JP2002166268A - Drainage purifying equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage purifying equipment with an excellent water purification efficiency and a sufficient water quality improvement effect. SOLUTION: This drainage purifying equipment is provided with a water storage tank 2 where a treated water is stored, a water collection tank 3 where a drainage after a car is washed by a car wash 1 using the treated water in the storage tank 2 is stored, a flotation and separation type purifying equipment 4 in which a coagulant is added from a chemical feeder 19 to the drainage pumped up from the water collection tank 3 and a suspended matter is floated and separated by fine bubbles supplied from a fine-bubble generator 20, and an ionization tank 6 in which an activated carbon vessel 5 and a granular ionizing material are accommodated, and a primary treated water purified in the purifying equipment 4 is allowed to pass through the activated carbon vessel 5 and the ionization tank 6 in series and the treated water which has passed through the ionization tank 6 is returned to the water storage tank 2 where it is reutilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an apparatus for purifying wastewater.

[0002]

2. Description of the Related Art For example, car washing machines are often used for washing automobiles. In this case, the amount of water used is one hour per hour.
Tons and a large amount of contaminated water is generated. Conventionally, the wastewater after car washing has been discharged to the sewer, and as a result of the large amount of contaminated water flowing into the sewer, the load of sewage treatment increases, and in addition, detergents are contained, and environmental protection is also involved. Was to leave a problem. In addition, tap water is usually used for car washing with this car washer, leaving a large problem in terms of effective use of water resources, and a large burden on costs.

[0003]

Therefore, recently, various studies have been made to purify and reuse wastewater after car washing.
However, if an existing purifying device such as a pressurized flotation type purifying device is simply applied to purify the wastewater after the car washes, it is reasonable in terms of removing pollutants, that is, purifying water. Although an effect can be obtained, there is a problem that the effect on the improvement of water quality can hardly be expected, and it is not sufficient to reuse tap water.

[0004] The present invention has been made in view of the above background, and an object of the present invention is to provide a wastewater purifying apparatus which is excellent in water purification efficiency and has a sufficient water quality improvement effect.

[0005]

According to a first aspect of the present invention, an activated carbon tank and an ionization tank are provided, and waste water is supplied to the activated carbon tank and the ionization tank. It is characterized in that it is continuously circulated. In the waste water purifying apparatus configured as described above, the pollutants contained in the waste water are adsorbed and removed by the activated carbon in the activated carbon tank, and then ionized while passing through the ionization tank to improve the water quality. In this case, the ionization tank may be configured to contain a granular ionized material. As such an ionizing material, there is an ore fired material containing weathered granite as described in, for example, JP-A-8-173948. By using such an ionizing material, the ionization tank can be made compact. . The first invention further includes a primary purification unit for removing suspended substances contained in the wastewater, and a configuration in which the primary treated water purified by the primary purification unit is continuously circulated through the activated carbon tank and the ionization tank. You can also. By additionally providing such a primary purification means, suspended substances in the wastewater are temporarily removed, and the purification efficiency is further increased. In this case, as the primary purifying means, a pressurized flotation type purifying device that mixes a chemical into the drainage and generates microbubbles to float and separate the suspended substance can be adopted, and thereby, is included in the drainage. Removal of the detergent is also possible.

A second invention for achieving the above object is:
A water tank for storing washing water as described in claim 5,
A water collecting tank for storing the waste water after cleaning the equipment using the cleaning water in the water storage tank, and mixing the chemical into the waste water pumped from the water collecting tank and generating fine bubbles to float and separate suspended substances. A pressurized flotation-type purifier, an activated carbon tank and an ionization tank containing granular ionized material are provided, and the primary treated water purified by the pressurized flotation-type purifier is continuously supplied to the activated carbon tank and the ionization tank. And the treated water that has passed through the ionization tank can be returned to the water storage tank. In the wastewater purification device configured as described above, after the wastewater after washing the device accumulates in the water collection tank, the wastewater passes through the pressurized floating separation type purification device, the activated carbon tank, and the ionization tank in order, and returns to the water storage tank. By the action described above, it is sufficiently purified to a level that can be reused and the water quality is improved, thereby establishing a recycling system for wastewater after washing equipment. In the second aspect of the present invention, it is desirable to connect a water pipe to the above-mentioned water storage tank so that the shortage of the treated water is supplemented by the tap water, thereby stably using the wastewater after washing the equipment as a recycling system. Becomes possible. Further, it is preferable that the pressure-floating-separation-type purifying device is provided with a scum removing means for overflowing the floating scum and discharging the scum to the outside of the device, so that the operation for removing the scum is unnecessary. Become.

According to the second aspect of the present invention, a back washing circuit may be provided for each of the activated carbon tank and the ionization tank so that a washing medium is circulated in a direction opposite to the direction in which the waste water is purified. By providing the backwashing circuit in this manner, the activated carbon and the ionized material can be quickly regenerated by feeding back tap water as needed. In the second invention, a configuration is further provided in which a retained water circulating circuit for circulating retained water in the pressurized flotation-type purification device is provided in a state in which the supply of the drug in the pressure-flotation type purification device is stopped. Can be. By providing the accumulated water circulation circuit in this way, even in the case where the operation is stopped for a long time, the accumulated water is circulated while generating suspended bubbles by generating fine bubbles to prevent foreign matter sedimentation and generation of an odor. Can be prevented.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a waste water purifying apparatus as one embodiment of the present invention. The present embodiment is configured as a recycling system that purifies and reuses wastewater from a car washer 1, a water storage tank 2 that stores washing water supplied to the car washer 1, and a wastewater that has been washed by the car washer 1. A water-collecting tank 3 for storing water, a pressurized flotation-type purifying device (primary treatment means) 4 for mixing a chemical into drainage pumped from the water-collecting tank 3 and generating fine bubbles to float and separate suspended substances; It is schematically composed of an activated carbon tank 5 and an ionization tank 6.

The pressurized flotation type purifying apparatus 4 includes a coagulation reaction tank 11, a flotation separation tank 12, and a tank unit 10 in which a separation water tank 13 and a treatment water tank 14 are connected. The tank 11 and the floating separation tank 12 can overflow on the upper side, the floating separation tank 12 and the separation water tank 13 can flow on the lower side, and the separation water tank 13 and the treatment water tank 14 can flow on the upper side. It is installed continuously. In the flocculation reaction tank 11, drainage is pumped from the water collecting tank 3 by a pump 15 through a pipe 16, while treated water (primary treated water) in a treated water tank 14 is pumped by a pump 17 to the activated carbon tank 5 through a pipe 18. It is to be fed. The pressurized flotation type purification device 4 also includes a drug supply device 19 for supplying a drug into the pipe 17 and a fine bubble generation device 20 for supplying fine bubbles to the agglutination reaction tank 11 and the flotation tank 12. ing.

The chemical supply device 19 includes a first chemical solution tank 21 containing polyaluminum chloride and a second chemical solution tank 22 containing sodium hydroxide, and a mixing device 23 interposed in the pipe 16. The first and second
Pumps 24 and 25 are provided for pumping a medicine (coagulant) from the chemical liquid tanks 21 and 22 to the mixing device 23. The microbubble generator 20 includes a pressurizing pump 26 for taking in the separated water from the separating water tank 13 and pressurizing the same, and a gas-liquid for separating fine bubbles from the liquid pressurized by the pressurizing pump 26. A separation tank 27 and a pressure regulating valve 28 are provided.

In the pressure-floating-separation-type purifying apparatus 4 described above, the coagulant is mixed in the wastewater pumped from the water collecting tank 3 to the coagulation reaction tank 11 by the pump 15 from the chemical supply device 19 during the pumping. Then, the wastewater containing the flocculant flows from the flocculation reaction tank 11 to the flotation tank 12, during which the suspended matter is flocculated by the floc generated by the flocculation reaction, and the floc that flocculates the suspended substance is removed. The fine bubbles supplied from the fine bubble generator 20 adhere to the fine bubbles and float as scum 29, and the wastewater is temporarily purified. On the other hand, wastewater that has been primarily purified (primary treated water)
Flows from the lower part of the floating separation tank 12 into the separation water tank 13, a part of which flows to the fine bubble generator 20, and the majority of the water flows from the upper part of the separation water tank 13 to the treatment water tank 1
4 and stored in the treated water tank 14. Thus, in the present embodiment, a V-shaped scum discharge gutter (scum discharge means) 30 is disposed above the flotation / separation tank 12, and the V-shaped scum discharge gutter (scum discharge means) rises to the upper part in the flocculation reaction tank 11 and the flotation / separation tank 12. The scum 29 overflows into the scum discharge gutter 30 and is discharged outside the apparatus. In addition,
FIG. 1 shows an arrangement in which the scum discharge gutter 30 extends in a direction perpendicular to the paper surface.

The primary treated water stored in the treated water tank 14 is supplied to the inlet 5a of the activated carbon tank 5 through the pipe 18 by the pump 17. The activated carbon tank 5 and the ionization tank 6 are connected in series by a communication pipe 31 connecting the outlet 5b of the activated carbon tank 5 and the inlet 6a of the ionization tank 6, as is well shown in FIG.
Is connected to one end of a return pipe 32 extending to the water storage tank 2. As a result, the primary treated water flowing into the activated carbon tank 5 from the inlet 5a flows through the activated carbon tank 5, and is then fed from the outlet 5b to the inlet 6a of the ionization tank 6 through the pipe 31. Through the return pipe 32 from the outlet 6b through the return pipe 32.
Will be fed to The activated carbon tank 5 contains granular activated carbon, and the ionization tank 6 contains an ionized material made of a fired granite ore containing granular ore, and the pollutant contained in the primary treatment water. Is adsorbed on the activated carbon in the activated carbon tank 5 and the ionizing material in the ionization tank 6 and sufficiently removed, and further ionized (activated) by the ionizing material in the ionization tank 6 to improve the water quality. That is, the treated water sufficiently purified by the activated carbon and the ionizing material and improved in water quality is returned to the water storage tank 2.

A submersible pump 33 for supplying treated water to the car washer 1 is provided in the water storage tank 2, and a strainer 34 for restricting sand particles from entering the pipe 16 is provided in the water collection tank 3. Are located. The water tank 2 has a water pipe 3
A water supply pipe 36 extending from 5 is connected. An opening / closing valve 38 that operates in response to a signal from a liquid level sensor 37 provided in the water storage tank 2 is interposed in the water supply pipe 36, and is connected to the water storage tank 2 according to the valve opening operation of the opening / closing valve 38. Will be replenished with tap water. Further, flow meters 39 and 40 for detecting a flow rate are interposed in the return pipe 32 and the water supply pipe 36, respectively.

In the present embodiment, as shown in FIG. 2, three-way valves 41 and 42 are provided at pipe portions (the pipe 18 and the communication pipe 31) adjacent to the inlet 5a and the outlet 5b of the activated carbon tank 5, respectively. At the same time, the inlet 6 of the ionization tank 6
The three-way valves 43 and 44 are provided in the pipe portions (the communication pipe 31 and the return pipe 32) adjacent to a and the outlet 6b, respectively.
Here, a three-way valve 42 adjacent to the outlet 5b of the activated carbon tank 5 and a three-way valve 44 adjacent to the outlet 6b of the ionization tank 6 are connected by a bypass pipe 45. The bypass pipe 45 is connected to an air source via a pipe 46. 47 are connected. On the other hand, the three-way valve 41 adjacent to the inlet 5a of the activated carbon tank 5 and the three-way valve 43 adjacent to the inlet 6a of the ionization tank 6 are connected to drain branch pipes 49 and 50 that join a drain pipe 48 extending outside the apparatus. I have. Further, a three-way valve 51 is interposed in the pipe 46, and a branch water supply pipe 52 branched from the water supply pipe 36 is connected to the three-way valve 51. These pipes 45, 46, 48, 49, 50, 52 and valves 41,
Reference numerals 42, 43, 44, and 51 constitute a back washing circuit for washing the activated carbon in the activated carbon tank 5 and the ionizing material in the ionization tank 6, which will be described later in detail.

Further, the water collecting tank 3 to the coagulation reaction tank 11
Pipe 16 for pumping waste water to the treatment tank 14
18 for supplying primary treated water from the tank to the activated carbon tank 5
A bypass pipe 53 is provided to bypass this. The bypass pipe 53 is for circulating the stagnant water stagnating in each tank in the tank unit 10 while the apparatus is not in operation, and constitutes a stagnant water circulation circuit together with the pump 17 in the pipe 18.

Hereinafter, the operation of the waste water purifying apparatus configured as described above will be described. The pump 33 in the water tank 2, the pump 15 in the pipe 16, the pumps 24 and 25 in the medicine supply device 19, the fine bubble generator 20
The operation of the pressurizing pump 26 in the inside and the pump 17 in the pipe 18 are started, whereby the washing liquid in the water storage tank 2 is pumped up by the car washer 1 and the wastewater collected in the water collecting tank 3 is sent to the coagulation reaction tank 11. Pumped up. During the pumping to the coagulation reaction tank 11, the coagulant is mixed into the wastewater from the chemical supply device 19, and the wastewater containing the coagulant flows from the coagulation reaction tank 11 to the flotation tank 12 in order. The floc generation due to the flocculation reaction and the floating of the flocs due to the microbubbles proceed, the suspended matter in the wastewater floats as scum 29, and the wastewater containing the detergent is temporarily purified. The primarily purified wastewater flows sequentially from the lower side of the floating separation tank 12 into the separation water tank 13, from the upper side of the separation water tank 13 to the treatment water tank 14, and flows into the treatment water tank 14 as primary treatment water. It is stored. In this embodiment, since the scum 29 overflows the scum discharge gutter 30 and is discharged outside the apparatus, it is not necessary to remove the scum 29 from the flocculation reaction tank 11 and the flotation separation tank 12. become.

On the other hand, the primary treated water stored in the treated water tank 14 is supplied to the inlet 5a of the activated carbon tank 5 through the pipe 18, flows through the activated carbon tank 5, and is discharged from the outlet 5b. The pollutants remaining in the primary treatment water are adsorbed on the activated carbon in the activated carbon tank 5, and the wastewater is further purified. Thereafter, the primary treatment water is fed to the inlet 6a of the ionization tank 6 through the communication pipe 31, circulates in the ionization tank 6, and is discharged from the outlet 6b. During this time, pollutants remaining in the primary treatment water are ionized. The water is adsorbed by the ionizing material in the tank 6 and the wastewater is further purified. At the same time, the treated water is ionized (activated) by the ionizing material,
The water quality is improved, and the treated water that has been sufficiently purified to a level that can be reused and whose water quality has been improved is returned to the water storage tank 2. According to the experiment, the loss of wastewater between the car washer 1 and the water collecting tank 3 is about 5%, the loss of wastewater in the pressurized flotation type purification device 4 is about 10%, the activated carbon tank 5 and the ionized water. The consumption of tap water required for back washing of the tank 6 is almost 3%, and it can be confirmed that almost 82% of the washing water used in the washing machine 1 can be recycled as a whole, which is great for effective use of water resources and cost reduction. Will contribute.

Incidentally, the activated carbon in the activated carbon tank 5 and the ionized material in the ionization tank 6 gradually deteriorate due to the progress of adsorption of pollutants as they are used, so it is necessary to periodically clean and regenerate them. . Therefore, in the present embodiment, by using the above-mentioned back washing circuit and controlling the valves constituting the back washing circuit to be turned on / off at appropriate timing, the drainage water is discharged to the activated carbon tank 5 and the ionization tank 6. The cleaning medium is caused to flow in the opposite direction to the cleaning. In the following description, the inlet 5 of the activated carbon tank 5 and the ionization tank 6
The three-way valves 41, 43 adjacent to the inlets 5a, 6a
a is turned on at a position communicating with the drainage branch pipes 49, 50, and the three-way valves 42, 44 adjacent to the outlets 5b, 6b of the activated carbon tank 5 and the ionization tank 6 are set at positions connecting the respective outlets 5b, 6b to the bypass pipe 45. Each is described as ON. Furthermore, the three-way valve 51 in the pipe 46 will be described as a position where the water supply pipe 36 communicates with the bypass pipe 45 is turned on and a position where the air source 47 is communicated with the bypass pipe 45 is turned off.

At the time of back washing, first, all the three-way valves 41, 42, 4 attached to the activated carbon tank 5 and the ionization tank 6 are used.
3 and 44 are turned on, and the inlets 5a and 6a of the activated carbon tank 5 and the ionization tank 6 are connected to the drainage branch pipes 49 and 50, and the outlets 5b and 6b of the activated carbon tank 5 and the ionization tank 6 are connected to the bypass pipe 45. And In this state, when the on-off valve 38 in the water supply pipe 36 is closed and the three-way valve 51 in the pipe 46 is turned on, tap water is supplied to the bypass pipe 45 via the branch water supply pipe 52 and the pipe 46. The tap water flows into the activated carbon tank 5 from the outlet 5b of the activated carbon tank 5 and flows into the ionization tank 6 from the outlet 6b of the ionization tank 6, and flows through the activated carbon tank 5 and the ionization tank 6, respectively. It is discharged from 6a to the drain branch pipe 49. During this time, the activated carbon in the activated carbon tank 5 and the ionization tank 6
The ionized material in the inside is washed by tap water flowing backward during the purification of wastewater, thereby removing pollutants adsorbed on the ionized material and the activated carbon. It is discharged from 50 through the drain pipe 48 to the outside of the apparatus.

When the cleaning of the activated carbon tank 5 and the ionization tank 6 is completed for a predetermined time, the three-way valve 51 in the pipe 46 is turned off. Then, compressed air is supplied from the air source 47 to the bypass pipe 45 via the pipe 46. The compressed air flows into the activated carbon tank 5 from the outlet 5b of the activated carbon tank 5 and into the ionization tank 6 from the outlet 6b of the ionization tank 6, respectively.
And after flowing through the ionization tank 6, each inlet 5
a and 6a are discharged to the drain branch pipe 49. During this time, the pollutants are further removed from the activated carbon and the ionized material, and the washing wastewater containing the pollutants is discharged into the drainage branch pipes 50, 4 and 4.
9 and is discharged out of the apparatus through a drain pipe 48. Thus, one cycle of the back washing is completed, and this cycle is repeated two or three times as necessary. Thereby, the activated carbon in the activated carbon tank 5 and the ionized material in the ionization tank 6 are regenerated, and the long-term stable use thereof becomes possible.

If the apparatus is to be stopped for a long time, stagnant water or odor is generated in the water remaining in each tank in the tank unit 10. The pumps 24 and 25 in the pump 19 are stopped, and the pump 17 which is shared as a circulating water circulation circuit is operated to circulate the stagnant water stagnating in each tank in the tank unit 10.

In the above embodiment, the pressurized flotation type purifying device 4 is configured to supply fine bubbles from the fine bubble generating device 20 to both the agglutination reaction tank 11 and the flotation separation tank 12. The supply of the fine bubbles may be performed only to the flotation tank 12.

[0024]

As described in detail above, according to the first aspect of the present invention, the wastewater can be reused by discharging the wastewater at least continuously through at least the activated carbon tank and the ionization tank. Purification of water and improvement of water quality have progressed to a certain level. Further, according to the second aspect of the present invention, most of the wastewater after washing the equipment can be recycled, so that the amount of tap water used can be significantly reduced, and the effective use of water resources can be achieved. This greatly contributes to cost reduction.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a waste water purifying apparatus according to the present invention configured as a car wash waste water recycling system.

FIG. 2 is a circuit diagram showing a back washing circuit attached to the waste water purifying apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car wash machine 2 Water storage tank 3 Water collecting tank 4 Pressurized floating separation type purification device (primary purification means) 5 Activated carbon tank 6 Ionization tank 11 Coagulation reaction tank 12 Floating separation tank 13 Separation water tank 14 Treatment water tank 19 Chemical supply device 20 Fine bubble generation Apparatus 30 Scum discharge gutter 32 Return pipe 35 Water pipe 45 Bypass pipe (backwash circuit) 46 Piping (backwash circuit) 47 Air source (backwash circuit) 53 Bypass pipe (retained water circulation circuit)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 1/68 540 C02F 1/68 540A 540Z 9/00 502 9/00 502H 502P 502Z 503 503G 503C 504 504B 504E (72) Inventor Masahiko Furuya 2-9-1-7-309 Tsujido West Coast, Fujisawa-shi, Kanagawa F-term (reference) 4D024 AA01 BA02 BC01 CA01 DB08 DB21 DB30 4D037 AA11 BA03 BB07 BB09 CA01 CA08

Claims (9)

[Claims] 1. An apparatus for purifying waste water, comprising: an activated carbon tank and an ionization tank; and continuously flowing waste water through the activated carbon tank and the ionization tank. 2. The wastewater purification apparatus according to claim 1, wherein the ionization tank contains a granular ionization material. 3. The method according to claim 1, further comprising a primary purifying means for removing suspended substances contained in the wastewater, wherein the primary treated water purified by the primary purifying means is continuously passed through the activated carbon tank and the ionization tank. The wastewater purification device according to claim 1 or 2, wherein 4. The purifying device according to claim 3, wherein the primary purifying means comprises a pressurized flotation-type purifying device for mixing a drug into waste water and generating fine bubbles to flotate and separate suspended substances. Wastewater purification equipment. 5. A water storage tank for storing treated water, a water collection tank for storing drainage after cleaning equipment using the cleaning water in the water storage tank, a chemical mixed into drainage pumped from the water collection tank, and A pressurized flotation-type purifying device that generates microbubbles to levitate and separate suspended substances, and an activated carbon tank and an ionization tank containing a granular ionized material are provided. A wastewater purifying apparatus, wherein treated water is continuously circulated through the activated carbon tank and the ionization tank, and treated water that has passed through the ionization tank is returned to the water storage tank. 6. The waste water purifying apparatus according to claim 5, wherein a water pipe is connected to the water storage tank so that a shortage of the treated water is supplemented by the tap water. 7. The waste water purifying apparatus according to claim 5, wherein the pressurized floating separation type purifying apparatus includes scum removing means for overflowing the floating scum and discharging the scum to the outside of the apparatus. . 8. The method according to claim 5, wherein a backwashing circuit is provided for each of the activated carbon tank and the ionization tank, in which a washing medium is circulated in a direction opposite to the direction in which the wastewater is purified. The wastewater purifying apparatus according to the above. 9. A retentive water circulation circuit for circulating retained water in the pressurized flotation-type purification device in a state in which the supply of the drug in the pressurized flotation-type purification device is stopped. The wastewater purification device according to any one of claims 7 to 7.