JP2003305489A - Apparatus and method for recycling treatment of car washed waste water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recycling treatment technique of car washed waste water which is effective for obtaining treated water having water quality suitable for washing water when car washed waste water discharged from a car washer is received, is treated and then the treated water is supplied to the car washer as recycled washing water. <P>SOLUTION: A recycling treating apparatus 100 has a pressure floatation device 110, a biological treatment device 130, a recycling water tank 150 or the like. In the pressure floatation device 110, the car washed waste water discharged from the car washer 300 is pressurized together with air and then is ejected to a low pressure region and floated material (froth) appeared in the low pressure region is removed. In the biological treatment device 130, primary treated water obtained by the pressure floatation device 110 is further aerobically decomposed by using aerobic microorganisms. Secondary treated water obtained by the biological treatment device 130 is once stored in the recycling water tank 150 and then is recycled to the car washer 300 as the washing water. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for recycling car wash wastewater, which receives and treats car wash wastewater discharged from a carwash machine and then supplies the treated water to the carwash machine for recycling as wash water.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of effective use of water resources, a technique for recycling car wash wastewater discharged from a car wash machine installed at a gas station or the like as wash water for a car wash machine has been reviewed. Therefore, a technique for recycling car wash wastewater of this type has been proposed in, for example, Japanese Patent Laid-Open No. 9-314161. The recycling apparatus described in this publication includes an oil / water separation tank, a reaction tank, and the like. In the oil-water separation tank, a process for removing oil and solids from car wash wastewater is performed. The reaction tank is filled with a carrier to which aerobic microorganisms are attached, and in this reaction tank, biological treatment with aerobic microorganisms is performed. The treated water sequentially treated in the oil-water separation tank and the reaction tank is supplied to the car wash machine and recycled as cleaning water.

[0003]

The above-mentioned conventional recycling apparatus is effective in that it can surely suppress an increase in the amount of water used. However, such a recycling apparatus has a limit in removing suspended solids contained in car wash waste water, and the treated water may be darkened. In such a case, there is a concern that the nozzle of the car wash machine may be clogged, the car wash cloth may become dirty, foaming during car wash, or the finish may be poor. In addition, since there is a limit to the removal of suspended solids, if residual suspended solids are mixed in the reaction tank, the microorganisms that perform biological treatment may not function smoothly. In such cases, the biochemical oxygen demand in the treated water, so-called BOD (Biochemical Ox)
Since the components that increase ygenDemand) are not removed smoothly, the treated water may rot in the summer when the water temperature is high and microorganisms are likely to propagate, and odor may be generated from the equipment. As described above, the above-described conventional recycling apparatus has a problem that it is difficult to obtain treated water having a water quality suitable for recycling when treating car wash waste water and recycling it as wash water in the car wash machine. Therefore,
The present inventors have diligently studied this kind of wastewater treatment technology in order to obtain treated water having a water quality suitable for recycling car wash wastewater. As a result of the study, the present inventors removed the suspended matter contained in the car wash drainage as much as possible in the pretreatment of the biological treatment, thereby allowing the downstream biological treatment to function smoothly, thereby darkening the treated water. We also succeeded in finding that the problem of odor generation can be solved reasonably. In the present invention, after receiving and treating the car wash wastewater discharged from the car wash machine, when supplying this treated water to the car wash machine and recycling it as wash water, it is effective to obtain treated water of suitable water quality for the wash water. It is an object to provide a recycling treatment technology for car wash wastewater.

[0004]

In order to solve the above-mentioned problems, a recycling apparatus for car wash wastewater according to the present invention is claimed in claim 1.
~ 4. The method for recycling car wash wastewater according to the present invention is as described in claim 5. The invention according to each of these claims is directed to a first process of removing the floating substances generated in the low-pressure region by pressurizing the car-washing wastewater discharged from the car-washing machine with air and then discharging it to the low-pressure region. A second treatment in which the treated water obtained in the first treatment is biologically treated using aerobic microorganisms,
This is a technology that enables the quality of the wash water to be maintained by supplying the treated water obtained by the above treatment to the car wash machine and recycling it as wash water. The term "recycle" as used herein refers to a mode in which the treated water resulting from car wash drainage is used as a part or all of the wash water in the car wash machine.

According to a first aspect of the present invention, there is provided a recycling apparatus for car wash wastewater, comprising at least a first processing section, a second processing section,
Supply means are provided. In the first and second treatment sections, the car wash drainage discharged from the car wash machine is sequentially treated, and the treated water obtained by these treatments is supplied to the car wash machine through the supply means. The treated water supplied to the car wash machine is recycled as wash water in the car wash machine. Such recycling can suppress an increase in the amount of water used in the car wash machine. In the car wash machine, all or part of the wash water is covered by the treated water obtained in the second treatment section. For example, at the time of finish washing in a car wash machine, a configuration is used in which the source of wash water is switched from the treated water side to the clean water side. The operation of the first processing section, the second processing section, the supply means, etc. is controlled by, for example, control means provided individually or collectively. The first processing section is provided with a pressurizing pump, floating material removing means, and the like. The pressurizing pump has a configuration in which the car wash wastewater is pressurized with air and then the pressurized water is discharged toward a low pressure region which is relatively lower in pressure than the pressurized water. For example, a configuration is used in which the car wash drainage stored in the tank, which is a low pressure region, is circulated by a pressure pump. As the pressurizing pump, a so-called ejector-type pressurizing pump having a gas suction nozzle in the suction portion is preferably used. As a result, the car wash drainage is sucked into the pressurizing pump together with the atmospheric pressure air introduced from the gas suction nozzle during the pump suction process, and pressurized water in which air is dissolved is generated in the car wash drainage during the pump pressurizing process. This pressurized water is discharged to a region of lower pressure than the pressure of the pressurized water. At this time, the pressure of the pressurized water is reduced so that the air dissolved in the pressurized water is released as fine bubbles. And, these fine air bubbles are suspended matter in car wash drainage, so-called SS (Suspended Solid),
It adheres to the non-dissolvable components such as the hardly decomposable foaming component and oil, and forms a floating substance, so-called floss, on the liquid surface. The floss is removed by a floating substance removing means, for example, a floss skimmer or the like. As a result, in the first treatment section, suspended solids (S
It is possible to obtain treated water from which S), non-decomposable foaming components, and non-dissolved components such as oil components are removed as much as possible. Also, this first
In the processing section, since the aerobic state is formed by applying air to the car wash drainage, it is possible to prevent the car wash drainage from being anaerobic and generating an odor. Further, it is possible to reduce the processing load in the carrier filling area in the second processing section. An oil / water separation tank for separating the oil / water of the car wash drain may be appropriately provided at the first processing section or upstream of the first processing section. The second processing unit is provided with a carrier filling area, an air diffuser, a backwash device, and the like. The carrier-filled region has a structure in which a carrier to which aerobic microorganisms adhere is filled. As this carrier, a hollow cylindrical granular carrier is preferably used. The carrier-filled region may have a configuration using one biological treatment tank, or may have a configuration in which a plurality of biological treatment tanks are combined in parallel or in series. The air diffusing device supplies air diffusing air to the carrier-filled region during normal operation, and is configured by using, for example, an air diffusing pipe installed in the biological treatment tank and an air diffusing blower connected to this diffusing pipe. Further, instead of providing the air diffusion pipe in the biological treatment tank, the air diffusion pipe can be provided in the aeration tank arranged upstream of the biological treatment tank. The backwash device supplies backwash air and backwash water to the carrier filling area during backwash operation. For example, the backwash pipe installed in the biological treatment tank and the backwash blower connected to this backwash pipe. , A backwash pump that supplies backwash water to the biological treatment tank. An air lift pump, a submersible pump or the like is preferably used as the backwash pump. The backwash water supplied to the carrier-filled region may be the treated water treated in the biological treatment tank during normal operation, or may be other treated water.
By supplying diffused air to the carrier-filled region by the diffuser during normal operation, air is given to the aerobic microorganisms, and organic pollutants (foam, sludge, etc.) in the treated water are decomposed aerobically. Further, the suspended solids (SS) generated by the aerobic decomposition or the like are filtered by the carrier in the carrier-filled area. At this time, the treated water in which the aerobic microorganisms are aerobically decomposed is one in which the suspended substances and the like are removed as much as possible in the first treatment section, and therefore the aerobic microorganisms function smoothly without being disturbed by the suspended substances and the like. To do. As a result, the biochemical oxygen demand in the treated water, so-called BOD (Biochemical Ox)
ygenDemand) can be smoothly removed. Therefore, it is possible to prevent the treated water from spoiling and generating an odor from the device in the summer when the water temperature is high and microorganisms are easily propagated. In this way, the treated water sequentially treated by the first treatment section and the second treatment section has a water quality that is suitable for washing water in a car wash machine and that suppresses darkening and odor. In the backwash operation, the backwash air and backwash water act on the carrier in which the floating substances are trapped during the normal operation, whereby the floating substances are separated from the carrier. The water containing the separated suspended solids is discharged as backwash drainage toward a sludge area, for example, sewage or a sludge storage tank configured to store the feed of a sludge treatment device. The supply means
The structure is such that the treated water after being treated in the second treatment section is supplied to the car wash machine side through a connection path that connects the downstream side of the second treatment section and the car wash machine, and an air lift utilizing the principle of pumping. Pumps, submersible pumps, transfer pipes using the so-called extrusion flow principle, and the like are preferably used. As described above, according to the recycling apparatus for car wash wastewater according to the first aspect, it is possible to obtain the treated water having the water quality suitable as the wash water in the car washing machine. The car wash machine and the equipment incidental to the car wash machine may or may not be included in the recycling apparatus of the present invention.

[0006] Here, in the car wash wastewater recycling treatment apparatus according to the first aspect, it is preferable that the second treatment section is provided with a treated water discharge means as described in the second aspect. The treated water discharge means temporarily discharges the treated water treated in the carrier filling area to the sludge area after the backwashing operation of the carrier filling area, and connects the carrier filling area and the sludge area. It is configured using a path or the like. As a result, the treated water treated in the carrier-filled area after the backwash operation is temporarily discharged through the connection path to a sludge area such as a sludge storage tank that stores sludge and the like. The term "temporary" as used herein means, for example, that a predetermined fixed amount of treatment is processed from the end of the backwash operation until a predetermined time elapses, and from the end of the backwash operation. It means until the time. As a result, it is possible to prevent the treated water whose water quality has not been stabilized after the backwash operation from being supplied as wash water to the car wash machine. Therefore, according to the recycling apparatus for car wash wastewater according to the second aspect, it is possible to realize a rational recycling apparatus for car wash wastewater in consideration of fluctuations in water quality after backwash operation in the carrier filling region.

Further, in the recycling apparatus for car wash wastewater according to the third aspect, for example, a tank-shaped storage section is provided,
The treated water treated by the second treatment unit is stored in this storage unit. The treated water in the reservoir is supplied to the car wash machine as washing water through the supply means during normal operation. Further, the treated water in the storage section is supplied to the carrier filling region as backwash water through the backwash device during the backwash operation. That is, one reservoir serves both as a supply source of the wash water for the car washer and a backwash water for the carrier filling region.
This makes it possible to save space in the recycling apparatus. Such space saving is particularly effective in a gas station or the like where the installation space is limited.

Further, in the apparatus for recycling car wash wastewater according to a fourth aspect of the present invention, the second treatment section has a plurality of biological treatment tanks having a carrier filling region, a first connection path and a second connection path. It is provided. The first connection path has a configuration capable of connecting a plurality of biological treatment tanks and the downstream side of the first treatment section in parallel during normal operation. The second connection path has a configuration capable of supplying backwash water in parallel to a plurality of biological treatment tanks during backwash operation. Thereby, during normal operation, the treated water treated in the first treatment section can be biologically treated in parallel in a plurality of biological treatment tanks. Further, since a plurality of biological treatment tanks are provided, even if one of the biological treatment tanks is blocked during normal operation, the treatment can be continued by another biological treatment tank, and reliability is improved. be able to. Further, during the backwash operation, backwash water can be individually supplied to each biological treatment tank to individually backwash each biological treatment tank. Therefore, the air volume of the backwash blower that supplies the backwash air can be covered by the air volume corresponding to each biological treatment tank, and the backwash blower can be made smaller than when backwashing multiple biological treatment tanks at once. Can be converted. This downsizing of the backwash blower leads to a reduction in equipment cost, a backwash blower installation space, and a reduction in maintenance work for the backwash blower. In addition, biological treatment tanks other than the biological treatment tank in which the backwash operation is performed are rational because the biological treatment during normal operation can be continued. Furthermore, by individually performing the backwashing operation, the amount of backwashing water used at one time can be reduced, and the storage unit that stores the backwashing water can be downsized.

In the method for recycling car wash wastewater according to the fifth aspect, the first treatment step and the second treatment step are carried out,
The treated water obtained in the second treatment step is supplied to the car washing machine and recycled as washing water. In the first treatment step, the car wash drainage discharged from the car wash machine is pressurized with air and then discharged to the low pressure region. For example, a pressurizing pump configured to pressurize car wash drainage with air and then discharge the pressurized water toward a low pressure region is used. The pressure of the pressurized water is reduced in the low pressure region, and the air dissolved in the pressurized water is released as fine bubbles. Then, the fine air bubbles adhere to the suspended solids (SS) in the car wash drainage, the hardly decomposable foaming components, and the non-dissolving components such as oil, and form floating substances, so-called floss, on the liquid surface. Further, in the first processing step, this floss is removed by using floss skimmer or the like. As a result, it is possible to obtain the treated water from which the suspended solids (SS) in the car wash drainage that cause darkening, the hardly decomposable foaming components, and the non-dissolving components such as oil components are removed as much as possible. Further, it becomes possible to reduce the load in the carrier filling region in the second processing step. In the second treatment step, the treated water obtained in the first treatment step is biologically treated using aerobic microorganisms. The treated water obtained in the first treatment step is supplied to, for example, a carrier-filled region having a structure filled with a carrier to which aerobic microorganisms adhere, and aerated air is supplied to the aerobic microorganisms in the carrier-filled region. The configuration is used. As a result, organic pollutants (foam, sludge, etc.) in the treated water can be aerobically decomposed by aerobic microorganisms, and the components that increase the biochemical oxygen demand in the treated water, so-called BOD (Biochemical Oxygen Demand). Smooth removal is possible. Therefore, it is possible to prevent the treated water from spoiling and generating an odor from the device in the summer when the water temperature is high and microorganisms are easily propagated. In this way, the treated water sequentially treated by the first treatment step and the second treatment step has a water quality suitable for washing water in a car washing machine, in which darkening and odor are suppressed. The treated water obtained in the second treatment step is supplied to the car wash machine using an air lift pump or a submersible pump that uses the principle of pressure feeding, or a transfer pipe that uses the so-called push flow principle. As described above, according to the method for recycling treatment of car wash wastewater according to the fifth aspect, it is possible to obtain treated water having a water quality suitable for washing water in a car wash machine.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a recycling apparatus for car wash wastewater according to the present invention will be described below with reference to the drawings. In addition, the recycling processing apparatus 1 according to the present embodiment
00 will be described with reference to FIGS. 1 and 2.
Here, FIG. 1 shows a recycling apparatus 10 according to the present embodiment.
It is a figure which shows the schematic process flow of 0. FIG. 2 is a diagram showing a schematic configuration of the recycling processing apparatus 100 of this embodiment. In the present embodiment, the recycling processing device 10
By using 0, the car wash wastewater discharged from the car wash machine 300 is received by the pressure levitation device 110 for treatment, further received by the biological treatment device 130 for treatment, and then recycled to the car wash machine 300 via the recycle water tank 150. The recycling technology will be described.

As shown in FIG. 1, the recycling processing apparatus 100 of the present embodiment has a structure for receiving and processing car wash waste water discharged from a car washing machine 300 installed at a gas station or the like. This recycling apparatus 100
Are roughly classified into a pressure floating device 110 and a biological treatment device 13.
0, a recycle water tank 150 and the like. The car wash wastewater is treated by the pressure flotation device 110 to be primary treated water, and then treated by the biological treatment device 130 to be secondary treated water.
This secondary treated water is once stored in the recycle water tank 150 and then recycled as washing water to the car wash machine 300.

As shown in FIG. 2, the car wash machine 300 includes a car wash machine body 302 for car wash processing, a clean water supply tank 304 for supplying clean water to the car wash machine body 302, and the like. The clean water supply tank 304 is supplied with clean water through a supply pipe 306. The clean water stored in the clean water supply tank 304 is used during the finish washing operation of the car wash machine 300. The car wash drainage discharged from the car wash machine 300 flows into a drainage pit 310 buried below the car wash machine 300 and is temporarily stored therein. This drainage pit 31
The car wash drainage flowing into 0 is supplied to the recycle processing apparatus 100 via the inflow pump 312 and the inflow pipe 316 installed in the drainage pit 310. An overflow pipe 314 that leads to sewage is provided at a predetermined water level of the drainage pit 310, and it is possible to prevent excessive car wash drainage from flowing into the recycling treatment equipment 100 side and deteriorating the treatment performance at the time of a temporary peak inflow. It is configured.

The inflow pump 312 has a structure using a submersible pump. The inflow pump 312 is used in the drainage pit 31.
A water level sensor (not shown) that detects a water level of 0 is provided, and the operation is started after the car wash machine 300 is used, and is controlled so as to continue the operation until the drainage pit 310 reaches a predetermined water level. That is, the inflow pump 312 is the car wash machine 300.
It is configured to work with. Car wash machine 300
With the configuration in which the inflow pump 312 is started after being used, it is possible to prevent rainwater that has flowed into the drainage pit 310 from being supplied to the recycling treatment apparatus 100 and treated.

The recycle processing apparatus 100 is provided with a coagulant addition device 210 for adding a coagulant to the car wash wastewater at a predetermined ratio upstream of the pressure flotation device 110. The coagulant adding device 210 includes a coagulant tank 212 that stores the coagulant, and a coagulant pump 214 that pressure-feeds the coagulant in the coagulant tank 212 to the inflow pipe 316. The addition of the coagulant to the car wash drainage facilitates the sludge settling in the pressurized flotation tank 112 described later.

The pressure levitation device 110 comprises a pressure levitation tank 11
2. A pressure pump 114 and the like are provided, and a floss skimmer 116 and an inclined member 118 are provided in the pressure floating tank 112. The pressure flotation tank 112 receives and stores the car wash drainage flowing in together with the coagulant through the inflow pipe 316. The pressurizing pump 114 is a so-called ejector type gas-liquid mixing pump, and is configured to suck atmospheric pressure air through a suction nozzle (not shown) together with car wash drainage during a suction process. The pressurizing pump 114 pressurizes the car wash wastewater in the pressurizing flotation tank 112 together with air, and then discharges this pressurized water into the pressurizing floating tank 112 (corresponding to the low pressure region in the present invention). That is, the pressure floating tank 11
The car wash drainage stored in 2 is circulated by the pressure pump 114. At this time, the pressure of the pressurized water is returned to normal pressure, so that the air dissolved in the pressurized water is released as fine bubbles. And, these fine air bubbles are suspended substances (SS) contained in car wash drainage, persistent decomposing components,
It adheres to non-dissolved components such as oil, and the non-dissolved components are floated on the water surface of the pressure floating tank 112. As a result, a layered floss (corresponding to the floating material in the present invention) is formed on the water surface of the pressure floating tank 112. Moreover, this pressure floating tank 1
In No. 12, since the aerobic state is formed by applying air to the car wash drainage, it is possible to prevent the car wash drainage from being anaerobic and generating an odor. The pressurizing pump 11
It is preferable that the operation of No. 4 is started at the same time when the car wash waste water flows into the pressure floating tank 112.

The floss formed on the water surface of the pressure levitation tank 112 is the floss skimmer 1 installed in the pressure levitation tank 112.
It is collected by 16 and is discharged to the sewage through the discharge pipe 117. In addition, it is preferable that the operation of the floss skimmer 116 be started after a lapse of a certain time after the car wash drainage flows into the pressure floating tank 112. This floss sukima 1
Reference numeral 16 corresponds to the floating material discharging means in the present invention.
In addition, the sludge which has not floated to the surface of the water due to the coagulant added from the coagulant adding device 210 is drawn out from the bottom of the pressure flotation tank 112 by a discharge means (not shown) such as an air lift pump, and the like through the discharge pipe 119. Discharged to sewage. In the present embodiment, an inclined member 118 configured to enable smooth discharge of sludge is provided at the bottom of the pressure floating tank 112. In addition, it is preferable that the operation of the discharging means is performed at the time when the car wash wastewater does not flow into the pressurized flotation tank 112 or at the time of backwashing operation of the biological treatment apparatus 130 described later.

The treated water (primary treated water) from which the floss, sludge and the like have been removed in the pressure floating tank 112 is admitted to the biological treatment apparatus 130 through the advection pipe 120 by the so-called push flow principle. The advection pipe 120 has a configuration capable of connecting the pressure floating tank 112 and each biological treatment tank 132 in parallel, and thus the advection pipe 120 corresponds to the first connection path in the present invention. The primary treated water is in a state in which suspended matter (SS) in car wash drainage that causes darkening, non-dissolvable foaming components, non-dissolved components such as oil components are removed as much as possible by the pressure flotation device 110. is there. The primary treated water having such a water quality can reduce the treatment load on the biological treatment apparatus 130. The treatment process of the car wash wastewater in the pressure flotation device 110 corresponds to the first treatment process of the present invention.

The biological treatment apparatus 130 comprises a total of four biological treatment tanks 132, an air diffuser corresponding to each biological treatment tank 132, and a backwash device. The biological treatment tank 132 has a carrier filling region 133 in each, and the carrier filling region 133 is
For example, a hollow cylindrical carrier C is filled. Aerobic microorganisms adhere to the carrier C. As the material of this carrier C, for example, pearlite, shirasu balloon, foam concrete, activated carbon, porous ceramics, inorganic carriers such as porous glass, synthetic resin carriers such as polyethylene, polypropylene, polyvinyl chloride, polyurethane, etc. are widely used. be able to.

The air diffusing device has a total of four diffusing tubes 134 installed below the carrier filling area 133 in each biological treatment tank 132, and a total of four diffusing blowers for supplying diffused air to each of these diffusing tubes 134. 136. Since the air diffuser 134 is installed below the carrier filling region 133 and the diffused air is supplied to the entire carrier filling region 133, an aerobic state of the treated water can be easily formed. For example, as compared with the case where the air diffusing pipe 134 is installed in the carrier filling region 133, the region where the diffused air is difficult to be supplied can be reduced as much as possible. Therefore, it has an effect of preventing the generation of odor as much as possible. On the other hand, the backwash device is used for each biological treatment tank 13
2, a total of 4 installed below the carrier filling area 133.
It has one backwash pipe 144, one backwash blower 146 that supplies backwash air to each backwash pipe 144 in common, a backwash pump described later, and the like. Further, each biological treatment tank 132 is provided with a discharge pipe 142 that discharges the backwash drainage during the backwash operation to sewage. The primary treated water received in the biological treatment tank 132 during normal operation is the carrier filling region 133.
2 is drawn down from the bottom of the biological treatment apparatus 130 and is admitted to the recycle water tank 150 through the advection pipe 140 according to the so-called push flow principle. The biological treatment apparatus 130 and the like constitute the second treatment section of the present invention, and the recycled water tank 150 corresponds to the storage section of the present invention.

The recycle water tank 150 includes a wash water supply pump 152, a circulation pump 154, and a backwash pump 15 in the tank.
6 is installed. Each of these pumps uses a structure of a submersible pump or an air lift pump. The wash water supply pump 152 has its discharge part connected to the car wash main body 302 by a supply pipe 162, and supplies the secondary treated water stored in the recycled water tank 150 to the car wash main body 302 through the supply pipe 162 during normal operation. It is configured to do. This wash water supply pump 152, supply pipe 1
The supply means in the present invention is constituted by 62 and the like. The discharge part of the circulation pump 154 has a supply pipe 164.
The secondary treated water stored in the recycled water tank 150 is connected to the pressure floating tank 112 by the supply pipe 164.
It is configured to circulate through the pressure floating tank 112. The circulation pump 154 is appropriately operated when the secondary treated water stays in the recycled water tank 150 for a long period of time. The backwash pump 156 has a backwash pipe 166 at its discharge portion.
Is connected to the bottom of each biological treatment tank 132 by
The secondary treated water stored in the recycle water tank 150 is configured to be supplied to each biological treatment tank 132 through the backwash pipe 166 during the backwash operation. That is, in the present embodiment, since the supply source of the wash water to the car wash machine 300 and the backwash water to the biological treatment tank 132 are both used by the single recycle water tank 150, space saving of the recycle processing apparatus 100 can be achieved. It is possible to plan.

The backwash pipe 166 has a construction in which the biological treatment tanks 132 and the recycled water tank 150 can be connected in parallel. Therefore, the backwash pipe 166 corresponds to the second connection path in the present invention. . A one-pass discharge pipe 170 that communicates with the sewage is connected to the backwash pipe 166. The 1-pass discharge pipe 170 is used for the biological treatment tank 132.
The treated water treated in (1) is discharged directly from the upstream of the recycle water tank 150 to the sewage, and is used for stabilizing the quality of the treated water in the temporary operation described later.
That is, the “1 pass” referred to here is the biological treatment tank 13
2 shows a mode in which the treated water treated in 2 is discharged without recycling. The one-pass discharge pipe 170 and the like constitute the treated water discharge means of the present invention.

This recycled water tank 150 has two
A hypochlorous acid addition device 220 for adding hypochlorous acid to the secondary treated water at a predetermined ratio is provided. The hypochlorous acid adding device 220 includes a hypochlorous acid tank 222 for storing hypochlorous acid, and a hypochlorous acid pump 2 for pumping hypochlorous acid in the hypochlorous acid tank 222 to the recycle water tank 150.
24 are provided. As a result, the secondary treated water is chemically treated with hypochlorous acid.

A supply pipe 180 for supplying clean water is connected to the recycle water tank 150. If the water level in the recycled water tank 150 drops during backwashing operation,
Clean water is supplied to the recycled water tank 150 through the supply pipe 180. With such a configuration, a part of the treated water in the recycled water tank 150 is replaced with clean water, and the treated water in the recycled water tank 150 is washed by the car wash machine 30.
It is possible to prevent the water quality from deteriorating when repeatedly recycled as wash water of 0. Also, this recycled water tank 1
In 50, an overflow pipe 168 is provided at the top of the tank, and a drain pipe 169 is provided at the bottom of the tank. The overflow pipe 168 and the drain pipe 169 are both connected to the sewage, and allow the overflow water and the drain to be discharged to the sewage. Although not shown, a flow path switching valve, a sluice valve, a flow meter, and the like are appropriately provided in each part of the recycling apparatus 100 having the above-described configuration, if necessary.

Next, the recycle processing apparatus 10 having the above structure
The operating mode of No. 0 will be described with reference to FIGS. Here, FIG. 3 is a diagram showing a state of the biological treatment apparatus 130 during normal operation. Further, FIG. 4 is a diagram showing a state of the biological treatment apparatus 130 during the backwash operation. Also, FIG.
Is the biological treatment apparatus 130 during the temporary operation after the backwash operation
It is a figure which shows the state of. In these figures, the white-marked valves indicate that the valves are open, and the black-marked valves indicate that the valves are closed.
The recycling apparatus 100 has three operation modes, that is, a normal operation, a backwash operation, and a temporary operation after the backwash operation. The operation of each device constituting the recycle processing apparatus 100 is controlled by a control panel (control means) provided individually or collectively.

In the normal operation, the primary treated water treated by the pressure flotation device 110 is biologically treated by the biological treatment device 130. As shown in FIG. 3, in this normal operation, the treated water treated by the pressure flotation device 110 is adsorbed in parallel to the four biological treatment tanks 132 through the advection pipe 120. In addition, four diffuser blowers 1 corresponding to each biological treatment tank 132
36 is operated, and a predetermined amount of diffused air is supplied from the diffuser pipe 134 into the tank. As a result, diffused air is provided to the aerobic microorganisms in the carrier-filled region 133 in each biological treatment tank 132, and the organic pollutants (foam, sludge, etc.) in the primary treated water are aerobically decomposed. At this time, the primary treated water in which the aerobic microorganisms are aerobically decomposed is one in which the suspended substances and the like have been removed as much as possible in the pressure flotation device 110, so that the aerobic microorganisms are not disturbed by the suspended substances and are smooth. To function.
This makes it possible to smoothly remove components that increase the biochemical oxygen demand in the treated water, so-called BOD (Biochemical Oxygen Demand). Therefore, it is possible to prevent odors from being generated from the recycle processing apparatus 100 and the car wash machine 300 due to putrefaction of the treated water in the summer when the water temperature is high and microorganisms are likely to propagate. In addition, in this normal operation, suspended solids (SS) generated by aerobic decomposition, etc.
Etc. are filtered and captured by the carrier C in the carrier filling region 133. That is, in the present embodiment, the carrier C has a weight that can suppress fluidization when the diffused air is supplied from the diffuser pipe 134, and thus the carrier C forms a filtration region. The Rukoto.
In this way, the secondary treated water obtained by being sequentially treated by the pressure flotation device 110 and the biological treatment device 130 is recycled through the advection pipe 140 to the recycle water tank 150.
Sent to. The secondary treated water has a water quality suitable for washing water in the car wash machine 300, which suppresses generation of darkening and odor. The biological treatment device 13 in this normal operation
The processing step at 0 corresponds to the second processing step in the present invention.

In the backwash operation, the normal operation is continued for a preset time and then the biological treatment tank 132 is washed. As shown in FIG. 4, in this backwashing operation, the operation of the three biological treatment tanks 132 out of the four is continued, and only the predetermined biological treatment tank 132 to be backwashed is washed. The backwash blower 146 is operated, and a predetermined amount of backwash air is supplied from the backwash pipe 144 of the biological treatment tank 132 to be backwashed into the tank. The air volume of the backwash air is preferably larger than the air volume of the diffused air during the normal operation. Further, the operation of the backwash pump 156 is started, and the recycled water tank 150
The secondary treated water stored in the
6 is supplied to the biological treatment tank 132 to be backwashed. Since this backwash water is supplied from the bottom of the biological treatment tank 132, it flows upward through the carrier filling region 133. Due to such action of backwash air and backwash water, suspended substances (SS) and the like trapped on the carrier C during normal operation are separated from the carrier C and discharged to the sewage as backwash drainage through the discharge pipe 142. After this treatment is continued for a preset time, the biological treatment tank 132 is switched to a temporary operation described later, and this time, another biological treatment tank 132 is switched to the backwash operation. In this way, the backwash operation of the four biological treatment tanks 132 is sequentially performed. According to such backwashing operation, since each biological treatment tank 132 can be separately washed in a plurality of times,
The air volume of the backwash blower 146 that supplies the backwash air can be covered by the air volume corresponding to each biological treatment tank 132, and the backwash blower can be made smaller than when backwashing a plurality of biological treatment tanks at once. Can be converted. This downsizing of the backwash blower leads to a reduction in equipment cost, a backwash blower installation space, and a reduction in maintenance work for the backwash blower. Further, since each biological treatment tank 132 can be separately washed in a plurality of times, the amount of backwash water used at one time can be reduced, and the recycled water tank 150 for storing the secondary treated water used as backwash water can be reduced. Larger size, recycled water tank 150
It is possible to avoid as much as possible the problem of odor generation due to an increase in the residence time.

The temporary operation is performed on the biological treatment tank 132 for which the backwash operation has been completed. As shown in FIG. 5, in this temporary operation, the downstream path of the predetermined biological treatment tank 132 is switched from the advection pipe 140 side to the one-pass discharge pipe 170 side.
As a result, the primary treated water received from the pressure flotation device 110 flows down a predetermined biological treatment tank 132, and then is discharged to the sewage through the 1-pass discharge pipe 170. As a result, it is possible to prevent the treated water whose water quality after the backwashing operation is not stabilized from flowing out to the recycled water tank 150 and being supplied to the car wash machine 300. This temporary operation is continued, for example, from the end of the backwash operation until a preset fixed time elapses, and from the end of the backwash operation until the preset fixed processing amount is processed.

As described above, according to the present embodiment, by suitably combining the pressure floating device 110 and the biological treatment device 130, it is possible to remove floating substances and the like in car wash drainage as much as possible. Moreover, by removing the suspended solids and the like as much as possible, the aerobic microorganisms of the biological treatment apparatus 130 are not disturbed by the suspended solids or the like, and the aerobic microorganisms can smoothly function. That is, the pressure levitation device 11
0 indicates suspended solids (S
S), the hardly decomposable foaming component, the removal of non-dissolving components such as oil, the prevention of odor by forming an aerobic state of car wash drainage, and the reduction of the treatment load on the biological treatment device 130. . Further, the biological treatment apparatus 130 aerobically decomposes organic pollutants (foam, sludge, etc.) in the primary treated water, and the suspended solids (SS) generated by the aerobic decomposition etc. are filtered and washed in the carrier-filled area and treated. It enables odor prevention by forming an aerobic state of water. This allows
It is possible to obtain treated water of water quality that suppresses the generation of darkening and odor, which is suitable for washing water in a car wash machine, and the problem is that the nozzle of the car wash machine is clogged, the car wash cloth becomes dirty, and the foaming and finish of the car wash deteriorates. Can be avoided. Also,
According to this embodiment, in the temporary operation after the backwashing operation, the treated water whose water quality is not stabilized is discharged to the sewage, so that the treated water whose water quality is not stabilized after the backwashing operation is the recycled water tank. It is possible to prevent it from flowing out to 150 and being supplied to the car wash machine 300. Further, according to the present embodiment, the washing water for the car wash machine 300 and the biological treatment device 1
32 recycled water tanks with one source of backwash water to 32
Since it is also used as a storage device, it is possible to save space in the recycling device. Such space saving is particularly effective in a gas station or the like where the installation space is limited. Further, according to the present embodiment,
Since a plurality of biological treatment tanks 132 are provided, even if one of the biological treatment tanks is closed, the treatment can be continued by another biological treatment tank, and the reliability can be improved. Further, by individually cleaning each biological treatment tank 132 in a plurality of times during the backwash operation, the backwash blower 146 is downsized, thereby reducing the device cost, reducing the backwash blower installation space, and the backwash blower. It is possible to reduce maintenance work related to. Furthermore, the amount of backwash water used at one time during the backwash operation can be reduced, and the recycle water tank 1 that stores the secondary treated water used as the backwash water 1
It is possible to avoid problems such as an increase in size of 50 and generation of odor due to an increase in residence time in the recycled water tank 150 as much as possible.

[Other Embodiments] The present invention is not limited to the above embodiments, and various applications and modifications are conceivable. For example, each of the following modes to which the above-described embodiment is applied can be implemented.

(A) In the above embodiment, the pressure levitation device 110 is constructed by using the pressurizing pump 114 which sucks atmospheric air together with car wash drainage. However, a compressor for supplying compressed air, car wash drainage The pressure levitation device can also be configured using a line mixer or the like that mixes air with air.

(B) In the above embodiment, the case where the four biological treatment tanks 132 are used in parallel during the normal operation and the four biological treatment tanks 132 are switched during the backwash operation is described. The number of biological treatment tanks, usage pattern, etc. can be variously changed as necessary. For example, it is possible to use a mode in which the four biological treatment tanks 132 are backwashed simultaneously during the backwashing operation.

(C) In the above embodiment, the 1-pass discharge pipe 170 used during the temporary operation is replaced with the backwash pipe 166.
However, the one-pass discharge pipe 170 may be branched from the advection pipe 140 or may be installed in the biological treatment tank 132 itself.

(D) Further, in the above-described embodiment, the structure in which the removed material removed by the recycle processing apparatus 100 is discharged to the sewage has been described. However, the sludge having the composition in which the feed of the sludge processing apparatus is stored. It can also be configured to discharge to a storage tank.

(E) Further, in addition to the respective devices and tanks constituting the recycling apparatus 100 of the above-mentioned embodiment, it is possible to add a device or tank having another mechanism. For example,
The pressure levitation device 110 or an oil / water separation tank for separating oil / water of car wash waste water may be appropriately provided upstream of the pressure levitation device 110. Further, in the biological treatment device 132, an air diffuser 134
Instead of providing the above structure, a structure in which a preliminary aeration tank is provided upstream of the biological treatment device 132 may be used. In this case, it is preferable to use a configuration in which the treated water treated by the biological treatment device 132 can be circulated in the preliminary aeration tank or upstream of the preliminary aeration tank.

(F) In addition, in the above-described embodiment, the diffusion pipe 134 is set in the carrier filling region 1 in consideration of facilitating formation of the aerobic state of the treated water in the biological treatment apparatus 132.
Although a case where the weight of the carrier C is set below 33 to set a filtration region by the carrier C so as to suppress fluidization by diffused air is described, the diffuser pipe 134 is installed. The position and the weight of the carrier C are not limited to this, and can be variously changed in consideration of mutual relationships. For example, the air diffuser 134 can be installed in the carrier filling region 133, and the weight of the carrier C can be made lighter than that in the above embodiment. In this case,
A biological treatment region in which the carrier C is fluidized is formed above the air diffuser pipe 134, and a filtration region by the carrier C is formed below the air diffuser pipe 134. Such a configuration is effective in reducing the required air volume of the air diffuser 136.

(G) Further, in the biological treatment tank 132 of the above-described embodiment, the case where the treated water flows downward in the carrier filling region 133 during the normal operation is described, but the treated water flows in the carrier filling region 133. You may use the structure which flows upwards.

(H) In the above embodiment, the recycle processing apparatus 100 and the car wash machine 300 are described separately, but the recycle processing apparatus 100, the car wash machine 300 and the like together constitute the recycle processing apparatus of the present invention. You may.

[0038]

As described above, according to the present invention,
After receiving and treating the car wash drainage discharged from the car wash machine and supplying this treated water to the car wash machine and recycling it as wash water, recycling of the car wash drainage effective to obtain treated water of suitable water quality for the wash water Processing technology can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic processing flow of a recycling processing apparatus 100 according to the present embodiment.

FIG. 2 is a diagram showing a schematic configuration of a recycling processing apparatus 100 according to the present embodiment.

FIG. 3 is a diagram showing a state of a biological treatment device 130 during normal operation.

FIG. 4 is a diagram showing a state of a biological treatment device 130 during a backwash operation.

FIG. 5 is a diagram showing a state of the biological treatment device 130 during a temporary operation after the backwash operation.

[Explanation of symbols]

100 ... Recycle processing equipment 110 ... Pressure floating device (first processing unit) 112 ... Pressurized flotation tank 114 ... Pressurizing pump 116 ... Floss skimmer (floating object removing means) 118 ... Inclined member 130 ... Biological processing device (second processing unit) 132 ... Biological treatment tank 133 ... Carrier filling area 134 ... Air diffuser 136 ... Aeration blower 140 ... Advection piping (first connection path) 144 ... Backwash tube 146 ... Backwash blower 150 ... Recycled water tank (storage part) 152 ... Washing water supply pump 154 ... Circulation pump 156 ... Backwash pump 166 ... Backwash pipe (second connection path) 170 ... 1-pass discharge pipe (processed water discharge means) 210 ... Flocculant addition device 220 ... Hypochlorous acid addition device 300 ... car wash machine 310 ... drainage pit

Continued front page    (72) Inventor Koichi Matsuo             33 Fujiyama, Yamanashi, Yamayashiki-cho, Chiryu-shi, Aichi             Lean Industry Co., Ltd. Water Environment Research Institute (72) Inventor Sayuri Fujita             33 Fujiyama, Yamanashi, Yamayashiki-cho, Chiryu-shi, Aichi             Lean Industry Co., Ltd. Water Environment Research Institute F-term (reference) 3D026 AA17                 4D003 AA01 AB02 BA02 CA02 CA04                       DA08 DA22 DA29 EA15 EA19                       EA22 EA23 EA24 EA25 EA30                       FA01 FA05 FA06                 4D037 AA13 AB02 AB06 BA02 BB03                       BB07 CA07 CA08 CA16

Claims (5)

[Claims] 1. A car wash effluent that has a treatment section for treating car wash effluent discharged from a car wash machine and supplies treated water treated by this treatment section to the car wash machine through a supply means and recycles it as wash water. A recycling apparatus, wherein the treatment section has first and second treatment sections that sequentially treat the car wash wastewater, and the first treatment section pressurizes the car wash wastewater together with air. A pressurizing pump for discharging to a low-pressure region and a floating substance removing means for removing floating substances generated in the low-pressure region are provided, and the second processing unit is a carrier filled with a carrier to which aerobic microorganisms adhere. A filling region, an air diffuser for supplying diffused air to this carrier filling region during normal operation, and a backwash device for supplying backwash air and backwash water to this carrier filling region during backwash operation are provided. Car wash drainage characterized by Cycle processor. 2. The car wash wastewater recycling treatment apparatus according to claim 1, wherein the second treatment section treats the treated water treated in the carrier-filled area after backwashing the carrier-filled area. An apparatus for recycling treatment of car wash wastewater, which is provided with a treated water discharge means for temporarily discharging the wastewater to the sludge area. 3. The car wash wastewater recycling treatment apparatus according to claim 1 or 2, further comprising: a storage unit configured to store the treatment water treated by the second treatment unit. During normal operation, the cleaning water is supplied to the car wash machine as the cleaning water, and during backwashing operation, the backwashing water is supplied to the carrier filling area as the backwash water. A recycling treatment device for car wash wastewater. 4. The car wash wastewater recycling treatment apparatus according to claim 1, wherein the second treatment unit has a plurality of biological treatment tanks having the carrier filling region, and a normal operation. Sometimes, the biological treatment tank and the downstream side of the first treatment section can be connected in parallel to each other, and the backwash water can be supplied to the biological treatment tank in parallel during the backwash operation. A recycling treatment device for car wash wastewater, characterized in that a second connection path is provided. 5. A first processing step of pressurizing car wash wastewater discharged from a car wash machine together with air, and then discharging the carwash wastewater to a low pressure region to remove floating substances generated in the low pressure region, and the first process step.
A second treatment step of biologically treating the treated water obtained in the treatment step described above using aerobic microorganisms, and supplying the treated water obtained in the second treatment step to the car washing machine. A method for recycling car wash wastewater, which is characterized in that it is recycled as.