JPH10146508A - Waste water recycling device of car-washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water recycling device of a car-washing machine recycling washing water used in the washing of a car and supplying water again usable in car washing. SOLUTION: In an apparatus wherein an oil-water separation tank 1, a reaction tank 7 having upper and lower filter beds packed with a filter material arranged thereto over two stages so as to provide an interval between both filter beds and having air diffusing pipes connected to blower arranged under the respective upper and lower filter beds, a washing water tank 14 and a water supply tank 15 are connected in this order, a water passing valve 11 is disposed to the water passage 21 connecting the reaction tank 7 and the washing water tank 14 and a washing water drawing-out pipe 22 having a washing water drawing-out valve 10 is arranged to the lower part of the reaction tank separately from the water passage 21 and a nutrient tank 4 is connected to the reaction tank 7 on the upstream side thereof and a sterilizing device for the water in the washing water tank 14 is connected to or housed in the washing water tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recycling washing water used in a gas station, a coin washing area, or the like.

[0002]

2. Description of the Related Art In today's so-called car society, it has become a daily occurrence to wash a private car to keep it beautiful, and the work scene can be seen at a gas station or a coin washing area. . As is well known, a large amount of water is used for washing a car, and the washing water after washing contains oil (wax, etc.) and solids coming out of the car. It is often flushed to the sewer after performing.

[0003] Oil-water separation is a method in which washing water is temporarily stored in a large tank or the like, and only water collected in an intermediate portion of the tank is drained to sewage by utilizing the natural separation of oil, water, and solids. It is difficult to completely remove the oil, which increases the burden on public sewage treatment plants. In addition, companies that pay water bills want to reduce water bills by recycling water that has been used only once for car washing, which has become an important issue in recent years. The following technologies have been developed because they also lead to countermeasures.

That is, as shown in Japanese Utility Model Publication No. 4-44168, "Car Wash Drainage Purification Tank", a flocculation tank, a sedimentation tank, a screen, a screen sedimentation tank, a biological treatment tank, a nonwoven fabric filter, and a raw water tank and a storage tank at both ends thereof. The tank is arranged, and the various tanks described above are incorporated in a horizontal FRP purification tank and used.
Cleaning water is being purified. Other known methods include filtration using activated carbon, and filtration using a combination of a coagulant mixing tank and a filtration device.

[0005]

However, in the above-mentioned prior arts, there are problems in each of them, and the number of places where the present invention is practiced is small. In the method using a horizontal FRP purification tank, the number of processing steps is complicated, the filter is likely to be clogged, and the installation area is increased.
When activated carbon is used, although the water quality can be ensured by the adsorbing power of the activated carbon, a large running cost such as regeneration and replenishment of the activated carbon occurs. In the case of using a flocculant, only the physical and chemical treatments are performed, so that the treatment of organic substances is insufficient and the cause of generation of offensive odor is included.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a car washing machine drainage recycling apparatus which has a short processing step, uses no filters, reduces running costs, and does not generate odor. Aim.

[0007]

According to the present invention, as shown in FIG. 1, an oil-water separation tank 1 and a filter bed filled with a filter medium are vertically arranged.
An apparatus in which a reaction tank 7 provided with a space between the stages and an aeration tube connected to a blower below each of the upper and lower filter beds, a washing water tank 14, and a water supply tank 15 are connected in this order. A washing water drawing pipe provided with a water flowing valve 11 in a water passage 21 connecting the reaction tank 7 and the washing water tank 14, and having a washing water drawing valve 10 at a lower part of the reaction tank separately from the water passage 21. 22, a nutrient tank 4 is connected to the upstream side of the reaction tank 7, and a sterilizer for sterilizing the water in the washing tank 14 is connected to or provided inside the washing tank.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The oil / water separation tank 1 used in the present invention is used for removing oil and solids from washing water, and is not particularly limited as long as it can separate specific gravity. is not. When advanced treatment is desired, it is desirable to arrange a plurality of tanks and to sequentially transfer and separate the washing water stored in the intermediate portion of each tank. In particular, it is preferable to arrange and treat three or more tanks. Used.

The reaction tank 7 used in the present invention is vertically
In FIG. 1, the upper filter bed is referred to as a reaction unit 13 and the lower filter bed is referred to as a filter unit 12 in FIG. An air diffusion tube 8 is provided below the reaction unit 13 and an air washing tube 9 is provided below the filtration unit 12. The reaction unit 13 mainly performs biological treatment using oxygen in the air supplied from the air diffusion tube 8. And the filtration unit 12 mainly performs filtration.
The air cleaning pipe 9 is not normally operated, but is operated only when cleaning the filtration unit 12 described later.

As the filter medium to be filled in the filtration section 12 and the reaction section 13, open cells or closed cells of polyethylene, polystyrene, polypropylene or the like are preferably used, and the filling rate is to make the whole size compact. 75-8 for
Preferably it is 5%. As described above, since the biological treatment is performed in the reaction section 13, it is particularly preferable to use not only the synthetic resin product as described above but also a corrugated or string-shaped immobilized carrier as the filter medium.

As shown in FIG. 1, the nutrient tank 4 used in the present invention is connected midway to a pipe connecting the oil / water separation tank 1 and the reaction tank 7, or is connected directly to the reaction tank 7. The nutrient tank 4 is filled with a nutrient containing nitrogen and phosphorus necessary for smooth biological treatment in the reaction section 13 and is supplied to the reaction section 13. As a nutrient, a mixed solution of ammonium chloride and phosphoric acid, ammonium phosphate, or the like can be appropriately used.

The sterilizer used in the present invention is not particularly limited as long as it can sterilize washing water.
Various things are available. Specifically, a chlorine aqueous solution, an ozone generator, an ultraviolet generator, or the like can be used.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the washing water is supplied to an oil-water separation tank 1.
In, oil and solids are removed by passing through a tank partitioned into three tanks. The washing water flowing out of the oil / water separation tank 1 is supplied with and mixed with ammonium phosphate in the nutrient tank 4 by the nutrient supply pump 18 on the way, and flows into the upper portion of the reaction tank 7.

In the reaction tank 7, after the biological treatment in the reaction part 13, the solid matter generated during the biological treatment in the filtration part 12 is removed and the solid matter is transferred to the washing water tank 14 through the water passage 21. In the washing water tank 14, a sterilizing agent supply pump 20 supplies a chlorine aqueous solution from a sterilizing agent tank 19 in order to sterilize E. coli and the like in the washing water. The treated water that has undergone the purification and sterilization steps is stored in a water supply tank 15 and is supplied to necessary places as appropriate. At that time, the ball tap 1
By installing 6, it is also possible to supply automatically.

Since the above-mentioned filtration unit 12 is clogged when it is used continuously, it needs to be periodically cleaned. More specifically, the water level of the reaction tank 7 is lowered slightly by closing the water flow valve 11 and opening the cleaning water drawing valve 10. When the water level drops, the cleaning valve 6 is opened, and air is sent from the air cleaning pipe 9. While washing, all the washing water in the reaction tank 7 is pulled out. The reason for performing air cleaning after lowering the water level once is that if air is sent without lowering the water level, the water level in the reaction tank 7 may rise and overflow. Adjust appropriately according to the amount of air. After all the washing water in the reaction tank 7 is discharged, the washing water drawing valve 10 is closed, and the water flowing valve 11 is opened, whereby the washing water flows back from the washing water tank 14. After the reaction tank 7 is washed, the treated water does not flow into the water supply tank 15 until the reaction tank 7 and the washing water tank 14 are full, so that untreated washing water does not enter the water supply tank 15.

FIG. 2 shows an embodiment in which a sterilizer 23 for performing sterilization by ultraviolet rays is installed in the cleaning water tank 14 in place of the sterilizer tank 19 and the sterilizer supply pump 20 shown in FIG. The parts are the same as those in FIG.

[0017]

As described above, according to the present invention,
Because of the combination of biological treatment and filtration, the concentration of organic matter and suspended solids is low, the scale of the apparatus is small, and running costs can be kept low. Furthermore,
It is possible to provide safe recycled water free of generation of offensive odor and generation of pathogenic bacteria such as regiourela by sterilization.

[Brief description of the drawings]

FIG. 1 is a system diagram of an apparatus for recycling wastewater from a car washer according to an embodiment of the present invention.

FIG. 2 is a system diagram of a car wash wastewater recycling apparatus according to another embodiment of the present invention.

[Explanation of symbols]

1. Oil / water separation tank 2. Raw water pump 3. Blower 4. Nutrient tank 5 Aeration valve 6. Cleaning valve 7. Reaction tank 8. Diffuser tube 9. 9. Air washing tube (aeration tube) Wash water extraction valve 11. Water flow valve 12. Filtration unit (filter bed) 13. Reaction section (filter bed) 1
4. Washing tank 15. Water tank 16. Ball tap
17． Water supply pump 18. Nutrition supply pump 19. Sterilant tank 20.
Sterilant supply pump 21. Water passage 22. 23. Washing water extraction pipe Sterilizer

Claims (2)

[Claims] An oil / water separation tank, a reaction bed provided with a filter bed filled with a filter medium at two upper and lower stages with an interval, and an air diffuser connected to a blower below each of the upper and lower filter beds. A washing water tank and a water supply tank connected in this order, wherein a water passage valve is provided in a water passage connecting the reaction tank and the washing water tank, and a lower part of the reaction tank separately from the water passage. A washing water extraction pipe having a washing water extraction valve is installed, a nutrient solution tank is connected to the upstream side of the reaction tank, and a sterilizer for sterilizing the water in the washing water tank is connected to or provided inside the washing water tank. A car washer drainage recycling device. 2. An upper filter bed provided in upper and lower two stages is filled with a corrugated plate-like or string-like fixed carrier as a filter medium, and a synthetic resin open-cell foam is filled in a lower filter bed. The car washing machine drainage recycling apparatus according to claim 1, wherein the apparatus is filled with closed cells.