5, FIG. 1)

  According to the technique described in Patent Document 1 above, coexisting cations are removed by a cation exchange column, and acetic acid derived from reduction of peracetic acid and acetic acid derived from raw water are removed by an anion exchange column. There is an advantage that high-quality treated water is obtained at a low rate and the amount of waste water is small. In the reduction of peracetic acid to acetic acid in the activated carbon tower, oxygen and a small amount of carbon dioxide gas bubbles are generated. Therefore, the activated carbon tower has an upward flow multi-stage fluidized bed type in order to quickly remove the bubbles. An activated carbon tower is said to be suitable (see paragraph [0019] of Patent Document 1). However, in the upward flow fluidized bed activated carbon tower, when bubbles are generated in the activated carbon tower, the influence of the bubbles tends to cause a drift of water in the packed bed of activated carbon, and as a result, excess water in the treated water There is a drawback that acetic acid and hydrogen peroxide easily leak into the treated water of the activated carbon tower. That is, in the upward flow, bubbles easily escape, but there is a problem that water containing peracetic acid and hydrogen peroxide leaks to the activated carbon tower treated water together with the generation of the bubbles. These bubbles do not escape continuously and smoothly, and have a property of being released at once after being accumulated to some extent. Therefore, a water path is formed with large bubbles, and the water to be treated is easily removed.

  Here, if peracetic acid or hydrogen peroxide leaks into this activated carbon tower treated water, the following problems may occur. First, peracetic acid or hydrogen peroxide leaked into the treated water of the activated carbon tower oxidizes the cation exchange resin packed in the subsequent cation exchange tower, the cation exchange performance is lowered, and the cation removal rate is lowered. In addition, the oxidatively deteriorated cation exchange resin eluate leaks into the cation exchange tower treated water, which contaminates the anion exchange resin packed in the anion exchange tower, lowering the anion exchange performance and lowering the acetic acid removal rate. In this way, the quality of treated water may be deteriorated. There is also a problem that the amount of treated water obtained is reduced.

  On the other hand, according to the technique described in Patent Document 2, peracetic acid in the wastewater is reduced and decomposed into acetic acid in a peracetic acid decomposition tank filled with a peracetic acid reduction catalyst (activated carbon or the like). It is said that the flow direction of the waste water is preferably an upward flow type in which gas generated during peracetic acid decomposition can be easily removed (see paragraph [0026] of Patent Document 2). However, the upward flow peracetic acid reduction tank has the same drawbacks as the technique described in Patent Document 1. That is, when bubbles are generated in the peracetic acid reduction tank, water drift tends to occur in the peracetic acid reduction catalyst packed bed, and as a result, the peracetic acid and hydrogen peroxide in the treated water are treated with the activated carbon tower. Easy to leak into water. In Patent Document 2, an apparatus for adding an appropriate amount of a reducing agent (such as sodium hydrogen sulfite) is provided to reduce peracetic acid remaining in the treated water of the peracetic acid reduction tank. It becomes complicated and operation management becomes complicated. Due to the drift in the peracetic acid reduction tank, leakage of peracetic acid and hydrogen peroxide into the treated water of the peracetic acid reduction tank increases, and when the reducing agent injection amount is insufficient or the reductive decomposition of peracetic acid and hydrogen peroxide is completely performed. If not, the reverse osmosis membrane and the hydrogen peroxide leaked into the reverse osmosis membrane treatment apparatus supply water will cause oxidative degradation of the reverse osmosis membrane and the desalting rate of acetate ions and coexisting cations will decrease. In this way, the quality of treated water may be deteriorated.

  As described above, in a recycling apparatus for peracetic acid and hydrogen peroxide-containing rinser effluent having a desalting apparatus such as a conventional ion exchange processing apparatus or a reverse osmosis membrane processing apparatus, the excessively installed upstream of these desalting apparatuses. The treatment stability of the oxide decomposition apparatus was not sufficient, and operation management was complicated. However, from the viewpoint of reducing the load on the water environment by effectively utilizing water resources and reducing the amount of wastewater, for example, the necessity of collecting rinser wastewater from aseptic filling equipment is increasing. The need for this wastewater recovery is also increasing in water treatment other than the rinser wastewater treatment.

  The present invention has been made in order to solve the technical problems as described above, and the object of the present invention is to improve the stability of the decomposition treatment of peroxide as compared with the conventional apparatus and to manage the operation. Is to provide an easy-to-use wastewater recycling apparatus.

For this purpose, in the present invention, for example, wastewater having a relatively high concentration of contaminants is first decomposed using a photocatalyst tank, and then treated using a downflow type activated carbon tower. In other words, by using the photocatalyst tank to remove pollutants in the wastewater to the level where the generation of bubbles is suppressed when using the downflow type activated carbon tower, it is possible to take advantage of the downflow type. This has been possible, eliminating the drawbacks of the up-flow type activated carbon tower in the prior art.
That is, the present invention is a wastewater treatment apparatus containing a peroxide, a pH adjusting apparatus for adjusting the pH of the wastewater containing the peroxide, and the peroxide contained in the wastewater is decomposed. A photocatalyst tank having a photocatalyst and an ultraviolet light source, and a downflow type activated carbon tower for decomposing peroxide remaining in the treated water from the photocatalyst tank. As a result, the advantages of both the photocatalyst tank and the downflow type activated carbon tower are utilized, and the wastewater having a relatively high concentration of pollutants can be recovered.

  Here, it can be characterized by further comprising an ion exchange device or a reverse osmosis membrane device for removing ionic substances contained in the treated water from the activated carbon tower. Examples of the ionic substance include acetate ions and coexisting cations. This ion exchange device is characterized in that the wastewater recovery rate can be increased as compared with the reverse osmosis membrane device. On the other hand, if a reverse osmosis membrane device is used instead of the ion exchange device, it is preferable in that the device can be operated continuously.

  Further, if the photocatalyst filled in the photocatalyst tank is titanium dioxide, titanium dioxide is a substance permitted as a food additive. For example, a rinser for sterilizing and washing a beverage container in an aseptic filling facility. In view of safety as the water treatment equipment used here, it is preferable.

  Furthermore, the peroxide can be characterized in that it is peracetic acid and / or hydrogen peroxide and is a wastewater with a total concentration of peroxide to be treated of 50 to 200 mg / L. Here, when the total concentration is lower than 50 mg / L, the treatment can be performed also by the conventional activated carbon tower such as an upward flow type. In addition, when the total concentration exceeds 200 mg / L, sufficient decomposition treatment cannot be performed. Therefore, the present invention is particularly suitable for wastewater having a total concentration of peroxides such as peracetic acid and hydrogen peroxide of 50 to 200 mg / L.

  From another point of view, the present invention is a rinser drainage recovery apparatus that is connected to a rinser of an aseptic filling facility, processes drainage discharged from the rinser, and collects and reuses the rinser. A pH adjusting device for adjusting the amount of the peroxide, a photocatalyst tank having a photocatalyst for decomposing peroxide contained in the waste water and an ultraviolet light source, and a downward direction for decomposing the peroxide remaining in the treated water from the photocatalyst tank And a flow activated carbon tower.

  On the other hand, the present invention can be understood as a system including a rinser facility. That is, the rinser drainage recovery system to which the present invention is applied includes a rinser for aseptic filling equipment for sterilizing and washing containers, a rinser drainage receiving tank for receiving the rinser drainage discharged from the rinser, and the rinser drainage of the rinser drainage receiving tank downstream. Rincer drainage pump to supply to the side Rincer drainage recovery device, Rincer drainage recovery device to treat and reuse the wastewater discharged from the Rincer, and the treated water and supply processed by the Rincer drainage recovery device Comprising a relay tank to be combined with the replenished water, and a sterile water production device for sterilizing the water obtained from the relay tank, this rinser drainage recovery device flows wastewater into the photocatalyst tank filled with the photocatalyst, The peroxide contained in the waste water is adsorbed on the surface of the photocatalyst, and the photocatalyst with the peroxide adsorbed on the surface is excited by an ultraviolet light source. After decomposing the peroxide allowed, it is characterized by decomposing the peroxide remaining in the treated water from the photocatalyst reactor with activated carbon column for downward flow type.

  Furthermore, the present invention is a method for treating wastewater containing a relatively high concentration of peroxide, the step of adjusting the pH of the wastewater flowing into the photocatalyst tank, and the pH of the photocatalyst tank filled with the photocatalyst. The step of flowing the adjusted wastewater, adsorbing the peroxide contained in the wastewater on the surface of the photocatalyst, and exciting the photocatalyst with the peroxide adsorbed on the surface with an ultraviolet light source to decompose the peroxide And a step of decomposing peroxide remaining in the treated water from the photocatalyst tank by a downflow type activated carbon tower and a step of removing acetate ions and / or coexisting cations contained in the treated water from the activated carbon tower. Including.

  ADVANTAGE OF THE INVENTION According to this invention, compared with the conventional apparatus, it becomes possible to provide the waste water recycling apparatus which can improve the decomposition processing stability of a peroxide significantly, and whose operation management is easy.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[Embodiment 1]
FIG. 1 is a diagram showing an overall configuration of a rinser drainage recovery system 100 to which the present embodiment is applied. A rinser drainage recovery system 100 shown in FIG. 1 includes, for example, an aseptic filling facility rinser 10 for sterilizing and washing containers such as bottles and caps filled with beverages, and a rinser drainage recovery device for recovering and reusing the rinser drainage. 20. The rinser drainage recovery system 100 includes a rinser drainage receiving tank 11 that receives the rinser drainage discharged from the aseptic filling facility rinser 10, and a rinser drainage pump 12 that supplies the rinser drainage of the rinser drainage receiving tank 11 to the rinser drainage recovery device 20. I have. Further, the rinser drainage recovery system 100 includes a relay tank 13 that combines the treated water processed by the rinser drainage recovery apparatus 20 and the supplied makeup water. Furthermore, the aseptic water production apparatus 14 which sterilizes the water obtained from the relay tank 13 is provided.

  In the rinser drainage recovery system 100 shown in FIG. 1, the rinser drainage discharged from the aseptic filling facility rinser 10 is received in the rinser drainage receiving tank 11 and sent to the rinser drainage recovery device 20 by the rinser drainage pump 12. The rinser drainage sent to the rinser drainage recovery device 20 is processed by the rinser drainage recovery device 20 and then sent to the relay tank 13. In the relay tank 13, the activated carbon tower is washed in the rinser drainage recovery apparatus 20, and the ion exchange apparatus (described later) is regenerated or discharged to the outside of the apparatus by membrane separation in a reverse osmosis membrane apparatus (second embodiment described later) (drainage). Make-up water is added to make up for the amount of water produced. The combined water of the treated water from the rinser drainage recovery device 20 and the supplemental makeup water to be supplemented is subjected to an ultra-high temperature sterilization process in the aseptic water production device 14, and then cooled to a temperature suitable for cleaning, and the aseptic filling equipment rinser 10 and used for rinsing containers sterilized with peroxide-containing disinfectant.

Here, the flow rate of the rinser drainage discharged from one beverage filling line is, for example, 20 to 30 m ³ / h, and the temperature is, for example, 40 to 50 ° C. The type and concentration of contaminants in the rinser drainage differ depending on the method of sterilization and rinsing in the aseptic filling facility rinser 10. For example, in a relatively low concentration rinser wastewater, peracetic acid is not detected, the hydrogen peroxide concentration is 5 to 50 mg / L, the acetic acid concentration is about 0.1 to 0.3 mg / L, and the electric conductivity is 0.2 to 0.2. It is 0.4 mS / m at 25 ° C. and a pH of about 5.5 to 7.5. On the other hand, a relatively high concentration rinser drainage has a peracetic acid concentration of 20-50 mg / L, a hydrogen peroxide concentration of 50-100 mg / L, an acetic acid concentration of 50-100 mg / L, and an electrical conductivity of 5-10 mS / m. at 25 ° C. and pH of about 3.5 to 4.5. Although the present embodiment can be applied to the recycling of the former relatively low concentration rinser wastewater, it is an apparatus suitable for the latter relatively high concentration rinser wastewater recycling.

  The makeup water added in the relay tank 13 is water suitable for drinking. Examples of the water suitable for beverages include water obtained by treating activated water with activated carbon to remove residual chlorine, water obtained by treating groundwater so as to be suitable for beverages, or treating these waters with an ion exchange treatment device or a reverse osmosis membrane treatment. Demineralized water treated with an apparatus or the like is used. In particular, as demineralized water having a TOC (organic carbon) lower than that of tap water, for example, ion-exchanged water having an electric conductivity of 1 mS / m at 25 ° C. or lower is suitable for circulating water.

  FIG. 2 is a configuration diagram detailing the rinser drainage recovery apparatus 20. The rinser drainage recovery apparatus 20 to which the present embodiment is applied includes a pH adjuster 21 that adjusts the pH of the rinser drainage discharged from the rinser drainage tank 11, and peracetic acid contained in the drainage adjusted by the pH adjuster 21. Photocatalyst tank 22 having a photocatalyst for decomposing (peroxide) such as hydrogen peroxide and an ultraviolet light source, primary treatment water tank 23 for storing the photocatalyst tank treated water treated in the photocatalyst tank 22, and photocatalyst tank treated water Ions for removing acetic acid ions and coexisting cations (ionic substances) contained in the treated water of the activated carbon tower treated by the activated carbon tower 24, which decomposes peracetic acid and hydrogen peroxide remaining in the activated carbon tower 24 An exchange device 25 is provided.

  The pH adjusting device 21 is a pH indicating controller (pHIC) 31 that controls pH, a pH adjusting agent tank 32 that stores a pH adjusting agent, and a pH adjusting agent that takes out the pH adjusting agent stored in the pH adjusting agent tank 32. It has an infusion pump 33 and a mixer 34 for mixing the rinser drainage and the pH adjuster. As the pH adjuster, an alkaline aqueous solution such as caustic soda is usually used.

  In addition, the rinser drainage recovery apparatus 20 includes, as various pipes, a rinser drainage introduction pipe 41 through which the rinser drainage is introduced into the pH adjuster 21, and a pH adjustment treated water pipe 42 that connects the pH adjuster 21 and the photocatalyst tank 22. A photocatalyst treated water pipe 43 connecting the photocatalyst tank 22 and the primary treated water tank 23, a primary treated water pipe 44 connecting the primary treated water tank 23 and the activated carbon tower 24, the activated carbon tower 24 and the ion exchanger 25. An activated carbon tower treated water pipe 45 to be connected and an ion exchanger treated water pipe 46 through which the ion exchanger treated water is led out to the relay tank 13 are provided. The rinser drainage recovery apparatus 20 includes a primary treated water pump 40 provided in the primary treated water pipe 44.

  As shown in FIG. 1, the rinser drainage discharged from the aseptic filling facility rinser 10 and passing through the rinser drainage receiving tank 11 is sent to the pH adjusting device 21 through the rinser drainage introduction pipe 41 shown in FIG. In the pH adjuster 21, an alkaline aqueous solution such as caustic soda is added to the rinser drainage by the pH adjuster injection pump 33 controlled by the pH indicator controller 31, and the pH of the rinser drainage is adjusted to about 9-10. The higher the pH of the rinser wastewater, the more efficiently the decomposition of peracetic acid and hydrogen peroxide in the photocatalyst tank 22 and the activated carbon tower 24 can be performed. However, the higher the pH, the higher the concentration of the cation derived from the pH adjuster (sodium ion when the pH adjuster is caustic soda), which is the latter ion exchange device 25 (or the reverse osmosis membrane of Embodiment 2 described later). Equipment). Therefore, the pH adjusted by the pH adjusting device 21 is preferably about pH 9-10. The rinser wastewater (pH adjusted treated water) adjusted in pH by the pH adjusting device 21 is sent to the photocatalyst tank 22 through the pH adjusted treated water pipe 42.

  The photocatalyst tank 22 has a photocatalyst and an ultraviolet light source for decomposing peracetic acid and / or hydrogen peroxide contained in the pH-adjusted treated water. In this photocatalyst tank 22, the pH adjustment treated water is passed upward through the photocatalyst filled layer filled with the photocatalyst, and at the same time, the photocatalyst filled layer is irradiated with ultraviolet rays to decompose and remove peracetic acid and hydrogen peroxide in the pH adjusted treated water. . The photocatalyst tank treated water treated in the photocatalyst tank 22 is sent to the primary treated water tank 23 through the photocatalyst treated water pipe 43 and stored. By decomposing peracetic acid and / or hydrogen peroxide in the photocatalyst tank 22 and reducing the total concentration of peracetic acid and hydrogen peroxide in the photocatalyst tank treated water to 50 mg / L or less, the remaining activated carbon tower 24 remains. These peroxides are stably and almost completely removed, and the concentration of these peroxides does not adversely affect the ion exchange device 25 or the reverse osmosis membrane device (see Embodiment 2 described later), that is, The total concentration of peracetic acid and hydrogen peroxide can be kept below 0.1 mg / L.

The photocatalyst filled in the photocatalyst filling layer of the photocatalyst tank 22 adsorbs peracetic acid and hydrogen peroxide on its surface and absorbs ultraviolet energy from an ultraviolet light source to excite and adsorb these peroxides. Any type can be used as long as it can be decomposed. For example, titanium dioxide (TiO ₂ ), cadmium selenide sulfide (CdSe), cadmium sulfide (CdS), niobium oxide (Nb ₂ O ₅ ), zinc oxide (ZnO ₂ ), and the like can be given.
Among these, titanium dioxide is a substance approved as a food additive. Therefore, it is particularly suitable for this application from the viewpoint of safety as a water treatment equipment used in a rinser for sterilizing and washing beverage containers in an aseptic filling facility.
Moreover, what carried these photocatalysts in the ceramic, glass, polymer, etc. can also be used. The shape of the photocatalyst is preferably a shape having a large specific surface area and high light utilization efficiency, such as granular or non-woven fabric, so that more peracetic acid and hydrogen peroxide can be adsorbed. In addition, about a granular photocatalyst, a thing with a particle size of about 0.5-3 mm is suitable when performing upward circulating water.

  The ultraviolet light source used in the photocatalyst tank 22 is not particularly limited as long as it can excite the photocatalyst filled in the photocatalyst filling layer. For example, there are a low-pressure ultraviolet lamp, a medium-pressure ultraviolet lamp, a high-pressure ultraviolet lamp, a black light, a xenon lamp, and the like. Among them, the low-pressure ultraviolet lamp has a relatively wide light emitting area, and therefore is easy to irradiate the photocatalyst with ultraviolet rays, and is suitable for this application.

The peracetic acid and / or hydrogen peroxide adsorbed on the photocatalyst in the photocatalyst tank 22 is decomposed on the photocatalyst when the photocatalyst absorbs and excites ultraviolet irradiation energy. In addition, peracetic acid and / or hydrogen peroxide present in the water of the photocatalyst tank 22 is decomposed upon irradiation with ultraviolet rays. In any reaction, peracetic acid is decomposed into acetic acid and oxygen, and hydrogen peroxide is decomposed into water and oxygen. In order to reduce the total concentration of peracetic acid and hydrogen peroxide in a relatively high concentration rinser drainage having a peracetic acid concentration of 20 to 50 mg / L and a hydrogen peroxide concentration of about 50 to 150 mg / L to 50 mg / L or less, for example, A photocatalyst tank 22 having the following processing conditions is used.
・ Photocatalyst: Titanium dioxide (silica gel particles coated with titanium dioxide)
・ PH10
・ Water flow speed 10h ^-1
・ UV irradiation 1kW / (m ³ / h)

There is a possibility that part of oxygen generated in the photocatalyst tank 22 becomes bubbles to prevent the adsorption of peracetic acid and / or hydrogen peroxide to the photocatalyst or to inhibit the ultraviolet irradiation to the photocatalyst. Here, about 60 to 70% of these peroxides can be removed.
It is also conceivable that peracetic acid and / or hydrogen peroxide can be almost completely removed by using only the photocatalyst tank 22 by using the photocatalyst tank 22 having stronger processing conditions without installing the activated carbon tower 24 in the subsequent stage. However, on the photocatalyst 22 in the photocatalyst tank 22 and in water, a reverse reaction occurs in which hydrogen peroxide is generated from oxygen and water by ultraviolet irradiation, so that the single treatment with the photocatalyst tank 22 is not appropriate.

  The primary treated water stored in the primary treated water tank 23 is pressurized by the primary treated water pump 40 and sent to the activated carbon tower 24. The activated carbon tower 24 has a granular activated carbon packed bed. In this activated carbon tower 24, the primary treated water is passed downward through the packed bed of granular activated carbon, and peracetic acid and / or hydrogen peroxide (total concentration 50 mg / L or less) remaining in the primary treated water is brought into contact with activated carbon for decomposition and removal. The total concentration of peracetic acid and / or hydrogen peroxide is 0.1 mg / L or less.

  Here, in the reduction of peracetic acid to acetic acid in a general activated carbon tower, oxygen and a small amount of carbon dioxide gas bubbles are generated. Therefore, in order to facilitate the escape of these bubbles, an upward flow multistage fluidized bed activated carbon Towers are widely used. However, in the upward flow fluidized bed type activated carbon tower, when bubbles are generated in the activated carbon tower, the influence of the bubbles tends to cause a drift of water in the packed bed of activated carbon. Hydrogen oxide tends to leak into the activated carbon tower treated water. That is, in the upward flow type, water containing peracetic acid and hydrogen peroxide easily leaks into the activated carbon tower treated water as bubbles are generated. These bubbles are not continuously and smoothly removed, but have a property of being released at once after being accumulated to some extent. Therefore, it becomes a big bubble, a water path is formed with this bubble, and water containing peracetic acid and hydrogen peroxide flows out. Therefore, in the present embodiment, when the water after the treatment in the photocatalyst tank 22 is treated, a downward flow type is adopted in the activated carbon tower 24 shown in FIG. That is, in the present embodiment, since the waste water after the primary decomposition of peracetic acid and hydrogen peroxide is treated by the photocatalyst tank 22, the importance of facilitating the removal of bubbles is low. It is more important to suppress the outflow of water containing hydrogen peroxide. Therefore, in the present embodiment, the activated carbon tower 24 that performs secondary decomposition adopts a downward flow type in which wastewater before treatment is supplied from above and treated water is taken out from below.

In addition, the granular activated carbon with which the activated carbon tower 24 is packed will not have a restriction | limiting in a raw material and a shape, if it is suitable for peracetic acid and hydrogen peroxide. Normally, granular activated carbon such as coal-based or coconut-based is used. The height of the packed bed of granular activated carbon is about 1 to 2 m, and the space velocity of water flow is about 10 to 20 h ⁻¹ . Moreover, in the activated carbon tower 24, the backwashing with water is periodically performed, and the suspended substance derived from the rinser drainage accumulated in the granular activated carbon packed bed and the activated carbon fine powder generated by the abrasion of the activated carbon are discharged out of the activated carbon tower 24. . Further, in the activated carbon tower 24, hot water sterilization (80 to 90 ° C.) is periodically performed in order to suppress the growth of bacteria in the tower.

  The activated carbon tower treated water treated in the activated carbon tower 24 is sent to the ion exchange device 25 through the activated carbon tower treated water piping 45. In the ion exchange device 25, ionic substances such as acetate ions and coexisting cations contained in the treated water of the activated carbon tower are removed, and, for example, treated water having an electrical conductivity of 1 mS / m at 25 ° C. or lower is obtained. The ion exchange device treated water is led to the relay tank 13 through the ion exchange device treated water piping 46.

  The ion exchange device 25 is not particularly limited as long as it is a device that can remove cations of acetate ions and counter ions of acetic acid contained in the treated water of the activated carbon tower. Usually, two-bed three-column type (consisting of cation exchange tower, decarboxylation tower and anion exchange tower) or mixed bed type (mixed-bed tower is filled with cation exchange resin and anion exchange resin and water is passed in mixed state) ) Is used. As the cation exchange resin, there are a case where a strong acid cation exchange resin is used alone and a case where a weak acid cation exchange resin and a strong acid cation exchange resin are used in combination, depending on the quality of the rinser waste water. For anion exchange resins, depending on the quality of the rinser wastewater, a strong basic anion exchange resin or a weak basic anion exchange resin may be used alone, and a weak basic anion exchange resin and a strong basic anion exchange resin may be used. Sometimes used together. The ion exchange device 25 regenerates the cation exchange resin and the anion exchange resin with acid and alkali, respectively, when the water flow rate reaches the set value. In the ion exchanger 25, this water flow process and the regeneration process are alternately repeated to remove acetate ions and coexisting cations. Further, in the ion exchange device 25, hot water sterilization (80 to 90 ° C.) is periodically performed in order to suppress bacterial growth in the device.

  In addition, as waste water from the rinser waste water collection device 20, the backwash waste water and hot water sterilization waste water of the activated carbon tower 24, the regeneration waste water and hot water sterilization waste water of the ion exchange device 25 are discharged outside the device. In the relay tank 13 of the rinser drainage recovery system 100 shown in FIG. 1, an amount of makeup water corresponding to the amount of drainage discharged from the rinser drainage recovery device 20 as described above is added.

  As described above in detail, according to the first embodiment, the pH adjusting device 21, the photocatalyst tank 22, the activated carbon tower 24, and the ion exchange device 25 contain peroxides such as peracetic acid and hydrogen peroxide. The rinser drainage of the aseptic filling facility can be stably treated into recyclable water, collected in the aseptic filling facility rinser 10 and reused.

[Embodiment 2]
In the first embodiment, the activated carbon tower treated water treated in the activated carbon tower 24 shown in FIG. 2 is configured to be sent to the ion exchange device 25 through the activated carbon tower treated water piping 45. In the second embodiment, a reverse osmosis membrane device (described later) is used instead of the ion exchange device 25, and ionic substances such as acetate ions and coexisting cations contained in the treated water of the activated carbon tower are not the ion exchange device 25. The difference is that it is removed by the reverse osmosis membrane device.
In addition, the same code | symbol is used about the function similar to Embodiment 1, and the detailed description is abbreviate | omitted here.

FIG. 3 is a configuration diagram showing the rinser drainage recovery apparatus 20 according to the second embodiment. In the rinser drainage recovery device 20 shown in FIG. 3, a reverse osmosis membrane device 27 is provided in place of the ion exchange device 25 shown in FIG. Further, a reverse osmosis membrane device treated water pipe 48 through which reverse osmosis membrane device treated water is led to the relay tank 13 is provided.
The reverse osmosis membrane device 27 includes a safety filter (not shown), a reverse osmosis membrane device supply pump, a reverse osmosis membrane module unit, and a connecting pipe thereof. The reverse osmosis membrane module packed in the reverse osmosis membrane module unit is not particularly limited in material and shape as long as it can remove ionic substances such as acetate ions and coexisting cations contained in the treated water of the activated carbon tower. For example, a polyamide-based composite membrane reverse osmosis membrane module is used. In the reverse osmosis membrane module unit, although depending on the quality of the water supplied to the reverse osmosis membrane device 27, about 70 to 90% of the normal supply water is taken out from the reverse osmosis membrane device treated water piping 48 as permeated water (treated water). The remaining 10 to 30% of the concentrated water is discharged out of the apparatus. If a heat resistant reverse osmosis membrane module is used, the reverse osmosis membrane device 27 can be sterilized with hot water (80 to 90 ° C.), which is effective in suppressing the growth of bacteria.

  As the waste water from the rinser waste water recovery device 20 in the second embodiment, the reverse washing waste water and hot water sterilization waste water of the activated carbon tower 24, the concentrated water of the reverse osmosis membrane device 27, and the reverse osmosis membrane device 27 that performs hot water sterilization. For hot water, hot water drainage is discharged outside the equipment. In the relay tank 13 of the rinser drainage recovery system 100 shown in FIG. 1, an amount of makeup water corresponding to the amount of drainage discharged from the rinser drainage recovery device 20 as described above is added.

  Thus, according to the second embodiment, the reverse osmosis membrane device 27 is used in place of the ion exchange device 25 of the first embodiment. Then, as in the first embodiment, the rinser drainage of the aseptic filling facility containing peroxides such as peracetic acid and hydrogen peroxide is stably treated into recyclable water and collected in the aseptic filling facility rinser 10. It can be reused.

  As described above in detail, according to the present embodiment (Embodiment 1 and Embodiment 2), the photocatalyst tank 22 and the down-flow type activated carbon tower 24 are used to form a predetermined aseptic filling equipment rinser 10 or the like. It is possible to provide a wastewater recovery device that can decompose peroxides such as peracetic acid and hydrogen peroxide contained in the wastewater from the facility more stably than conventional devices and that can be easily managed. In addition, it is possible to provide a wastewater recovery system with high processing stability and easy operation management. This makes it possible to save water resources by reducing the amount of water used and to reduce the load on the water environment by reducing the amount of drainage.

  The present invention can be applied to, for example, a wastewater collection device of various facilities such as an aseptic filling facility that recycles rinser wastewater, a wastewater collection system including a wastewater collection device, and the like.

It is the figure which showed the whole structure of the rinser waste_water | drain collection | recovery system with which this Embodiment is applied. It is the block diagram which detailed the rinser waste_water | drain collection | recovery apparatus. It is the block diagram which showed the rinser waste_water | drain collection | recovery apparatus in Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Aseptic filling equipment rinser, 11 ... Rincer drainage tank, 12 ... Rincer drainage pump, 13 ... Relay tank, 14 ... Aseptic water production apparatus, 20 ... Rincer drainage collection apparatus, 21 ... pH adjuster, 22 ... Photocatalyst tank, 23 ... primary treatment water tank, 24 ... activated carbon tower, 25 ... ion exchange device, 27 ... reverse osmosis membrane device, 100 ... rinser drainage recovery system

Claims (10)

A wastewater treatment apparatus containing peroxide,
A photocatalyst tank having a photocatalyst for decomposing peroxide contained in waste water and an ultraviolet light source;
A wastewater treatment apparatus comprising a downflow type activated carbon tower for decomposing peroxide remaining in treated water from the photocatalyst tank.   The wastewater treatment apparatus according to claim 1, further comprising an ion exchange device or a reverse osmosis membrane device for removing ionic substances contained in the treated water from the activated carbon tower. It further comprises a pH adjusting device for adjusting the pH of the wastewater containing the peroxide,
The wastewater treatment apparatus according to claim 1 or 2, wherein wastewater whose pH is adjusted by the pH adjustment device passes through the photocatalyst tank.   The wastewater treatment apparatus according to any one of claims 1 to 3, wherein the photocatalyst filled in the photocatalyst tank is titanium dioxide.   5. The peroxide according to claim 1, wherein the peroxide is peracetic acid and / or hydrogen peroxide, and is a waste water having a total concentration of the peroxide to be treated of 50 to 200 mg / L. The waste water treatment apparatus as described. A rinser drainage recovery device connected to a rinser of an aseptic filling facility, treating drainage discharged from the rinser, and collecting and reusing the rinser with the rinser,
A photocatalyst tank having a photocatalyst for decomposing peroxide contained in waste water and an ultraviolet light source;
A rinser drainage recovery apparatus comprising a downflow type activated carbon tower for decomposing peroxide remaining in treated water from the photocatalyst tank. A rinser with aseptic filling equipment to sterilize and clean containers;
A rinser drainage recovery device for treating and recycling the drainage discharged from the rinser to the rinser;
The rinser drainage recovery device flows wastewater into a photocatalyst tank filled with a photocatalyst, adsorbs the peroxide contained in the wastewater on the surface of the photocatalyst, and absorbs the photocatalyst on which the peroxide is adsorbed on the surface of the photocatalyst. A rinser drainage recovery system characterized in that, after being excited by a light source and decomposing the peroxide, the peroxide remaining in the treated water from the photocatalyst tank is decomposed by a downflow type activated carbon tower. A rinser drainage tank for receiving the rinser drainage discharged from the rinser;
A rinser drainage pump for supplying the rinser drainage of the rinser drainage tank to the rinser drainage recovery device;
A relay tank that combines the treated water treated by the rinser drainage recovery device and the supplied makeup water;
The rinser drainage recovery system according to claim 7, further comprising an aseptic water production apparatus for sterilizing water obtained from the relay tank. A method for treating wastewater containing peroxide,
The wastewater flows into the photocatalyst tank filled with the photocatalyst, the peroxide contained in the wastewater is adsorbed on the surface of the photocatalyst, and the photocatalyst with the peroxide adsorbed on the surface is excited by an ultraviolet light source. Decomposing the oxide;
And a step of decomposing peroxide remaining in the treated water from the photocatalyst tank with a downflow type activated carbon tower. Adjusting the pH of the wastewater flowing into the photocatalyst tank;
The method for treating waste water according to claim 9, further comprising a step of removing acetate ions and / or coexisting cations contained in the treated water from the activated carbon tower.

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