JPH11169878A - Waste water recycling treatment apparatus for car washing machine and method for preventing freezing of its piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water recycling treatment apparatus for a car washing machine which shortens a work period for installation by decreasing the amt. of installation work and a method for preventing the freezing of piping in winter or cold season utilizing this treatment apparatus. SOLUTION: The waste water recycling treatment apparatus for the car washing machine having a separating vessel 1 for separating oil and solid, a treating vessel 7 for treating the waste water to purify and a water feeding vessel 15 for feeding water to the car washing machine is provided with bypass connecting and liquid feeding means 2 between the water feeding vessel 15 and the separating vessel 1 in such a manner that the treated water treated in the treating vessel may be continuously or intermittently circulated in order of the respective vessels; the water feeding vessel 15, the separating vessel 1 and the treating vessel 7 (after which the water returns again to the water feeding vessel) except during working of the car washing machine. The freezing of the piping of the waste water recycling treatment apparatus for the car washing machine is prevented by using such apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater recycling apparatus for a car washer used in a gas station or a coin washing area, and a method for preventing freezing of a pipe thereof.

[0002]

2. Description of the Related Art FIG. 2 shows the structure, connection and flow of a conventional waste water recycling apparatus for a car washer. As shown in FIG. 2, a conventional wastewater recycle treatment device for a car washer includes, in addition to a separation tank, a biological treatment tank and a water supply tank, a water channel / pipe between the car wash machine and the separation tank, and a separation tank and a biological treatment tank. Waterways / piping,
It is composed of waterways and pipes between the biological treatment tank and the water supply tank, waterways and pipes between the water supply tank and the car washer, and these additional facilities.

[0003] Car wash drainage is first stored in a separation tank to separate and remove oils and solids, and then subjected to biological purification treatment, and the treated water is recycled into car wash water. At this time, each time the level switch in the separation tank is energized (switched on), the drainage (raw water) pump operates to transfer the wastewater to the biological purification tank, and the transferred wastewater is purified in the biological purification tank. The treated water is stored in a water supply tank and used in a car washer together with fresh water such as tap water. When the level switch is de-energized (switch off), the flow of liquid stops when the drainage (raw water) pump stops, and when the outside temperature drops in winter, the inside of the piping freezes. To prevent freezing,
Usually, a heater having a thermoswitch that operates at a temperature is attached to the freezing portion or the entire processing apparatus, or a heat insulating material or the like is wrapped around the heater.

[0004]

However, the above-mentioned method increases the amount of work required to install the apparatus, and causes inconveniences such as an extension of the work period. It also increases the price of wastewater recycling equipment. SUMMARY OF THE INVENTION It is an object of the present invention to provide an economical wastewater recycling treatment device for a car washer which does not cause such inconvenience, and to provide a method for preventing freezing of piping in winter using the treatment device.

[0005]

SUMMARY OF THE INVENTION The present invention firstly provides a separation tank for storing wastewater discharged from a car washer to remove oil and solids, and purifying the wastewater from which the oil and solids have been removed. A wastewater recycle treatment device for a car washer comprising a treatment tank and a water supply tank for supplying water to the car wash machine, wherein the treated water treated in the treatment tank except when the car wash machine is operating is supplied to a water supply tank, a separation tank, a treatment tank ( After that, returning to the water supply tank again), a drainage for a car washer provided with a bypass connection and a liquid feeding means between the water supply tank and the separation tank so that the tanks can be continuously or intermittently circulated in order. It is a recycling processing device.

[0006] Secondly, the present invention secondly stores wastewater discharged from a car washer in a separation tank to separate and remove oil and solid, and transfers it to a treatment tank for purification treatment. When stored in a water tank and recycled for car washing, a bypass connection and a liquid sending means are provided between the water tank and the separation tank, and the treated water treated in the treatment tank except when the car washer is in operation, a water tank, The present invention relates to a method for preventing freezing of pipes of a wastewater recycle treatment device for a car washer, which circulates continuously or intermittently in order of each of a separating tank and a processing tank (then, returning to a water supply tank again) in order. .

FIG. 1 shows the construction, connection and flow of a liquid (schematic diagram) of a car washer and a waste water recycling apparatus of the present invention. The wastewater recycling treatment apparatus of the present invention includes a separation tank, a treatment tank and a water supply tank, a waterway and piping between the car washer and the separation tank, a waterway and piping between the separation tank and the treatment tank, and a waterway and piping between the treatment tank and the water supply tank. ,
It is composed of a water channel / pipe between the water tank and the car washer, and a water channel / pipe (bypass connection) between the water tank and the separation tank and a liquid feeding means provided during the bypass connection. The water supply means provided in the water channel / pipe (bypass connection) between the water supply tank and the separation tank and the bypass connection supplies treated water treated in the treatment tank except when the car washer is operating, to the water supply tank, the separation tank, and the treatment tank. (After that, return to the water tank again.) Continuous or intermittent circulation in order to prevent freezing of waterways and pipes in winter.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 3 shows an example of the waste water recycling apparatus for a car washer according to the present invention, and FIG.
Are shown below. In general, car wash drainage containing detergent, wax, mud, and the like used in the car wash machine flows into the separation tank 1 through the car wash machine drain. The inflowed wastewater is supplied from a wastewater inlet provided in the separation tank to a treatment tank (consisting of a biological treatment tank 7 and a washing water tank 14), and is subjected to biological purification and sterilization. enter. Car wash water in the water tank is supplied to the car washer according to the amount of water required for car wash.
If the water tank overflows, the overflow flows into the first chamber of the separation tank or into the car washer drain.

The separation tank 1 in the wastewater recycling apparatus for a car washer according to the present invention is a tank for storing the washing wastewater from the car washer and removing oil and solid components with a specific gravity difference. Since the recyclable wastewater exists in the middle of the storage liquid, a plurality of separation chambers are provided, and the wastewater existing in the middle of the storage liquid in the separation chamber is transferred to the next separation chamber in order to reduce the oil content and the solid content. Wastewater that does not contain can be obtained. The number of separation tanks is preferably three or more.

[0010] A level switch can be attached to the separation tank 1 so as to detect the amount of inflow water. The drain (raw water) pump 2 is turned on by the ON / OFF of the level switch
-Is turned off. Drain when the water level reaches a certain level (raw water)
Drain (raw water) when the pump operates and drops to a certain water level
Pump stops. The OFF point of the level switch is preferably set to a water level at which bubbles do not enter the drainage (raw water) pump. Further, it is preferable that the difference between the water levels at the ON-OFF points is as narrow as possible. In addition, the suction port of the drainage (raw water) pump is provided at a position near the bottom in the separation tank.

[0011] The treatment tank in the wastewater recycling treatment apparatus is composed of a biological treatment tank provided with a nutrient source tank and a washing water tank provided with a sterilizer. The biological treatment tank and the washing water tank form a water passage at a lower portion. Connected through.

A nutrient source (nitrogen, phosphorus) for promoting biological treatment is supplied from the nutrient source tank 4 to the biological treatment tank 7 by a nutrient source supply pump 18, and a sterilizing agent for sterilizing treated water (from a sterilizing agent tank 19). Chlorine and the like are supplied to the cleaning water tank 14 by the sterilant supply pump 20. Instead of a sterilant, a sterilizer such as an ozone generator or an ultraviolet generator can be used.

The biological treatment tank 7 includes an upper biological treatment filter bed 1.
3 and a lower filter bed 12 for filtration, each of which is filled with a dice-like communicating foam. Filter bed for biological treatment 1
The organic matter is decomposed in 3 and the generated suspended solids are filtered in the filter bed 12 for filtration. A diffuser 8 is attached to the bottom of the filter bed 13 for biological treatment, and an air washing pipe is attached to the bottom of the filter bed 12 for filtration. Have been.

A carrier having a specific gravity of about 1.0 is appropriately used for the dice-like communicating foam so that the foam is easily stirred by aeration. Open-cell polyethylene, polystyrene,
Polypropylene or the like is suitably used as a carrier. The filling rate of the biological carrier filled in the biological treatment tank is preferably about 75 to 85% in order to easily agitate the carrier during aeration or filter bed washing.

The supply of air is performed by the blower 3, and when air is diffused, the air diffusion valve 5 is opened and the cleaning valve 6 is closed. During air cleaning, the air diffusion valve 5 is closed and the cleaning valve 6 is opened. Become. The treated water that has flowed down to the filter bed 12 passes through the water flow valve 11 and flows to the washing water tank 14.

The filter bed for filtration 12 is usually washed about once a week. First, the water flow valve 11 is closed, and then the washing water drawing valve 10 is opened for several minutes to lower the water level of the biological treatment tank, and then the filter bed for filtration 12 is washed with the washing air discharged from the air washing pipe. While washing water extraction valve 1
Open 0, and drain all the water in the biological treatment tank out of the system. Further, the washing water extraction valve 10 is closed, and the water flow valve 11 is opened. At this time, the treated water stored in the washing water tank 14 flows back through the water flow valve 11 and the filter medium is washed through the filter bed 12 in an upward flow while the water levels of the biological treatment tank 7 and the washing water tank 14 are lowered. It rises until it is almost the same. Drain pump 2 during washing
Is operated, and when the biological treatment tank 7 and the washing water tank 14 are full, the treated water is transferred to the water supply tank 15.

The upper and lower filter beds 13 and 14 are placed in the biological treatment tank 7.
Is provided, a diffuser is usually provided below each tank floor. The air diffuser 8 provided below the upper filter bed is used to supply oxygen to the microorganisms in the biological treatment tank (biological carrier), and the air diffuser 9 provided below the lower filter bed serves as the lower filter bed. Used for backwashing and not normally used for anything other than backwashing.

A nutrient source containing nitrogen and phosphorus is supplied from the nutrient source tank 4 to the biological treatment tank in order to prepare the biological treatment of the waste water and to promote the decomposition of organic components in the waste water. As a nitrogen source and a phosphorus source, a mixed solution of ammonium chloride and phosphoric acid, ammonium phosphate, or the like can be used.

The treated water treated in the biological treatment tank is stored in the washing water tank 14 and sterilized. As the sterilizing agent, a chlorine aqueous solution or the like which easily dissolves in water can be used, and can be supplied from the sterilizing agent tank 19. At this time, the sterilant supply port is located at a position where the treated water is completely sterilized from the relationship between the residence time of the sterilant in the cleaning water tank 14 and the sterilizing effect. In order to improve the mixing of the sterilizing agent, the treated water may be stirred by blowing air into the lower portion of the sterilizing agent supply port with a blower or the like. Further, an apparatus such as an ozone generator and an ultraviolet generator can be used as a sterilizer. These devices may be combined.

With respect to the capacity of the backwash water tank used for backwashing the filter bed of the biological treatment tank, when the uppermost part of the lower filter bed provided in the biological treatment tank 7 is used as a reference surface, the reverse is equivalent to this. It is preferable that the volume above the reference surface of the washing water tank store a volume corresponding to the volume of the filter bed at the bottom of the biological treatment tank. this is,
When performing the backwashing operation described below, it is to reverse the filtered water from the backwashing water tank after draining all the water in the biological treatment tank, the lower filter bed provided at least in the biological treatment tank by the backflowed water. This is for the purpose of being immersed in backflow water.

The water supply tank 15 in the wastewater recycling type treatment apparatus of the present invention is provided with a recycle water inlet at the upper part of the water supply tank while controlling the amount of tap water with a ball tap or the like so as to retain at least one amount of water for car washing. Inject recycled water. Further, the water supply tank 15 is provided with an overflow port, and the overflowed car wash water can flow from the drain pit of the car washer into the first chamber of the separation tank. Further, the overflow port can be disposed below the recycled water inlet, and can have an area equal to or greater than the recycled water inlet area.

[0022]

According to the first or second aspect of the present invention, the wastewater recycling apparatus for a car washer can reduce the heat-retaining work (installation of a heat-retaining device or a heat-retaining material) on pipes connecting the tanks, which contributes to shortening the construction period. I do. It also has the effect of lowering costs. According to the method of claim 3, it is possible to prevent the pipes of the wastewater recycling type car washer from freezing in winter.

[Brief description of the drawings]

FIG. 1 is a flow chart showing the construction, connection and flow of a liquid of a car washer and a wastewater recycling apparatus for a car washer according to the present invention.

FIG. 2 is a schematic flow diagram showing the construction, connection and flow of liquid of a car washer and a conventional waste water recycling apparatus for a car washer.

FIG. 3 is a schematic cross-sectional view of one embodiment of the waste water recycling apparatus for a car washer according to the present invention.

FIG. 4 is a schematic cross-sectional view of one embodiment of a separation tank portion in the wastewater recycling treatment apparatus for a car washer according to the present invention.

[Explanation of symbols]

1: Separation tank (for car wash drainage) 2: Drainage (raw water) pump 3: Air supply means (blower) 4: Nutrient source tank 5: Aeration valve 6: Cleaning valve 7: Biological treatment tank 8: Aeration pipe 9 : Aeration tube (air washing tube) 10: Wash water extraction valve 11: Water flow valve 12: Filtration filter bed 13: Biological treatment filter bed 14: Washing water tank 15: Water supply tank 16: Ball tap 17: Water supply pump 18: Nutrition Source supply pump 19: Sterilizer tank 20: Sterilizer supply pump

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Munehiro Suzuki 1250 Shimoedori, Shimodate-shi, Ibaraki Pref.Hitachi Chemical Industry Co., Ltd.

Claims (3)

[Claims] Claims: 1. A system for storing wastewater discharged from a car washer for storing oil and
A wastewater recycle treatment device for a car washer comprising a separation tank for removing solids, a treatment tank for purifying wastewater from which the oil and solids have been removed, and a water supply tank for supplying water to the car washer. Otherwise, the treated water treated in the treatment tank can be continuously or intermittently circulated in the order of the water supply tank, the separation tank, and the treatment tank (then, return to the water supply tank again).
A wastewater recycle treatment device for a car washer, wherein a bypass connection and a liquid sending means are provided between the water supply tank and the separation tank. 2. The treatment tank comprises a biological treatment tank provided with a nutrient source tank, and a washing water tank provided with a sterilizer, and the biological treatment tank and the washing water tank are connected via a water passage at a lower portion. The wastewater recycling apparatus for a car washer according to claim 1, wherein the wastewater is recycled. 3. The wastewater discharged from the car washer is stored in a separation tank to separate and remove oils and solids, transferred to a treatment tank for purification treatment, and the obtained treated water is stored in a water supply tank. When recycling to a car wash, a bypass connection and a liquid sending means are provided between the water supply tank and the separation tank, and the treated water treated in the treatment tank except when the car washer is in operation is supplied to a water supply tank, a separation tank, and a treatment tank. (After that, return to the water supply tank again.) A method for preventing freezing of pipes of a wastewater recycle treatment device for a car washer, in which the tanks are circulated continuously or intermittently in order to prevent freezing of the pipes.