JP6290503B1 - Surface treatment equipment, wastewater treatment equipment, and wastewater treatment method - Google Patents

Abstract

The present invention provides a surface treatment facility, a wastewater treatment facility, and a wastewater treatment method capable of reducing costs. A surface treatment facility includes a first reaction tank that forms an oxide film on a metal surface with a stored phosphoric acid aqueous solution, and a second reaction that forms an oxide film on a metal surface with a stored boric acid aqueous solution. A tank 220, a third reaction tank 110 that forms an oxide film on the metal surface with an aqueous solution different from the stored phosphoric acid aqueous solution and boric acid aqueous solution, a first reaction tank 210, a second reaction tank 220, and a third reaction Cleaning units 120 and 230 for cleaning the metal on which the oxide film is formed by the tank 110, and waste water processing units 140 and 260 for processing the waste water discharged from the cleaning units 120 and 230 are provided. In the surface treatment facility 1, the metal in which the oxide film is formed by the first reaction tank 210 and the second reaction tank 220 is cleaned by the common cleaning unit 230, and the metal in which the oxide film is formed by the third reaction tank 110. Is washed by the washing unit 120 corresponding to only the third reaction tank 110. [Selection] Figure 1

Description

  The present invention relates to a surface treatment facility for subjecting a material to surface treatment and washing, a wastewater treatment facility for treating wastewater generated by washing a material subjected to surface treatment, and a wastewater treatment method.

  Wastewater generated by subjecting the material to surface treatment needs to be appropriately treated. Various techniques for treating the waste water generated by the surface treatment have been developed.

  For example, Patent Document 1 discloses a waste water treatment apparatus for treating waste water generated when an anodized film is formed on a metal surface.

JP, 2006-123949, A

  Patent Document 1 discloses a wastewater treatment facility in which ion exchange paths for adsorbing ions in wastewater are subdivided into four systems. This Patent Document 1 has been well received as a useful invention because it has achieved no drainage. However, it has been found that these four systems of non-drainage treatment equipment cannot be handled by the existing three systems of plating treatment equipment. Therefore, there is an urgent need to solve this problem. In addition, the three systems of non-drainage treatment apparatus can reduce the cost.

  The present invention has been made paying attention to such problems, and provides three systems of non-drainage surface treatment equipment, wastewater treatment equipment, and wastewater treatment methods in three systems of plating treatment equipment. In addition, the purpose is to reduce the cost.

  In order to achieve the above object, the surface treatment facility of the present invention includes a first reaction tank that forms an oxide film on a metal surface with a stored phosphoric acid aqueous solution, and an oxide film formed on the metal surface with a stored boric acid aqueous solution. A second reaction tank, a third reaction tank for forming an oxide film on the surface of the metal with an aqueous solution different from the stored phosphoric acid aqueous solution and boric acid aqueous solution, the first reaction tank, the second reaction tank, And a washing part for washing the metal on which the oxide film is formed by the third reaction tank, and a waste water treatment part for treating the waste water discharged from the washing part, the first reaction tank and the second reaction The metal in which the oxide film is formed by the tank is cleaned by the common cleaning unit, and the metal in which the oxide film is formed by the third reaction tank is cleaned by the cleaning unit corresponding to only the third reaction tank. You , Characterized in that.

  A plurality of the cleaning units provided in common in the first reaction tank and the second reaction tank are provided, and the metal on which the oxide film is formed is sequentially cleaned by the plurality of cleaning units provided, The number of the cleaning units provided in common in one reaction tank and the second reaction tank may be larger than the number of the cleaning units corresponding to only the third reaction tank.

  Of the cleaning units provided in common in the first reaction tank and the second reaction tank, the cleaning water used in the first cleaning unit is more than the cleaning water used in the other cleaning units. May be reduced.

  Of the cleaning units provided in common in the first reaction tank and the second reaction tank, the cleaning water used in the cleaning unit provided first is evaporated by the crystallizer. May be processed.

  The waste water treatment unit includes a storage tank that stores the waste water from the cleaning unit, an ion exchange tower for adsorbing ions contained in the waste water transferred from the storage tank, and a treatment generated by the ion exchange tower. Transporting means for transporting and circulating water to the washing section, and a water supply facility for replenishing tap water may be connected to the storage tank.

  In order to achieve the above object, the wastewater treatment facility of the present invention is commonly used for cleaning a metal having an oxide film formed on the surface with an aqueous phosphoric acid solution and cleaning a metal having an oxide film formed on the surface by an aqueous boric acid solution. A first cleaning unit, a second cleaning unit for cleaning a metal having an oxide film formed on the surface thereof by an aqueous solution different from the phosphoric acid aqueous solution and the boric acid aqueous solution, and drainage discharged from the first cleaning unit A first waste water treatment unit for treating the waste water, and a second waste water treatment unit for treating the waste water discharged from the second cleaning unit.

  In order to achieve the above object, the wastewater treatment method of the present invention uses a common first metal having an oxide film formed on the surface with an aqueous phosphoric acid solution and a metal having an oxide film formed on the surface with an aqueous boric acid solution. The first cleaning unit is configured to clean the metal having an oxide film formed on the surface with an aqueous solution different from the phosphoric acid aqueous solution and the boric acid aqueous solution in a second cleaning unit different from the first cleaning unit. The waste water discharged from the first part is treated by a first waste water treatment part, and the waste water discharged from the second cleaning part is treated by a second waste water treatment part different from the first waste water treatment part.

  According to the present invention, it is possible to provide a surface treatment facility, a wastewater treatment facility, and a wastewater treatment method that can reduce costs.

The figure which shows the structural example of the surface treatment equipment which concerns on embodiment of this invention. The figure which shows the structure of a primary washing water treatment facility. The figure which shows the structure of a chromic acid type ion exchange equipment. The figure which shows the structure of a phosphoric acid and boric-acid type ion exchange equipment. The figure which shows the structure of an alkaline ion exchange facility. The figure which shows the structure of a washing water treatment facility.

  Hereinafter, a surface treatment facility, a wastewater treatment facility, and a wastewater treatment method according to the present invention will be described with reference to the drawings.

(Overall configuration of surface treatment equipment 1)
FIG. 1 is a diagram illustrating a configuration example of a surface treatment facility according to an embodiment of the present invention. As shown in FIG. 1, the surface treatment facility 1 includes a chromic acid surface treatment facility 100 that performs surface treatment on a material to be treated using a chromic acid bath, and a material to be treated using a phosphoric acid bath and a boric acid bath. A phosphoric acid boric acid surface treatment facility 200 that performs surface treatment and an alkaline surface treatment facility 300 that performs surface treatment on a material to be treated using an alkaline bath are provided. In addition, each apparatus which comprises the surface treatment equipment 1 shall be connected by piping, and the movement of water shall be performed. The surface treatment facility 1 shown in FIG. 1 includes a reaction tank in which the surface treatment is performed, and a wastewater treatment facility that cleans the material to be treated and treats the wastewater generated at that time. Yes.

(Configuration of chromic acid surface treatment facility 100)
The chromic acid-based surface treatment facility 100 includes a chromic acid-based reaction tank 110 for anodizing (forming an anodized film) on aluminum as a material to be treated, and a storage washing tank 120 for washing the anodized material to be treated. And the running water washing unit 130, the primary washing water treatment facility 140 for treating the primary washing water from the stored washing tank 120, and the chromic acid ion exchange facility 150 for treating the secondary washing water from the running water washing unit 130. I have.

  The chromic acid reaction tank 110 contains, for example, a chromic acid aqueous solution as an electrolytic solution. In the chromic acid reaction tank 110, the material to be treated is immersed in a chromic acid aqueous solution and electrolyzed as an anode. Thereby, an oxide film is formed on the surface of the material to be treated (anodizing treatment). The anodized material to be treated is transported from the chromic acid reaction tank 110 to the stored cleaning tank 120 by a transport device (not shown).

  The storage cleaning tank 120 stores cleaning water for cleaning the anodized material to be processed. The conveyed material to be treated is washed with washing water stored in a storage washing tank 120 which is a washing unit. Of the primary washing water generated in this way, the supernatant water is guided to the running water washing unit 130 through a pipe (not shown). On the other hand, the remaining wash water is guided to the primary wash water treatment facility 140 as primary wash water. The material to be processed cleaned in the storage cleaning tank 120 is transferred to the running water cleaning unit 130 by a transfer means (not shown).

  Although the details will be described later, the primary washing water treatment facility 140 is a waste water treatment unit that treats the primary washing water guided from the stored washing tank 120. The treated water that has been treated is returned to the stored washing tank 120 and used as reclaimed water.

  The running water cleaning unit 130 includes a shower nozzle (not shown) that jets cleaning water. As water sprayed from this shower nozzle (not shown), supernatant water guided from the storage washing tank 120 and treated water guided from a chromic acid ion exchange facility 150 described later are used. The material to be treated conveyed from the stored washing tank 120 to the running water washing unit 130 is washed with water sprayed from a shower nozzle (not shown). The cleaning water for the material to be treated is guided to the chromic ion exchange facility 150 as secondary cleaning water. The material to be treated cleaned by the running water cleaning unit 130 is transported toward the next process equipment by a transport means (not shown).

  Although the details of the chromic acid ion exchange facility 150 will be described later, the secondary washing water guided from the running water washing unit 130 is processed. The treated water is sent to the running water cleaning unit 130 and reused as water sprayed from a shower nozzle (not shown).

(Configuration of phosphoric acid boric acid-based surface treatment facility 200)
The phosphoric acid boric acid surface treatment facility 200 includes a phosphoric acid reaction tank 210 and a boric acid reaction tank 220 for anodizing (forming an anodized film) on aluminum as a material to be treated. Moreover, the phosphoric acid boric acid type surface treatment facility 200 includes a common cleaning unit 230 that cleans the material to be treated that has been anodized in the phosphoric acid type reaction tank 210 and the boric acid type reaction tank 220, a storage cleaning tank 240, and running water A cleaning unit 250, a cleaning water treatment facility 260 that processes the cleaning water from the cleaning unit 230, a primary cleaning water processing facility 270 that processes primary cleaning water from the stored cleaning tank 240, and a secondary from the running water cleaning unit 250. Phosphoric acid and boric acid ion exchange equipment 280 for treating the washing water. In this way, the materials to be treated that have been anodized in the phosphoric acid reaction tank 210 and the boric acid reaction tank 220 are cleaned by a common cleaning facility. Moreover, in the phosphoric acid boric acid type surface treatment facility 200, unlike the chromic acid type surface treatment facility 100, the material to be treated is washed by the washing unit 230 as a pre-cleaning process in the storage washing tank (primary washing) 240. A process is provided.

  For example, a phosphoric acid aqueous solution is placed in the phosphoric acid reaction vessel 210 as an electrolytic solution. On the other hand, the boric acid reaction tank 220 contains, for example, an aqueous boric acid solution as an electrolytic solution. In these reaction vessels, the material to be treated is immersed in an aqueous solution and electrolyzed as an anode. Thereby, an oxide film is formed on the surface of the material to be treated (anodizing treatment). The material to be treated that has been anodized in the phosphoric acid reaction vessel 210 and the boric acid reaction vessel 220 is conveyed to the cleaning unit 230 by a conveying device (not shown).

  The cleaning unit 230 includes a shower nozzle (not shown) that ejects cleaning water. The conveyed material to be processed is cleaned in the cleaning unit 230 by water sprayed from a shower nozzle (not shown). The water sprayed here is a smaller amount than the water sprayed by the flowing water cleaning unit 250 described later. In this way, by washing the materials to be treated taken out from the reaction vessels 210 and 220 with a small amount of water, high-concentration washing water is guided from the washing unit 230 to the washing water treatment facility 260.

  As will be described in detail later, the cleaning water treatment facility 260 adjusts the pH of the high-concentration cleaning water led from the cleaning unit 230 and then solidifies and processes it with a crystallizer.

  In addition, the transfer process of the to-be-processed material and washing water in the subsequent phosphoric acid boric acid type surface treatment equipment 200 is the same as that of the chromic acid type surface treatment equipment 100. Therefore, the details are omitted.

(Configuration of alkaline surface treatment equipment 300)
The alkaline surface treatment facility 300 includes an alkaline reaction tank 310 for anodizing (forming an anodized film) on aluminum as a material to be treated, a storage washing tank 320 for washing the anodized material to be treated, and running water. A cleaning unit 330, a primary cleaning water treatment facility 340 for processing primary cleaning water from the stored cleaning tank 320, and an alkaline ion exchange facility 350 for processing secondary cleaning water from the running water cleaning unit 330 are provided. .

  The alkaline reaction vessel 310 contains an alkaline aqueous solution such as a sodium hydroxide aqueous solution or a sodium carbonate aqueous solution as an electrolytic solution. In the alkaline reaction vessel 310, the material to be treated is immersed in an aqueous solution and electrolyzed as an anode. Thereby, an oxide film is formed on the surface of the material to be treated (anodizing treatment). The anodized material to be treated is transported from the alkaline reaction tank 310 to the stored cleaning tank 320 by a transport device (not shown).

  The subsequent transfer process of the material to be treated and the washing water in the alkaline surface treatment facility 300 is the same as that in the chromic acid surface treatment facility 100. Therefore, the details are omitted.

(Configuration of primary washing water treatment facility 140)
Next, the structure of the primary washing water treatment facility 140 in the chromic acid surface treatment facility 100 will be described. FIG. 2 is a diagram illustrating a configuration of the primary washing water treatment facility. The primary washing water treatment facility 140 includes a natural settlement treatment facility 160 that performs treatment of primary washing water using natural settlement, an MF membrane treatment device 171 for treating the supernatant water from the natural settlement treatment facility 160, and a UV meter. The activated carbon tower 172, the RO device 173, and the mixed bed ion exchange device 174, the dehydration processing equipment 175, the decompression processing device 176, and the crystallizer 177 are provided.

  The natural settlement processing facility 160 processes the primary washing water to generate solid components such as floc and sludge, and precipitates and separates these solid components. The natural settlement processing facility 160 includes a mixing tank 161, a pH adjustment tank 162, and a solid-liquid separation device 163.

  The mixing tank 161 stores the primary cleaning water used for cleaning in the storage cleaning tank 120. Since the primary wash water stored in the mixing tank 161 in this way is wash water obtained by first washing the material to be treated that has been anodized, it becomes high-concentration wash water with a high metal component. In the mixing tank 161, calcium salt or aluminum salt as an auxiliary agent is added to the stored washing water. Thereby, an insoluble component or a heavy metal hydroxide is produced. The washing water to which the auxiliary agent is added in this way is transferred to the pH adjustment tank 162.

  The pH adjustment tank 162 is a water storage tank for controlling the pH value of the wash water transferred from the mixing tank 161. In the pH adjustment tank 162, an alkaline agent such as caustic soda is added to the stored washing water. Further, a flocculant for facilitating separation of solid components may be added to the pH adjusting tank 162. As described above, the water whose pH value is controlled in the pH adjusting tank 162 is transferred to the solid-liquid separation device 163 as reaction treated water.

  The solid-liquid separator 163 precipitates insoluble components or heavy metal hydroxides in the reaction treated water transferred from the pH adjusting tank 162. Thereby, reaction process water can be isolate | separated into supernatant water and sludge (sediment separation sludge). Then, the supernatant water is transferred to the MF membrane treatment device 171 and the sludge is transferred to the dehydration processing equipment 175. Thereby, the supernatant water in which the amount of the solid component is reduced can be transferred to the MF membrane treatment apparatus 171 and the addition to the MF membrane treatment apparatus 171 can be reduced.

  The MF membrane treatment device 171 is a filtration device for removing solid components that could not be separated by the solid-liquid separation device 163. The MF membrane treatment device 171 uses a membrane having a small membrane pore size (a hollow fiber membrane module having a nominal pore size of 0.02 μm made of polyvinylidene fluoride (PVDF)). Thereby, the MF film | membrane processing apparatus 171 can remove a solid component with high precision, and can reduce the load to a next process. The slurry (membrane separation concentrate) produced by the filtration treatment is transferred to the dehydration treatment equipment 175. On the other hand, the filtered water which is the supernatant water from which the solid component has been removed is transferred to the UV meter / activated carbon tower 172.

  Among the UV meter / activated carbon tower 172, the UV meter sterilizes and decomposes organic substances present in the filtered water transferred from the MF membrane treatment device 171. Thereby, the organic matter is converted into a shape that is easily adsorbed by the activated carbon tower. Then, organic substances are adsorbed in the activated carbon tower. In this way, the treated water on which the organic matter is adsorbed is transferred to an RO (Reverse Osmosis) device 173.

  The RO device 173 separates the treated water transferred from the UV meter / activated carbon tower 172 into a concentrated solution and a permeated water having a high salt concentration. The concentrated liquid is transferred to the reduced pressure processing device 176. On the other hand, the permeated water is transferred to the mixed bed ion exchanger 174.

  The mixed bed type ion exchange device 174 converts the permeated water desalted by the RO device 173 into pure water with high purity. High-purity pure water is transferred to and stored in the storage and washing tank 120 and used as reclaimed water.

  The dehydration processing equipment 175 dehydrates the sludge generated by the solid-liquid separator 163 and the slurry (membrane separation concentrate) generated by the MF membrane processor 171. Since the produced sludge contains harmful metal components, it is discarded, for example, as industrial waste.

  The decompression processing device 176 distills the concentrated liquid transferred from the RO device 173 in a decompressed state. The concentrated water having a high salt concentration is transferred to the crystallizer 177.

  The crystallizer 177 includes a disk that can be heated using water vapor as a heat source. When the concentrated water produced by the decompression processor 176 is applied to the heated disk, it evaporates and the sludge remaining on the disk surface is removed by a scraper. Since sludge contains harmful metal components, it is discarded, for example, as industrial waste.

  The primary washing water treatment facility 270 in the phosphoric acid boric acid surface treatment facility 200 and the primary washing water treatment facility 340 in the alkaline surface treatment facility 300 are the same as the primary washing water treatment facility 140 in the chromic acid surface treatment facility 100. Although the types and amounts of the chemicals to be added differ depending on the components contained in the cleaning water to be treated, the configuration itself shown in FIG. 2 is the same.

(Chromate ion exchange equipment 150)
FIG. 3 is a diagram showing a configuration of the chromate ion exchange facility 150. The chromic acid ion exchange facility 150 treats the secondary wash water transferred from the running water washing unit 130 as regenerated pure water, and returns the regenerated pure water to the running water washing unit 130. The chromate ion exchange facility 150 includes a wash water storage tank 151 for storing secondary wash water, a filter 152 for removing turbidity in the secondary wash water, and a chromic acid system for removing ions in the secondary wash water. An ion exchange tower 159, a pure water storage tank 156 for storing the generated pure water, a pressure pump 157 for feeding the pure water stored in the pure water storage tank 156 to the pressure tank 158, and a pressure pump 157 A pressurized tank 158 for storing the fed pure water in a high pressure state is provided.

  The cleaning water storage tank 151 is supplied not only with secondary cleaning water from the running water cleaning unit 130 but also with tap water from the water supply facility 180. By supplying tap water to the washing water storage tank 151, it is possible to suppress a reduction in circulating water circulated between the running water washing unit 130 and the chromic acid ion exchange facility 150. Moreover, deterioration of the quality of circulating water can be suppressed by chlorine contained in the supplied tap water.

  The filter 152 is a cartridge-type filter that can be attached to and detached from the filter, and removes turbidity contained in the water transferred from the washing water storage tank 151.

  The chromic acid ion exchange tower 159 includes a cation exchange tower 153 filled with a cation exchange resin, and an anion exchange tower 154 and an anion exchange tower 155 filled with an anion exchange resin. The chromic acid ion exchange tower 159 configured in this manner removes various ions in the water to produce pure water.

  The generated pure water is temporarily stored in the pure water storage tank 156. Then, it is sent to the running water washing unit 130 by the pressure pump 157 and the pressure tank 158. In this way, the secondary cleaning water used for cleaning the material to be treated in the flowing water cleaning unit 130 is made pure water by the chromic acid ion exchange facility 150 and returned to the flowing water cleaning unit 130 again.

(About phosphoric acid and boric acid ion exchange equipment 280)
FIG. 4 is a diagram showing a configuration of the phosphoric acid / boric acid ion exchange facility 280. The basic configuration of the phosphoric acid / boric acid ion exchange facility 280 is the same as that of the chromic acid ion exchange facility 150 described above. That is, the phosphoric acid / boric acid ion exchange facility 280 includes a washing water storage tank 281, a filter 282, a phosphoric acid boric acid ion exchange tower 289, a pure water storage tank 286, a pressure pump 287, A pressure tank 288. Tap water is supplied from the water supply facility 290 to the wash water storage tank 281. On the other hand, the configuration of the phosphoric acid borate ion exchange column 289 is different from the configuration of the chromic acid ion exchange column 159 described above.

  The phosphoric acid borate ion exchange tower 289 is filled with a cation exchange tower 283 filled with a cation exchange resin, an anion exchange tower 284 filled with an anion exchange resin, and a mixed cation exchange resin and an anion exchange resin. The mixed bed type exchange tower 285 is provided. With this configuration, phosphate ions are adsorbed by the anion exchange column 284, and borate ions are adsorbed by the mixed bed type exchange column 285. By the phosphoric acid borate ion exchange tower 289 configured in this way, various ions in the water are removed to produce pure water.

(About alkaline ion exchange equipment 350)
FIG. 5 is a diagram showing a configuration of the alkaline ion exchange facility 350. The basic configuration of the alkaline ion exchange facility 350 is the same as that of the chromic ion exchange facility 150 and the like described above. That is, the alkaline ion exchange facility 350 includes a washing water storage tank 351, a filter 352, an alkaline ion exchange tower 359, a pure water storage tank 356, a pressure pump 357, and a pressure tank 358. ing. The cleaning water storage tank 351 is supplied with tap water from the water supply facility 360. On the other hand, the configuration of the alkaline ion exchange tower 359 is different from the above-described configuration.

  The alkaline ion exchange tower 359 includes an activated carbon tower 353 filled with activated carbon, a cation exchange tower 354 filled with a cation exchange resin, and an anion exchange tower 355 filled with an anion exchange resin. Various ions in the water are removed by the alkaline ion exchange tower 359 configured in this way to generate pure water.

(About installation of the cleaning unit 230)
Unlike the chromic acid surface treatment facility 100 and the alkaline surface treatment facility 300, the phosphoric acid boric acid surface treatment facility 200 is a step of washing a material to be treated in the washing unit 230 as a pre-cleaning step of the storage washing tank 240. Is provided. The reason why the cleaning unit 230 is provided in this way is as follows.

When calcium salt (CaCl ₂ ) is added as an auxiliary agent in the mixing tank 161 (FIG. 2) in the primary wash water treatment facility 270 to treat wash water containing phosphoric acid, as shown in the following chemical formula 1, calcium phosphate (Ca ₃ (PO 4) ₂ ) and hydrochloric acid (HCl) are produced. The calcium phosphate (Ca ₃ (PO 4) ₂ ) thus generated is precipitated in the mixing tank 161.

As shown in the following chemical formula 2, when caustic soda (NaOH) is added in the pH adjusting tank 162 to adjust the pH of the washing water to which the calcium salt (CaCl ₂ ) transferred from the mixing tank 161 is added, sodium chloride (NaCl) is produced.

On the other hand, when aluminum salt (AlCl ₃ ) is added as an auxiliary agent in the mixing tank 161 in the primary wash water treatment facility 270 to treat the wash water containing phosphoric acid, as shown by the following chemical formula 3, Aluminum (AlPO4) and hydrochloric acid (HCl) are produced. The aluminum phosphate (AlPO 4) thus produced is precipitated in the mixing tank 161.

As shown in the following chemical formula 4, when caustic soda (NaOH) is added in the pH adjusting tank 162 to adjust the pH of the washing water to which the aluminum salt (AlCl ₃ ) transferred from the mixing tank 161 is added, sodium chloride (NaCl) is produced.

  Thus, when it is going to process the phosphoric acid contained in wash water, sodium chloride (NaCl) will be produced | generated and the salt concentration in process water will rise. Therefore, the load of the RO apparatus 173 for performing the desalting process provided in the subsequent process is applied, and there is a problem that the recovery rate of the reclaimed water is deteriorated. Such a problem also occurs when treating boric acid contained in the washing water. Therefore, in the present embodiment, a cleaning unit 230 for cleaning the material to be processed is provided in front of the storage cleaning tank 240 to wash away phosphoric acid or boric acid adhering to the material to be processed. Thereby, the density | concentration of the primary wash water transferred to the primary wash water treatment facility 270 can be reduced, and the load on the RO device 173 can be reduced.

(About the configuration of the washing water treatment facility 260)
FIG. 6 is a diagram illustrating a configuration of the cleaning water treatment facility 260. The cleaning water treatment facility 260 includes a cleaning water storage tank 261, a pH adjustment tank 262, and a crystallizer 263. As described above, in the cleaning unit 230, the amount of water sprayed from the shower nozzle (not shown) to the material to be processed is smaller than the water sprayed by the running water cleaning unit 250 (FIG. 1).

  The washing water storage tank 261 stores the high concentration washing water transferred from the washing unit 230. As described above, the cleaning water stored in the cleaning water storage tank 261 is cleaning water generated by first cleaning the anodized material to be processed with a small amount of water, and cleaning with high concentration of metal components. It becomes water. The cleaning water stored in the cleaning water storage tank 261 is transferred to the pH adjustment tank 262.

  The pH adjustment tank 262 is a water storage tank for controlling the pH value of the cleaning water transferred from the cleaning water storage tank 261. In the pH adjustment tank 262, an alkaline agent such as caustic soda is added to the stored washing water. Further, a flocculant for facilitating separation of solid components may be added to the pH adjusting tank 162. In this way, the water whose pH value is controlled in the pH adjusting tank 162 is transferred to the crystallizer 263.

  The crystallizer 263 includes a disk that can be heated using water vapor as a heat source. When the wastewater sent from the pH adjusting tank 262 is applied to the heated disk, it evaporates and sludge remaining on the disk surface is removed by a scraper. Since sludge contains harmful metal components, it is discarded, for example, as industrial waste.

  In this way, high-concentration wastewater generated by spraying water onto the material to be treated in the cleaning unit 230 is processed in the cleaning water treatment facility 260.

(Effects of the embodiment)
As described above, according to the embodiment of the present invention, there is provided a treatment facility for cleaning water for a material subjected to phosphoric acid-based surface treatment and cleaning water for a material subjected to boric acid-based surface treatment. Shared. Thereby, compared with the case where wastewater treatment equipment is provided separately, the cost of capital investment and the cost of maintenance can be suppressed. Further, the surface treatment facility can be made compact, and the installation space for the surface treatment facility can be reduced.

  In addition, before the cleaning by the storage cleaning tank 240, the processing material is cleaned with a small amount of water in the cleaning unit 230, and the generated high-concentration waste water is treated as a dry cake by the crystallizer, so that there is no drainage. Components that are difficult to process in the processing facility can be removed in advance from the material to be processed. Thereby, the waste water containing phosphoric acid and boric acid can be easily treated.

  Further, by performing cleaning in the cleaning unit 230, it is possible to suppress the concentration of phosphoric acid or boric acid in the primary cleaning water generated by cleaning the material to be processed in the storage cleaning tank 240. Thereby, the salt concentration which raises with the adjuvant inject | poured into primary wash water can be suppressed. As a result, the load on the RO device 173 in the primary wash water treatment facility 270 is reduced, and the recovery rate of recycled water can be improved. Furthermore, the load on the phosphoric acid borate ion exchange tower 289 is also reduced, and maintenance costs can be reduced.

  In addition, the phosphoric acid borate ion exchange tower 289 is arranged in the order of the cation exchange tower 283, the anion exchange tower 284, and the mixed bed type exchange tower 285, thereby efficiently adsorbing phosphate ions and borate ions. Can do.

  In addition, by supplying tap water to the wash water storage tank 151, it is possible to suppress a decrease in circulating water circulated between each of the running water cleaning units 130, 250, 330 and each of the ion exchange facilities 150, 280, 350. Can do. Moreover, deterioration of the quality of circulating water can be suppressed by chlorine contained in the supplied tap water.

(About other forms)
The present invention is not limited to the above embodiment, and various modifications and applications are possible. In the above-described embodiment, the cleaning unit 230 and the cleaning water treatment facility 260 are provided only in the phosphoric acid boric acid surface treatment facility 200, but the chromic acid surface treatment facility 100 may be provided with the same equipment, Similar equipment may be provided in the alkaline surface treatment equipment 300. Thereby, the load of the subsequent waste water treatment facility can be reduced.

  The surface treatment facility 1 includes the chromic acid surface treatment facility 100, the phosphoric acid boric acid surface treatment facility 200, and the alkaline surface treatment facility 300, but may further include other surface treatments. . For example, equipment for performing surface treatment with an oxalic acid aqueous solution as an electrolytic solution may be provided, or equipment for performing surface treatment with an aqueous sulfuric acid solution as an electrolytic solution may be provided. In addition to the phosphoric acid boric acid surface treatment facility 200, the surface treatment facility may include one surface treatment facility among the surface treatment facilities described above.

  Moreover, although aluminum was demonstrated to the example as a to-be-processed material which forms an oxide film with the surface treatment equipment 1, another metal may be sufficient. For example, the present invention can also be applied when an anodized film is formed on titanium or magnesium.

  Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Surface treatment equipment 100 ... Chromic acid type surface treatment equipment 200 ... Phosphoric acid boric acid type surface treatment equipment 210 ... Phosphoric acid type reaction tank 220 ... Boric acid type reaction tank 230 ...・ Cleaning unit 240 ... Reserved cleaning tank 250 ... Running water cleaning unit 260 ... Cleaning water treatment facility 261 ... Cleaning water storage tank 262 ... pH adjustment tank 263 ... Crystallizer 270 ...・ Primary wash water treatment equipment 280 ... Phosphoric acid / borate ion exchange equipment 281 ... wash water storage tank 282 ... filter 283 ... cation exchange tower 284 ... anion exchange tower 285 ... Mixed bed type exchange tower 286 ... Pure water storage tank 287 ... Pressure pump 288 ... Pressure tank 289 ... Phosphate borate ion exchange tower 290 ... Water supply equipment 300 ... Alkaline Surface treatment equipment

Claims (7)

A first reaction tank for forming an oxide film on the surface of the metal by the stored phosphoric acid aqueous solution;
A second reaction tank for forming an oxide film on the surface of the metal with the stored boric acid aqueous solution;
A third reaction tank that forms an oxide film on the surface of the metal with an aqueous solution different from the aqueous phosphoric acid solution and the aqueous boric acid solution stored;
A cleaning section for cleaning the metal on which an oxide film is formed by the first reaction tank, the second reaction tank, and the third reaction tank;
A wastewater treatment part for treating the wastewater discharged from the washing part,
The metal in which the oxide film is formed by the first reaction tank and the second reaction tank is washed by the common washing unit,
The metal having an oxide film formed by the third reaction tank is cleaned by the cleaning unit corresponding only to the third reaction tank.
Surface treatment equipment characterized by that. A plurality of the cleaning units provided in common in the first reaction tank and the second reaction tank are provided, and the metal on which the oxide film is formed is sequentially cleaned by the plurality of cleaning units provided,
The number of installed cleaning units provided in common in the first reaction tank and the second reaction tank is greater than the number of installed cleaning units corresponding only to the third reaction tank,
The surface treatment facility according to claim 1. Of the cleaning units provided in common in the first reaction tank and the second reaction tank, the cleaning water used in the first cleaning unit is more than the cleaning water used in the other cleaning units. Less is,
The surface treatment facility according to claim 1, wherein the surface treatment facility is provided. Of the cleaning units provided in common in the first reaction tank and the second reaction tank, the cleaning water used in the cleaning unit provided first is evaporated by the crystallizer. It is processed,
The surface treatment facility according to any one of claims 1 to 3, wherein the surface treatment facility is provided. The waste water treatment unit includes a storage tank that stores the waste water from the cleaning unit, an ion exchange tower for adsorbing ions contained in the waste water transferred from the storage tank, and a treatment generated by the ion exchange tower. Transporting means for transporting and circulating water to the washing section,
The storage tank is connected to a water supply facility for replenishing tap water.
The surface treatment facility according to any one of claims 1 to 4, wherein the surface treatment facility is provided. A first cleaning unit shared for cleaning a metal having an oxide film formed on the surface with an aqueous phosphoric acid solution and cleaning a metal having an oxide film formed on the surface by an aqueous boric acid solution;
A second cleaning unit for cleaning a metal having an oxide film formed on a surface thereof by using an aqueous solution different from the phosphoric acid aqueous solution and the boric acid aqueous solution;
A first wastewater treatment unit for treating wastewater discharged from the first cleaning unit;
A second wastewater treatment part for treating the wastewater discharged from the second cleaning part,
Wastewater treatment facility characterized by that. A metal having an oxide film formed on the surface with an aqueous phosphoric acid solution and a metal having an oxide film formed on the surface with an aqueous boric acid solution are washed in a common first cleaning section,
The metal having an oxide film formed on the surface by an aqueous solution different from the phosphoric acid aqueous solution and the boric acid aqueous solution is cleaned in a second cleaning unit different from the first cleaning unit
The waste water discharged from the first cleaning unit is treated in the first waste water treatment unit,
The waste water discharged from the second cleaning unit is treated in a second waste water treatment unit different from the first waste water treatment unit,
A wastewater treatment method characterized by that.

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