KR20200122746A - Water treatment apparatus - Google Patents

Abstract

An embodiment of the present invention provides a water treatment apparatus for mixing and dissolving gas and input water by injecting the gas into the input water. The water treatment apparatus includes: an input module including an inlet pipe through which water flows, and a gas injection unit connected to the inlet pipe to inject pressure gas into the water introduced through the inlet pipe; and an output module including a diffusion pipe connected to the inlet pipe and having a plurality of openings formed in a pipe wall, and a cylindrical outer chamber surrounding the diffusion pipe, wherein water is moved between the inside of the diffusion pipe and the outer chamber through the plurality of openings to form a turbulent flow, thereby increasing and discharging the amount of mixing and dissolution of the gas into water.

Description

Water treatment device {WATER TREATMENT APPARATUS}

The present invention relates to a water treatment device, and more particularly, to a water treatment device for improving the mixing and dissolution of water and gas.

In general, a water treatment device is a variety of devices for appropriately treating raw water to produce fresh water using seawater and use it as household water, drinking water or industrial water, or to purify wastewater. This water treatment device includes a device for removing foreign substances mixed with raw water.

In order to remove foreign matter, a method using fine air bubbles can be used. There are various flotation processes depending on the method and principle of generating air bubbles, but in the general water treatment field, the Dissolved Air Floatation (DAF), which generates fine bubbles by rapidly dropping the pressure after supersaturating the circulating water at high pressure, is used. Is being used.

As a unit process for removing foreign substances, the dissolved air levitation method is a device that agglomerates foreign substances contained in raw water by mixing a coagulant with raw water to be treated, and floats and removes the agglomerated foreign substances together with fine bubbles. , It is applied as a pretreatment process in all water treatment facilities or seawater desalination facilities.

Unlike the precipitation process, the DAF process has a disadvantage in that it requires high energy because it requires a device that generates bubbles. However, compared to the gravity-type precipitation process, it is possible to reduce the amount of coagulant used in the water treatment process and the amount of sludge generated during the water treatment process.

In addition, as fast solid-liquid separation is possible, a high hydraulic load factor can be applied, so that the same quantity of water can be treated with a flotation tank that is much smaller than the existing settling basin, thereby reducing construction costs.

In addition, it is known that the concentration of residual coagulant in the flotation treated water is lower than that of the general sedimentation process, and the treated water quality is good even at a water temperature of 4 ℃ or lower.

Due to these many advantages, the use of DAF devices is gradually expanding despite the circulation and saturation devices, power ratios, and rather complex operating conditions.

1 is a diagram showing an example of a conventional DAF system. Referring to FIG. 1, in a conventional dissolved air flotation apparatus, a flocculant is added to influent water to agglomerate low-density suspended solids such as algae or organic compounds or particulate matter or suspended matter contained in influent water. In a flocculation basin (1), the influent water into which the flocculant is added is mixed through a stirrer, and the size of the floc is grown to a size suitable for flotation.

The term "floc" refers to a large mass obtained by agglomerating fine particles such as suspended substances, organic substances, and microorganisms in raw water with a coagulant, and generally refers to an aggregate in which particles of 0.1 μm or more are agglomerated. Flocks having a small size or density that cannot be removed through filtration or precipitation are removed by floating on the water surface using the dissolved air levitation method.

The floc generated and grown in the coagulation tank (1) flows into the contact zone (2), collides with and combines with the microbubbles generated in the bottom, and floats, scum in the separation zone (3). It is removed through a (scum) removal device.

Meanwhile, in the existing dissolved air flotation device, a part of the final product, treated water, is separated by a pipe, and compressed air of 4 to 7 bar is supplied to saturate it, and the nozzle 4 installed at the bottom of the contact tank 2 ) To create a rapid pressure drop through the contact tank (2).

Factors that influence the efficiency of the DAF process include various factors such as the amount of bubble generated, the size of the bubble, and the collision efficiency between the bubble and the floc.

Among them, one of the factors that greatly influences the efficiency is the bubble size. In the DAF process, the smaller the bubble size, the higher the collision efficiency between the bubble and the floc in the contact step, and several bubbles are attached to one floc, so that the ascending speed of the floc bubble assembly is accelerated, thereby increasing the separation efficiency.

That is, a small bubble increases the number of bubbles attached to the floc bubble assembly due to the high collision efficiency, so that the ascending speed increases as much as a large bubble. Therefore, it can be concluded that a bubble generating device capable of generating small bubbles is advantageous in improving the efficiency of the process.

In order to generate small bubbles, not only a lot of energy and precise manipulation are required, but also the method for controlling the size of the bubbles is limited. In order to be able to generate a large amount of fine air bubbles, it is necessary to improve the efficiency of dissolving air in water when compressed air is supplied to water to saturate it.

An object of the present invention is to provide a water treatment device that stably and efficiently mixes and dissolves air in water when saturating water with compressed air to generate microbubbles.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

In order to achieve the above technical problem, an embodiment of the present invention provides a water treatment apparatus in which gas is injected into influent water to mix and dissolve. The water treatment apparatus includes an input module including an inlet pipe through which water is introduced, and a gas injection unit connected to the inlet pipe and injecting a pressure gas into the water flowing through the inlet pipe; And a diffusion tube having a plurality of openings formed on the tube wall as a tube connected to the inlet tube, and a cylindrical outer chamber surrounding the diffusion tube, wherein water is passed through the plurality of openings to the inside of the diffusion tube and the outer chamber. It includes; an output module that moves between and forms a turbulent flow, increasing the amount of mixing and dissolution of the gas into water and discharging it.

In an embodiment of the present invention, each opening of the plurality of openings may include a diffusion nozzle.

In an embodiment of the present invention, the gas injection unit includes: an air chamber surrounding the inlet pipe so that the front of the inlet pipe is exposed; And a gas injection unit in communication with the air chamber to supply the pressure gas into the air chamber.

In an embodiment of the present invention, the input module includes: a bottleneck portion connecting the inlet pipe and the diffusion pipe in the air chamber; And it may further include a; spray nozzle installed in the bottle neck to inject the gas in the air chamber injected through the gas injection portion to the inside of the bottle neck.

In an embodiment of the present invention, the outer chamber includes: a tube portion receiving the diffusion tube inside and spaced apart from the diffusion tube; A front flange portion extending from one end of the tube portion and coupled to the air chamber; And as a plate-shaped member formed at the other end of the tube, a rear plate having an outlet of water at a position spaced apart from the diffusion pipe; may include.

In an embodiment of the present invention, the output module includes an additional outer chamber coupled to the rear plate; And an additional diffusion tube accommodated in the additional outer chamber and drawn out to the rear of the outer chamber, and having a plurality of openings formed in the tube wall. Water is introduced into the additional outer chamber through the outlet of the rear plate, and may be moved between the additional diffusion tube and the additional outer chamber through the plurality of openings of the additional diffusion tube.

In an embodiment of the present invention, the output module may include a turbulent melting chamber in which a plurality of unit modules including the outer chamber and the diffusion pipe are connected in series.

In an embodiment of the present invention, a bearing interposed between the diffusion tube and the air chamber so that the diffusion tube can rotate may further include.

In an embodiment of the present invention, the bottleneck portion includes a portion whose diameter decreases in a direction from the inlet pipe side toward the diffusion pipe and a portion whose diameter increases, and the injection nozzle increases the diameter of the bottleneck portion. Can be installed on the part.

In an embodiment of the present invention, the gas injection unit may further include a pressure sensor installed in the air chamber to control the supply of pressure gas to the gas injection unit and gas injection of the injection nozzle.

According to an embodiment of the present invention, when water is saturated with compressed air to generate microbubbles, due to the special structure of the turbulent dissolution chamber, the air is stably mixed and dissolved in the water, and by the turbulent dissolution chamber of the multi-row structure It is possible to provide a water treatment apparatus capable of adjusting the size of fine bubbles.

In addition, automatic control can be achieved by a pressure sensor or a pressure switch when compressed air is injected into the water.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a diagram showing an example of a conventional DAF system.
2 is a view showing a water treatment apparatus according to an embodiment of the present invention.
3 is a view showing a water treatment apparatus according to another embodiment of the present invention.
4 is a view showing a water treatment apparatus according to another embodiment of the present invention.
5 is a view showing a water treatment apparatus according to another embodiment of the present invention.
6 is a view showing a water treatment apparatus according to another embodiment of the present invention.
7 is a view showing a water treatment apparatus according to another embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and therefore is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, bonded)" with another part, it is not only "directly connected", but also "indirectly connected" with another member in the middle. "Including the case. In addition, when a part "includes" a certain component, it means that other components may be further provided, rather than excluding other components unless specifically stated to the contrary.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing a water treatment apparatus according to an embodiment of the present invention.

The water treatment device of this embodiment is a device that improves the efficiency of mixing or dissolution between water and gas (e.g., air), and a unit process of saturating compressed air with water to generate fine bubbles in a system such as DAF. It can be used as a performing device.

The water treatment apparatus may include an input module 100 and an output module 300.

The input module 100 includes an inlet pipe 110 through which water is introduced, and a gas injection unit 130 connected to the inlet pipe 110 and supplying a pressure gas to the water introduced through the inlet pipe 110. can do.

The water flowing into the inlet pipe 110 may be circulating water for generating microbubbles or water to be treated with flocs, as described in FIG. 1.

The output module 300 may include a diffusion tube 310 and an outer chamber 320.

The diffusion pipe 310 is a pipe having one side connected to or in communication with the inlet pipe 110 of the input module 100 and may be a passage for the influent water W1. A plurality of openings 311 may be formed in the tube wall of the diffusion tube 310. The plurality of openings 311 may be simply openings or may include nozzles.

The outer chamber 320 may have a cylindrical shape surrounding the diffusion tube 310. Accordingly, the tube wall of the diffusion tube 310 and the side wall of the outer chamber 320 are spaced apart from each other, and this spaced space is referred to as a chamber space.

The water injected with air diffuses into the chamber space through the plurality of openings 311 formed in the diffusion pipe 310, collides at the sidewall of the chamber, and then flows back into the diffusion pipe 310 through the plurality of openings 311 Turbulent flow is formed inside the output module 300 according to the movement of water, and the amount of air dissolved in water or efficiency of dissolution may increase.

Alternatively, when the influent W1 includes flocs, collision efficiency between the flocs and microbubbles may be improved due to the formation of turbulence as described above.

In this embodiment, the other side of the diffusion pipe 310 may protrude to the rear of the outer chamber 320, and water in which air is mixed or dissolved may be discharged to the other side of the diffusion pipe 310.

When the pressure of water discharged from the diffusion pipe 310 is rapidly lowered, a large amount of fine bubbles may be generated due to air dissolved in water. Alternatively, the pressure may be adjusted to generate fine bubbles in the output module 300 of the water treatment apparatus.

The water treatment apparatus of the present embodiment injects a gas such as air into the influent W1 by applying pressure, greatly improves the amount of air dissolved in water, or dissolves air in water with improved efficiency, and then water (W2) Can be discharged.

3 is a view showing a water treatment apparatus according to another embodiment of the present invention.

The water treatment apparatus of the present embodiment is substantially the same as the water treatment apparatus described in FIG. 2 except for the gas injection unit 130 and the output module 300, and thus a duplicate description will be omitted.

As illustrated in FIG. 3, the gas injection unit 130 includes an air chamber 131 surrounding the inlet pipe 110 so that the front of the inlet pipe 110 is exposed, and the pressure gas into the air chamber 131. It may include a gas injection unit 133 communicated to the air chamber 131 for supply.

The inlet of the inlet pipe 110 is drawn out to the front of the air chamber 131, and the inlet pipe 110 and the diffusion pipe 310 of the output module 300 may be connected in the inner space of the air chamber 131. .

The water treatment apparatus of this embodiment forcibly contacts air and water in a pressurized state in order to saturate or dissolve water with air, and the pressure of the contact portion of the gas and liquid may be an important driving factor of the water treatment apparatus.

Pressure air A1 may be supplied from a pressure tank or the like to the gas injection unit 133. The pressure air A1 supplied through the gas injection part 133 may contact water at the contact part.

In order to inject gas into water, it may be necessary to control the pressure of the contact portion between the gas and the liquid, and a contact portion between the water and air may be formed in the inlet pipe 110 inside the air chamber 131, and the contact portion It may be an injection nozzle 111.

In this embodiment, the other end of the diffusion pipe 310 of the output module 300 may be shielded by the rear wall of the outer chamber 320. A water outlet 3251 may be formed on the rear wall of the outer chamber 320 at a location spaced apart from the diffusion pipe 310.

Turbulence is formed as water diffuses and moves into the diffusion tube 310 and the chamber space through the plurality of openings 311 formed in the diffusion tube 310, and the efficiency of mixing or dissolving air with water is greatly improved, Water in which air is dissolved in this way may be discharged through the outlet 3251 formed in the thick wall of the outer chamber 320.

4 is a view showing a water treatment apparatus according to another embodiment of the present invention. 5 is a view showing a water treatment apparatus according to another embodiment of the present invention.

In the water treatment apparatus of this embodiment, in the air chamber 131, the inlet pipe 110 of the input module 100 and the diffusion pipe 310 of the output module 300 are connected by a bottleneck portion 150. The water treatment apparatus described in FIG. 3 and the water treatment apparatus described in FIG. Since they are substantially the same, duplicate descriptions are omitted.

4 and 5, the input module 100 may further include a bottleneck 150. The bottleneck 150 may connect the inlet pipe 110 and the diffusion pipe 310 in the air chamber 131. The bottleneck 150 may have a shape that decreases and then increases in diameter, and a multi-injection nozzle 151 for injecting gas into water may be provided at a portion of the bottleneck 150 that increases in diameter.

Pressurized air is supplied into the air chamber 131 through the gas injection unit 133, and the pressure air is injected into water by the multi-injection furnaces, so that gas may be introduced into the water.

The gas injection unit 130 may further include a pressure sensor installed in the air chamber 131 to control the supply of pressure air A1 to the gas injection unit 133 and gas injection of the multi-injection nozzle 151. have.

In this embodiment, the output module 300 has a multi-row mixing chamber structure in which two modules composed of an outer chamber 320 and a diffusion pipe 310 are connected.

The first module may include an outer chamber 320 and a diffusion pipe 310 provided inside the outer chamber 320. The plurality of openings 311 formed in the diffusion pipe 310 may include a diffusion nozzle.

The outer chamber 320 of the first module accommodates the diffusion tube 310 inside and extends from a tubular portion or cylindrical portion 321 spaced apart from the diffusion tube 310 and from one end of the tube portion 321 A front flange portion 323 coupled to the air chamber 131 and a rear plate having a water outlet 3251 formed at a position spaced apart from the diffusion pipe 310 as a plate-shaped member formed at the other end of the tube portion 321 (325) may be included.

The second module includes an additional outer chamber 340 coupled to the rear plate 325 of the outer chamber 320 of the first module, and is accommodated in the additional outer chamber 340 and is rear of the additional outer chamber 340. It is drawn out and may include an additional diffusion tube 330 having a plurality of openings formed in the tube wall.

Water may be introduced into the additional outer chamber 340 through the outlet 3251 of the rear plate 325 of the first module, and the additional diffusion pipe 330 through a plurality of openings of the additional diffusion pipe 330 ) And the additional outer chamber 340 may form turbulence.

As described above, in the present embodiment, the output module 300 may be formed by serially connecting a plurality of unit modules including an outer chamber and a diffusion tube, and such an output module connected in series may be referred to as a turbulent melting chamber.

6 is a view showing a water treatment apparatus according to another embodiment of the present invention.

In the present embodiment, the water treatment apparatus is substantially the same as the water treatment apparatus described in FIGS. 4 and 5 except that the output module 300 is configured in three rows or three stages, and thus a duplicate description will be omitted.

In this embodiment, the output module 300 includes a first module, a second module, and a third module. Each module may include diffusion tubes 310, 330, and 350 inside the outer chambers 320, 340, and 360 and the outer chambers 320, 340, and 360. Each of the diffusion tubes 310, 330, and 350 may have a plurality of openings formed in the tube wall, and the plurality of openings may be simple openings or may include a diffusion nozzle.

The first module may be coupled to the air chamber 131, the second module may be coupled to the first module, and the third module may be coupled to the second module. In the rear plate of the first module, a water outlet 3251 may be formed at a position spaced apart from the diffusion pipe 310, and a water outlet may be formed at a position spaced apart from the diffusion pipe in the rear plate of the second module. The rear plate of the third module may be penetrated by the diffusion tube.

By forming the turbulent flow dissolution chamber with the output module 300 in a multi-row structure, the efficiency of dissolving air in water can be improved, and the output module 300 having a multi-row structure is also used to control the size of microbubbles. Can have an effect.

According to the specifications and needs of the DAF system, the number of connected modules can be adjusted and used.

7 is a view showing a water treatment apparatus according to another embodiment of the present invention.

The water treatment device of the present embodiment is substantially the same as the water treatment device described in FIGS. 4 and 5 except that the diffusion pipe 310 is rotated, and therefore, a duplicate description will be omitted.

As illustrated in FIG. 7, a bearing 400 may be further provided between the diffusion tube 310 and the front flange portion 323 of the outer chamber 320 or between the diffusion tube 310 and the rear plate 325. I can.

Due to the bearing 400, the diffusion pipe 310 may be rotated by a rotational force transmitted from the outside. Water in which water and air are mixed into the diffusion pipe 310 may become more turbulent by the rotation of the diffusion pipe 310, and the solubility of the gas may be further improved.

The bearing 400 may be added to each module of the output module 300, and may be provided between the inlet pipe 110 and the air chamber 131 so that the inlet pipe 110 may be rotated. When the inlet pipe 110 rotates, the bottleneck 150 also rotates, and while the multi-injection nozzle 151 rotates, pressure air may be injected into the inlet water W1.

In addition, although the water treatment device in FIGS. 2 to 6 is illustrated horizontally, the horizontal illustration is not limited to that the water treatment device is disposed or installed only horizontally, as shown in FIG. 7 according to the needs of the DAF system. They can be arranged or designed vertically together.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

100: input module
110: inlet pipe
130: gas injection unit
131: air chamber
133: gas injection part
150: bottleneck
151: multiple injection nozzle
300: output module
310: diffusion tube
311: opening
320: outer chamber
321: Tongbu
323: flange portion
325: rear plate
3251: outlet
400: bearing
A1: pressure air
W1: influent

Claims (10)

In the water treatment device for mixing and dissolving by injecting gas into the influent water,
An input module including an inlet pipe through which water is introduced, and a gas injection unit connected to the inlet pipe and injecting pressure gas into the water flowing through the inlet pipe; And
As a pipe connected to the inlet pipe, a diffusion pipe having a plurality of openings formed on a wall of the pipe, and a cylindrical outer chamber surrounding the diffusion pipe, wherein water is passed through the plurality of openings to the inside and the outer chamber of the diffusion pipe. And an output module that is moved between and forms a turbulent flow to increase and discharge the amount of the gas to be mixed and dissolved in water.
The method of claim 1,
Each opening of the plurality of openings includes a diffusion nozzle.
The method of claim 1,
The gas injection unit,
An air chamber surrounding the inlet pipe so that the front of the inlet pipe is exposed; And
And a gas injection unit in communication with the air chamber to supply pressure gas into the air chamber.
The method of claim 3,
The input module is
A bottleneck portion connecting the inlet pipe and the diffusion pipe in the air chamber; And
And a spray nozzle installed on the bottle neck to inject the gas in the air chamber injected through the gas injection unit into the bottle neck.
The method of claim 3,
The outer chamber,
A tube portion receiving the diffusion tube inside and spaced apart from the diffusion tube;
A front flange portion extending from one end of the tube portion and coupled to the air chamber; And
And a plate-shaped member formed at the other end of the barrel, and a rear plate having an outlet for water at a position spaced apart from the diffusion pipe.
The method of claim 5,
The output module,
An additional outer chamber coupled to the rear plate; And
An additional diffusion tube accommodated in the additional outer chamber and drawn out to the rear of the outer chamber, and having a plurality of openings formed in the tube wall; further includes,
Water treatment apparatus, characterized in that water flows into the additional outer chamber through the outlet of the rear plate, and moves between the additional diffusion pipe and the additional outer chamber through the plurality of openings of the additional diffusion pipe. .
The method of claim 4,
The output module,
A water treatment apparatus, wherein a plurality of unit modules including the outer chamber and the diffusion pipe include a turbulent flow dissolution chamber connected in series.
The method of claim 4,
And a bearing interposed between the diffusion tube and the air chamber so that the diffusion tube can rotate.
The method of claim 4,
The bottleneck portion includes a portion whose diameter decreases in a direction from the inflow pipe side toward the diffusion pipe and a portion whose diameter increases,
The spray nozzle is a water treatment apparatus, characterized in that installed at a portion of the bottle neck portion of which the diameter increases.
The method of claim 4,
The gas injection unit,
And a pressure sensor installed in the air chamber to control supply of pressure gas to the gas injection unit and injection of gas from the injection nozzle.

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