JP2003039091A - Method for recovering ice control agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recovering an ice control agent whereby the effluent containing a scattered ice control agent can be efficiently recovered; the recovered effluent is treated so as to reduce the content of the agent lower than the sewerage effluent standard or lower than the river effluent standard and then is discharged; and thus discharged effluent is subjected to an intermediate water treatment to make it recyclable as intermediate water. SOLUTION: In this recovering method, the effluent containing an ice control agent scattered at a parking area and/or a waiting area (including an apron and a taxiway) for the purpose of snow removal and ice control of an airplane is sucked and recovered by a vehicle. The recovered effluent is transferred to a lagoon treatment tank therein to be reserved and subjected to a treatment such as an aerobic or anaerobic treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering deicing agents, and more particularly to a method for recovering and treating deicing agents contained in wastewater produced by snow removal, deicing treatment of aircraft and the like.

[0002]

2. Description of the Related Art Since an aircraft flies in the atmosphere, if snow and ice adhere to the body during the flight, it freezes and interferes with the operation, causing an accident. Also, in cold regions, snow accumulates on the aircraft on land, and during takeoff or during flight, it may freeze, which may hinder maneuvering.

In order to prevent such obstacles, an aqueous solution containing an anti-icing agent made of a water-soluble organic compound such as ethylene glycol or propylene glycol is sprayed on the aircraft during maintenance of the aircraft or during standby for takeoff. Then, the snow and ice on the machine body are melted and removed, and at the same time, this deicing agent is attached to the machine body to prevent snow accumulation and freezing on the machine body surface.

[0004]

However, the wastewater generated when the deicing agent is sprayed is discharged to the surrounding area or rivers as it is like rainwater, and it is an organic compound deicing agent. There was a concern that the river discharge standards would be exceeded.

[0005] Particularly, as the demands of society for environmental protection have become strict as recently, how to prevent outflow to the public water area outside the airport and the surrounding area has become an urgent issue.

[0006] Therefore, an object of the present invention is to efficiently collect the wastewater of the deicing agent that has been sprayed, to treat the discharged deicing agent wastewater to a water quality that is less than the sewerage drainage standard or less than the river discharge standard, and then discharge. An object of the present invention is to provide a method for recovering deicing agents that can be reused as gray water by treating gray water.

[0007]

The above object of the present invention can be achieved by the following constitution. 1. Deicing agent recovery method to collect by a vehicle that sucks and collects deicing agent drainage used for snow removal and deicing of aircraft sprayed in parking areas and / or waiting areas (including aprons and taxiways) An anti-icing agent recovery method, characterized in that the recovered anti-icing agent wastewater is transferred to a lagoon processing tank and stored in the lagoon processing tank, and at the same time, treatment such as aerobic or anaerobic treatment is performed.

2. Snow removal of aircraft sprinkled in parking areas and / or waiting areas (including aprons and taxiways),
A deicing agent recovery method for collecting deicing agent drainage used for deicing treatment by a rainwater drainage pipe, wherein the collected deicing agent drainage is transferred to a lagoon treatment tank and stored in the lagoon treatment tank, and aerobic Alternatively, a method for recovering an anti-icing agent is characterized by performing a treatment such as an anaerobic treatment.

3. The rainwater drainage pipe is provided with a switching valve between a route for transferring the deicing agent drainage collected at the time of spraying the deicing agent to the lagoon treatment tank and a route for discharging the rainwater to the outside of the airport. 2. The anti-icing agent recovery method as described in 2.

4. Snow removal of aircraft sprinkled in parking areas and / or waiting areas (including aprons and taxiways),
A deicing agent recovery method for collecting deicing agent drainage used for anti-icing treatment, comprising arranging a drainage groove and a drainage pipe in the outer periphery or area of the area where the deicing agent is sprayed, A method for recovering deicing agent, comprising collecting deicing agent drainage from a drainage pipe, transferring the collected deicing agent drainage to a lagoon treatment tank for storage, and performing treatment such as aerobic or anaerobic treatment.

5. The drain groove and the drain pipe are provided with a switching valve between a route for transferring the deicing agent drainage collected during spraying of the deicing agent to the lagoon treatment tank and a route for discharging rainwater to the outside of the airport. 4. The method for recovering deicing agents according to 4 above.

6. A temporary storage tank is provided in the vicinity of a parking area and / or a waiting area (including an apron and a taxiway) for collecting the deicing agent drainage, and after temporarily collecting the deicing agent drainage collected in the temporary storage tank, The method for recovering deicing agents according to the above 1, 2 or 4, wherein the method is to transfer to a lagoon treatment tank.

7. A method for recovering deicing agents, wherein the temporary storage tank described in 6 above can be used as a lagoon processing tank.

8. Any of the above 1 to 5, characterized in that when the water quality of the deicing agent drainage stored in the lagoon treatment tank and subjected to treatment such as aerobic or anaerobic treatment meets the sewer drainage standards, it is drained to the sewer facility. A method for recovering an anti-icing agent as described in.

9. When the water quality of the deicing agent drainage stored in the lagoon treatment tank and subjected to aerobic or anaerobic treatment etc. is less than the specified value that can be used as tap water, it is passed to the tap water facility and used as tap water. 1 to 5 characterized in that
The method for recovering deicing agent according to any one of 1.

10. If the quality of the deicing agent drainage stored in the lagoon treatment tank and subjected to aerobic or anaerobic treatment etc. does not meet the sewer drainage standards, the treated deicing agent drainage is stored in the abatement facility of the airport facility. The treated water is transferred to a treatment facility, the treatment facility includes at least one of the following treatment methods (1) to (4), and the quality of the deicing agent drainage water is treated to be less than the sewerage drainage standard. 6. The deicing agent recovery method according to any one of 1 to 5 above, wherein the water is drained to a sewer facility. (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment

11. If the water quality of the deicing agent drainage stored in the lagoon treatment tank and subjected to aerobic or anaerobic treatment does not fall below the specified value that can be used as tap water, the treated deicing agent drainage is stored in the airport facility. The treatment equipment of the abatement facility is subjected to a treatment including at least one of the treatment methods (1) to (4) below, and then transferred to the water treatment facility. Characterized in that the water quality of the deicing agent drainage is treated in a water production facility to a predetermined value or less that can be used as gray water, and the treated water is passed to a tap water facility for use as gray water. The method for recovering deicing agent according to any one of 1 to 5. (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment

12. The above 1 characterized in that the deicing agent wastewater is treated when the capacity of the detoxification facility in the airport facility is surplus.
The method for recovering deicing agent according to 0 or 11.

13. 12. The deicing agent recovery method according to any one of 1 to 11 above, wherein the lagoon treatment tank is a renovation of an existing underground facility such as a tunnel that has become unnecessary.

14. 1 to 11 above, wherein the lagoon treatment tank is a facility newly installed on the airport premises
The method for recovering deicing agent according to any one of 1.

15. The deicing agent drainage that has flowed into the water retention pond adjacent to the airport facility without being recovered by the above-mentioned 1, 2 or 4 is transferred to the treatment facility of the rainwater purification facility, and the treatment facility below (1) to (4) The method for recovering anti-icing agent according to claim 1, wherein the water quality of the deicing agent wastewater is treated according to the river discharge standard, and the treated water is discharged into the river. (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment

16. The deicing agent drainage that has flowed into the water retention pond adjacent to the airport facility without being recovered by the above-mentioned 1, 2 or 4 is transferred to the treatment facility of the rainwater purification facility, and the treatment facility below (1) to (4) The water quality of the deicing agent drainage is treated to a predetermined value or less that can be used as gray water by a treatment including at least one of the above treatment methods, and the treated water thus treated is used as gray water. Deicing agent recovery method. (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment

17. 17. The deicing agent recovery method as described in 15 or 16 above, further comprising a sluice gate for controlling the outflow of the deicing agent drainage flowing into the holding pond into the river.

18. The anti-icing ice as described in 9, 11, or 16 above, characterized in that the anti-icing agent drainage treated to a predetermined value or less that can be used as intermediate water is used as miscellaneous water such as makeup water for cooling and heating and wash water for toilets. Agent recovery method.

19. 19. The method for recovering deicing agents as described in 18 above, wherein an existing common groove is used as a water supply route for the water supply system.

20. In the non-deicing agent non-recovery period, the lagoon treatment tank is used as a rainwater storage layer, and the above 1
To 6, 8 to 11, 13, and 14, the anti-icing agent recovery method.

21. 8. The anti-icing agent recovery method according to the above 7, wherein the temporary storage tank is used as a rainwater storage layer during the deicing agent non-collecting period.

22. 22. A deicing agent collecting method, wherein various facilities / equipment, etc. used in the deicing agent collecting method according to any one of 1 to 21 above are diverted / combined as other facilities / equipment, etc.

[0029]

DETAILED DESCRIPTION OF THE INVENTION The details of the present invention will be described below. FIG. 1 is a schematic plan view showing an example of an airport to which the deicing agent recovery method of the present invention is applied.

The present invention collects the deicing agent drainage used for snow removal and deicing treatment of aircraft sprayed in the parking area and / or the waiting area, and transfers the collected deicing agent drainage to the lagoon treatment tank. Is stored in the lagoon treatment tank and is subjected to aerobic or anaerobic treatment and the like.

In the present specification, the parking area and / or the waiting area mean all areas in which an aircraft passes or parks, and includes an apron and a taxiway.

First, in the first aspect of the present invention according to claim 1,
It is collected by the vehicle that suctions and collects the deicing agent drainage.
As a vehicle for sucking and collecting the deicing agent drainage, a vehicle that has been used in this kind of work can be used. Vehicles that collect deicing agent drainage by suction can be used for other purposes, such as road cleaning vehicles, transport vehicles, and patrol vehicles, by installing other equipment when the deicing agent is not sprayed. Alternatively, it is preferable that they can be used together.

The deicing agent drainage collected by the vehicle for sucking and collecting the deicing agent drainage is transferred to the lagoon treatment tank and stored in the lagoon treatment tank.

The stored anti-icing agent waste water is subjected to treatment such as aerobic or anaerobic treatment. The aerobic treatment means decomposing organic substances by utilizing the metabolic action of aerobic microorganisms in an aerobic environment in which oxygen exists, and various known aerobic treatments can be adopted. Anaerobic treatment means decomposing organic substances by utilizing the metabolic action of anaerobic microorganisms in an anaerobic environment where dissolved oxygen does not exist.

The lagoon treatment tank may be newly installed as a new facility on the airport premises, but if the existing underground facility such as a tunnel that has become unnecessary is refurbished and converted, the construction period can be shortened. It is preferable because it reduces the cost.

Further, the lagoon treatment tank is preferably used as a rainwater reservoir during the period when the anti-icing agent is not collected, that is, the season (spring to autumn) when the anti-icing agent is not sprayed.

Further, among the lagoon treatment tanks, the lagoon treatment tank which becomes an underground structure has a low natural ventilation capacity, and therefore it is preferable to provide ventilation equipment.

Further, in the present invention, in addition to the above-mentioned recovery by the vehicle for sucking and recovering the deicing agent drainage, the parking area and / or the waiting area (including the apron and the taxiway) may be provided as described in claim 2. It can be collected by the rainwater drainage pipe that is installed.

During the course of the rainwater drainage pipe, when the deicing agent is sprayed, the deicing agent drainage collected is transferred to the lagoon treatment tank,
A switch valve will be installed between the route for transferring the deicing agent drainage to the lagoon treatment tank and the route for discharging rainwater to the outside of the airport so that the rainwater will be discharged to the outside of the airport in rainy weather other than spraying. There are various types of switching valves such as sluice valve (gate valve), butterfly valve, flat bottom valve (flat valve), water control door (slide gate), etc. Door (slide gate)
Is preferable because the construction is the simplest and the construction cost is low. Further, it is preferable in terms of operation and safety that the switching of the switching valve can be operated by remote control.

Further, in the present invention, as described in claim 4,
Drainage channels and drainage pipes are installed in the area where the deicing agent is sprayed, that is, the outer periphery or area of the parking area and / or the standby area (including the apron and taxiway). The deicing agent drainage can be collected.

When a drainage channel and a drainage pipe are provided, rainwater naturally flows in during rainy weather other than the time when the deicing agent is sprayed. The drain pipe will be equipped with a switching valve between the route for transferring the deicing agent drainage collected during spraying of the deicing agent to the lagoon treatment tank and the route for discharging rainwater outside the airport.
As the switching valve, the same one as the one provided in the route of the rainwater drainage pipe can be used.

In the present invention, in addition to transferring the deicing agent drainage collected by the above three methods to the lagoon treatment tank, a parking area and / or a waiting area (apron and taxiway for collecting the deicing agent drainage) It is also possible to dispose a temporary storage tank in the vicinity of (including) and temporarily store the deicing agent drainage collected in the temporary storage tank, and then transfer it to the lagoon processing tank. For example, when the number and / or capacity of lagoon treatment tanks is insufficient at some mid-stage of facility planning, it is preferable to provide a temporary storage tank near an area far from the lagoon treatment tanks already deployed. A lagoon treatment function may be added to the temporary storage tank, or the temporary storage tank may be a permanent lagoon processing tank instead of a temporary storage tank.

As described above, it is stored in the lagoon treatment tank,
When the quality of the deicing agent wastewater that has undergone aerobic or anaerobic treatment meets the sewer drainage standard, the treated deicing agent drainage can be discharged to a sewer facility.

When the water quality of the deicing agent wastewater treated in the lagoon treatment tank is lower than a predetermined value that can be used as tap water, it is passed to the tap water facility and can be used as tap water. Become.

Examples of the use destination of the intermediate water include miscellaneous water such as makeup water for cooling and heating and wash water for toilet. When used as tap water, it is preferable to use an existing common trench as the water supply route for the tap water in the airport facility, because the use of this will eliminate the need for construction of a new dedicated trench.

If the quality of the deicing agent drainage does not meet the sewerage drainage standard even if the deicing agent drainage is treated in the above-mentioned lagoon treatment tank, the treated deicing agent drainage according to the present invention may be treated as an airport facility. Transferred to the treatment facility of the abatement facility inside
A treatment including at least one of the following treatment methods (1) to (4) is performed in the treatment facility, and the water quality of the deicing agent drainage is treated to be less than or equal to the sewer drainage standard. Treated water that has been treated to below the sewer drainage standard by such treatment is discharged to the sewer facility.

If the water quality of the deicing agent drainage does not fall below a predetermined value that can be used as intermediate water even after the treatment in the lagoon treatment tank described above, in the present invention as set forth in claim 11, the treatment is completed. The deicing agent drainage water is transferred to the treatment facility of the detoxification facility in the airport facility, and the treatment facility uses the following (1)-
After performing the treatment including at least one of the treatment methods of (4), it is further transferred to the intermediate water production facility, and the water quality of the deicing agent drainage is less than a predetermined value that can be used as intermediate water in the intermediate water production facility. To process. By such a treatment, the treated water that has been treated to a level not higher than the predetermined value that can be used as gray water is passed to the tap water facility and can be used as gray water.

The treatment methods include, for example, four treatments (1) biological treatment, (2) reverse osmosis membrane treatment, (3) oxidizing agent treatment, and (4) activated carbon adsorption treatment.

(1) Biological treatment is a treatment method in which, as shown in the schematic diagram of FIG. 2, organic matter is decomposed in the deicing agent wastewater by utilizing the metabolic action of microorganisms and the like.

(2) Reverse osmosis membrane treatment is a method of treating by passing through a reverse osmosis membrane as shown in the schematic view of FIG.

(3) Oxidizing agent treatment means, as shown in the schematic view of FIG. 4, that the deicing agent is decomposed by using the oxidizing agent, and then the oxidizing agent and the product are aggregated / precipitated by the aggregating agent. It is a method of processing by. FIG. 5 shows a processing system flow chart in the case of (3) oxidizing agent processing.

(4) The activated carbon adsorption treatment is a method of literally adsorbing an anti-icing agent with activated carbon for treatment.

Although FIGS. 2 to 5 show a mode in which the deicing agent drainage is stored in the storage tank as claimed in claim 16, the storage tank is referred to as a "lagoon treatment tank". The present invention can be applied to claims 10 and 11 by replacing them.
In the case of applying to claims 10 and 11, these treatments are carried out in a treatment facility and a gray water production facility installed in the abatement facility in the airport facility.

The detoxification facility is a conventional existing airport facility, but by effectively utilizing the excess capacity of the detoxification facility, the deicing agent drainage can be treated. Further, depending on the capacity of the lagoon treatment tank, it is possible to perform treatment for a long period of time during the season (spring to autumn) when the deicing agent is not sprayed. In the case of treatment for a long period of time, it is not necessary to increase the treatment capacity of the treatment facility of the abatement facility and the intermediate water production facility, which is preferable.

Although the embodiment of the deicing agent collecting method according to the present invention has been described above, there is a possibility that the deicing agent drainage may not be completely collected even by the above-mentioned modification.

For example, in the case of recovery by a vehicle that sucks and collects the deicing agent drainage, if the deicing agent drainage that could not be completely collected due to the leakage of the moving route of the vehicle remains on the road surface in the area, it flows out. The possibility is great.

In such a case, if the existing rainwater drainage pipe is passed through the water reservoir, it will flow into the water reservoir.

Therefore, assuming such a case in advance, a flood control gate for controlling the outflow of the deicing agent drainage to the river is provided in the aquifer to keep the stored water in the aquifer and the deicing agent drainage treated water. Divide into categories so that they can be released, treated, and used as raw water.

By arranging the flood control gate in the water retention pond, as described in claim 15, the deicing agent drainage flowing into the water retention pond is transferred to the treatment equipment of the rainwater purification facility near the water retention pond, and the treatment equipment is used. By the treatment including at least one of the treatment methods (1) to (4), the water quality of the deicing agent wastewater is treated to be equal to or lower than the river discharge standard. By this treatment, the treated water treated to below the river discharge standard is discharged to the river.

Further, as described in claim 16, the deicing agent drainage that has flowed into the holding pond is transferred to the treatment facility of the rainwater purification facility, and the treatment facility of the above (1) to (4) is used. By the treatment including at least one method, the water quality of the deicing agent drainage is treated to a predetermined value or less that can be used as tap water. By this treatment, the treated water that has been treated to a value equal to or lower than the predetermined value that can be used as the gray water is used as the gray water.

The above-mentioned deicing agent recovery method of the present invention is as shown in the flow chart of FIG.

In the above-described method for recovering deicing agent according to the present invention, it can be used as a rainwater storage layer in seasons other than winter, that is, in the non-deicing agent non-collecting period in which drainage of the deicing agent is not stored. . Other facilities / equipment used for other anti-icing agent recovery methods will also be diverted to other facilities / equipment.
It is preferable that they are also used.

[0063]

EFFECTS OF THE INVENTION According to the present invention, the wastewater of the deicing agent sprayed can be efficiently collected. The collected anti-icing agent drainage can be processed and discharged to a level below the sewer drainage standard or to a river discharge standard, or treated to a level below the level that can be used as gray water and reused as gray water. .

In addition, the treatment can be carried out in the treatment facility of the abatement facility in the airport facility and the treatment facility of the intermediate water production facility or the rainwater purification facility near the water reservoir.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of an airport to which the deicing agent recovery method of the present invention is applied.

FIG. 2 is a schematic diagram illustrating biological treatment, which is one of the methods for treating deicing agent wastewater.

FIG. 3 is a schematic diagram illustrating reverse osmosis membrane treatment, which is one of the methods for treating deicing agent wastewater.

FIG. 4 is a schematic diagram illustrating an oxidant treatment, which is one of the methods for treating deicing agent wastewater.

FIG. 5 is a treatment system flow chart in the case of an oxidizer treatment, which is one of the methods for treating deicing agent wastewater.

FIG. 6 is a flow chart showing an embodiment of the method for recovering deicing agent of the present invention.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/72 C02F 1/72 Z 3/12 3/12 V (72) Inventor Fumio Ogawa Narita City, Chiba Prefecture No. 24, Kamidai, the root of the tree Shin-Tokyo International Airport Public Corporation (72) Inventor, Seiichi Saito, No. 24, Shindai, the tree root of New Tokyo International Airport, Toshio Tashiro, Narita, Narita, Chiba Prefecture No. 24 New Tokyo International Airport Public Corporation (72) Inventor Issei Kikuchi 6 Yonban-cho, Chiyoda-ku, Tokyo 6 Japan Environmental Giken Co., Ltd. (72) Inventor Tetsushi Yoshimoto 6 Yonban-cho, Chiyoda-ku, Tokyo 6 Japan Environmental Giken Co., Ltd. In-company (72) Inventor, Takanobu Yonemura 6 Yonban-cho, Chiyoda-ku, Tokyo Japan Environmental Technology Research Institute F-term in in-company (reference) 4D006 GA03 KA01 KB22 KB23 PB08 PC80 4D024 AA04 AB04 BA02 DB15 DB 16 4D028 BC19 BD17 4D040 BB01 BB51 4D050 AA12 AB13 BB20 CA17

Claims (22)

[Claims] Claims: 1. Pest control to be collected by a vehicle that sucks and collects deicing agent drainage used for snow removal and deicing treatment of aircraft sprayed in parking areas and / or waiting areas (including aprons and taxiways) An anti-icing agent recovery method, characterized in that the recovered anti-icing agent wastewater is transferred to a lagoon treatment tank and stored in the lagoon processing tank, and at the same time, treatment such as aerobic or anaerobic treatment is performed. Method. 2. An anti-icing agent recovery in which rainwater drainage pipe collects the anti-icing agent drainage used for snow removal and deicing treatment of aircraft sprayed in the parking area and / or the waiting area (including an apron and taxiway) A method for recovering an anti-icing agent, which is characterized in that the recovered anti-icing agent wastewater is transferred to a lagoon processing tank and stored in the lagoon processing tank, and at the same time, a treatment such as aerobic or anaerobic treatment is performed. 3. The rainwater drainage pipe is provided with a switching valve between a route for transferring the deicing agent drainage collected during spraying of the deicing agent to a lagoon treatment tank and a route for discharging rainwater to the outside of the airport. The method for recovering an anti-icing agent according to claim 2, wherein 4. A deicing agent recovery method for collecting deicing agent drainage used for snow removal and deicing treatment of an aircraft sprayed in a parking area and / or a waiting area (including an apron and taxiway). , A drainage groove and a drain pipe are provided in the outer periphery of the area where the deicing agent is sprayed or in the area area, the deicing agent drainage is collected from the drainage groove and the drainage pipe, and the collected deicing agent drainage is stored in the lagoon treatment tank. A method for recovering anti-icing agents, which comprises transferring to and storing the same in an aerobic or anaerobic manner. 5. The drainage channel and drainage pipe are provided with a switching valve between a route for transferring deicing agent drainage collected during spraying of the deicing agent to a lagoon treatment tank and a route for discharging rainwater to the outside of the airport. The anti-icing agent recovery method according to claim 4, wherein 6. A parking area for collecting deicing agent drainage and / or
Alternatively, a temporary storage tank is provided near the standby area (including an apron and a taxiway), and the deicing agent drainage collected in the temporary storage tank is temporarily stored and then transferred to the lagoon processing tank. Item 5. The anti-icing agent recovery method according to Item 1, 2 or 4. 7. A method of recovering anti-icing agents, wherein the temporary storage tank according to claim 6 can be used as a lagoon processing tank. 8. The deicing agent drainage stored in a lagoon treatment tank and subjected to aerobic or anaerobic treatment is discharged to a sewer facility if the quality of the deicing agent drainage meets the sewer drainage standard. Item 7. A method for recovering deicing agent according to any one of Items 1 to 5. 9. When the quality of the deicing agent drainage water stored in a lagoon treatment tank and subjected to treatment such as aerobic or anaerobic treatment is equal to or lower than a predetermined value that can be used as tap water, water is passed to a water supply facility. , It is used as intermediate water.
The method for recovering deicing agent according to any one of 1. 10. When the water quality of the deicing agent drainage stored in a lagoon treatment tank and subjected to aerobic or anaerobic treatment does not meet the sewer drainage standard, the treated deicing agent drainage is stored in the airport facility. The water quality of the deicing agent drainage is treated to the sewerage drainage standard or lower by a treatment including at least one of the following treatment methods (1) to (4) in the treatment equipment of the detoxification facility, The method for recovering deicing agents according to any one of claims 1 to 5, wherein the treated water thus treated is discharged to a sewer facility. (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment 11. A deicing agent that has been treated in the case where the quality of the deicing agent drainage stored in a lagoon treatment tank and subjected to aerobic or anaerobic treatment does not fall below a predetermined value that can be used as tap water. After transferring the wastewater to the treatment facility of the abatement facility in the airport facility, and performing the treatment including at least one of the treatment methods of the following (1) to (4) in the treatment facility, the wastewater production facility is further processed. Transferring and treating the water quality of the deicing agent wastewater to a predetermined value or less that can be used as gray water in the gray water manufacturing facility, and passing the treated water to the tap water facility for use as gray water. The method for recovering an anti-icing agent according to any one of claims 1 to 5, characterized in that: (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment 12. The deicing agent drainage is treated when the detoxification facility in the airport facility is over capacity.
Alternatively, the method for recovering deicing agent according to item 11. 13. The method for recovering deicing agents according to claim 1, wherein the lagoon treatment tank is a renovation of an existing underground facility such as an unnecessary tunnel. 14. The deicing agent recovery method according to claim 1, wherein the lagoon treatment tank is a facility newly installed on the airport premises. 15. Deicing agent drainage that has not been recovered by the recovery according to claim 1, 2 or 4 and has flowed into a holding pond adjacent to an airport facility is transferred to a treatment facility of a rainwater purification facility, and the treatment facility A control method comprising treating at least one of the treatment methods of (1) to (4) to treat the water quality of the deicing agent effluent according to a river discharge standard, and discharging the treated water into the river. How to collect ice-cream. (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment 16. The anti-icing agent drainage that has flowed into a holding pond adjacent to an airport facility without being recovered by the recovery of claim 1, 2 or 4 is transferred to a treatment facility of a rainwater purification facility, and the treatment facility By the treatment including at least one of the treatment methods of (1) to (4), the water quality of the deicing agent wastewater is treated to a predetermined value or less that can be used as gray water, and the treated water is used as gray water. A method for recovering an anti-icing agent, which comprises: (1) Biological treatment (2) Reverse osmosis membrane treatment (3) Oxidizing agent treatment (4) Activated carbon adsorption treatment 17. The anti-icing agent recovery method according to claim 15 or 16, further comprising a sluice gate for controlling the outflow of the deicing agent drainage flowing into the holding pond into the river. 18. The anti-icing agent drainage treated to a predetermined value or less that can be used as gray water is used as miscellaneous water such as make-up water for cooling and heating and wash water for toilets.
The method for recovering an anti-icing agent as described in 11 or 16. 19. The method for recovering deicing agents according to claim 18, wherein an existing common groove is used as a water supply route for the tap water. 20. The lagoon treatment tank is used as a rainwater reservoir during the non-deicing agent non-recovery period.
The method for recovering deicing agent according to any one of 6, 8 to 11, 13, and 14. 21. The method for recovering deicing agents according to claim 7, wherein the temporary storage tank is used as a rainwater storage layer during the non-deicing agent non-collecting period. 22. Deicing ice characterized in that various facilities / equipment used in the method for recovering deicing agent according to any one of claims 1 to 21 are diverted / combined as other facilities / equipment, etc. Agent recovery method.