JP2951588B2 - Car wash method and silica removal system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car washing method for washing a railway car or the like using pure water from which impurities such as silica have been removed, and also to a car washing method in which impurities such as silica have been removed by a reverse osmosis membrane method. The present invention relates to a silica removal system for producing and storing pure water.

[0002]

2. Description of the Related Art When a window glass of a railway vehicle is already contaminated, the adhered substance on the glass surface is dissolved and removed using a fluorine-based chemical, or the adhered substance is removed using a strongly acidic chemical. A method of dissolving and removing, a method of polishing an attached substance with a polishing compound to remove it, or replacing a stained glass with a new glass has been adopted. After the window glass is restored to a transparent state (a state without white turbidity), the railway car is washed as a continuous operation. As the water for car washing, industrial water, well water and tap water are used exclusively.
For example, data as shown in FIG. 7 is obtained.

[0003]

The inventor of the present invention has conducted various studies on the effect of the water quality for car washing as shown in FIG. 7 on railway vehicles, and has found the following problems. First, iron and manganese components may oxidize and cause red rust and black stains to adhere to the car body, and the hardness (M
The g, Ca) component has a problem that white powdery residue adheres and is not removed until the next washing. In addition, silica (Si
O ₂ ) leaves white adhering drops on the window glass. However, since silica is the same component as glass and has a strong binding force, it cannot be removed by the next washing and accumulates with each washing operation. As a result, there is a problem that scaly cloudy stain occurs and finally the window glass becomes cloudy like "frosted glass". These problems are caused by the water quality of the washing water, so even if the water droplets remaining on the glass surface after car washing are wiped off or blown off by compressed air or a fan, the fundamental solution is taken. Does not. In addition, there is a method of removing silica by an ion exchange method.However, when removing silica by an ion exchange method, hydrochloric acid or caustic soda must be used for resin regeneration washing, so there is a problem of environmental pollution due to wastewater. In addition, there is a problem that extra equipment and cost are required for wastewater treatment. The present invention is based on these considerations and provides a car washing water silica removal system capable of improving car washing water without making environmental pollution a problem and realizing a reliable car washing operation. It is another object of the present invention to provide a car wash method for realizing a high-performance car wash using the system.

[0004]

To achieve the above object, a method for washing a commercial vehicle according to claim 1 is a silica removing apparatus for removing impurities such as silica from raw water for car washing by a reverse osmosis membrane method. And a water storage tank for storing the RO treated water obtained from the silica removing device, so that the RO treated water from the water storage tank is supplied to the water spray brushing washing unit and the subsequent water washing unit of the car washing device. I have. In addition, the silica removal system according to claim 3 includes a silica removal device that removes impurities such as silica from raw water for car washing by a reverse osmosis membrane method, and a water tank that stores RO treated water obtained from the silica removal device. And the RO treated water from the water storage tank is supplied to the sprinkling brushing washing section and the water washing section of the car washing apparatus. The car washing device typically includes a chemical washing machine and a fresh water washing machine, and the fresh water washing machine includes a water spray brushing washing section and a water washing section. Here, the watering brushing and washing unit injects water in synchronization with the rotation of the washing brush and the like to the vehicle that has received the injection of the washing agent in the chemical washing machine to wash the vehicle. The chemicals and stains in the process are washed away by spraying water. The water washing unit may perform two or more stages of water washing as necessary. In this case, the final stage water washing unit is referred to as a finishing water washing unit. A silica removal system according to claim 4, wherein a silica removal device that removes impurities such as silica from raw water for car washing by a reverse osmosis membrane method, and a first water tank that stores RO treated water obtained from the silica removal device. And a second water tank for storing the RO concentrated water obtained from the silica removing device together with the raw water supplied to the silica removing device, wherein the water from the second water tank is supplied to a watering and brushing washing section of the car washing device. And supply the RO from the first water storage tank to the water washing section of the car washing device.
We supply treated water. When performing two or more stages of water washing, the RO treated water from the first water storage tank may be supplied only to the finishing water washing unit. In any of the above-mentioned inventions, the water cleaning in the cleaning device can reduce the
Since the O-treated water is used, the silica does not strongly adhere to the window glass and does not cause scale-like cloudiness. The present invention is particularly suitable for use in commercial vehicles with many windows, such as railway vehicles and buses. Is not impaired. In addition, since a polishing operation for removing scale-like stains and a removal operation using chemicals are not required, running costs and the like can be reduced. Further, since the silica removing device, which is a main component of the present invention, removes silica by a reverse osmosis membrane method, it can be configured to be small (space saving) and inexpensive, and can be easily added to an existing cleaning device. Can be. In addition, no special consideration is required for the wastewater treatment, and the RO concentrated water (RO wastewater) can be effectively used in the cleaning device. The silica content of the RO-treated water is generally preferably low, but it has been clarified from the study of the present inventor that if the silica content is 8 ppm or less, no cloudy contamination occurs. 2 content
It is desirable to remove to about 8 ppm.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments. FIG. 1 illustrates an example of a silica removal system according to the present invention, and includes a silica removal apparatus 1 for removing silica from raw water such as tap water and a water storage tank 9 for storing RO treated water. As shown in the figure, the silica removal device 1 includes an activated carbon filtration device 2, a water softening device 3,
Salt water tank 4, guard filter 5, booster pump 6, R
It comprises an O film module 7, an RO system control panel 8 for controlling each part of the apparatus, and the like. Activated carbon filter 2
Is an apparatus that adsorbs and removes free chlorine, organic substances, and the like from raw water such as tap water and well water by utilizing the adsorption capacity of porous activated carbon. The water softener 3 is an activated carbon filter 2
Hardness component (Ca, M)
g). When scale components are concentrated in the RO membrane module 7, calcium ions may be precipitated as calcium carbonate. Therefore, in order to prevent this, the water softening device 3 removes the hardness components in advance.
Although a specific configuration of the water softening device 3 is not particularly limited, the hardness component is captured by the ion exchange resin R based on [Equation 1]. If Na is replaced by Ca or Mg, regeneration is required. Therefore, the salt water tank 4 is provided, and the regeneration operation shown in [Equation 2] is performed appropriately.

[0006]

(Equation 1)

[0007]

(Equation 2)

The RO membrane module 7 is for removing ions and heavy metals from raw water based on the principle of the reverse osmosis membrane method shown in FIG. It is surely removed from the water. As shown in FIG. 2, the principle of the reverse osmosis method (Reverse Osmosis) is that when a dilute solution and a concentrated solution come in contact with each other via a semipermeable membrane,
The solvent on the dilute solution side penetrates into the concentrated solution side (a), and a pressure difference P _O of the osmotic pressure is generated to equilibrate (b). Move to the dilute solution (c). Therefore, the output of the guard filter 5 is pressurized by the booster pump 6 and added to the RO membrane module 7, and the RO treated water 7a and the RO
The concentrated water (RO drainage) 7b is output (FIG. 1). The guard filter 5 protects the RO film by removing fine dust from the raw water supplied from the water softening device 3. Since the silica removing device 1 is configured as described above, not only the hardness component but also the silica component is reliably removed from raw water such as tap water, industrial water, and well water. Then, the RO treated water is stored in the reservoir 9, and a required amount is output by the water supply pump 10. In an emergency, the emergency valve V is opened and the raw water is supplied, so that the water storage tank 9 does not become empty. FIG. 3 shows the results of the treatment by the silica removing device 1 with respect to two raw waters.

FIG. 4 illustrates a car washing apparatus using the silica removal system shown in FIG. The car washing device shown in FIG. 4 includes a chemical washing machine 11 and a fresh water washing machine 12, and the fresh water washing machine 12 uses RO treated water. At the time of washing a railway car or the like, the chemical washing machine 11 uses a chemical nozzle 11a.
The medicine is washed by the medicine from
According to the rotation of the cleaning brush 12a of the fresh water cleaning machine 12,
Rinsing is performed by the RO treated water from the fresh water nozzle 12b, and further, water cleaning is performed by the RO treated water from the cleaning water nozzle 12c. It has been confirmed that the silica removing device 1 removes 90% or more of ionic silica.
In addition, since the fluctuation of the removal rate is small, even if water having a silica content of 40 ppm is used, RO-treated water having a silica content of 4 ppm or less can be obtained.
There is no cloudiness on the window glass of railway vehicles. In addition, if the silica content is 8 ppm or less, white turbid staining (white haze) does not occur even after repeated car washing.

FIG. 5 shows an embodiment in which the RO treated water from the silica removing device 1 is used only in the water washing by the washing water nozzle 12c. In this embodiment, R
A water tank 9A for storing tap water and the like is required separately from the water tank 9 for the O-treated water. However, since the RO concentrated water 7b output from the silica removing device 1 can be stored in the water tank 9A, Can be used effectively. Further, since the consumption amount of the RO treated water is smaller than that of the apparatus shown in FIG. FIG. 6 shows an embodiment in which water cleaning is performed in two stages, and RO treated water is used only for the final finishing cleaning. Also in the case of this embodiment, tap water and the like can be used effectively, and the consumption of RO treated water is small, so that running costs can be reduced. 5 and 6, water containing silica is used at the time of liquid cleaning. However, when impurities in water droplets remaining on the glass surface are concentrated and condensed and crystallized, the crystal on the glass surface is firmly bonded to the crystal. Because it is thought to stick to
Since the washing water in the former stage is washed away by using the RO treated water as the finishing water, and only the RO treated water remains on the glass surface,
There is no cloudiness on the window glass.

[0011]

As described above, in the car washing method according to the present invention, since water for washing the car from which silica has been removed is used, scale-like white turbid stains do not occur on window glasses of railway cars and the like. Therefore, there is no need for the cost of polishing the glass surface or replacing the glass, and also has the effect of extending the life of the gloss of the coating of the outer plate, so that the maintenance and management costs of the railway vehicle can be suppressed.
Since the silica removal system according to the present invention uses the reverse osmosis membrane method, the cost for wastewater treatment as in the case of the ion exchange method is not required, and the RO concentrated water can be effectively used. Further, the silica removal system according to the present invention,
Since it is small and inexpensive, and can be incorporated into an existing vehicle cleaning device simply by changing the piping, the existing railway vehicle cleaning device can be easily upgraded in quality.

[Brief description of the drawings]

FIG. 1 illustrates an example of a silica removal system according to the present invention.

FIG. 2 illustrates the principle of the reverse osmosis membrane method.

FIG. 3 illustrates the performance of the silica removing apparatus of FIG. 1;

FIG. 4 is a block diagram showing a state in which the silica removal system of the present invention is connected to a car wash device.

FIG. 5 is another block diagram showing a state in which the silica removal system of the present invention is connected to a car wash device.

FIG. 6 is still another block diagram showing a state in which the silica removal system of the present invention is connected to a car wash device.

FIG. 7 illustrates the quality of car wash water for a railway vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Silica removal apparatus 9 Water storage tank 12a Cleaning brush (sprinkling brushing washing part) 12b Fresh water nozzle (sprinkling brushing washing part) 12c Washing water nozzle (water washing part) 12d Finishing water nozzle (finishing water washing part)

Claims (7)

(57) [Claims] 1. A car washing apparatus comprising: a silica removing device for removing impurities such as silica from raw water for car washing by a reverse osmosis membrane method; and a water storage tank for storing RO treated water obtained from the silica removing device. A car washing method for a commercial vehicle, wherein the RO treated water from the water storage tank is supplied to a brushing washing section and a subsequent water washing section. 2. The car washing method according to claim 1, wherein the vehicle is a commercial vehicle having many windows such as a railway vehicle and a bus. 3. A car washing apparatus comprising: a silica removing device for removing impurities such as silica from raw water for car washing by a reverse osmosis membrane method; and a water storage tank for storing RO treated water obtained from the silica removing device. A silica removal system configured to supply the treated RO water from the water storage tank to a brushing cleaning unit and a subsequent water cleaning unit. 4. A silica removing device for removing impurities such as silica from raw water for car washing by a reverse osmosis membrane method, a first water storage tank for storing RO treated water obtained from the silica removing device, and the silica removing device. A second water tank for storing the RO concentrated water obtained from the silica removing device together with the raw water supplied to the car washing device, and supplying the water from the second water tank to a watering and brushing washing section of the car washing device, A silica removal system configured to supply the RO treated water from the first water storage tank to the water washing unit of (1). 5. The silica removal system according to claim 4, wherein the RO treated water from the first water storage tank is supplied only to the finishing water washing section which is the last stage of the water washing section. 6. The silica removal system according to claim 3, wherein the silica removal device removes silica in raw water to a content of about 8 ppm or less by a reverse osmosis membrane method. 7. The silica removal system according to claim 3, wherein the RO treated water is used for washing a commercial vehicle having a large number of window glasses such as a railway vehicle or a bus.