JPH11309446A - Composite water purifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the working scale of a filter tank and to reduce the use of a flocculating agent by providing a primary treating device with a floatation equipment, a generator generating fine bubbles in a raw water in the bottom part of the floatation equipment and a suction unit sucking a surface layer water in the floatation equipment and providing a secondary treating device with a filter tank filtering the sucked surface layer water. SOLUTION: The primary treating device A is composed of the floatation equipment 4, a pressurized water pump 7, a pressurized water tank 9, an air compressor 10, a mixing implement 11, the fine bubbles generator 13, etc. The compressed air from the air compressor 10 is mixed to the pressurized water introduced by the pressurized water pump 7 at the pressurized water tank 9. The pressurized water is mixed with the raw water from a water tank 1 at the mixing implement 11 and passed through an inlet zone 17 divided with a partition 16, and a muddy substance in the raw water is stuck to the bubbles at a floatation zone 18 and floated to the surface layer part. On the other hand, a clarified water is allowed to fall to a lower layer, and after flowing over an overflow weir 6, the clarified water is returned to the water tank 1. A concentrated muddy substance is passed through a surface layer water suction implement 8 by a circulation pump 14 of the secondary treating device B, and after being filtered with a filter tank 15, the filtrate is returned to the water tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus for a water area such as a pond or a dam, a fishery farming facility, a sewage treatment facility, or the like.

[0002]

2. Description of the Related Art Conventional techniques for removing turbid substances contained in a large amount of water (purifying water) include the following two main means.

FIG. 6 shows an example of a filter medium or a non-woven fabric which mainly has a filtering action. A typical example is a pressure filter tank 30 using a fine filter medium. Filtration is performed by suctioning and pressurizing raw water in the water tank 1 by a circulation pump 31 and pushing it into a pressure filtration tank 30 containing a fine filter medium. The principle of filtration is mainly physical separation using a fine filter medium, and sand or anthracite is generally used as the filter medium.

[0004] As a conventional technique, as shown in FIG. 7, there is a technique utilizing the principle of flotation by adhesion of turbid matter to bubbles. That is, the raw water in the water tank 1 is transferred by a transfer pump.
34, an agglutination reaction tank 42, a mixer 40, a microbubble generator 37, etc., and then sent to the flotation / separation tank 32.
The internal water is pressurized by a pressurized water pump 36 and mixed with high-pressure air by an air compressor 39, and the high-pressure bubbled water is sent to the mixer 40. In this way,
The principle that turbid matter easily adheres to fine bubbles generated when pressurized water in which air is dissolved in supersaturation and released to the atmospheric pressure in the flotation tank 32 is used.

[0005] In such a conventional apparatus, the turbid matter is concentrated near the water surface, and what is contained in the floss (bubbles) floating on the water surface is to be collected (removed). In general, it is necessary to include the turbidity at a high concentration, and the turbid accumulation and the concentrated air bubble scraping device 33 are very close to the water surface.

[0006]

In the prior art shown in FIG. 6, during the treatment of a large amount of water, since the raw water is treated while the suspended matter is uniformly dispersed, it is necessary to treat the entire amount of the raw water.
There is a disadvantage that a large-capacity filtration tank is required. Further, when the concentration of the inflow water is low, there is a disadvantage that the removal efficiency is lowered. Then, in order to increase the removal efficiency, a flocculant may be used for pretreatment.

In the conventional technique shown in FIG. 7, a large amount of coagulant must be used to concentrate turbid matter to a high concentration. However, the coagulant is expensive, so that it is suitable for a large-capacity primary treatment apparatus. There is a disadvantage that not. Further, since a scraping device is used for collecting the concentrated air bubbles, the device is complicated. Furthermore, since the concentrated bubbled water is discharged by the scraper, the discharge is intermittent, and the operation of the pump for transferring the discharged polluted water is complicated.

Therefore, an object of the present invention is to solve the following problems in order to efficiently and efficiently process a large volume of water at a low cost. (1) Reduce the scale of use of the filtration tank. (2) Use of a flocculant is reduced. By removing a large amount of the concentrated turbidity and rapidly, the separation and flotation of the turbidity in the flotation separation tank is promoted. (3) No scraping device is required. (4) Continuous discharge of the concentrated water facilitates the operation control of the pump.

[0009]

In order to solve the above-mentioned problems, the combined water purification apparatus of the present invention is configured in consideration of the following matters. (1) A primary treatment characterized by low concentration but low-volume, short-time treatment without removing turbidity only in a single treatment tank, and a secondary treatment capable of improving the removal rate by pre-concentration And a combination. (2) The primary treatment is flotation separation, which collects turbid matter at the stage where air bubbles on the water surface and turbid matter have been concentrated in the surface water below the surface before development. Eliminates or reduces the use of flocculants because it is not necessary to use a small amount of high-temperature bubble water (use small amounts depending on the situation). (3) The flotation tank is provided with an overflow device suitable for continuously discharging surface water and transferring it to the secondary treatment device, and a surface water suction device that follows the water surface.

That is, the combined water purifying apparatus of the present invention comprises:
A flotation tank for receiving raw water containing turbid matter, a microbubble generator for generating microbubbles in raw water in the bottom of the flotation tank, and a surface water suction device for sucking surface water in the flotation tank And a secondary treatment device having a filtration tank for filtering the surface water sucked by the surface water suction device.

The combined water purifying apparatus of the present invention further comprises a pressurized water pump for sucking and pressurizing water in the flotation tank, a pressurized water tank to which pressurized water is supplied from the pressurized water pump, and a pressurized water tank. A gas compressor capable of injecting pressurized gas and a high-pressure bubble water supply line connected from the pressurized water tank to the fine bubble generator through an orifice are provided.

Further, the combined water purification apparatus of the present invention further comprises a pressurized water pump for sucking and pressurizing water in the flotation tank,
A pressurized water tank that is supplied with pressurized water from the pressurized water pump, a gas compressor that can pressurize pressurized gas into the pressurized water tank, and a high-pressure bubble water supply line that connects the pressurized water tank to the microbubble generator are provided. The discharge nozzle of the microbubble generator is set to have an increased fluid resistance until the internal pressure of the pressurized water tank can be maintained at a required pressure.

[0013] Further, in the composite water purifying apparatus of the present invention, the discharge nozzle of the microbubble generating device may discharge the bubble water in a horizontal direction in the bottom of the flotation tank so as to promote the horizontal flow. Is set.

Further, the combined water purification apparatus of the present invention is provided with an overflow device for returning the water treated in the flotation tank, and controls the height of the dam of the overflow device to adjust the height of the dam. Means are provided.

The combined water purification apparatus of the present invention further comprises a thick inflow pipe for transferring a large amount of raw water from the water tank into which the raw water has been introduced to the flotation tank, and a flow promoting device mounted in the inflow pipe. Is provided.

Further, the combined water purification apparatus of the present invention is characterized in that the water tank into which the raw water is introduced and the floatation / separation tank are arranged substantially horizontally, and the inflow pipe is also horizontally arranged.

Further, the combined water purification apparatus of the present invention is characterized in that the flotation tank is provided with a top plate having an air vent pipe.

In the above-described combined water purification apparatus of the present invention, the following operation is performed. (1) The primary treatment apparatus treats a large amount of raw water in a short time, although the concentration rate is low, and selectively and quickly transfers the concentrated bubbled water to the secondary treatment apparatus by the surface water suction device. In addition, since the pre-concentration is performed by the primary treatment, the removal rate is improved in the secondary treatment, and as a result, the scale of the secondary treatment device can be reduced. (2) When the installation position of the facility is arranged horizontally, the power for transferring the treated water can be reduced. The raw water transfer device (flow promotion device) can transfer a required amount of water with a small amount of power. That is, by changing the flow velocity energy of the driving water pump to a flow rate, the flow velocity is reduced to efficiently transfer a large amount of raw water at a low speed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the combined water purification apparatus according to the first embodiment of the present invention shown in FIG. 1, raw water in the water tank 1 is transferred to the primary treatment device A by the suction pipe 25 and the raw water transfer device 2. When the height difference between the water tank 1 and the flotation tank 4 is small, driving water is supplied to the raw water transfer device 2 by the driving water pump 3 and a large amount of flow is generated by using the eductor effect, so that the raw water in the water tank 1 is reduced. The transfer method to the primary processing apparatus A may be used.

The primary treatment apparatus A comprises a flotation / separation tank 4 having a treated water overflow weir 6, a pressurized water pump 7, a pressurized water tank (air dissolving device) 9, an air compressor 10, a mixer 11, and a pressure of a pressurized water tank 9. Orifice 12, which keeps the pressure, and a microbubble generator 13.

The pressurized water supplied by the pressurized water pump 7 is mixed with compressed air from an air compressor 10 in a pressurized water tank 9. The pressurized water is mixed into the raw water from the water tank 1 in the mixer 11 via the pressurized water return pipe 29, and is suspended in the raw water by the action of fine bubbles precipitated in the floating section 18 through the inflow section 17 partitioned by the partition 16. Adhere to the air bubbles and float on the surface layer. On the other hand, the clarified water falls to the lower layer, and after passing over the overflow weir 6, is returned to the water tank 1 by the return water pump 5 and the treated water return pipe 23.

The condensed turbidity accumulated in the surface layer of the floating section passes through the surface water suction unit 8 by the circulation pump 14 of the secondary treatment apparatus B, and is filtered by the filtration tank 15 using a pressure filtration system or the like. The water is returned to the water tank 1 by the water return pipe 26. In this drawing, the surface water suction device 8 is a float type of a water surface following type, but may have an overflow weir structure.
The floater 22 follows the water surface by buoyancy.

Next, in the combined water purification apparatus according to the second embodiment of the present invention shown in FIG. 2, a case where the water tank 1 and the flotation tank 4 are installed horizontally is shown. Raw water in the water tank 1 passes through a grid 19 and an inflow pipe (communication pipe) 20 for preventing foreign matter from entering,
It flows into the flotation tank 4 by the transfer device 21. The treated water separated in the flotation tank 4 is returned to the return pipe 27 by pump pressure.
Is returned to the water tank 1.

The return pipe 27 is generally located at the bottom, but may go up and down depending on the situation. The transfer device 21 is a propeller system or an eductor system using the discharge pressure of the pressurized water pump 7, and may use a rectifying cylinder 28 and a built-in discharge nozzle 24 to amplify the flow amount. A valve is provided in each pipeline, and is used, for example, when closing the pipeline for flow control or inspection of the apparatus.

In the combined water purification apparatus according to the third embodiment of the present invention shown in FIG. 3, the use of gravity in the treated water return system and the means for continuously discharging concentrated water in the flotation tank are devised. Have been.

The water tank (or water area) 1 allows the suction pipe 25,
The raw water sent to the pressurized water tank 9 by the pressurized water pump 7 is
On the way, the coagulant is mixed by the coagulant tank 45 and the mixer 44 as necessary, or the inflow pipe 20, the raw water transfer pump 41
And the raw water which does not pass through the pressurized water tank 9 is mixed by the mixer 46.

The raw water flowing into the pressurized water tank 9 via the mixer 11 is mixed with pressurized air by the air compressor 10 and the mixer 11 and dissolved in the pressurized water tank 9. The water is discharged to the atmospheric pressure in the inflow section 17 partitioned by the partition 16 through the water discharge section 47, and the suspended fines in the water adhere to and float on the microbubbles deposited, thereby concentrating the turbid near the water surface.

The concentrated water 55 flows out of the concentrated water outflow weir 48,
The water is continuously sucked by the return water pump 5 and returned to the water tank (or water area) 1 by gravity through the filtration tank 35 and the filtered water return pipe 26. In order to improve the removal performance in the filtration tank, a flocculant tank 52 and a mixer 53 may be added. The treated water separated from the concentrated water 55 is discharged from the overflow pipe 50 through a treated water discharge part baffle plate 49 for preventing the occurrence of a local flow due to the discharge, and is supplied to the water tank 1 through the treated water return pipe 23 by gravity. Return.

The overflow section is provided with an overflow movable section 51 so that the water level can be adjusted. The top of the concentrated water overflow weir 48 may be bent inward to prevent the treated water from rising downward.

FIG. 4 shows a modification of the third embodiment of FIG. That is, a case is shown in which the upper part of the flotation tank 4 has a top structure composed of the top plate 57 and the air vent pipe 58.
When mounted on a ship, etc., when this device shakes,
It suppresses the fluctuation of the water surface inside and exerts the effect of maintaining the separation performance. The top plate 57 may be inclined toward the air vent pipe 58 as shown in FIG. In this manner, the air vent pipe 58 is provided at the center of the top plate 57, and can be formed in a rectangular shape.

As each component in the apparatus of each embodiment, concrete, steel, FRP, PVC or the like is appropriately used. In recent years, water purification devices have become larger with the increase in the size of various water tanks. However, the present invention makes it possible to greatly simplify the water purification device.

[0032]

As described in detail above, according to the combined water purification apparatus of the present invention, the following effects can be obtained. (1) Since the filtration device used as the secondary treatment device is the one to be concentrated by the primary treatment, the amount of treated water is small. In addition, since the removal rate is also improved, the number of installations can be reduced as compared with the case of single use, and the apparatus can be greatly simplified. (2) Since the primary treatment device may be roughly separated, a concentrated bubble scraping device is not required and the device can be made compact. (3) Since the concentration of surface water in the primary treatment equipment may be low,
The addition of the flocculant can be reduced or even eliminated. (4) By arranging the raw water tank and the flotation tank horizontally, the power of the treated water transfer device between them can be reduced. (5) By using a flow promoting device as the raw water transfer device, the raw water can be transferred with small power.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a combined water purification device as a first embodiment of the present invention.

FIG. 2 is a system diagram showing a combined water purification device as a second embodiment of the present invention.

FIG. 3 is a system diagram showing a combined water purification device as a third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a modification of the main part of the third embodiment in FIG. 3;

FIG. 5 is an explanatory diagram showing another modification of the main part of the third embodiment in FIG. 3;

FIG. 6 is a system diagram showing an example of a conventional water purification device.

FIG. 7 is a system diagram showing another example of a conventional water purification device.

[Explanation of symbols]

 Reference Signs List 1 water tank 2 raw water transfer device 3 drive water pump 4 floatation separation tank 5 return water pump 6 treated water overflow weir 7 pressurized water pump 8 surface water suction device 9 pressurized water tank 10 air compressor 11 mixer 12 orifice 13 fine bubble generator 14 circulation Pump 15 Filtration tank 16 Partition wall 17 Inflow section 18 Floating section 19 Grid 20 Inflow pipe 21 Transfer device 22 Floater 23 Treated water return pipe 24 Discharge nozzle 25 Suction pipe 26 Filtration water return pipe 27 Return pipe 28 Rectifier cylinder 29 Pressurized water return pipe 30 Pressure Filtration tank 31 Circulation pump 32 Floatation separation tank 33 Concentrated bubble scraping device 34 Transfer pump 35 Filtration tank 36 Pressurized water pump 37 Microbubble generator 38 Pressurized water tank (air dissolving device) 39 Air compressor 40 Mixer 41 Raw water transfer pump 42 Condensation Reaction tower 44 Mixer 45 Coagulant tank 46 Mixer 47 Inflow water discharge section 48 Concentrated water inflow weir 49 Treated water discharge section baffle 50 Overflow pipe 51 Overflow movable section 52 Coagulant tank 53 Mixer 54 Support stand 55 Concentrated water 56 Coagulant tank 57 Top plate 58 Air release pipe A Primary treatment device B Secondary treatment device

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[Procedure amendment]

[Submission date] June 30, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Combined water purification device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus for a water area such as a pond or a dam, a fishery farming facility, a sewage treatment facility, or the like.

[0002]

2. Description of the Related Art Conventional techniques for removing turbid substances contained in a large amount of water (purifying water) include the following two main means.

FIG. 6 shows an example of a filter medium or a non-woven fabric which mainly performs a filtering action. A typical example is a pressure filter tank 30 using a fine filter medium.
Filtration is performed by suctioning and pressurizing raw water in the water tank 1 by a circulation pump 31 and pushing it into a pressure filtration tank 30 containing a fine filter medium. The principle of filtration is mainly physical separation using a fine filter medium, and sand or anthracite is generally used as the filter medium.

[0004] As a conventional technique, as shown in FIG. 7, there is a technique utilizing the principle of flotation by adhesion of turbid matter to bubbles. That is, the raw water in the water tank 1 is sent to the floating separation tank 32 via the transfer pump 34, the coagulation reaction tank 42, the mixer 40, the fine bubble generator 37, and the like. While being pressurized by the pump 36, high-pressure air is mixed in by the air compressor 39, and the high-pressure bubbled water is sent to the mixer 40. In this manner, the principle that turbid matter is easily attached to fine bubbles generated when pressurized water having supersaturated air dissolved therein is released to the atmospheric pressure in the flotation tank 32 is used.

[0005] In such a conventional apparatus, the turbid matter is concentrated near the water surface, and what is contained in the floss (bubbles) floating on the water surface is to be collected (removed). It is necessary to include a high concentration, and it is common to devise a device 33 for accumulating turbidity very close to the water surface and for removing the concentrated air bubbles.

[0006]

In the prior art shown in FIG. 6, during the treatment of a large amount of water, since the raw water is treated while the suspended matter is uniformly dispersed, it is necessary to treat the entire amount of the raw water.
There is a disadvantage that a large-capacity filtration tank is required. Further, when the concentration of the inflow water is low, there is a disadvantage that the removal efficiency is lowered. Then, in order to increase the removal efficiency, a flocculant may be used for pretreatment.

In the conventional technique shown in FIG. 7, a large amount of coagulant must be used to concentrate turbid matter to a high concentration. However, the coagulant is expensive, so that it is suitable for a large-capacity primary treatment apparatus. There is a disadvantage that not. Further, since a scraping device is used for collecting the concentrated air bubbles, the device is complicated. Furthermore, since the concentrated bubbled water is discharged by the scraper, the discharge is intermittent, and the operation of the pump for transferring the discharged polluted water is complicated.

Therefore, an object of the present invention is to solve the following problems in order to efficiently and efficiently process a large volume of water at a low cost. (1) Reduce the scale of use of the filtration tank. (2) Use of a flocculant is reduced. By removing a large amount of the concentrated turbidity and rapidly, the separation and flotation of the turbidity in the flotation separation tank is promoted. (3) No scraping device is required. (4) Continuous discharge of the concentrated water facilitates the operation control of the pump.

[0009]

In order to solve the above-mentioned problems, the combined water purification apparatus of the present invention is configured in consideration of the following matters. (1) A primary treatment characterized by low concentration but low-volume, short-time treatment without removing turbidity only in a single treatment tank, and a secondary treatment capable of improving the removal rate by pre-concentration And a combination. (2) The primary treatment is flotation separation, which collects turbid matter at the stage where air bubbles on the water surface and turbid matter have been concentrated in the surface water below the surface before development. A small amount, it is not necessary to be high concentrations of bubble water (using a small amount as appropriate) either reducing eliminate the use of flocculants. (3) The flotation tank is provided with an overflow device suitable for continuously discharging surface water and transferring it to the secondary treatment device, and a surface water suction device that follows the water surface.

That is, the combined water purifying apparatus of the present invention comprises:
A flotation tank for receiving raw water containing turbid matter, a microbubble generator for generating microbubbles in raw water in the bottom of the flotation tank, and a surface water suction device for sucking surface water in the flotation tank And a secondary treatment device having a filtration tank for filtering the surface water sucked by the surface water suction device.

[0011] composite water purifying apparatus of the present invention, the apparatus
A pressurized water pump that suctions and pressurizes the water to be purified in the above, a pressurized water tank to which pressurized water is supplied from the pressurized water pump, and a gas compressor that can pressurize a pressurized gas into the pressurized water tank,
And a high-pressure bubble water supply line connected to the fine bubble generator from the pressurized water tank via an orifice.

Further, the combined water purification apparatus of the present invention is provided with
Pressurized water pump that sucks and pressurizes the water to be purified in the device, a pressurized water tank to which pressurized water is supplied from the pressurized water pump, and a gas compressor that can pressurize the pressurized gas into the pressurized water tank,
A high-pressure bubble water supply line connected from the pressurized water tank to the fine bubble generator is provided, and a discharge nozzle of the fine bubble generator increases the fluid resistance until the internal pressure of the pressurized water tank can be maintained at a required pressure. It is characterized by having been set to have.

[0013] Further, in the composite water purifying apparatus of the present invention, the discharge nozzle of the microbubble generating device may discharge the bubble water in a horizontal direction in the bottom of the flotation tank so as to promote the horizontal flow. Is set.

Further, the combined water purification apparatus of the present invention is provided with an overflow device for returning the water treated in the flotation tank, and controls the height of the dam of the overflow device to adjust the height of the dam. Means are provided.

The combined water purification apparatus of the present invention further comprises a thick inflow pipe for transferring a large amount of raw water from the water tank into which the raw water has been introduced to the flotation tank, and a flow promoting device mounted in the inflow pipe. Is provided.

Further, the combined water purification apparatus of the present invention is characterized in that the water tank into which the raw water is introduced and the floatation / separation tank are arranged substantially horizontally, and the inflow pipe is also horizontally arranged.

Further, the combined water purification apparatus of the present invention is characterized in that the flotation tank is provided with a top plate having an air vent pipe.

In the above-described combined water purification apparatus of the present invention, the following operation is performed. (1) The primary treatment apparatus treats a large amount of raw water in a short time, although the concentration rate is low, and selectively and quickly transfers the concentrated bubbled water to the secondary treatment apparatus by the surface water suction device. In addition, since the pre-concentration is performed by the primary treatment, the removal rate is improved in the secondary treatment, and as a result, the size of the secondary treatment device can be reduced. (2) When the installation position of the facility is arranged horizontally, the power for transferring the treated water can be reduced. The raw water transfer device (flow promotion device) can transfer a required amount of water with a small amount of power. That is, by changing the flow velocity energy of the driving water pump to a flow rate, the flow velocity is reduced to efficiently transfer a large amount of raw water at a low speed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the combined water purification apparatus as the first embodiment of the present invention shown in FIG. 1, the raw water in the water tank 1 is transferred to the primary treatment device A by the suction pipe 25 and the raw water transfer device 2. When the height difference between the water tank 1 and the flotation tank 4 is small, driving water is supplied to the raw water transfer device 2 by the driving water pump 3 and a large amount of flow is generated by using the eductor effect, so that the raw water in the water tank 1 is reduced. The transfer method to the primary processing apparatus A may be used.

The primary treatment apparatus A includes a flotation / separation tank 4 having a treated water overflow weir 6, a pressurized water pump 7, a pressurized water tank (air dissolving device) 9, an air compressor 10, a mixer 11, and a pressurized water tank 9.
And an orifice 12 for maintaining the pressure, and a microbubble generator 13.

In the pressurized water tank 9, compressed air from an air compressor 10 is mixed with the pressurized water provided by the pressurized water pump 7. The pressurized water is mixed with the raw water from the water tank 1 in the mixer 11 through the pressurized water return pipe 29, and flows into the floating section 1 through the inflow section 17 partitioned by the partition 16.
By the action of the microbubbles precipitated in 8, the suspended matter in the raw water adheres to the bubbles and floats on the surface layer. On the other hand, the clarified water falls to the lower layer, and after passing over the overflow weir 6, is returned to the water tank 1 by the return water pump 5 and the treated water return pipe 23.

The condensed turbidity accumulated in the surface layer of the floating section is circulated by the circulating pump 14 of the secondary treatment apparatus B to the surface water suction device 8.
, Is filtered by a filtration tank 15 using a pressure filtration system or the like, and then returned to the water tank 1 by a filtered water return pipe 26. In this drawing, the surface water suction device 8 is a float type of a water surface following type, but may have an overflow weir structure. The floater 22 follows the water surface by buoyancy.

Next, in the combined water purification apparatus according to the second embodiment of the present invention shown in FIG. 2, a case where the water tank 1 and the flotation tank 4 are installed horizontally is shown. The raw water in the water tank 1 flows into the flotation tank 4 by the transfer device 21 via the grid 19 and the inflow pipe (communication pipe) 20 for preventing foreign matter from entering. Treated water separated in the flotation tank 4 is returned to the water tank 1 through the Ri tube 27 back.

The return pipe 27 is generally installed at the bottom, but may go up and down depending on the situation. Transfer device 21 is also utilized ejection exit nozzle 24 using the discharge pressure of the propeller type or pressurized pump 7. A valve is provided in each pipeline, and is used, for example, when closing the pipeline for flow control or inspection of the apparatus.

In the combined water purification apparatus according to the third embodiment of the present invention shown in FIG. 3, the use of gravity in the treated water return system and the means for continuously discharging concentrated water in the flotation tank are devised. Have been.

[0026] The water tank (or water) 1 good Ri suction pipe 25,
The raw water sent to the pressurized water tank 9 by the pressurized water pump 7 is
On the way, the coagulant is mixed by the coagulant tank 45 and the mixer 44 as necessary, or mixed with the raw water which does not pass through the pressurized water tank 9 by the inflow pipe 20, the raw water transfer pump 41 and the mixer 46.

The raw water flowing into the pressurized water tank 9 via the mixer 11 is mixed with pressurized air by the air compressor 10 and the mixer 11, dissolved in the pressurized water tank 9, and then dissolved in the flotation tank 4. The water is discharged to the atmospheric pressure in the inflow section 17 separated by the partition 16 through the water discharge section 47, and the suspended fines in the water are adhered to and float on the precipitated fine bubbles, and the suspended fines are concentrated near the water surface.

The concentrated water 55 flows out of the concentrated water outflow weir 48 and is continuously sucked by the return water pump 5.
The water is returned to the water tank (or water area) 1 via the filtered water return pipe 26 by gravity. In order to improve the removal performance in the filtration tank, a flocculant tank 52 and a mixer 53 may be added. The treated water separated from the concentrated water 55 is discharged from the overflow pipe 50 through a treated water discharge part baffle plate 49 for preventing generation of a local flow due to the discharge, and is discharged to the water tank 1 through the treated water return pipe 23 by gravity. Return.

The overflow section is provided with an overflow movable section 51 so that the water level can be adjusted. The top of the concentrated water overflow weir 48 may be bent inward to prevent the treated water from rising downward.

FIG. 4 shows a modification of the third embodiment of FIG. That is, a case is shown in which the upper part of the flotation tank 4 has a top structure composed of the top plate 57 and the air vent pipe 58. When mounted on a ship or the like, the present apparatus exerts the effect of suppressing the fluctuation of the water surface in the flotation separation tank 4 when the apparatus fluctuates, and maintaining the separation performance. The top plate 57 may be inclined toward the air vent pipe 58 as shown in FIG. In this manner, the air vent pipe 58 is provided at the center of the top plate 57, and can be formed into a rectangular shape.

As each component in the apparatus of each embodiment, concrete, steel, FRP, PVC or the like is appropriately used. In recent years, water purification devices have become larger with the increase in the size of various water tanks. However, the present invention makes it possible to greatly simplify the water purification device.

[0032]

As described in detail above, according to the combined water purification apparatus of the present invention, the following effects can be obtained. (1) Since the filtration device used as the secondary treatment device is the one to be concentrated by the primary treatment, the amount of treated water is small. In addition, since the removal rate is also improved, the number of installations can be reduced as compared with the case of single use, and the apparatus can be greatly simplified. (2) Since the primary treatment device may be roughly separated, a concentrated bubble scraping device is not required and the device can be made compact. (3) Since the concentration of the surface water in the primary treatment device may be low, the addition of the coagulant can be reduced or the coagulant can be eliminated. (4) By arranging the raw water tank and the flotation tank in the horizontal direction, the power of the treated water transfer device between them can be reduced. (5) By using the flow promoting device as the raw water transfer device, the raw water can be transferred with small power.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a combined water purification device as a first embodiment of the present invention.

FIG. 2 is a system diagram showing a combined water purification device as a second embodiment of the present invention.

FIG. 3 is a system diagram showing a combined water purification device as a third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a modification of the main part of the third embodiment in FIG. 3;

FIG. 5 is an explanatory diagram showing another modification of the main part of the third embodiment in FIG. 3;

FIG. 6 is a system diagram showing an example of a conventional water purification device.

FIG. 7 is a system diagram showing another example of a conventional water purification device.

[Description of Signs] 1 Water tank 2 Raw water transfer device 3 Driving water pump 4 Floating separation tank 5 Return water pump 6 Treated water overflow weir 7 Pressurized water pump 8 Surface water suction device 9 Pressurized water tank 10 Air compressor 11 Mixer 12 Orifice 13 Fine Bubble generator 14 Circulation pump 15 Filtration tank 16 Partition wall 17 Inflow section 18 Floating section 19 Grid 20 Inflow pipe 21 Transfer device 22 Floater 23 Treated water return pipe 24 Discharge nozzle 25 Suction pipe 26 Filtration water return pipe 27 Return pipe 29 Pressurized water return pipe Reference Signs List 30 pressure filtration tank 31 circulation pump 32 flotation separation tank 33 concentrated bubble scraping device 34 transfer pump 35 filtration tank 36 pressurized water pump 37 microbubble generator 38 pressurized water tank (air dissolving device) 39 air compressor 40 mixer 41 raw water transfer pump 42 Condensation reaction tower 44 Mixer 45 Coagulant tank 46 Mixing Container 47 Inflow water discharge part 48 Concentrated water inflow weir 49 Treated water discharge part baffle 50 Overflow pipe 51 Overflow movable part 52 Coagulant tank 53 Mixer 54 Support table 55 Concentrated water 56 Coagulant tank 57 Top plate 58 Air vent pipe A Primary treatment Equipment B Secondary processing equipment

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (8)

[Claims] 1. A flotation / separation tank for receiving raw water containing a turbid substance, a microbubble generator for generating microbubbles in raw water in the bottom of the flotation / separation tank, and suction of surface water in the flotation / separation tank A primary treatment device having a surface water suction device, and a secondary treatment device having a filtration tank for filtering the surface water sucked by the surface water suction device. Type water purification equipment. 2. The combined water purifier according to claim 1, wherein the pressurized water pump sucks water in the flotation tank and pressurizes the water, and a pressurized water tank to which pressurized water is supplied from the pressurized water pump. A composite water, comprising: a gas compressor capable of pressurizing a pressurized gas into a pressurized water tank; and a high-pressure bubble water supply line connected from the pressurized water tank to the microbubble generator via an orifice. Purification device. 3. The combined water purifying apparatus according to claim 1, wherein the pressurized water pump sucks water in the flotation tank and pressurizes the water, and a pressurized water tank to which pressurized water is supplied from the pressurized water pump. A gas compressor that can pressurize gas into the pressurized water tank and a high-pressure bubble water supply line that connects the pressurized water tank to the microbubble generator are provided, and the discharge nozzle of the microbubble generator is the pressurized water tank. Characterized in that it is set to have an increased fluid resistance until the internal pressure can be maintained at a required pressure. 4. The combined water purifying apparatus according to claim 3, wherein the discharge nozzle of the fine bubble generating device jets bubble water horizontally in the bottom of the floating separation tank to promote horizontal flow. Characterized in that the discharge direction is set as described above. 5. The combined water purification apparatus according to claim 1, further comprising an overflow device for returning the water treated in the flotation tank, wherein the overflow device is a dam. A combined type water purification device, characterized by comprising a dam movable part vertical adjusting means for adjusting the height of the dam. 6. The combined water purification apparatus according to claim 1, wherein a thick inflow pipe for transferring a large amount of raw water from the water tank into which the raw water has been introduced to the flotation tank. A combined water purification device, comprising: a flow promoting device mounted in the inflow pipe. 7. The combined water purifying apparatus according to claim 6, wherein the water tank into which the raw water is introduced and the flotation tank are arranged substantially horizontally, and the inflow pipe is also horizontally arranged. Characterized by a combined water purification device. 8. The combined water purification apparatus according to claim 1, wherein the flotation tank is provided with a top plate having an air vent pipe.
Combined water purification device.