JPH09226537A - Car washing method and silica removing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve car washing water, and realize reliable car washing work without causing environmental pollution in a problem by using RO treated water from which impurity such as silica is removed by a reverse osmotic membrane method at least in a water cleaning process. SOLUTION: A car washing method and a silica removing system are composed of a silica removing device 1 to remove silica from raw water such as service water and a storage tank 9 to store RO treated water. The silica removing device 1 is composed of an activated carbon filtering device 2, a water softener 3, a salt water tank 4, a guard filter 5, a booster pump 6, an RO film module 7, an RO system control board 8 to control respective parts of the device or the like. The RO membrane module 7 is formed to remove the ion content and the heavy metal content or the like from raw water on the basis of the priciple of a reverse osmotic membrane method, and can reliably remove silica harmful to window glass from car washing water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car wash method for washing a railroad vehicle or the like using pure water from which impurities such as silica have been removed, and a car wash 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 the window glass of a railroad vehicle has already been contaminated, fluorine-based chemicals are used to dissolve and remove the deposits on the glass surface, or strong acidic chemicals are used to remove the deposits. A method of melting and removing it, polishing an adhered substance by a polishing compound and scraping it off, or replacing a contaminated glass with a new glass is adopted. Then, even after the window glass is restored to a transparent state (a state where there is no cloudiness and stain), the railway vehicle is washed as a continuous operation. As car wash water, industrial water, well water, and tap water are used exclusively.
For example, the data as shown in FIG. 7 is obtained.

[0003]

As a result of various studies conducted by the present inventor on the influence of car wash water having the water quality as shown in FIG. 7 on a railway vehicle, the following problems have become apparent. First, the iron and manganese components may oxidize and cause red rust or black stains to adhere to the vehicle body.
The component (g, Ca) has a problem that white powdery residue remains attached and is not removed until the next cleaning. In addition, silica (Si that dissolves ionically in car wash water
O ₂ ) leaves a drop-shaped white deposit on the window glass, but since silica has the same component as glass and has a strong binding force, it cannot be removed by the next cleaning and accumulates after each cleaning operation. As a result, scale-like cloudy stains occur, and finally the window glass becomes cloudy like "frosted glass". These problems are caused by the quality of the water used for washing, so even if the water drops remaining on the glass surface after car washing are wiped off, or even if they are blown off by compressed air or a fan, a fundamental solution Does not mean There is also a method of removing silica by an ion exchange method, but when removing silica by an ion exchange method, there is no choice but to use hydrochloric acid or caustic soda for resin regeneration and cleaning, so there is a problem of environmental pollution due to waste water. However, there is a problem that wastewater treatment requires extra equipment and costs. The present invention is based on these considerations, to improve the car wash water without making environmental pollution a problem, to provide a silica removal system for car wash water that can realize a reliable car wash work, Also, it is an object of the present invention to provide a car wash method that realizes a high-performance car wash using this system.

[0004]

In order to achieve the above-mentioned object, a car washing method according to a first aspect of the present invention comprises a chemical washing step of injecting a chemical for washing, and water is jetted in accordance with the rotation of a washing brush or the like. In a car washing method comprising a sprinkling brushing washing step of washing a vehicle with water and a water washing step of washing out chemicals and dirt in the previous step by spraying water, at least in the water washing step, silica etc. by a reverse osmosis membrane method. RO (Reverse Osmosis) treated water obtained by removing the impurities is used. Further, the silica removing system according to claim 3 is 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 tank for storing RO-treated water obtained from the silica removing device. And the RO treated water from the water storage tank is supplied to the sprinkling brushing cleaning section and the water cleaning section of the car wash device. The car wash device typically includes a chemical washing machine and a fresh water washing machine, and the fresh water washing machine includes a sprinkling brush washing section and a water washing section. Here, in the sprinkling brushing cleaning unit, the vehicle that has been sprayed with the cleaning chemicals in the chemical washer is sprayed with water in accordance with the rotation of the cleaning brush to wash the vehicle. Rinse away chemicals and dirt in the process by spraying water. In addition,
The water cleaning section may perform water cleaning in two or more stages, if necessary. In this case, the final stage water cleaning section is called a finishing water cleaning section. The silica removal system according to claim 4,
A silica removing device for removing impurities such as silica from car wash raw water by a reverse osmosis membrane method, a first water storage tank for storing RO-treated water obtained from the silica removing device, and raw water supplied to the silica removing device And a second water storage tank for storing RO concentrated water obtained from the silica removal apparatus, and supplies water from the second water storage tank to the water spray brushing cleaning section of the car wash apparatus to supply water to the water cleaning section of the car wash apparatus. The RO treated water from the first water tank is supplied.
When performing water washing in two or more stages, 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, since the RO-treated water is used for washing with water in the washing device, silica does not adhere strongly to the window glass to cause scale-like cloudiness and stain. INDUSTRIAL APPLICABILITY The present invention is particularly suitable for use in commercial vehicles such as railroad cars and buses that have many window glasses. There is no loss of
Further, since the polishing work for removing the scale-like stain and the removing work with a chemical are unnecessary, the running cost and the like can be reduced. Further, since the silica removing device, which is a main component of the present invention, removes silica by the reverse osmosis membrane method, it can be constructed in a small size (space saving) and at a low cost, and can be easily added to an existing cleaning device. You can Moreover, no special consideration is required for wastewater treatment, and RO
Since concentrated water (RO waste water) can be effectively used in the cleaning device, it is also excellent in this respect. Generally, it is preferable that the silica content of the RO-treated water is low, but it has been clarified from the study of the present inventor that the silica content of 8 ppm or less does not cause cloudiness and contamination. It is desirable to remove the content to about 2 to 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 the silica removal system of the present invention, which is composed of a silica removal apparatus 1 that removes silica from raw water such as tap water, and a water storage tank 9 that stores RO-treated water. As shown in the figure, the silica removing device 1 includes an activated carbon filtering device 2, a water softening device 3,
Salt water tank 4, guard filter 5, booster pump 6, R
It is composed of an O membrane module 7 and an RO system control panel 8 for controlling each part of the apparatus. Activated carbon filtration device 2
Is a device that adsorbs and removes free chlorine and organic substances from raw water such as tap water and well water by utilizing the adsorption capacity of porous activated carbon. The water softening device 3 is the activated carbon filtration device 2
From the treated water of, the hardness component (Ca, M
It is a device for removing g). If the scale component is 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 component in advance.
The specific configuration of the water softening device 3 is not particularly limited, but the hardness component is captured by the ion exchange resin R based on [Equation 1]. Note that if Na is replaced with Ca or Mg, regeneration is necessary. Therefore, the salt water tank 4 is provided and the regeneration work shown in [Equation 2] is appropriately performed.

[0006]

[Equation 1]

[0007]

[Equation 2]

The RO membrane module 7 removes ions and heavy metals from raw water based on the principle of the reverse osmosis membrane method shown in FIG. It is reliably removed from the water. As shown in the principle of reverse osmosis in Fig. 2, when a dilute solution and a concentrated solution contact each other across a semipermeable membrane,
The solvent of the dilute solution side penetrates to the concentrated solution side (a), although equilibrium a pressure differential P _O osmotic pressure (b), whereas the solvent the addition of the pressure P on the osmotic pressure or a concentrated solution side Move to dilute solution (c). Therefore, the output of the guard filter 5 is pressurized by the step-up pump 6 and added to the RO membrane module 7. From the RO membrane module 7, the RO treated water 7a and RO
The concentrated water (RO waste water) 7b is output (FIG. 1). The guard filter 5 protects the RO membrane 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 surely removed from raw water such as tap water, industrial water and well water. Then, the RO-treated water is stored in the water storage layer 9, and the required amount is output by the water feed pump 10. Further, in an emergency, the emergency valve V is opened and the raw water is supplied, so that the water storage tank 9 will not become empty. It should be noted that FIG. 3 illustrates the treatment result by the silica removing apparatus 1 for two raw waters.

FIG. 4 shows a car wash 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 car washing of a railroad vehicle, etc.
The drug from the
According to the rotation of the cleaning brush 12a of the clean water washer 12,
It is washed away with the RO-treated water from the clean water nozzle 12b, and is further washed with the RO-treated water from the wash water nozzle 12c. It has been confirmed that 90% or more of ionic silica is removed by the silica removing device 1,
Moreover, since the fluctuation of the removal rate is small, for example, 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 clouding stain on the window glass of railway cars. If the silica content is 8 ppm or less, white turbidity (white cloudiness) does not occur even after repeated car washing.

FIG. 5 shows an embodiment in which the RO-treated water from the silica removing apparatus 1 is used only for water washing with the washing water nozzle 12c. In the case of this embodiment, R
A water storage tank 9A for storing tap water or the like is required in addition to the water storage tank 9 for O-treated water, but the RO concentrated water 7b output from the silica removing apparatus 1 can be stored in the water storage tank 9A. Can be effectively used. Further, since the consumption amount of RO-treated water is smaller than that of the apparatus shown in FIG. 4, it is economical to install a small capacity silica removing apparatus. FIG. 6 shows an example in which the water cleaning is performed in two stages and the RO treated water is used only for the final finishing cleaning. Also in the case of this embodiment, tap water or the like can be effectively used and the consumption of RO-treated water is small, so that the running cost can be reduced. 5 and 6, water containing silica is used during the liquid washing, but when the impurities in the water droplets remaining on the glass surface are condensed and condensed to crystallize, they firmly adhere to the crystals on the glass surface. It is thought that it will stick to
By using RO treated water as the finishing water, the washing water in the previous stage is washed away and only the RO treated water remains on the glass surface.
No turbid stain on the window glass.

[0011]

As described above, in the car washing method according to the present invention, the car wash water from which silica is removed is used, so that the scale-like cloudiness of the window glass of a railway vehicle does not occur. Therefore, the cost of polishing the glass surface and the cost of replacing the glass are not required, and the effect of extending the luster of the coating of the outer panel is also extended.
Since the silica removal system according to the present invention uses the reverse osmosis membrane method, the expense for wastewater treatment unlike the case of the ion exchange method is unnecessary, and the RO concentrated water can be effectively used. Further, the silica removal system according to the present invention,
It is small and inexpensive, and since it can be incorporated into an existing vehicle cleaning device simply by changing the piping, it is possible to easily improve the quality of the existing railway vehicle cleaning device.

[Brief description of 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 removal device of FIG.

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 removing system of the present invention is connected to a car wash device.

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

[Explanation of symbols]

 1 Silica Removal Device 9 Water Tank 12a Cleaning Brush (Sprinkling Brushing Cleaning Section) 12b Fresh Water Nozzle (Sprinkling Brushing Cleaning Section) 12c Cleaning Water Nozzle (Water Cleaning Section) 12d Finish Water Nozzle (Finishing Water Cleaning Section)

Claims (7)

[Claims] 1. A chemical washing step of injecting a cleaning agent onto a vehicle, a water spray brushing washing step of injecting water according to the rotation of a cleaning brush to wash the vehicle, and a pre-step by injecting water. In the car washing method, which comprises a water washing step of washing away the chemicals, dirt, etc., RO treated water obtained by removing impurities such as silica by a reverse osmosis membrane method is used at least in the water washing step. Car wash method. 2. The car wash method according to claim 1, wherein the vehicle is a commercial vehicle such as a railroad vehicle or a bus with a lot of window glass. 3. A sprinkler for a car wash device, comprising a silica removal device for removing impurities such as silica from raw water for car wash by a reverse osmosis membrane method, and a water tank for storing RO-treated water obtained from the silica removal device. A silica removal system adapted to supply RO-treated water from the water storage tank to a brushing cleaning section and a subsequent water cleaning section. 4. A silica removing device for removing impurities such as silica from raw water for car washing by a reverse osmosis 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 the sprinkling brushing and washing section of the car washing device. A silica removal system adapted to supply the RO-treated water from the first water storage tank to the water cleaning section. 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 final water cleaning section, which is the final stage of the water cleaning section. 6. The silica removing system according to claim 3, wherein the silica removing device removes silica in the raw water to a content rate of about 8 ppm or less by a reverse osmosis membrane method. 7. The silica removing system according to claim 3, wherein the RO-treated water is used for cleaning a commercial vehicle such as a railroad car or a bus that has a lot of window glass.