JPH10297440A - Reutilizing system for washing waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reutilize washing waste water in the state near a closed cycle by separating and removing an oil component and an ionized object such as wax mixed or dissolved in various washing waste water with an electrolytic coagulation device, storing the generated washing water in a tank, and feeding it to various washing devices. SOLUTION: The waste water W after washing by various washing devices 1 such as an automatic car washing device and a manual washing means 2 is stored in a sub-tank 3. The washing waste water W is fed to an electrolytic coagulation tank 6 constituting an electrolytic coagulation device D via a strainer 4 and a sump pump 5. A pair of an electrode 6-1 made of an aluminum sheet and an electrode 6-2 made of an steel sheet in the electrolytic coagulation tank 6 are excited, the oil component forms aluminum salt and is coagulated, precipitated, and separated, and an ionized object is stuck and coagulated to purify the water W. The purified supernatant water is stored in a washing water tank 9 and is reutilized in various washing devices 1. Water is saved, and the cost is sharply reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for treating wastewater generated during cleaning of various vehicles, various storage tanks, various containers, and various devices, such as oil removal. Further, the present invention relates to a washing wastewater recycling system for reusing washing wastewater purified by the above-mentioned wastewater treatment technology as washing water.

[0002]

2. Description of the Related Art Dirt from railway cars, buses, trucks, passenger cars, etc. is washed by a car washer or by hand. Drained. In addition, tanks and containers for storage, such as oil tanks and containers, are washed at the time of reuse, and the wastewater is similarly treated to a level below the regulation, and then all is drained.

[0003] However, tap water or groundwater used for such washing is increasing year by year due to the development of a car society and the development of industry, and enormous water resources are consumed. In recent years, during the summer drought season, the impact is large and it is a major cause of water shortage. The massive consumption of these water resources has led to an increase in water resources development and has led to the destruction of the natural environment. Even though most of the wastewater is treated, it is one of the polluting factors as a load of water pollution in rivers, lakes, marshes and closed sea areas.

[0004] On the other hand, a large amount of tap water for cleaning and sewage treatment water for drainage is a large expense burden for a washing company, and the consumer bears the fee or the amount of consumption in some form. Under such circumstances, it has been considered that this washing wastewater is recovered and reused, and has already been proposed, for example, in Japanese Patent Application Laid-Open Nos. 52-137160 and 60-166079. That is, the washing wastewater is put into a sedimentation tank to separate solids such as earth and sand, and a coagulant is added to the supernatant water to coagulate and separate oils or the like, or adsorbed by an oil filter, and the washing wastewater is reused as washing water. What you want to do.

[0005]

By the way, in the method for treating washing wastewater as proposed above, for example, when used for washing a car such as a passenger car, it is emulsified and mixed into the washing wastewater after washing with a detergent or after waxing. Detergent and wax cannot be separated and removed. Therefore, if this treated wastewater is reused as washing water, the fats and oils of the wax and stains of the washing components adhere to the windows and the vehicle body after washing, so that they have not been completely reused.

[0006] Even in the case of reuse, the detergent is merely reused for mixing the detergent, and the reuse rate is at most 30 to 40.
Only%. In addition, solid contaminants of the order of several hundred microns cannot be sufficiently separated or removed, or organic substances cannot be separated and removed. At present, there is almost no reuse of washing wastewater in the general society.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended to remove ionized substances such as oil and wax mixed or dissolved in various kinds of washing wastewater. Another object of the present invention is to provide a cleaning wastewater recycling system configured to generate cleaning water by separating and removing the same in an electrolytic flocculation apparatus, store the cleaning water in a tank, and supply the cleaning water to various cleaning apparatuses.

[0008] After various solid wastes are separated and removed in a wastewater pit, various kinds of washing wastewater are supplied to an electrolytic flocculation device through a liquid cyclone. In this electrolytic flocculation device, ionized substances such as oil and wax mixed or dissolved in the washing wastewater are removed. An object of the present invention is to provide a cleaning wastewater recycling system configured to generate cleaning water by separating and removing the same, store the cleaning water in a tank, and supply the cleaning water to various cleaning apparatuses.

Further, it is preferable to arrange an activated carbon filter for adsorbing and removing BOD components such as organic substances mixed in various kinds of washing wastewater in a tank for storing the washing water. The electrolytic coagulation apparatus comprises a tank for accommodating washing wastewater, a plurality of pairs of electrodes consisting of an aluminum plate electrode plate and an iron plate electrode arranged in the tank, and a load voltage control panel for supplying power to the electrodes. doing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a basic example of a washing wastewater recycling system according to the present invention will be described with reference to FIG. 1, and an embodiment in a car washing apparatus such as a car will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes various cleaning devices such as an automatic car washing device, and 2 denotes a manual cleaning unit by hand-washing. Wastewater W after cleaning is collected in a sump tank 3 via a cleaning wastewater pipe L1.

The washing wastewater W is supplied from the sump tank 3 to the electrolytic coagulation tank 6 constituting the electrocoagulation apparatus D via the strainer 4, the pipe L2, the sump pump 5, and the pipe L3. In this electrolytic coagulation tank 6, a required number of electrodes having a pair of an aluminum plate electrode 6-1 and an iron plate electrode 6-2 are installed in parallel, and these electrodes are energized by a load voltage control panel 7. As a result, aluminum ions are eluted from the electrode 6-1 into the washing wastewater. Due to the action of the eluted aluminum ions, impurities such as oils in the washing wastewater form aluminum salts, coagulate, precipitate and separate, and at the same time, purify the washing wastewater by adhering and coagulating ionized substances on the electrode 6-2 made of an iron plate. .

The supernatant water thus purified is supplied from the electrolytic flocculation tank 6 to the pipe L4, the storage pump 8, and the pipe L.
The washing water is stored in the washing water tank 9 through the pipeline composed of the washing water. The washing water stored in the washing water tank 9 is provided to the various washing apparatuses 1 and the manual washing 2 via the pipe L6 or L7, and is reused in a car wash or the like. In the present invention, all of the washing wastewater is reused as washing water. However, since the amount of water that is splashed or adhered to the object to be washed during washing is gradually reduced, tap water is supplied from the pipe L8 through the float valve 10. It is replenished by the reduced amount.

The sump tank 3 is installed at a position lower than the floor of the washing point, and other equipment, tanks and connecting pipes can be unitized according to the amount of washing water.
Next, with reference to FIG. 2, an embodiment in a car wash of a vehicle will be described. Car wash wastewater W from the automatic car wash apparatus 1a or the manual car wash 2a is collected in the wastewater pit 20 via the washing wastewater pipe L10. The wastewater pit 20 precipitates and separates a large and heavy solid foreign matter and floats and separates an oil component. The washing wastewater thus gravity-separated is subjected to strainer 21,
It is pressurized by the sump pump 22 through the suction pipe L11 and supplied to the liquid cyclone 23 to separate fine solids.

In the liquid cyclone 23, all solid contaminants of 15 microns or more are separated and removed, and discharged to a wastewater pit 20 via a drain line (not shown). The clean water W1 from which solids have been removed as described above is
After being temporarily stored in the storage tank 24 via 13, it is automatically transferred to the electrode aggregation tank 25 side constituting the electrolytic aggregation apparatus D by overflow. In the electrolytic coagulation tank 25, a plurality of pairs of the electrodes 6a having the above-described configuration are arranged at predetermined intervals, and power is supplied from a load voltage control panel (not shown).

Oil such as wax and ionized impurities are coagulated and separated in the electrode coagulation tank 25, and the purified water W2 treated in the electrolytic coagulation tank 25 is further filtered by a filter pump 26 via a pipe L14 by an activated carbon filter. The filter 27 removes impurities such as organic substances and becomes the car wash water W3, and is stored in the car wash water tank 28 via the pipe L15. The car wash water W3 in the wash water tank 28 is supplied to the automatic car washer 1a or the manual car wash 2a via the pipe L16 or the pipe L17 to be used for cleaning a vehicle or the like.

By treating the car wash wastewater W in a series of steps as described above, various impurities mixed in various washings are completely removed, so that even if the carwash wastewater W is reused as the car wash water W3, A clean car wash that is the same as before can be performed. However, the amount of water splashed or attached to the vehicle body during car washing is in short supply, so tap water / ground water W4 is supplied from the pipe L18 via the float valve 29.

The wastewater pit 20 is generally installed at a position lower than the floor of the car wash. Further, a series of devices such as the illustrated pumps and devices and various tanks are installed on a common base plate to form a unit. If the wastewater pit 20 cannot be installed at a low position where carwash wastewater can flow,
It is also possible to make a unit together with the various tanks.

If the object to be cleaned is extremely contaminated, the above series of devices may not be able to sufficiently clean the object, so that the sand filter 30 can be additionally installed as an option. In addition, calcium or the like is largely dissolved in tap water or ground water, and spots or stripes may be formed after washing and drying. In such a case, the RO water treatment apparatus 31 is added to the tap water or ground water. Install and remove the calcium etc., replenish the clean water, stain after washing and drying,
It is good to remove the stripe pattern.

Since the capacity of the activated carbon filter 27 and the sand filter 30 gradually decreases during use, the cleaning life can be extended by performing regular backwashing. Although not shown, all the impurities separated and precipitated in each tank are collected in the wastewater pit 20 via a drain line, and after a certain period of time, removed by a vacuum truck or the like, and subjected to necessary processing.

Accordingly, the amount of tap water / ground water used is reduced,
That is, it is possible to save a large amount of washing water. By the way, in the embodiment of the reuse system of the car wash wastewater, if the amount of water consumed by splashing or adhering to the vehicle body is assumed to be 5% of the wash water, the washing can be performed with the supply of tap water / ground water of 5% corresponding to that amount. Of 95
% Can be reused (recycled).

[0021] Accordingly, although various types of washing wastewater have been conventionally treated as sewage, a large amount of tap water or 95% of groundwater drained into rivers and sewers can be recovered and reused, thereby saving enormous amounts of water resources. It will save water. By saving a large amount of tap water or groundwater consumption during the whole year, it is possible to avoid summer droughts that frequently occur in recent years, and also to avoid the impact on ordinary citizens' lives.

By saving a large amount of these water resources, the environment can be protected by reducing or stopping the development of new water resources accompanying the destruction of the natural environment. Reduction of washing wastewater to rivers, lakes and marshes and closed seas will make a great contribution to the prevention of water pollution. On the other hand, large-scale consumer washing companies that handle sewage treatment of tap water and wastewater for cleaning use 9
Various effects can be expected by implementing the present invention, such as a 5% saving of water, which leads to a great cost reduction and a great advantage in management.

[0023]

As is apparent from the above description, according to the washing wastewater recycling system of the present invention, the supernatant water obtained by coagulating and separating the oil and ionized substances contained in the washing wastewater is used for the car washing. Activated carbon removes detergents used during cleaning, organic substances such as earth and sand, dust, etc. attached to the vehicle, and odors of chemicals, etc., so that washing wastewater should be efficiently reused in a complete closed cycle or a state close to this. Can be done.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a car wash wastewater recycling system according to the present invention.

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

[Explanation of symbols]

1,1a Various cleaning devices 2,2a Manual cleaning
3 Sump tank 4 Strainer 5 Sump pump 6 Electrolytic coagulation tank 6-1 Aluminum plate electrode 6-2 Iron plate electrode
7 Load voltage control panel 8 Storage pump 9 Wash water tank 10 Float valve 20 Wastewater pit 21 Strainer 22 Sump pump 23 Hydrocyclone 24 Storage tank 2
5 Electrolytic coagulation tank 26 Filter pump 27 Activated carbon filter
28 Car wash water tank 29 Float valve 30 Sand filter 31
RO membrane processing equipment

Claims (4)

[Claims] 1. An electrolytic flocculation device separates and removes ionized substances such as oil and wax mixed or dissolved in various cleaning wastewater to generate cleaning water, and stores the cleaning water in a tank to be used in various cleaning devices. A cleaning wastewater recycling system configured to supply. 2. After washing and separating various kinds of washing wastewater in a wastewater pit, a solid mixture is supplied to an electrolytic coagulation device through a liquid cyclone, and ionized substances such as oil and wax mixed or dissolved in the washing wastewater in the electrolytic coagulation device. A cleaning water reuse system configured to generate cleaning water by separating and removing the cleaning water, store the cleaning water in a tank, and supply the cleaning water to various cleaning apparatuses. 3. The cleaning wastewater recycling system according to claim 1, wherein an activated carbon filter for adsorbing and removing BOD components such as organic substances mixed in various types of cleaning wastewater is disposed in a tank for storing the cleaning water. 4. A system according to claim 1, comprising a plurality of arrays of a pair of electrodes made of an aluminum plate and an iron plate in a tank containing the washing wastewater, and a load voltage control panel for supplying power to the electrodes. 3. The electrolytic coagulation apparatus according to 2.