JP2013169512A - Treatment apparatus of detergent drain and treatment method of detergent drain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment apparatus of detergent drain, which can carry out an efficient recovery of the detergent drain reducing an amount of organic matter in the detergent drain by a simple method.SOLUTION: A treatment apparatus 1 of detergent drain comprises a reduction device 10 which carries out a reduction treatment of the detergent drain containing an organic acid and organic matter discharged from a cleaning apparatus 26, an ion component-removing apparatus 12 removing an ion component contained in water reduction-treated by the reduction device 10, an organic matter oxidation apparatus 14 carrying out an oxidation treatment of the organic matter contained in ion component-removed treated water treated by the ion component-removing apparatus 12, and a cleaning water pipe 28 supplying at least a part of the oxidation-treated water treated by the organic matter oxidation apparatus 14 to the cleaning apparatus 26.

Description

  The present invention relates to a treatment apparatus and a treatment method for washing wastewater, and more particularly, to a treatment apparatus and treatment method for washing wastewater generated when a container such as a PET bottle before filling a beverage product or the like is washed and sterilized.

  For example, in the beverage industry, in order to clean and sterilize containers such as PET bottles before filling beverage products, organic acids such as oxonia (cleaning liquid in which acetic acid, peracetic acid and hydrogen peroxide are mixed) are used as a sterilizing agent. May be used. Oxonia or the like is jetted into a PET bottle for cleaning and sterilization. At this time, oxonia or the like remaining in the PET bottle is poured with tap water or pure water, and cleaning wastewater containing oxonia is generated. In general, water for washing PET bottles or the like is called rinser water, and water after washing is called rinser drainage.

  As a method for treating washing wastewater containing an organic acid disinfectant, Patent Document 1 discloses a method in which peracetic acid-containing water is contacted with activated carbon and then contacted with an anion exchange resin. Patent Document 2 discloses a method of supplying cleaning wastewater containing an organic acid as a bactericide to a reduction neutralization filter medium tank, and then supplying the wastewater to a reverse osmosis membrane separation device and an ion exchange resin to recover as cleaning water. Has been.

  By the way, the rinser waste water may contain a small amount of organic substances such as aldehyde. However, with the processing methods disclosed in Patent Document 1 and Patent Document 2, it is difficult to reduce and remove organic substances such as aldehydes.

  Patent Document 3 discloses a rinser drainage recovery system having a hot water sterilization function in order to prevent the growth of bacteria due to organic substances mixed in the rinser drainage. However, the method according to Patent Document 3 is intended to prevent the growth of bacteria due to the organic matter, etc. on the premise of the generation of the organic matter, and does not remove the organic matter. Moreover, equipment for manufacturing and supplying hot water is necessary, and continuous treatment of the rinser drainage is difficult.

  Patent Document 4 discloses a method in which hydrogen peroxide is added to a cleaning effluent discharged from a sterilization cleaning device such as a rinser drainage and contacted with activated carbon to remove aldehyde in the cleaning effluent. However, even the method according to Patent Document 4 does not completely decompose the aldehyde, and when the rinser waste water is recovered and reused, organic substances such as aldehyde are concentrated in the system.

JP 2001-129564 A JP 2004-202313 A JP 2007-054784 A JP 2010-247909 A

  An object of the present invention is to provide a cleaning wastewater treatment apparatus and a cleaning wastewater treatment method capable of efficiently reducing the amount of organic matter in the cleaning wastewater and recovering the cleaning wastewater efficiently. .

  The present invention removes the ionic components contained in the reduction treatment water treated by the reduction means and the reduction means for reducing the organic acid in the washing waste water containing the organic acid and organic matter discharged from the washing apparatus. An ionic component removing means, an organic substance oxidizing means for oxidizing organic substances contained in the ionic component removing treated water treated by the ionic component removing means, and at least a part of the oxidized water treated by the organic matter oxidizing means And a supply unit for supplying to the cleaning device.

  In the cleaning wastewater treatment apparatus, it is preferable that the organic matter oxidizing means irradiates the ion component removal treated water with ultraviolet rays having a wavelength of at least 185 nm.

  Moreover, it is preferable that the washing wastewater treatment apparatus further includes a circulation unit that sends at least a part of the oxidation-treated water to a preceding stage of the ion component removal unit.

  In the cleaning wastewater treatment apparatus, a plurality of the ionic component removal means are provided in parallel at a subsequent stage of the reduction means, and the reduced treated water is passed through at least one of the plurality of ionic component removal means. It is preferable that at least a part of the oxidation-treated water is passed through at least one of the ionic component removal means other than the ionic component removal means through which the reduction-treated water is passed.

  In the cleaning wastewater treatment apparatus, the reducing means is preferably filled with activated carbon.

  In the washing wastewater treatment apparatus, the ion component removing means is preferably filled with at least one of an anion exchange resin and a cation exchange resin.

  In addition, the present invention provides a reduction process for reducing the organic acid in the cleaning wastewater containing the organic acid and organic matter discharged from the cleaning device, and an ionic component contained in the reduction-treated water processed in the reduction process. At least a part of the ionic component removal process to be removed, an organic substance oxidation process to oxidize an organic substance contained in the ionic component removal treated water treated in the ionic component removal process, and at least a part of the oxidized water treated in the organic matter oxidation process And a supply step of supplying the cleaning device with the cleaning device.

  In the organic matter oxidation step in the cleaning wastewater treatment method, it is preferable that the ion component removal treated water is irradiated with ultraviolet rays having a wavelength of at least 185 nm.

  The cleaning wastewater treatment method further includes a circulation step of sending at least a part of the oxidation treated water to a preceding stage of the ion component removing means.

  Further, in the cleaning wastewater treatment method, the reduced treated water is passed through at least one of a plurality of ion component removing means provided in parallel after the reducing step, and at least a part of the oxidized treated water. However, it is preferable that the reduced treated water is passed through at least one of the ionic component removing means other than the ionic component removing means through which the reduced water has been passed.

  Moreover, it is preferable to perform a reduction process using activated carbon in the reduction step in the treatment method of the cleaning waste water.

  Moreover, it is preferable to remove an ionic component using at least one of an anion exchange resin and a cation exchange resin in the ionic component removal step in the method for treating washing waste water.

  In the cleaning wastewater treatment apparatus and the cleaning wastewater treatment method of the present invention, the amount of organic matter in the cleaning wastewater can be reduced efficiently by oxidizing the organic matter contained in the ionic component removal treated water. Washing wastewater can be collected.

It is a schematic structure figure showing an example of the washing drainage processing device concerning the embodiment of the present invention. It is a schematic block diagram which shows the other example of the washing | cleaning waste water treatment apparatus which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the washing | cleaning waste water treatment apparatus which concerns on embodiment of this invention. It is a schematic block diagram which shows the washing | cleaning waste water treatment apparatus used in Example 1. FIG. It is a schematic block diagram which shows the washing | cleaning waste water treatment apparatus used in Example 2. FIG. It is a schematic block diagram which shows the washing | cleaning waste water treatment apparatus used in the comparative example 1. It is a figure which shows the relationship between the water flow time in Example 1, 2, and the comparative example 1, and the TOC density | concentration of a treated water. 5 is a schematic configuration diagram showing a UV oxidation apparatus used in Example 3. FIG. It is a figure which shows the relationship between the UV irradiation electric power in Example 3, and the TOC density | concentration of a treated water.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

  An outline of an example of a cleaning wastewater treatment apparatus according to an embodiment of the present invention is shown in FIG. The cleaning waste water treatment apparatus 1 includes a reduction device 10 as a reduction means, an ion component removal device 12 as an ion component removal means, and an organic matter oxidation device 14 as an organic matter oxidation means. The cleaning wastewater treatment apparatus 1 may include a cleaning water storage tank 24 in the subsequent stage of the organic matter oxidation apparatus 14.

  In the cleaning wastewater treatment apparatus 1 of FIG. 1, the cleaning drainage pipe 16 from the cleaning apparatus 26 is connected to the inlet of the reduction apparatus 10, and the outlet of the reduction apparatus 10 and the inlet of the ion component removal apparatus 12 are connected by the reduction treatment water pipe 18. Connected, the outlet of the ion component removing device 12 and the inlet of the organic matter oxidizing device 14 are connected by an ion component removing treated water pipe 20, and the outlet of the organic matter oxidizing device 14 and the inlet of the washing water storage tank 24 are oxidized treated water piping 22. Connected by. The outlet of the cleaning water storage tank 24 is connected to the cleaning device 26 by a cleaning water pipe 28 as a supply means for supplying at least a part of the oxidation treated water to the cleaning device 26 as cleaning water.

  The cleaning wastewater treatment method and the operation of the cleaning wastewater treatment apparatus 1 according to the present embodiment will be described.

  An organic acid-containing cleaning water in which an organic acid for cleaning and sterilization is added to the cleaning water is supplied to the cleaning device 26 through the cleaning water pipe 28. In the cleaning device 26, for example, a container such as a PET bottle before filling with a beverage product Is cleaned and sterilized. In the cleaning device 26, an organic acid-containing cleaning water containing an organic acid is jetted into a container such as a PET bottle to perform cleaning and sterilization, and then the organic acid remaining in the container is flushed with the cleaning water. At least part of the cleaning wastewater (rinser wastewater) containing the organic acid and the like generated in the cleaning device 26 is sent to the reduction device 10 through the cleaning drainage pipe 16 and is reduced in the reduction device 10 (reduction process). The reduced treated water treated by the reducing device 10 is sent to the ionic component removing device 12 through the reduced treated water pipe 18 and the contained ionic components are removed (ionic component removing step). The ionic component removal treated water treated by the ionic component removal device 12 is sent to the organic matter oxidation device 14 through the ionic component removal treatment water pipe 20 and the contained organic matter is oxidized (organic matter oxidation step). Oxidized water treated by the organic matter oxidizer 14 is sent to and stored in the wash water storage tank 24 through the oxidized water pipe 22 as recovered wash water. The recovered washing water is supplemented with supplementary washing water as needed in the washing water storage tank 24, supplied as washing water to the washing device 26 through the washing water pipe 28 (supply process), and reused.

  The organic matter contained in the ionic component removal treated water is oxidized in the organic matter oxidizer 14, whereby the amount of organic matter in the washing wastewater is reduced by a simple method, and the washing wastewater is efficiently collected.

  The reducing device 10 is not particularly limited as long as it can reduce at least an organic acid. Examples of the reducing device 10 include a device filled with activated carbon, a device filled with a catalyst, and the like. From the viewpoint of cost effectiveness, a device filled with activated carbon is preferable.

  The ion component removing device 12 is not particularly limited as long as it removes at least ion components such as acetate ions generated by decomposition of peracetic acid or the like by a reducing device. Examples of the ion component removal device 12 include an ion exchange device filled with an ion exchange resin, a filtration device equipped with an RO membrane, and the ion exchange device filled with an ion exchange resin in terms of water recovery rate. preferable. As the ion exchange resin, a cation exchange resin, an anion exchange resin, a mixed bed of a cation exchange resin and an anion exchange resin, or the like is used.

  The organic oxidizer 14 is not particularly limited as long as it oxidizes at least organic substances. Examples of the organic oxidation device 14 include a UV oxidation device, an ozone treatment device, and a photocatalytic device.

  It is preferable that the UV oxidation apparatus irradiates ultraviolet rays having a wavelength of at least 185 nm. There are devices that emit ultraviolet light of 185 to 254 nm, and devices that emit light with 185 nm being cut off. However, since organic substances are generally easily oxidized at a wavelength of 185 nm, the organic matter oxidizing apparatus 14 For example, a UV oxidizer capable of oxidizing an organic substance by irradiating with ultraviolet rays having a wavelength of at least 185 nm is preferable. For example, a UV oxidation apparatus including a UV lamp that emits only 185 nm ultraviolet light or a UV lamp that emits 185 to 254 nm ultraviolet light may be used.

  Since the reach of 185 nm light is narrower than that of 254 nm (the effective irradiation distance is short), in order to oxidatively decompose organic substances in the ionic component removal treated water, the ionic component removal treated water is surely brought into contact with the 185 nm light. It is desirable. For that purpose, for example, an apparatus shape having a structure in which water to be treated containing organic matter passes in the vicinity of the UV lamp or a UV lamp arrangement method is used, or UV oxidation apparatuses are installed in multiple stages, and the water to be treated is A configuration that increases the probability of passing near the UV lamp is preferable. Even with the same UV irradiation power, it is possible to efficiently oxidize and decompose organic substances by installing UV oxidation devices in multiple stages, and to reduce the power consumed by the UV lamp. In addition, by installing UV oxidizers in multiple stages with the same UV irradiation power, it is possible to more effectively irradiate the ionic component removal treated water with 185 nm ultraviolet rays, so that organic substances can be efficiently oxidized and decomposed. .

  As a conventional technique, there is a system in which an ultraviolet sterilization apparatus is provided in a cleaning wastewater treatment apparatus to perform UV treatment, but this is mainly for “sterilization” by ultraviolet light of 254 nm, Even if it emits ultraviolet light, the output of 185 nm light is weak or the light of 185 nm is cut. In such a conventional ultraviolet sterilizer, even if light having a wavelength of 185 nm is output, the reach of 185 nm light is narrower than that of 254 nm as described above. It is not oxidized, and is not provided from the viewpoint of organic matter oxidation, that is, from the viewpoint of ensuring that the waste water is brought into contact with 185 nm light. That is, in such a conventional ultraviolet sterilizer, there is no idea of oxidizing the organic matter as in the present embodiment, and the organic matter is not substantially oxidized.

  For example, when an organic substance in ultrapure water is subjected to UV oxidation treatment, it is common to perform ion exchange treatment after UV oxidation. However, in the cleaning wastewater treatment apparatus according to the present embodiment, ion exchange treatment ( After the ion component removal), UV oxidation is performed. When ion exchange treatment is performed after UV oxidation, water containing ionic components such as acetate ions and organic matter is UV-oxidized, so UV is consumed for decomposition of acetate ions and the like, and the organic matter is oxidized. Hateful. Therefore, as in the cleaning waste water treatment apparatus according to the present embodiment, first, the ion irradiation process (ion component removal) removes ion components such as acetate ions, and then decomposes organic substances with UV. Reduced.

  Furthermore, even if the UV oxidation apparatus is in the last stage of the apparatus, the organic matter does not have to be completely decomposed to carbon dioxide, but may be oxidized and decomposed to an organic acid. By collecting the oxidation-treated water and using it again as washing water, the organic acid is treated by the ion component removing device when it is collected again as washing waste water, and the amount of organic acid is reduced.

  When a UV oxidation apparatus that emits ultraviolet rays of 185 to 254 nm is used, both organic oxidation by 185 nm and sterilization by 254 nm can be performed. In this case, the organic matter oxidation device 14 (organic matter oxidation means) can also serve as a sterilization device (sterilization means) for sterilizing the ionic component removal treated water. When an ozone treatment device, a photocatalyst device, or the like is used as the organic matter oxidation device 14, a sterilization device may be separately provided after the organic matter oxidation device 14. The combined use of an ozone treatment device, a photocatalyst device, and a UV oxidation device can increase the oxidation efficiency of organic matter.

The UV irradiation power of the UV lamp provided in the organic matter oxidation apparatus 14 (the calculation method will be described later) depends on the TOC concentration in the ion component removal treated water, but may be in the range of 0.05 kWh / m ^{3 to 5} kWh / m ^3. preferable. If the UV irradiation power is less than 0.05 kWh / m ³ , the effect of UV oxidation may be significantly reduced. When the UV irradiation power exceeds 5 kWh / m ³ , the organic matter is hardly oxidized even when the UV irradiation power is increased, and the efficiency of the organic matter oxidation with respect to the UV irradiation power may be reduced. Furthermore, according to the cleaning wastewater treatment method and the cleaning wastewater treatment apparatus according to the present embodiment, the circulating organic acid can be reduced and removed by the ion component removal device, and therefore, the UV irradiation power that only oxidizes the organic matter to the organic acid. Any UV irradiation power that oxidizes organic matter to carbon dioxide may be used. Therefore, in this embodiment, the organic matter in the ion component removal treated water is efficiently oxidized by setting the UV irradiation power of the UV lamp to 0.05 kWh / m ^{3 to 5} kWh / m ³ .

  The cleaning wastewater to be treated is not particularly limited as long as it is a cleaning wastewater containing organic acids and organic substances generated in the cleaning device. Examples of cleaning wastewater to be treated include cleaning wastewater generated by washing containers such as PET bottles before filling of beverage products in the beverage industry, cleaning wastewater discharged when sterilizing can products after product filling, etc. Is mentioned. Examples of organic acids include acetic acid and peracetic acid. When oxonia (a mixture of acetic acid, peracetic acid, and hydrogen peroxide) is used as a disinfectant, hydrogen peroxide is included in addition to the organic acid. Also good.

  Examples of organic substances include aldehydes such as formaldehyde and acetaldehyde, alcohols, organic solvents represented by organic chlorine compounds, and the like. For example, aldehydes may be converted to organic acids by oxidation treatment.

  FIG. 2 is a schematic configuration diagram illustrating another example of the cleaning wastewater treatment apparatus according to the present embodiment. In addition to the configuration of the cleaning wastewater treatment apparatus 1 of FIG. 1, the cleaning wastewater treatment apparatus 3 of FIG. 2 is a circulation unit that sends at least a part of the oxidation treated water (recovered cleaning water) to the front stage of the ion component removal apparatus 12. A circulation pipe 30 is further provided. In the cleaning waste water treatment apparatus 3 of FIG. 2, the oxidation treated water pipe 22 and the reduced treated water pipe 18 are connected by a circulation pipe 30. At least a part of the oxidation-treated water is sent to the upstream side of the ion component removing device 12 by the circulation pipe 30 (circulation process).

  Thereby, since the amount of water supplied to the ion component removing device 12 increases, the concentration of organic matter in the ion component removing treated water discharged from the ion component removing device 12 is reduced, and the burden on the organic matter oxidizing device 14 is reduced. In addition, by circulating the oxidation-treated water, the ionic component produced by oxidizing the organic matter by the oxidation treatment is removed from the ionic component removing device 12, so that the concentration of the organic matter in the system can be suppressed.

  Further, for example, a TOC meter 50 or the like is installed as an organic matter concentration measuring means in the oxidation treatment water pipe 22 or the like, and the TOC or the like of the oxidation treatment water oxidized by the organic matter oxidation apparatus 14 is measured, and the TOC concentration is a predetermined value. In the above case, control for circulation by the circulation pipe 30 may be performed.

  FIG. 3 is a schematic configuration diagram illustrating another example of the cleaning wastewater treatment apparatus according to the present embodiment. In addition to the configuration of the cleaning wastewater treatment apparatus 3 in FIG. 2, the cleaning wastewater treatment apparatus 5 in FIG. 3 includes a plurality of ion component removal apparatuses 12 arranged in parallel at the subsequent stage of the reduction apparatus 10.

  The washing waste water treatment apparatus 5 of FIG. 3 includes a plurality (two in the example of FIG. 3) of ion component removing devices 12a and 12b in parallel, and thus includes a plurality of circulation pipes (two in the example of FIG. 3). Yes. In the cleaning waste water treatment apparatus 5 of FIG. 3, the reduced treatment water branched from the reduction treatment water pipe 18a via the valve 32, the outlet of the reduction apparatus 10 and the inlet of the ionic component removal apparatus 12a are connected by the reduction treatment water pipe 18a. The pipe 18b is connected to the inlet of the ion component removing device 12b through the valve 34. The outlet of the ion component removing device 12a and the inlet of the organic matter oxidizing device 14 are connected by an ion component removing treated water pipe 20a, and the outlet of the ion component removing device 12b and the ion component removing treated water pipe 20a are connected. 20b is connected. A circulating pipe 30 is connected to the oxidation treated water pipe 22, the circulating pipe 30 is branched, and the circulating pipe 30a is connected to the downstream side of the valve 32 of the reduced treated water pipe 18a via the valve 36, and the circulating pipe 30b. Is connected to the downstream side of the valve 34 of the reduced water pipe 18b through the valve 38.

  For example, as shown in FIG. 3, when the valves 32 and 38 are in the “open” state and the valves 34 and 36 are in the “closed” state, the reduced water treated by the reducing device 10 is ionized by the ion component removing device 12a. At least a part of the oxidized water that has been subjected to the oxidation treatment by the organic matter oxidation device 14 after the components are removed is sent to the ion component removal device 12b.

  Thereby, in the ion component removing device 12b, the oxidized water in which the organic matter is oxidized flows, so that the organic matter is removed and the propagation of bacteria in the ion component removing device is suppressed. Even if the ion component removing device is completely stopped, the amount of organic substances in the device is reduced, so that the generation of bacteria in the device is suppressed.

  In addition, since the ionic component removal treated water discharged from the ionic component removal apparatus 12b and the ionic component removal treated water discharged from the ionic component removal apparatus 12a are mixed, the organic substance concentration can be reduced. The burden of 14 is reduced.

  Further, for example, a TOC meter 50 or the like is installed as an organic matter concentration measuring means in the oxidation treatment water pipe 22 or the like, and the TOC or the like of the oxidation treatment water oxidized by the organic matter oxidation apparatus 14 is measured, and the TOC concentration is a predetermined value. In the above case, control for circulation by the circulation pipe 30 may be performed.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

[Example 1]
Using the washing waste water treatment apparatus of FIG. 4, the TOC concentration of treated water treated under the following conditions was measured. In the cleaning waste water treatment apparatus of FIG. 4, the raw water tank 40 is installed upstream of the reduction apparatus 10, the treated water tank 42 is installed downstream of the organic matter oxidation apparatus 14, and the oxonia addition apparatus 44 is installed midway in the cleaning water pipe 28.

<Device conditions>
・ Reducing device: filled with activated carbon ・ Ion removing device: Mixed bed type of cation and anion exchange resin ・ Organic substance oxidation means: UV oxidation device (UV lamp: Model SGL-500T4U (Z) manufactured by Nippon Electric)
The UV lamp emits ultraviolet light with a wavelength of 185 to 254 nm, and irradiates with wavelengths of 185 nm and 254 nm simultaneously.

<Experimental conditions>
・ Raw water: Pure water + Oxonia (Oxonia Active 90 manufactured by Ecolab)
Oxonia concentration: 1,000 mg / L
・ Raw water flow rate: 10L / h
・ Water flow time: 72 hours continuous water flow ・ Regeneration interval of ion exchange resin: 12 hours
UV irradiation power: 0.3 kWh / m ³

[Example 2]
Using the washing waste water treatment apparatus of FIG. 5, the TOC concentration of treated water treated under the following conditions was measured. The cleaning waste water treatment apparatus of FIG. 5 further includes a circulation pipe 30 that sends at least a part of the oxidation treated water to the front stage of the ion component removal apparatus 12 in addition to the configuration of the cleaning waste water treatment apparatus of FIG.

<Device conditions>
・ Reducing device: filled with activated carbon ・ Ion removing device: Mixed bed type of cation and anion exchange resin ・ Organic substance oxidation means: UV oxidation device (UV lamp: Model SGL-500T4U (Z) manufactured by Nippon Electric)
The UV lamp emits ultraviolet light with a wavelength of 185 to 254 nm, and irradiates with wavelengths of 185 nm and 254 nm simultaneously.

<Experimental conditions>
・ Raw water: Pure water + Oxonia (Oxonia Active 90 manufactured by Ecolab)
Oxonia concentration: 1,000 mg / L
・ Raw water flow rate: 10L / h
・ Circulating water volume: 5L / h
・ Water flow time: 72 hours continuous water flow ・ Regeneration interval of ion exchange resin: 12 hours
UV irradiation power: 0.3 kWh / m ³

[Comparative Example 1]
Using the washing waste water treatment apparatus of FIG. 6, the TOC concentration of treated water treated under the following conditions was measured. The cleaning wastewater treatment apparatus of FIG. 6 includes a UV sterilization apparatus 46 instead of the organic matter oxidation apparatus 14 of the cleaning wastewater treatment apparatus of FIG. 4, and the outlet of the UV sterilization apparatus 46 and the inlet of the treated water tank 42 are connected by a pipe 48. ing.

<Device conditions>
-Reduction device: filled with activated carbon-Ion removal device: Mixed bed type of cation and anion exchange resin-Sterilization means: UV irradiation device (UV lamp: Model SGL-500T4U manufactured by Nippon Electric)
The UV lamp is a lamp in which a wavelength of 185 nm is shielded by processing the lamp surface out of 185 to 254 nm of ultraviolet light emitted from mercury atoms.

<Experimental conditions>
・ Raw water: Pure water + Oxonia (Oxonia Active 90 manufactured by Ecolab)
Oxonia concentration: 1,000 mg / L
・ Raw water flow rate: 10L / h
・ Water flow time: 72 hours continuous water flow ・ Regeneration interval of ion exchange resin: 12 hours
UV irradiation power: 0.3 kWh / m ³

  The experimental results are shown in FIG. Three hours after the start of water flow, the TOC of oxidized treated water in Example 1 and Example 2 was about 100 μg / L, but 120 μg / L was detected in the treated water in Comparative Example 1. Thereafter, in Examples 1 and 2, the TOC concentration was almost flat even when water was passed for a long time. On the other hand, in Comparative Example 1, the TOC concentration increased rapidly from around 20 hours of water passage time, and reached 261 μg / L after 72 hours.

  Thus, in Example 1 and Example 2, the amount of organic matter in the cleaning wastewater is reduced by a simple method as compared with Comparative Example 1 by oxidizing the organic matter contained in the ionic component removal treated water. It was possible to recover the washing wastewater efficiently.

[Example 3]
Since the wavelength of 185 nm effective for organic matter oxidation has a short effective irradiation distance, it is desirable that the water to be treated containing the organic matter passes near the UV lamp. Therefore, a study was conducted to increase the treatment efficiency of the UV oxidation device by installing UV oxidation devices in multiple stages and increasing the probability that the water to be treated will pass near the UV lamp.

The experimental apparatus used was the apparatus shown in FIG. Experimental conditions are shown below. As an organic component, formaldehyde, which is likely to be eluted from a plastic bottle or the like, was used. In order to evaluate the efficiency of UV oxidation, UV irradiation power per flow rate (hereinafter referred to as UV irradiation power) calculated by the following formula (1) was used. The UV irradiation power was adjusted by combining the water flow rate and the number of UV lamps lit.
UV irradiation power per flow rate (kWh / m ³ ) = lamp power (W / line) × number of lamps (line) / flow rate (m ³ / h) (1)

<Experimental conditions>
Raw water: 100 μg / L with formaldehyde TOC
・ Lamp power: 18W / piece × 1,2,4 ・ Lamp type: UV lamp (Nippo Electric Co., Ltd. Model SGL-500T4U (Z))

  FIG. 9 shows the relationship between the UV irradiation power and the TOC concentration of treated water. Even with the same UV irradiation power, there was a tendency that the concentration of the treated water TOC was lowered by installing UV oxidizers in multiple stages. This suggests that when the same treated water TOC concentration is targeted, the power consumed by the UV lamp can be reduced by using multiple stages of UV oxidation devices. In addition, it was confirmed that the TOC concentration of the treated water is lowered because the water to be treated can be more effectively irradiated with ultraviolet rays of 185 nm when the UV oxidizers are installed in multiple stages even with the same UV irradiation power.

  1, 3, 5 Washing wastewater treatment device, 10 Reduction device, 12, 12a, 12b Ion component removal device, 14 Organic substance oxidation device, 16 Washing drainage piping, 18, 18a, 18b Reduction treatment water piping, 20, 20a, 20b Ion Component removal treated water piping, 22 Oxidized water piping, 24 Washing water storage tank, 26 Cleaning device, 28 Washing water piping, 30, 30a, 30b Circulation piping, 32, 34, 36, 38 Valve, 40 Raw water tank, 42 Treatment water tank 44 Oxonia addition device, 46 UV sterilization device, 48 piping, 50 TOC meter.

Claims (12)

Reducing means for reducing the organic acid in the cleaning wastewater containing the organic acid and organic matter discharged from the cleaning device;
Ionic component removal means for removing ionic components contained in the reduced treated water treated by the reduction means;
An organic matter oxidizing means for oxidizing an organic substance contained in the ion component removing treated water treated by the ion component removing means;
Supply means for supplying at least part of the oxidized water treated by the organic matter oxidizing means to the cleaning device;
A cleaning wastewater treatment apparatus comprising: It is a processing device of washing drainage according to claim 1,
The organic matter oxidizing means irradiates the ion component removal treated water with ultraviolet rays having a wavelength of at least 185 nm. It is a processing device of washing drainage according to claim 1 or 2,
A cleaning wastewater treatment apparatus, further comprising a circulation means for sending at least a part of the oxidation treated water to a preceding stage of the ion component removal means. It is a processing device of washing drainage according to claim 3,
A plurality of the ion component removing means are provided in parallel at the subsequent stage of the reducing means,
The reduced treated water is passed through at least one of the plurality of ionic component removing means, and at least a part of the oxidized treated water is removed from ionic components other than the ionic component removed means through which the reduced treated water is passed. An apparatus for treating cleaning waste water, wherein water is passed through at least one of the means. It is a processing device of washing drainage in any one of claims 1-4,
An apparatus for treating cleaning waste water, wherein the reducing means is filled with activated carbon. It is a processing device of washing drainage in any one of claims 1-5,
The treatment apparatus for washing waste water, wherein the ion component removing means is filled with at least one of an anion exchange resin and a cation exchange resin. A reduction step of reducing the organic matter in the washing wastewater containing the organic acid and organic matter discharged from the cleaning device;
An ionic component removal step of removing an ionic component contained in the reduced treated water treated in the reduction step;
An organic matter oxidation step of oxidizing the organic matter contained in the ion component removal treated water treated in the ion component removal step;
A supply step of supplying at least a part of the oxidized water treated in the organic matter oxidation step to the cleaning device;
A method for treating cleaning wastewater, comprising: It is a processing method of washing drainage according to claim 7,
In the organic matter oxidation step, a cleaning wastewater treatment method comprising irradiating the ion component removal treated water with ultraviolet rays having a wavelength of at least 185 nm. It is a processing method of the washing drainage according to claim 7 or 8,
A method for treating cleaning wastewater, further comprising a circulation step of sending at least a part of the oxidation-treated water to a preceding stage of the ion component removing means. It is a processing method of washing drainage according to claim 9,
A plurality of the reduced treated water is passed through at least one of the ion component removing means provided in parallel at the latter stage of the reducing step, and at least a part of the oxidized treated water is passed through the reduced treated water. Washing waste water treatment method, wherein water is passed through at least one ion component removing means other than the ion component removing means. It is a processing method of washing drainage in any one of claims 7-10,
In the reduction step, the waste water is treated using activated carbon. It is a processing method of washing drainage in any one of claims 7-11,
In the ion component removing step, the washing waste water treatment method is characterized in that the ion component is removed using at least one of an anion exchange resin and a cation exchange resin.

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