JP2003275748A - Frozen and concentrated waste water treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce and concentrate waste water by continuous treatments regardless of a simple device configuration. <P>SOLUTION: A supercooled water producing heat exchanger 15 supercools waste water H. The supercooled waste water H collides with a supercooling release plate 14 and a portion of the supercooled waste water H becomes ice I. Waste water H is poured into an ice freezing tank 11 through a pipe 13, and the ice I and the supercooled waste water H are also supplied to the ice freezing tank 11. The waste water H and the ice I in the ice freezing tank 11 are sent to a centrifuge 16 and separated into the waste water H and the ice I. The separated ice I is melted away by an ice melting heat exchanger 17 and discharged as melted water W. The separated waste water H is sent to the supercooled water producing heat exchanger 15. Since water content in the waste water H is separated as ice I, the waste water H is reduced and also concentrated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freeze-concentration type wastewater treatment apparatus, and is devised so that the volume of wastewater can be reduced and concentrated by continuous treatment while having a simple apparatus configuration.

[0002]

2. Description of the Related Art In the current wastewater treatment system, biotreatment or treatment through a permeable membrane or a hollow fiber membrane is carried out in a water purification tank. These systems are mainly used for the purpose of treating wastewater, and the volume of wastewater cannot be reduced.

On the other hand, there is freeze concentration treatment as a treatment for reducing the volume of waste water. A conventional freeze-concentration type wastewater treatment device utilizing such freeze-concentration treatment is shown in FIG. The conventional freeze concentration type wastewater treatment device shown in FIG. 5 is a static type device for producing solid ice.

In this apparatus, the wastewater H is cooled by the ice particles I in the heat exchanger 1. The ice particles I are sent to the heat exchanger 1 from an ice particle aging tank 2 described later. The waste water H cooled in the heat exchanger 1 and the waste water H in the ice grain ripening tank 2 are combined in the combination tank 3 and then sent to the ice scraping heat exchanger 4.

The waste water H sent to the ice scraping heat exchanger 4 is frozen by the ammonia refrigerator 5 to become solid ice. The solid ice that has become this lump is scraped by the ice scraping mechanism of the ice scraping heat exchanger 4 to form ice particles I, and the ice particles I are sent to the ice particle aging tank 2.

The ice grain aging tank 2 is filled with waste water H, and in this ice grain aging tank 2, the ice grain I is aged (small ice grains are bonded together) and becomes large.
Ice grain I is a clear ice crystal and contains no impurities. By aging (increasing) the ice particles I, the specific surface area of the ice particles I becomes smaller, and the amount of washing water in the ice washing section 6 which is a subsequent step can be reduced.

The ice particles I are washed in the ice washing section 6 via the heat exchanger 1 and discharged. In this way, the water in the wastewater H is taken out as clear ice particles I, so that the wastewater H is reduced in volume and concentrated. Reduced and concentrated wastewater H
Remains at the bottom of the ice grain aging tank 2 and reduces the remaining volume.
The concentrated wastewater H is treated by a waste treatment company.
By the way, since the waste treatment cost depends on the amount of treatment liquid,
The volume reduction contributes to the reduction of the processing cost.

[0008]

By the way, in the conventional apparatus shown in FIG. 5, there are disadvantages that the cost is high due to the large number of devices and only batch processing is possible.

In view of the above-mentioned prior art, it is an object of the present invention to provide a freeze-concentration type wastewater treatment apparatus which has a simple apparatus configuration and which can reduce the volume and concentration of wastewater by continuous treatment.

[0010]

The structure of the present invention which solves the above-mentioned problems, is to inject waste water, and to generate ice when the supercooled wastewater collides with the supercooling release plate and the supercooled wastewater. Is supplied to the ice-making tank, ice and waste water in the ice-making tank is supplied, a separator that mechanically separates the ice and the wastewater, and the wastewater separated by the separator is supercooled and supercooled. And a heat exchanger for producing supercooled water, which sends the wastewater to the supercooling release plate.

Further, the constitution of the present invention is characterized in that, in the freeze-concentration type wastewater treatment device, it has an ice-melting heat exchanger for melting the ice separated by the separator.

Further, the structure of the present invention is characterized in that waste water is also supplied from the ice making tank to the supercooled water manufacturing heat exchanger.

Further, the configuration of the present invention is characterized in that the separator is a centrifugal separator.

According to the structure of the present invention, the ice melting heat exchanger melts ice by using the waste liquid before being supplied to the ice making tank as a heat exchange fluid, and the waste water after the heat exchange is stored in the ice making tank. It is characterized by being injected.

In the freeze-concentration type wastewater treatment device of the present invention, an ice heat storage tank for accumulating the ice separated by the separator and water melted in the ice heat storage tank are used as a heat exchange fluid. It has a heat exchanger for air conditioning which cools air by using it.

Further, the structure of the present invention is characterized in that water formed by melting the ice separated by the separator is used as intermediate water.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

<First Embodiment> FIG. 1 shows a first embodiment of the present invention.
1 shows a freeze-concentration type wastewater treatment device according to the embodiment of the present invention.
This freeze-concentration type wastewater treatment device is a device that dynamically generates sherbet-like ice using supercooled water and mechanically separates the generated ice.

As shown in FIG. 1, in the freeze-concentration type waste water treatment apparatus according to the first embodiment, a stirring blade 12 is provided in an ice making tank 11, and a waste water H is passed through a pipe 13.
Is supplied. The wastewater H targeted in the present embodiment is assumed to be equal to or higher than the discharged water quality standard regulation defined by the Water Pollution Control Law, the Sewerage Law, and the like.

A supercooling release plate 14 is arranged above the inner peripheral wall of the ice making tank 11. Then, the waste water H supercooled by the supercooled water manufacturing heat exchanger 15 becomes the ice making tank 1
1, and is injected toward the supercooling release plate 14. The supercooled wastewater H collides with the supercooling release plate 14 to instantaneously generate ice I on a part thereof, and the generated sherbet-shaped ice I and the supercooled wastewater H as a liquid are generated. It is supplied into the ice making tank 11. Therefore, in the ice making tank 11, the waste water H (the waste water supplied from the pipe 13 and the waste water supplied from the subcooling water manufacturing heat exchanger 15) and the ice I are mixed, and the waste water H and the ice I are mixed. It is stirred by the stirring blade 12.

The mixed liquid of waste water H and ice I is supplied to the centrifuge 16. The centrifuge 16 has a cylindrical rotating portion formed of, for example, a mesh material, and the mixed liquid of the waste water H and the ice I is put into the cylindrical rotating portion. At this time, when the cylindrical rotating portion rotates at high speed, the wastewater H passes through the cylindrical rotating portion which is a mesh material, and the ice I adheres to the inner peripheral surface of the cylindrical rotating portion. As a result, the waste water H and the ice I can be mechanically separated. Ice I is a clear ice crystal and contains no impurities. Therefore, by separating the ice I, the water content in the wastewater H decreases, and the concentration of the wastewater H increases accordingly.

Instead of the centrifuge 16, a compressor or the like may be used to mechanically separate the waste water H and the ice I.

The waste liquid H separated by the centrifugal separator 16 is supplied to the supercooled water manufacturing heat exchanger 15. When the flow rate of the waste water H is insufficient, the shortage is supplied from the ice making tank 11 to the supercooled water production heat exchanger 15. The supercooled water production heat exchanger 15 supercools the wastewater H with brine. Since the wastewater H contains impurities, its freezing point is lower than 0 ° C. Therefore, the wastewater H is -1.5 to -2.0 ° C.
Supercooled by cooling to about C. As described above, the waste water H supercooled in this way is cooled by the supercooling release plate 14 as described above.
Is collided with and the supercooling is released to make ice, and ice I is produced.

On the other hand, the ice I separated by the centrifugal separator 16
Is supplied to the ice-melting heat exchanger 17 and melted in the ice-melting heat exchanger 17 to become the melted water W. The concentration of dirt in the melted water W becomes equal to or lower than the discharge water quality standard regulation, and is discharged to the discharge regulation place defined by the law.

In this way, only the water is removed from the wastewater H by ice I.
Since the ice I is discharged as the melted water W, the waste water H is concentrated, and the concentrated waste water H finally remains in the ice making tank 11, but the amount of waste water H is 1
The volume can be reduced to about / 10, and the processing cost can be reduced.

In this freeze concentration type waste water treatment device,
By making the amount of the waste water H input through the pipe 13 the same as the amount of the ice I (in other words, the melted water W) to be discharged, continuous processing becomes possible.

As described above, in the freeze-concentration type wastewater treatment apparatus according to the first embodiment, the treatment cost can be reduced by reducing the volume of the wastewater H, and the number of machine points can be reduced to reduce the apparatus manufacturing cost. In addition, continuous processing is possible.

<Second Embodiment> FIG. 2 shows a second embodiment of the present invention.
1 shows a freeze-concentration type wastewater treatment device according to the embodiment of the present invention.
In the freeze concentration type waste water treatment device according to the second embodiment, the waste water H before being poured into the ice making tank 11 is used as the heat exchange fluid of the ice melting heat exchanger 17. Therefore, the waste liquid H injected into the ice making tank 11 passes through the ice melting heat exchanger 17 and is heat-exchanged with the ice I, so that the waste liquid H is preliminarily cooled and is also transferred from the centrifugal separator 16 to the ice melting heat exchanger 17. The ice I sent in is efficiently melted by the heat of the waste liquid H. Therefore, latent heat for melting ice I and latent heat for lowering the temperature of wastewater H are not required, and the thermal efficiency of the entire apparatus is improved. The configuration and operation of the other parts are the same as those of the first embodiment shown in FIG.

<Third Embodiment> FIG. 3 shows a third embodiment of the present invention.
1 shows a freeze-concentration type wastewater treatment device according to the embodiment of the present invention.
In the freeze-concentration-type wastewater treatment device according to the third embodiment, when the water quality of the melted water W obtained by melting the ice I in the ice-melting heat exchanger 17 is a water quality that can be used as intermediate water, this melted water W is used as tap water 20. Like this 2
Since it is used as 0, the water charge can be reduced. The configuration and operation of the other parts are similar to those of the second embodiment shown in FIG.

<Fourth Embodiment> FIG. 4 shows a fourth embodiment of the present invention.
1 shows a freeze-concentration type wastewater treatment device according to the embodiment of the present invention.
The freeze-concentration type wastewater treatment device according to the fourth embodiment includes an ice heat storage tank 31 and an air conditioning heat exchanger 32.
The ice-melting heat exchanger 17 used in the first to third embodiments shown in FIGS. 1 to 3 is not used.

In the fourth embodiment, the ice I separated by the centrifugal separator 16 is transported and stored in the ice heat storage tank 31. The ice I melts in the ice heat storage tank 31. Therefore, when cooling is required, the melted water is used as a heat exchange fluid and is circulated to the air conditioning heat exchanger (fan coil unit, etc.) 32, and the air is cooled by the air conditioning heat exchanger 32 to perform air conditioning. be able to. The water whose temperature has risen after passing through the air conditioning heat exchanger 32 is dropped onto the ice I from above the ice heat storage tank 31, and the melting of the ice I proceeds. In this way, the use of cold heat of ice can reduce the cost of air conditioning.

Further, when medium water is required, the ice heat storage tank 3
The melted water can be extracted from 1 and used as the inside water 33. The configuration and operation of the other parts are the same as those of the above-described embodiment.

[0033]

As described above in detail with the embodiments, in the present invention, the waste water is injected, and the supercooled waste water collides with the supercooling release plate and is supercooled. An ice making tank to which waste water is supplied, a separator to which ice and waste water in the ice making tank are supplied and which mechanically separates the ice and the waste water, and the waste water separated by the separator are supercooled and A supercooled water producing heat exchanger for sending cooled wastewater to the supercooling release plate is provided. Therefore, the number of equipment can be reduced to reduce the cost of the apparatus, and the volume reduction / concentration treatment of the wastewater can be continuously performed.

Further, according to the present invention, the freeze-concentration type wastewater treatment device has an ice melting heat exchanger for melting the ice separated by the separator. For this reason, the water in which the ice has been melted can be easily discharged to the outside.

Further, in the present invention, waste water is supplied from the ice making tank to the supercooled water producing heat exchanger. Therefore, continuous processing can be effectively performed.

In the present invention, the separator is a centrifuge. Therefore, the separation of ice and waste water can be performed reliably and efficiently.

In the present invention, the ice melting heat exchanger is
The waste liquid before being supplied to the ice making tank is used as a heat exchange fluid to melt the ice, and the waste water after heat exchange is injected into the ice making tank. Therefore, the thermal efficiency of the entire device is improved.

Further, in the present invention, in the freeze-concentration type wastewater treatment device, an ice heat storage tank for accumulating ice separated by the separator and water melted in the ice heat storage tank are used as a heat exchange fluid. And a heat exchanger for air conditioning for cooling the air. Therefore, air conditioning can also be performed.

In the present invention, water formed by melting ice separated by the separator can be used as intermediate water. Therefore, the water charge can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a freeze-concentration type wastewater treatment device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a freeze-concentration type wastewater treatment device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a freeze-concentration type wastewater treatment device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a freeze-concentration type wastewater treatment device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional freeze-concentration type wastewater treatment device.

[Explanation of symbols]

1 heat exchanger 2 Ice grain aging tank 3 confluence tank 4 Ice scraping heat exchanger 5 Ammonia refrigerator 6 Ice cleaning section 11 Ice making tank 12 stirring blades 13 pipes 14 Supercooling release plate 15 Supercooled water production heat exchanger 16 centrifuge 17 Ice melting heat exchanger 20 Middle water 31 ice heat storage tank 32 Air conditioner heat exchanger 33 Middle water

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoki Ogawa             2-1-1 Niihama, Arai-cho, Takasago City, Hyogo Prefecture             Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Naoyuki Uejima             2-1-1 Niihama, Arai-cho, Takasago City, Hyogo Prefecture             Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. F-term (reference) 4D037 AA11 BA21 CA02

Claims (7)

[Claims] 1. An ice making tank into which waste water is injected, and ice produced by collision of supercooled waste water with a supercooling release plate and supercooled waste water are supplied, and ice in the ice making tank. Wastewater is supplied, a separator that mechanically separates ice and wastewater, and supercooling the wastewater separated by the separator, and sending the supercooled wastewater to the subcooling release plate A freeze-concentration type wastewater treatment device, comprising: an exchanger. 2. In the freeze concentration type wastewater treatment device,
The freeze-concentration type wastewater treatment device according to claim 1, further comprising an ice-melting heat exchanger that melts the ice separated by the separator. 3. The freeze-concentration type wastewater treatment device according to claim 1, wherein wastewater is also supplied from the ice making tank to the supercooled water production heat exchanger. 4. The freeze-concentration type wastewater treatment device according to claim 1, wherein the separator is a centrifugal separator. 5. The ice melting heat exchanger melts ice by using waste liquid before being supplied to the ice making tank as a heat exchange fluid, and waste water after heat exchange is injected into the ice making tank. The freeze-concentration type wastewater treatment device according to any one of claims 2 to 4. 6. The freeze-concentration type wastewater treatment device,
An ice heat storage tank for accumulating ice separated by the separator, and an air conditioning heat exchanger for cooling air using water melted in the ice heat storage tank as a heat exchange fluid, The freeze-concentration type wastewater treatment device according to any one of claims 1 or 3 or 4. 7. The freeze-concentration type wastewater treatment device according to claim 1, wherein water produced by melting ice separated by the separator is used as intermediate water.