JP6203024B2 - Washing waste liquid treatment apparatus and washing waste liquid treatment method - Google Patents

Description

  The present invention relates to a washing waste liquid treatment apparatus and a washing waste liquid treatment method, and particularly relates to a washing facility of a nuclear power plant, and in order to suppress corrosion of the washing waste liquid treatment apparatus and high concentration of radionuclides, The present invention relates to a laundry waste liquid treatment apparatus and a laundry waste liquid treatment method capable of removing impurity components such as object ions and radionuclides with high efficiency.

  In a nuclear power plant, whether work clothes worn in the controlled area are washed in the laundry facility, and the concentration of radionuclide in the washing waste liquid is measured to confirm that the concentration is sufficiently low before being released to the environment. Or have been recovered and reused. Although the nature of the washing waste liquid depends on the washing method, washing by washing with a washing detergent is generally used as currently practiced in ordinary households.

  When the above washing waste liquid is discharged into the environment or recovered and reused, in addition to the above-mentioned radionuclide concentration, chemical oxygen demand that is an indicator of pH, suspended solids concentration (SS concentration), organic matter concentration It is necessary to release (COD: Chemical Oxygen Demand) below the reference value for release or recovery. Further, the pH of the washing waste liquid needs to be controlled and adjusted within a certain range.

  For this purpose, a nuclear power plant is equipped with a laundry facility, which is composed of a washing machine for washing work clothes and a washing waste liquid treatment device. The laundry waste liquid treatment apparatus is installed mainly for the purpose of removing or concentrating radionuclides, suspended solids (SS content) and COD present in the waste liquid.

  Most of the radionuclides present in the laundry waste liquid are accompanied by a solid content called clad, and most can be removed by carrying out a filtration treatment with a filter (filter). Similarly, the SS component can be removed by filtration. On the other hand, the COD component is mainly composed of a surfactant added as a detergent, and also contains oils and fats attached to work clothes and sebum components from the human body.

  In order to remove these COD components, various waste liquid treatment apparatuses and waste liquid treatment methods have been conventionally developed. Since the COD component is an organic substance, it is adsorbed and removed by activated carbon (for example, see Patent Document 1), a method for adding an oxidizing agent such as hydrogen peroxide to decompose the COD component (for example, see Patent Document 2), In addition, a method of evaporating and concentrating washing waste liquid itself by using a low foaming detergent has been developed.

  The present invention is capable of suppressing the corrosion of the evaporative concentrator in the evaporative concentration process using the low foaming detergent used when recovering and reusing the treated water, and the concentrated liquid has an excessive radionuclide concentration. The present invention provides a laundry waste liquid treatment apparatus and a laundry waste liquid treatment method capable of suppressing the above.

Japanese Patent Laid-Open No. 06-331792 Japanese Unexamined Patent Publication No. 07-027898

Evaporation concentration treatment is an excellent treatment method in which washing waste liquid containing radionuclide, SS and COD is concentrated by an evaporation concentrator, and all components can be concentrated in the liquid. On the other hand, underwear, socks, gloves, and the like, which are the items to be washed, are in direct contact with the skin, so washing them also concentrates sweat components released from the human body. Among the sweat components, chloride ions (Cl ⁻ ) (discharged as NaCl) corrode the evaporative concentrator, so a concentration upper limit value is set. Normally, the concentrated liquid is discharged from the evaporative concentrator when the chloride ion concentration of the concentrated liquid reaches 5,000 ppm. In particular, in the summer when there is a lot of sweating, the concentration of chloride ions in the washing waste liquid is high, and the concentrated liquid is discharged without being able to be sufficiently concentrated, leading to an increase in waste.

  Moreover, the outermost part of the work clothes among the items to be washed may be contaminated by contact with the radioactive material, and the radionuclide may be mixed into the washing waste liquid. The radionuclide that has been mixed is concentrated by an evaporating concentrator, and there is a second problem that the concentration of the radionuclide in the discharged concentrate may become excessively high.

  Furthermore, the recovered water after evaporation and concentration does not contain impurities, so it can be reused. However, it is good to repeat washing frequently, but if the interval between washings is long, the collected recovered water may be spoiled. The third issue is also raised. This is because the recovered water (distilled water, condensate) after evaporation and concentration does not contain disinfecting components like tap water, so that fungi in the air are mixed and propagated.

  The present invention has been made in order to solve the above-described problems, and allows chloride ions and radionuclides to be removed in advance before evaporative concentration treatment, thereby allowing sufficient concentration treatment (high concentration treatment) of washing waste liquid. An object of the present invention is to provide a laundry waste liquid treatment apparatus and a laundry waste liquid treatment method.

In order to achieve the above object, a washing waste liquid treatment apparatus according to the present invention includes a water washing step for washing laundry including work clothes used in a management area of a nuclear facility using only water. A laundry facility that performs a washing process of washing laundry using water and a detergent; an evaporation concentrator that evaporates and concentrates water of laundry waste liquid discharged from the laundry facility; A first desalting tower that removes impurity ions contained in the condensed condensate, and at least a portion of the wash water discharged from the water washing process of the laundry facility, and chlorides contained in the wash water It is characterized by comprising an activated carbon adsorption tower and a second desalting tower for removing ions and a surfactant, and a radionuclide adsorption tower for removing radionuclides contained in the separated washing water.

The laundry waste liquid treatment method according to the present invention includes a water washing step of washing the laundry including work clothes used in the management area of the nuclear facility using only water, and the laundry to be washed with water. Washing process using a detergent, evaporative concentration process for evaporating and condensing the water content of washing waste discharged from the laundry facility, and impurity ions contained in the condensed water evaporated and condensed from the evaporative concentration process. First demineralization treatment step to be removed, and activated carbon adsorption treatment step of separating at least a part of the washing water discharged from the water washing step and removing chloride ions and surfactant contained in the washing water And a second desalting treatment step, and a radionuclide adsorption treatment step for removing the radionuclide contained in the collected wash water.

  According to the laundry waste liquid treatment apparatus and the laundry waste liquid treatment method according to the present invention, the wash water discharged from the washing process for washing the laundry contaminated with radioactive substances and the sweating of workers by using only water. Since the chloride ions and surfactant contained in the washing water and the radionuclide are removed in advance before the evaporative concentration treatment, the corrosion load on the evaporative concentrator is low, And the outstanding effect that the sufficient concentration process (high concentration process) of washing waste liquid is attained is exhibited.

The system diagram which shows the structure of the conventional washing waste liquid processing apparatus. The systematic diagram which shows the structure of one Example of the washing waste liquid processing apparatus which concerns on this invention. The graph which shows the chloride ion density | concentration of washing waste water (rinsing water) and a washing waste liquid in case a to-be-washed thing is a worker's underwear. The graph which shows the chloride ion concentration and COD (chemical oxygen demand) in the activated carbon adsorption tower exit and 2nd desalting tower exit of washing water (rinsing water). Explanatory drawing which shows the operation mode of a washing facility (washing machine). The systematic diagram which shows the discharge process of the rinse water containing a chloride ion in a washing waste liquid processing apparatus. FIG. 3 is a system diagram showing a discharge process of washing waste liquid from the laundry facility in the washing waste liquid treatment apparatus. The systematic diagram which shows the transfer process route in the case of containing a chloride ion in washing water (rinsing water) in a washing waste liquid processing apparatus. FIG. 3 is a system diagram showing a transfer processing route in a case where the washing water (rinse water) contains both chloride ions and radionuclides in the washing waste liquid treatment apparatus. FIG. 3 is a system diagram showing a transfer processing route when a washing water (rinse water) contains neither chloride ions nor radionuclides in a washing waste liquid treatment apparatus. The systematic diagram which shows the concentration process process of a washing waste liquid in a washing waste liquid processing apparatus. The systematic diagram which shows the transfer process route in the case of reusing collect | recovered water as washing water in a washing waste liquid processing apparatus. The graph which shows the relationship between the presence or absence of the removal of the chloride ion from washing water (rinsing water), and the interval of concentrate discharge. In a washing waste liquid processing apparatus, the system diagram which shows an apparatus structure at the time of utilizing a reverse osmosis membrane apparatus as a 2nd desalting tower. In a washing waste liquid processing apparatus, the system diagram which shows an apparatus structure at the time of utilizing an electrolyzer as a 2nd demineralization tower. Sectional drawing which shows the reaction which occurs in the structure of an electrolysis apparatus, and a process liquid. FIG. 3 is a system diagram showing a device configuration when a measuring device for measuring chloride ion concentration and radionuclide concentration in washing water (rinsing water) is installed in a rinsing water receiving tank in a washing waste liquid treatment apparatus.

  Hereinafter, embodiments of the laundry waste liquid treatment apparatus and the treatment method according to the present invention will be described with reference to the accompanying drawings.

  First, in order to clarify the difference between the device of the present invention and the conventional device, the conventional device will be described first with reference to FIG. In a nuclear facility such as a nuclear power plant, used work clothes, underwear, gloves, socks, etc. are collected by type, and the same items are weighed and put into a laundry facility (washing machine) 2. Thereafter, water and the low-foaming detergent 1 for evaporative concentration are put into the washing machine according to a preset program, and washing is performed.

  As a result of the washing, the laundry waste liquid discharged is collected in the laundry waste liquid collection tank 4 through the laundry waste liquid pipe 3. Subsequently, the washing waste liquid is supplied to the evaporation concentrator 6 by the waste liquid pump 5, heated by the superheater 7 and concentrated. This concentrated concentrate 8 is discharged out of the system from the evaporation concentrator 6. Then, when the evaporated vapor generated in the evaporation concentrator 6 passes through the demister 9, liquid particles entrained in the gas phase are captured. After passing through the demister 9, it is returned to water by a condenser 10 and collected in a distilled water receiving tank 11.

  The water condensed in the condenser 10 is then passed through a distilled water pump 12 to a desalting tower 13 filled with a mixture of a strongly acidic cation exchange resin and a strongly basic anion exchange resin. After the impurities are removed by water, they are stored in the recovered water tank 14. The collected recovered water is transferred by the recovered water pump 15, passes through the recovered water pipe 16, and is used again by the washing machine 2.

In particular, since the chloride ion adhering to the underwear of the worker is almost entirely transferred to the washing waste liquid 3 and concentrated, the chloride ion in the concentrated liquid in the evaporative concentrator is particularly concentrated in the summer when there is a lot of sweating. There was a problem that the increase in concentration was large and the time to reach the concentration upper limit (Cl ⁻ : 5,000 mg / L) was shortened.

Example 1
In order to solve the above-mentioned problem, as shown in FIG. 2, a laundry waste liquid treatment apparatus according to an embodiment of the present invention uses only water for laundry to be washed including work clothes used in a management area of a nuclear facility. A washing facility 2 for performing a water washing process for washing using laundry and a washing process for washing the laundry using water and the detergent 1; Evaporative concentrator 6 for concentration, first demineralizer 13 for removing impurity ions contained in condensed water evaporated and condensed from evaporative concentrator 6, and washing discharged from the water washing step of laundry facility 2 Activated carbon adsorption tower 20 and second demineralization tower 21 for separating at least a part of water and removing chloride ions and surfactant contained in the washing water, and radioactive contained in the collected washing water A radionuclide adsorption tower 22 for removing nuclides; Composed of Te.

  In addition, in order to remove both the chloride ions that are contained in the wash water (rinse water) discharged from the water washing step and affect the corrosion of the evaporation concentrator and the surfactant components that are eluted from the laundry, The activated carbon adsorption tower 20 and the second desalting tower 21 are arranged in series to treat the washing water, and the treated water that has passed through these is discharged from the washing process following the washing process. And are processed by the evaporative concentrator 6.

  Further, when the washing water discharged from the water washing step contains a radioactive substance in addition to chloride ions and a surfactant, the treatment was passed through the activated carbon adsorption tower 20 and the second demineralization tower 21. The liquid is further passed through the radionuclide adsorption tower 22, and the treated liquid is combined with the washing waste liquid discharged from the washing process and the concentration process is performed by the evaporative concentrator 6. Also good.

  Differences between the processing apparatus of the first embodiment shown in FIG. 2 and the conventional processing apparatus shown in FIG. 1 will be described below. That is, the major difference from the conventional apparatus is that a rinsing process is carried out by water washing at the beginning of the washing mode in the washing facility, and the rinsing water receiving tank 18 is used to receive the washing water (rinsing water) discharged at this time. Has been deployed. Furthermore, an activated carbon adsorption tower 20 and a second demineralization tower 21 were provided in order to remove chloride ions contained in the waste liquid (rinse water) collected in the rinse water receiving tank 18. Moreover, in order to remove the radionuclide contained in the rinse water, the radionuclide adsorption tower 22 is provided.

  For the used underwear worn by workers, the chloride ion concentration of the waste liquid (rinse water) discharged in the first water-rinsing process and the detergent after washing with water were washed. As a result, the chloride ion concentration of the discharged laundry waste liquid was measured and the result shown in FIG. 3 was obtained.

  That is, the chloride concentration contained in the rinsing water is 90-100 ppm, and the chloride ion concentration contained in the washing waste liquid is 5-10 ppm. If the product ions are removed, the chloride ion load when supplied to the evaporation concentrator 6 can be reduced.

  Methods for removing chloride ions contained in rinse water include adding silver nitrate to form a poorly soluble silver chloride precipitate and collecting the precipitate by filtration, or removing it with a bismuth-based inorganic ion adsorbent However, there is a problem that the former method is difficult to apply because of the high cost of the reagent. Even in the case of removing with the latter adsorbent, the adsorbent is a fine powder, so that it is difficult to recover with a filter.

  As the most general method, the second demineralization tower 21 in which both a strongly acidic cation exchange resin and a strongly basic anion exchange resin are mixed and packed is effective. The ion exchange resin has few problems in terms of performance and cost with respect to adsorption and removal of chloride ions. One of the reasons why the activated carbon adsorption tower 20 is provided in the previous stage of the second desalting tower 21 is to remove a small amount of SS (suspended solids) contained in the rinse water, and the other reason is to rinse. This is for adsorbing and removing a trace amount of surfactant contained in water. This is because the laundry component is repeatedly worn and washed, so that a part of the detergent component remains in the work clothes and the like, and when the water washing is performed, the detergent component is eluted in the rinse water, so that the detergent component is removed.

  Here, chloride ions are adsorbed and removed by a strongly basic anion exchange resin. However, since strongly basic anion exchange resins have the property of easily adsorbing organic substances such as surfactants, activated carbon is used in advance to prevent the removal of chloride ions from being inhibited. It is preferable to remove organic substances by adsorption.

  FIG. 4 is a graph showing the results of measuring the chloride ion concentration and COD (chemical oxygen demand) contained in the rinse water at the outlet of the activated carbon adsorption tower and the outlet of the second demineralization tower. COD can be effectively removed by an activated carbon adsorption tower. On the other hand, it is clear that chloride ions can be effectively removed in the second demineralization tower, although the removal effect in the activated carbon adsorption tower is small.

  A series of washing wastewater treatment steps will be described below with reference to FIGS. FIG. 5 shows a schematic flow of the washing process of the washing facility (washing machine) 2. First, a laundry such as work clothes weighed in advance is put into the washing machine. Subsequently, a water washing step by water injection and rotation of the washing drum is performed for a preset time.

  Thereafter, the laundry is centrifugally dehydrated, while the rinse water is discharged to the rinse water receiving tank 18 via the rinse water pipe 17 shown in FIG. When the water rinsing process is completed, as shown in FIG. 5, the detergent 1 is injected into the laundry facility 2 and washing for removing dirt is performed. The washing process includes a “rinse-centrifugal dehydration process” and the like, and these washing waste liquids are discharged to the washing waste liquid collection tank 4 via the washing waste liquid piping 3 shown in FIG. After these water washing and washing with the detergent 1 are finished, the laundry is taken out from the laundry facility 2 and dried with a dryer.

  The waste liquid (rinse water) collected in the rinse water receiving tank 18 has different levels of chloride ions and radionuclide concentrations depending on the type and season of clothing, and therefore the process to be treated continuously differs. For example, when washing clothes that have absorbed sweat such as underwear of an operator are washed, the chloride ion concentration of the rinse water is high, but is not contaminated with radioactive substances, as shown in FIG. As described above, after the activated carbon adsorption tower 20 and the second desalting tower 21 are passed through to remove chloride ions, the radionuclide adsorption tower 22 is bypassed and transferred to the washing waste liquid collection tank 4.

  Further, when both the chloride ion concentration and the radionuclide concentration in the waste liquid (rinse water) are high, as shown in FIG. 9, the activated carbon adsorption tower 20 and the second demineralization tower 21 are passed through, and further the radionuclide. After passing through the adsorption tower 22, it is transferred to the washing waste liquid collection tank 4.

  Here, as the adsorbent filled in the radionuclide adsorption tower 22, an inorganic ion adsorbent such as zeolite or vermiculite, a synthetic adsorbent such as ferrocyanide, or the like can be selected.

  When it is clear that the rinse water does not contain chloride ions or radioactive substances, the washing waste liquid directly passes through the activated carbon adsorption tower 20, the second desalting tower 21, and the radionuclide adsorption tower 22 as shown in FIG. Transfer to collection tank 4.

  As shown in FIG. 11, the washing waste liquid and the treated rinse water collected in the washing waste liquid collection tank 4 are supplied to the evaporation concentrator 6 by the waste liquid pump 5 and concentrated, and the steam passes through the demister 9 and is condensed. It is returned to water by the vessel 10 and collected in the distilled water receiving tank 11.

  Distilled water collected in the distilled water receiving tank 11 is collected in the recovered water tank 14 after being treated in the first demineralizer 13 in order to remove volatile components such as ammonia. As shown in FIG. 12, the recovered water recovered in the recovered water tank 14 is transferred by the recovered water pump 15, is returned to the washing facility 2 through the recovered water pipe 16, and is reused as the washing water.

  The first desalting tower 13 is filled with a mixture of both a strongly acidic cation exchange resin and a strongly basic anion exchange resin, as in the case of the chloride ion removal apparatus.

  FIG. 13 shows the case where the direct evaporative concentration treatment is performed without rinsing water treatment as in the conventional treatment apparatus, and the case where the rinsing water is separately collected (sorted) and the chloride ions are removed as in this embodiment. It is the graph which compared the discharge | emission interval of the concentrate in the case where it integrates with a washing waste liquid and it evaporates and concentrates. In the case of directly evaporating and concentrating without rinsing water treatment, the discharge interval of the concentrated liquid is about 400 hours, and it is necessary to frequently perform the discharge operation. On the other hand, by separating and collecting the rinsing water and removing chloride ions in advance as in this example, the concentrated solution discharge interval was about 6 times 2,500 hours, and the amount of waste generated was also reduced.

(Example 2)
Next, Embodiment 2 will be described with reference to FIG. The laundry waste liquid treatment apparatus according to the second embodiment is the laundry waste liquid treatment apparatus according to the first embodiment, and removes chloride ions that are included in the wash water discharged from the water washing step and affect the corrosion of the evaporation concentrator. For this purpose, the activated carbon adsorption tower and the reverse osmosis membrane device as the second desalting tower are arranged in series.

  That is, the difference between the laundry waste liquid treatment apparatus of the first embodiment and the laundry waste liquid treatment apparatus according to the second embodiment is the same as that of the first embodiment in order to remove chloride ions contained in the rinse water. The place where the 2 desalting tower 21 was used was replaced with a reverse osmosis membrane device 21 '.

  The reverse osmosis membrane device 21 ′ is a desalination device mainly used for seawater desalination, and can remove chloride ions contained in the liquid to be treated at a removal rate of 99% or more. . When the ion exchange resin is used, it is discarded when the adsorption capacity is lost, but the reverse osmosis membrane device can be operated stably for a long period of time.

  As described above, since the rinse water contains a surfactant in a low concentration, the activated carbon adsorption tower 20 is disposed in the previous stage in the same manner as when the second demineralization tower 21 is used to avoid the adverse effect. It is preferable to remove the surfactant component in advance by the activated carbon adsorption tower 20 before water is passed through the reverse osmosis membrane device 21 ′. That is, as in the case where a strongly basic anion exchange resin is used, the activated carbon adsorption tower 20 is necessary because the desalination performance is reduced when an organic substance (in this case, a surfactant) is adsorbed on the reverse osmosis membrane surface. .

(Example 3)
Next, Embodiment 3 will be described with reference to FIG. The laundry waste liquid treatment apparatus according to the third embodiment is the laundry waste liquid treatment apparatus according to the first embodiment, and removes chloride ions that are included in the washing water discharged from the water washing step and affect the corrosion of the evaporation concentrator. For this purpose, the activated carbon adsorption tower and the electrolysis apparatus 21 "as the second demineralization tower are arranged in series. Further, hypochlorous acid generated in the anode chamber of the electrolysis apparatus 21" is prevented from decaying. And a disinfectant supply device 28 for adding to the recovered water.

  The laundry waste liquid treatment apparatus according to the third embodiment is characterized in that the electrolytic device 21 ″ is used for removing chloride ions in the rinse water. Thus, rinse water containing chloride ions is used. By subjecting to electrolysis, sodium hypochlorite that can be used as a disinfectant can be obtained.

  Similarly to the case of using the reverse osmosis membrane device 21 ′ of Example 2, an electrolytic device 21 ″ is arranged at the rear stage of the activated carbon adsorption tower 20, and the sodium hypochlorite produced by the electrolytic device 21 ″ is hypochlorous acid. It is supplied to the bactericide tank 23 via the chloric acid pipe 25. Sodium hypochlorite supplied to the disinfectant tank 23 is transferred by the disinfectant transfer pump 24 and added to the recovered water in the recovered water tank 14 to exert a sterilizing effect, and effectively rot the recovered water. To prevent.

  FIG. 16 shows the internal structure of the electrolyzer 21 ″ and the reaction in the liquid. The waste liquid (rinse water) treated in the activated carbon adsorption tower 20 is placed in the cathode chamber of the two-chamber electrolyzer separated by the anion exchange membrane. Electrolysis of water on the cathode surface makes the waste liquid in the cathode chamber alkaline, and chloride ions in the waste liquid move to the anode chamber through an anion exchange membrane that allows only anions to pass through. Some of the chloride ions that have moved to the anode chamber are dissipated into the atmosphere as chlorine gas, but most of them are hypochlorous acid and exist in the liquid.

  Here, hypochlorous acid generated in the anode chamber of the electrolyzer 21 ″ is transferred to the sterilizing agent tank 23 and further injected into the recovered water by the sterilizing agent transfer pump 24. Sterilization of the injected hypochlorous acid. As a result, the above-mentioned hypochlorous acid uses chloride ions originally contained in the worker's sweat as a disinfectant, so a separate disinfectant Purchase of is no longer necessary.

Example 4
Next, Embodiment 4 will be described with reference to FIG. The laundry waste liquid treatment apparatus according to the fourth embodiment is the same as the laundry waste liquid treatment apparatus according to the first embodiment, in which both chloride ion concentration and radionuclide concentration contained in the wash water discharged from the water washing step are measured in advance. There is provided a control device for automatically measuring a selected combination of activated carbon adsorption treatment, desalination treatment, and radionuclide adsorption treatment according to each measured concentration. Provided and configured.

  In addition, to each processing apparatus of the activated carbon adsorption tower 20, the 2nd desalination tower 21, and the radionuclide adsorption tower 22 which comprises the washing waste liquid processing apparatus which concerns on Examples 1-4, a to-be-processed liquid is introduce | transduced in each apparatus. A treatment pipe and a bypass pipe for bypassing the liquid to be treated are provided, and although not shown, each treatment pipe and the bypass pipe are each provided with a flow rate adjusting valve for controlling the flow rate. ing.

  In the laundry waste liquid treatment apparatus according to Example 4 above, the concentrations of both chloride ions and radionuclide concentrations contained in the rinse water are measured, and the control device controls each bypass pipe and each treatment pipe according to the concentration value. The flow rate adjustment valve installed in the control is adjusted and controlled to automate the rinsing water treatment process.

  Specifically, a small loop is formed in the rinse water receiving tank 18, and a chloride ion concentration and radionuclide concentration measuring device 26 is installed in the small loop. For example, if the chloride ion concentration is 10 mg / L or less, the control device closes the flow rate adjusting valve interposed in each processing pipe so as not to pass the processing route in the activated carbon adsorption tower 20 and the second demineralization tower 21. .

On the other hand, when the concentration of the radionuclide contained in the rinse water is 1E ⁻⁴ Bq / ml or less, each processing step is performed by setting a logic that does not allow the rinse water to pass through the water flow route to the radionuclide adsorption tower. Can be automatically selected.

  DESCRIPTION OF SYMBOLS 1 ... Detergent, 2 ... Laundry facilities (washing machine), 3 ... Laundry waste piping, 4 ... Laundry waste collection tank, 5 ... Laundry waste liquid transfer pump, 6 ... Evaporative concentrator, 7 ... Superheater, 8 ... Concentrate, 9 Demister, 10 ... condenser, 11 ... distilled water receiving tank, 12 ... distilled water transfer pump, 13 ... first demineralizer, 14 ... recovered water tank, 15 ... recovered water transfer pump, 16 ... recovered water piping, 17 ... Rinsing water piping, 18 ... Rinsing water receiving tank, 19 ... Rinsing water transfer pump, 20 ... Activated carbon adsorption tower, 21 ... Second desalting tower, 21 '... Reverse osmosis membrane device, 21 "... Electrolysis device, 22 ... Radionuclide adsorption tower, 23 ... bactericidal tank, 24 ... bactericidal transfer pump, 25 ... hypochlorous acid piping, 26 ... measuring device for chloride ion concentration and radionuclide concentration, 27 ... rinse water pump, 28 ... bactericidal agent Feeding device.

Claims (8)

A water washing process for washing laundry including work clothes used in the management area of a nuclear facility using only water and a washing process for washing the laundry using water and a detergent. A laundry facility to carry out, an evaporation concentrator that evaporates and concentrates the water of the laundry waste liquid discharged from the laundry facility,
A first demineralization tower for removing impurity ions contained in the condensed water evaporated and condensed from the evaporative concentrator, and at least a part of the washing water discharged from the water washing process of the laundry facility, and the washing water Activated carbon adsorption tower and second demineralization tower for removing chloride ions and surfactant contained in
A radionuclide adsorption tower that removes radionuclides contained in the collected wash water;
A washing waste liquid treatment apparatus comprising: In order to remove both the chloride ions that affect the corrosion of the evaporative concentrator and the surfactant components that are eluted from the laundry, contained in the washing water discharged from the water washing step, the activated carbon adsorption tower and The second demineralization tower is arranged in series to treat the washing water, and the treated water after passing through these is combined with the washing waste liquid discharged from the washing process following the water washing process to evaporate the concentrator The washing waste liquid treatment apparatus according to claim 1, wherein the washing waste liquid treatment apparatus is used. When the washing water discharged from the water washing step contains a radioactive substance in addition to chloride ions and a surfactant, the treatment liquid passed through the activated carbon adsorption tower and the second desalting tower is further radioactive. 3. Washing according to claim 2, wherein the water is passed through a nuclide adsorption tower, the treated liquid is combined with the washing waste liquid discharged from the washing step, and the concentration process is performed in an evaporative concentrator. Waste liquid treatment equipment. The activated carbon adsorption tower and the reverse osmosis membrane apparatus as the second demineralization tower are connected in series in order to remove chloride ions contained in the washing water discharged from the water washing step and affecting the corrosion of the evaporation concentrator. 3. The laundry waste liquid treatment apparatus according to claim 2, wherein In order to remove chloride ions contained in the wash water discharged from the water washing step and affecting the corrosion of the evaporation concentrator, the activated carbon adsorption tower and the electrolyzer as the second demineralization tower are arranged in series. The laundry waste liquid treatment apparatus according to claim 2, wherein In order to remove chloride ions contained in the wash water discharged from the water washing step and affecting the corrosion of the evaporation concentrator, the activated carbon adsorption tower and the electrolyzer as the second demineralization tower are arranged in series. The laundry waste liquid treatment apparatus according to claim 5, further comprising a disinfectant supply device for adding hypochlorous acid generated in the anode chamber of the electrolysis device to the recovered water to suppress spoilage. Both chloride ion concentration and radionuclide concentration contained in the wash water discharged from the water washing step are measured in advance, and activated carbon adsorption treatment, desalination treatment, and radionuclide adsorption treatment according to each concentration. 2. The laundry waste liquid treatment apparatus according to claim 1, further comprising a control device that automatically performs the selected combination. A water washing process for washing laundry including work clothes used in a management area of a nuclear facility using only water; a washing process for washing laundry to be washed using water and a detergent; An evaporative concentration step for evaporating and concentrating the water of the washing waste liquid discharged from the laundry facility, a first desalting step for removing impurity ions contained in the condensed water evaporated and condensed from the evaporative concentration step, and the water A second desalting treatment step for separating at least a part of the wash water discharged from the washing step and removing chloride ions and surfactant contained in the wash water; And a radionuclide adsorption process for removing the radionuclide.

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