KR200178928Y1 - A dissolved air floatation water purifying system - Google Patents

Abstract

The present invention is capable of separating and removing foreign substances such as oil or sludge in waste water by using a pressure tank equipped with an ejector and a floating separator having a separator plate assembly formed by stacking a pressure valve and an egg plate-shaped separator plate up and down. The present invention relates to a dissolved air flotation type water treatment device, which increases the amount of dissolved air in pressurized water and efficiently mixes pressurized water and treated water to effectively separate and remove contaminants such as oil or sludge in water. As it is possible to obtain a much improved water treatment efficiency than the conventional water treatment machine, it is possible to effectively treat the waste water, and the water treatment through the separation plate assembly is easy to clean and easy maintenance of the water treatment device. The effect which makes it possible is obtained.

Description

Dissolved Air Floating Type Water Treatment System {A DISSOLVED AIR FLOATATION WATER PURIFYING SYSTEM}

The present invention relates to a dissolved air flotation type water treatment device, and in particular, a pressurized tank equipped with an ejector, a pressure valve, and a floating plate including a separator plate composed by stacking up and down a separator plate in the form of an egg plate. The present invention relates to a dissolved air flotation type water treatment device capable of separating and removing foreign substances such as oil and sludge.

In the conventional wastewater treatment process, a coagulation sedimentation method is adopted as a primary treatment method. However, the coagulation sedimentation method requires a large area of the sedimentation tank, which is expensive for site and construction, and takes a long time to settle. In addition, colloidal substances in water can be removed by flocculation precipitation, but there is a problem that nutrients having a small molecular weight such as nitrogen and phosphorus are not removed.

In order to solve this problem, a dissolved air flotation type water treatment method has been adopted. The dissolved air flotation type water treatment method does not require a large area, such as a precipitation tank in the coagulation precipitation method, and can be treated in a short time.

The conventional dissolved air flotation water treatment method uses pressurized pump of high head to make pressurized water, mixes air by air compressor and stays in pressurized tank for a certain time to saturate air in pressurized water. When supplied into the floating separation tank in the state, when the pressurized water was decompressed to atmospheric pressure in the floating separation tank, fine bubbles were formed in the water, and the suspended solids in the water were adsorbed on the surface to float on the water to purify the waste water.

At this time, in order to sufficiently dissolve air in pressurized water, "Henry's law" was applied to obtain low temperature and high pressure. In other words, if the air is dissolved a lot and the air amount (a) is larger than the suspended solids (s) to increase the ratio of air to solids (a / s), the floating separation is better. A large amount of air was introduced, and air was saturated in water as much as possible, so that a large amount of bubbles were generated when discharged under atmospheric pressure by a pressure valve.

At this time, however, even if the a / s ratio is high, the number of bubbles generated decreases and the size increases. The rising speed of solids is proportional to the square of the diameter of solids, and the smaller the specific gravity of solids, the better the rise. Only particles are injured.

However, if air bubbles are very finely dispersed in the pressurized water, more air bubbles are generated in the floating separation tank, so as to adsorb and float all the fine particles as well as the fine particles, and when the bubble size is reduced to 1/100, The number is increased by one million times, so that the separation of injuries is perfect.

Dissolved air flotation type water treatment apparatus as described above has been mainly used a method of directly supplying air to the raw water of the sealed pressure tank by generating compressed air with an air compressor in order to convert the waste water raw water into pressurized circulating water.

However, in this case, the bubbles are not sufficiently melted and large air bubbles are supplied to the flotation tank as they are, and large air bubbles cause vortexing and foreign substances such as oil or sludge cannot be properly injured. In addition, since the raw waste water and air are kept separate and mixed, only bubbles are expanded in the floating separation tank under atmospheric pressure. There was a problem that is insufficient to effectively separate the foreign matter.

In addition, in the conventional method, since the air is directly injected into the sealed pressure tank, the pressure tank becomes too large, which lowers the efficiency of pressurization, and there is a problem in economics as well.

The present invention is devised to solve the problems as described above, an object of the present invention is to increase the dissolved air volume of the pressurized water by using a pressurized tank using an ejector, and pressurized water and treated water through a pressure valve It is to provide a dissolved air flotation type water treatment device that efficiently mixes and separates and removes foreign substances such as oil and sludge in water through the action of a separator and a bubble formed by stacking a separator plate in the form of an egg plate. .

1 is a schematic view showing the overall configuration of the dissolved air flotation water treatment apparatus according to the present invention,

Figure 2 is a cross-sectional view showing the structure of the pressure valve of the dissolved air flotation water treatment apparatus according to the present invention,

Figure 3 is a perspective view showing the structure of the separator plate assembly installed in the floating separation tank of the dissolved air floating water treatment apparatus according to the present invention,

4 is a cross-sectional view showing a cross section taken along the line A-A of FIG.

5 is a view showing the principle of water treatment by the egg plate-shaped separator constituting the separator plate assembly of FIG.

<Description of the code | symbol about the principal part of drawing>

100 ... Pressure tank 11 ... Tank part

13 ... U-shaped tube 15 ... Nozzle

17 Bends 19 Air intake

21 ... Ejector 23 ... Bubble removal unit

25 Pressurized circulating water supply 27 Air compressor

29 Pressurized pump 31 Pressurized water supply line

33 Pressure gauge 35 Water level control

37 Circulating water supply pipe 200 ... Pressure valve

41 ... Pipe for treatment water 43 ... Blowing hole

45 spout pipe 47 splice pipe

49 Screwdriver 51 Cover

53 ... Pressurized water supply pipe 55 ... Cylinder

57 ... valve disc 59 ... handle

61.Rotating shaft 300 ... Floating tank

71 Compartment plate Separator plate assembly

75 Separator 77 Mount

79 ... Goal 81 ... Oil Hole

83 Sludge Hole 85

87 ... scraping skimmer 89 ... sludge outlet

91 ... treated water outlet 93 ... suspended solids outlet

95 ... Water level regulator

In order to achieve the above object, the present invention is to mix the pressurized water pressurized with compressed air with waste water and to put it in the floating separation tank of atmospheric pressure, and to remove the foreign matter by the adsorption and rise of bubbles in the dissolved air flotation water treatment apparatus In the pressurized tank, the pressurized tank includes a closed tank portion capable of storing a predetermined amount of pressurized water, and an upper end portion of one side thereof is opened upward in a funnel shape, and the other side is bent to form a downward opening portion. An ejector having a female tube and a nozzle inserted into a predetermined position of the U-shaped tube, one end of which communicates with the outside of the tank portion, and the other end of which is opened upward, and an egg plate shape positioned below the ejector The separator comprises a bubble removing unit is laminated, and the pressurized water supply pipe and the water level control unit located below the bubble removing unit It features.

In addition, the present invention comprises a pressurized valve which receives the pressurized water from the pressurized tank and mixes with the water to be treated and ejects it to the flotation tank, wherein the pressurized valve is connected to one side of the pipe for supplying the water to be treated and ejected to the lower end. Cylindrical joint pipe provided with a discharge pipe having a ball, and inserted through the same axis as the joint pipe is installed, the upper end is blocked by a cover formed through the screw hole, the pressurized water supply pipe is communicated to one side, the lower end is opened It is characterized in that it comprises a cylinder of the shape and, through the screw hole of the cylinder is installed to be movable up and down, the lower end portion is formed with a cone-shaped valve disk and a rotating shaft is installed on the top handle.

In addition, the present invention constitutes a floating separation tank for treating the mixed water, wherein the floating separation tank is stacked up and down the egg plate-shaped separation plate having oil holes and sludge holes perforated at the peaks of the mountains and the valleys, respectively. It is formed by, but characterized in that it comprises a separating plate assembly formed by integrally stacking each of the separating plates adjacent to each other up and down half pitch pitch.

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

1 is a schematic view showing the overall configuration of the dissolved air flotation water treatment apparatus according to the present invention.

As shown in the figure, the dissolved air flotation water treatment apparatus according to the present invention is composed of a pressure tank 100, a pressure valve 200 and a floating separation tank (300).

Pressurized tank 100 according to the present invention, as shown in Figure 1, forms a closed tank portion 11 to store a predetermined amount of pressurized water, in the center of the tank portion 11 It is located, the upper end of one side is opened toward the top in a funnel shape, the other side is bent to form a U-shaped tube (13) opening downward.

And it is inserted into a predetermined position of the U-shaped tube 13, one end thereof communicates with the outside of the tank portion 11, the other end is formed with an ejector 21 having a nozzle 15 that opens upwards It is installed, the bubble removing unit 23 is formed by stacking the egg plate-shaped separation plate in the lower part of the ejector 21.

An air compressor 27 and a pressure pump 29 are connected to the pressurized circulating water supply part 25 which is in communication with the outside of the tank part 11 as one end of the ejector 21, and the pressure pump 29 will be described later. It is pumped by receiving the circulating water discharged from the floating separation tank 300, this is injected into the air through the air compressor 27 to supply to the pressure tank (100).

In addition, the lower portion of the bubble removing unit 23 is formed with a pressurized water supply pipe 31 for supplying the pressurized water formed in the pressure tank 100 to the pressure valve 200.

In the upper portion of the pressure tank 100, a pressure gauge 33 is installed to check the pressure in the tank, and a water level control unit 35 is formed and installed, and the air compressor 27 and the circulation water supply pipe 37 and Adjust it so that the water level in the tank is always constant.

2 is a cross-sectional view showing the structure of a pressure valve in the dissolved air flotation water treatment apparatus according to the present invention, wherein the pressure valve 200 is supplied with pressurized water from the pressure tank 100 and mixed with the water to be treated to rise. It serves to eject into the separation tank (300).

As shown in the figure, the pressure valve 200 is a cylindrical joint pipe having a discharge pipe 45 having a discharge hole 43 is connected to the pipe 41 for supplying the treatment object water on one side ( 47).

In addition, the fitting pipe 47 is inserted through the same axis and installed, the upper end is closed by a cover 51 formed through the screw hole 49, the pressurized water supply pipe 31 is communicated to one side, the lower end The cylinder 55 is formed into an opening shape.

A conical valve disk 57 is formed at the lower end in the axial direction of the cylinder 55, and the upper end forms a rotating shaft 61 on which a handle 59 is installed. Through the screw hole 49 of the cover 51 to be exposed to the outside.

The floating separation tank 300 of the dissolved air floating type water treatment device according to the present invention has a similar shape to a general water floating separation tank, and as shown in FIG. 1, a partition plate 71 partitioning the inside of the floating separation tank 300. ), A separator plate assembly 73 for rapidly floating a foreign matter by mixing the ultra-fine air bubbles discharged from the pressure valve 200 and the water to be treated, and a floating material installed on an upper portion of the floating separation tank 300. Scraping skimmer (87) and the floating material discharge port (93) for discharging to the outside and the sludge discharge port (89) and a portion of the treated water installed in the lower portion of the flotation separation tank 300 to discharge the sludge to the outside It consists of a water level control unit (95) for constantly adjusting the water level of the circulating water supply pipe (37) for discharging the discharged water and the treated water outlet (91) and the floating separation tank (300).

Figure 3 is a perspective view showing the structure of the separator plate assembly installed in the floating separation tank of the dissolved air flotation water treatment apparatus according to the present invention, Figure 4 is a cross-sectional view showing a cross-sectional view taken along line AA of Figure 4, As described above, the separator plate assembly 73 is formed by stacking each separator plate 75. The separator plate 75 has oil holes at the apex of the peak 77 and the apex portion of the valley 79, respectively. (81) and the sludge hole 83 is in the form of an egg plate perforated, such a separating plate 75 is stacked up and down, each of the separating plate 75 adjacent up and down is offset half pitch, that is, the upper side The protrusions are formed in the oil hole 81 or the sludge hole 83 on the separation plate 75 which are arranged so as to be located at the valleys of the lower side separation plate, and are arranged up and down. ) And bundle the two ends so that the separator stack, To form an integrated combination ripan 73.

Hereinafter, the operation of the subject innovation of the above configuration and the principle of wastewater treatment in the flotation tank will be described.

First, the circulating water purified by the floating separation tank is supplied to the ejector 21 through the pressurized circulating water supply unit 25 while air is injected through the pressurizing pump 29 and the air compressor 27, which is an ejector ( 25) It is sprayed upwards at high speed through the nozzle 15 of the terminal. At this time, a depressurization state close to vacuum is induced in the bent portion 17 of the U-shaped tube 13 positioned below the nozzle 15 of the ejector 25, whereby the other side of the U-shaped tube 13 is formed. The air is instantaneously sucked through the air intake port 19 of the air, and mixed with the pressurized circulating water from the nozzle 15 to increase the contact efficiency between the pressurized circulating water and the air and eject the air at a higher speed. Through this, the amount of dissolved air in the pressurized circulating water is increased, and the inside of the pressurizing tank 100 is filled with fine bubbles of high pressure and pressurized water.

As described above, the pressurized water mixed with the pressurized circulating water and the air moves downward in the tank part 11 and is excessively passed through the bubble removing part 23 positioned below the ejector 21 during the moving process. Bubbles are removed.

The pressurized water in which air is sufficiently dissolved is discharged to the pressurized water supply pipe 31 installed below the bubble removing unit 23.

On the other hand, the water level control unit 35 installed in the tank portion 11 automatically adjusts the water level of the pressurized water in the tank portion 11. That is, when the water level in the tank 11 is above the proper level, the supply pipe of the interlocked air compressor 27 is blocked to control the inflow of the pressurized tank 100 of the compressed air, and when the water level is below the proper level, the air compressor 27 Open the supply pipe to adjust compressed air. At this time, when the water level control unit 35 is activated and compressed air is introduced, compressed air is mixed into the circulating water.

As described above, the pressurized water supplied through the pressurized water supply pipe 31 moves through the cylinder 55, and the valve disc at the lower end of the rotary shaft 55 is rotated by the rotation of the handle 59 on the upper end of the rotary shaft 61. 57 moves downward to open the cylinder 55, whereby the pressurized water in the cylinder 55 is ejected to the joint pipe 47. In this case, the pressurized water is stagnated under pressure in the cylinder 55 until the valve disc 57 is opened, and is ejected with the opening of the valve disc 57 due to the rotation of the handle 59. Due to the rapid pressure drop of water, it produces a large amount of micro bubbles.

In addition, the treatment object water supplied through the treatment object water supply pipe 41 on one side of the pressure valve 200 is moved through the fitting pipe 47, and the cylinder (at the position where the aforementioned valve disc 57 is installed). 55) it is mixed with the pressurized water sprayed in, thus achieving a state of mixed water in which a large amount of bubbles and treated water are effectively mixed.

The mixed water mixed with a large amount of bubbles and the water to be treated is moved to the spout pipe 45 at the lower end of the joint pipe 47 and jetted to the flotation separation tank 300 through the spout hole 43.

The mixed water jetted into the floating separation tank 300 in the atmospheric pressure state through the pressure valve 200 rises through the partition plate 71 and then moves downward into the floating separation tank 300 to move downward and the separation plate assembly 73. Will pass through.

5 is a view showing the principle of water treatment by the egg plate-shaped separation plate constituting the separator assembly, as shown in the drawing, the water treatment principle is a specific buoyancy of the waste water mixed with foreign substances such as oil or sludge ( And the Stokes' law based on the difference in gravity and the flow of the mixture according to the buoyancy.

The separation plate assembly 73 according to the present invention is the most effective application of the above stock law, a constant flow rate when the mixed water of waste water and pressurized water passes through the valleys 79 of the separation plate 75 stacked up and down Contaminants or fine foreign matters having a specific gravity such as an oil having a light weight are attached to the surface of the micro bubbles in themselves or in the mixed water and float by buoyancy, and the sludge is settled by the specific gravity.

That is, as shown in FIG. 5, light contaminants, such as foreign matters or oil, in which bubbles are adsorbed, are raised on the inner surface of the separation plate 75 and discharged upward through the oil holes 81, on the contrary, sludge. B, the movement of the mixed water is lowered along the outer surface of the separation plate (75).

In this case, the sludge descending along the outer side of the separator plate 75 is sedimented and accumulated downward through the sludge hole 83 formed in the separator plate 75, and then discharged to the outside through the sludge outlet 89 at regular intervals. do.

In addition, contaminants such as foreign matter or oil, which are injured together with bubbles, remain in the surface of the floating separation tank 300, and the surface is discharged through an oil remover such as a scraping skimmer 87, a pipe oil skimmer, and a suction catch. It is removed from and discharged to the outside through the floating material outlet (93).

On the other hand, the water treated in the flotation tank 300 is discharged to the outside through the treated water outlet 91 or a part is supplied to the pressure tank 100 through the circulating water supply pipe 37 as circulating water for recycling.

Effects on the water treatment efficiency according to the present invention made as described above are as follows.

The pressurized tank provided with the ejector according to the present invention can produce pressurized water with an increased amount of dissolved air, and when mixing the pressurized water and the treated water through the pressure valve, the mixed water contains a very large amount of bubbles. It is possible to achieve a much improved water treatment efficiency than the conventional water processor through the water treatment operation through the egg plate-shaped separator plate assembly, which enables effective water treatment of wastewater, as well as to the water treatment through the separator plate assembly. As a result, the water treatment device can be easily cleaned and maintained easily.

Claims (3)

In the dissolved air flotation type water treatment apparatus which mixes pressurized water pressurized with compressed air with waste water and introduces it into the floating separation tank under atmospheric pressure, and removes foreign substances by adsorption and rise of bubbles. Comprising a pressure tank 100, the pressure tank 100, A closed tank portion 11 capable of storing a predetermined amount of pressurized water, One end of the upper end is opened in a funnel shape toward the top, the other side is bent to form a U-shaped tube 13 is opened downward, An ejector (21) having a nozzle (15) inserted into a predetermined position of the U-shaped tube (13), one end of which communicates with the outside of the tank (11), and the other end of which is opened upward; And the bubble removing unit 23 is formed by stacking the separation plate of the egg plate form located in the lower part of the ejector 21, Pressurized water supply pipe 31 is located in the lower portion of the bubble removing unit 23, Dissolved air flotation type water treatment apparatus comprising a water level control unit (35). In the dissolved air flotation type water treatment apparatus which mixes pressurized water pressurized with compressed air with waste water and introduces it into the floating separation tank under atmospheric pressure, and removes foreign substances by adsorption and rise of bubbles. The pressurized tank 100 receives pressurized water and mixes with the water to be treated to form a pressurized valve 200 which is ejected to the floating separation tank 300, wherein the pressurized valve 200 is A cylindrical joint pipe 47 having a discharge pipe 45 having a discharge hole 43 at a lower end thereof in communication with a pipe 41 for supplying treatment water to one side; Inserted through the same axis as the joint pipe 47 is installed, the upper end is closed by a cover 51 formed through the screw hole 49, the pressurized water supply pipe 31 is communicated to one side, the lower end is an opening The cylinder 55 of the shape The rotary shaft 61 is installed to be penetrated through the screw hole 49 of the cylinder 55 to be moved up and down, and a conical valve disk 57 is formed at the lower end, and a handle 59 is installed at the upper end. Dissolved air floating type water treatment apparatus comprising a. In the dissolved air flotation type water treatment apparatus which mixes pressurized water pressurized with compressed air with waste water and introduces it into the floating separation tank under atmospheric pressure, and removes foreign substances by adsorption and rise of bubbles. To configure the flotation separation tank 300 for treating the mixed water, the flotation separation tank 300, It is formed by laminating an egg plate-shaped separating plate 75 having an oil hole 81 and a sludge hole 83 perforated at the apex of the peak 77 and the valley 79 at the top and bottom, respectively. Dissolved air floating type water treatment apparatus, characterized in that each of the adjacent separating plate 75 comprises a separating plate assembly (73) formed integrally stacked by shifting the pitch half apart from each other.