KR100228571B1 - Wastewater treatment system - Google Patents

Abstract

The present invention relates to a wastewater treatment system for removing various suspended matters contained in wastewater, and includes an oil-containing water forming means (7,7 ', 87) for forming the oil-containing water, and a pressure tank (9) for joining the oil-containing water. , And a high pressure air flow-forming part 3 including a pressurizing pump 11 for providing a pressing force to the pressure tank 9; And floating separation tanks (51, 51 ') for floating the waste water while causing the vortex to communicate with the high pressure water conveying pipe (13) into which the high pressure bubble flow water flows from the pressure tank (9). Float discharge pipe (53) for discharging the air together with bubbles, and purified water discharge pipe (55) for discharging the purified water from which the suspended matter is removed, the floating separation tank (51, 51 ') is installed in the bubble and sludge through the purified water discharge pipe (55) Bubbles and sludge blocked by the blocking plate 57 to block the discharge and sludge deposited on the bottom of the flotation separation tank are discharged from the flotation separation tanks 51 and 51 'to discharge the pressure tank 9 or the high pressure water transfer pipe ( 13) consists of a configuration including a float floating separator (5) including a circulation pipe 59 for recycling to; Here, the inclusion flow-water forming means (7,7'87) is a line (61 ", 61" for supplying wastewater to the high pressure water transfer pipe 13, or to the high pressure water transfer pipe 13 and the pressure tank (9)) ) Is provided with a wastewater treatment system in which the wastewater to be treated is supplied to at least one of the flotation separation tanks 51 and 51 'or the pressure tank 9, thereby improving the treatment speed and treatment rate of the wastewater by the flotation separation. Can be.

Description

Wastewater treatment system

[Technical Field]

The present invention relates to a wastewater treatment system for removing various floats undesirably contained in wastewater, and more particularly, contaminated freshwater or seawater such as household sewage, industrial wastewater, aquaculture and fish farm discharged water, aquatic farm discharged water or aquarium discharged water. To a wastewater treatment system for removing various suspended matters such as floating solids, suspended solids or oily matters by flotation from seawater contaminated with water, oil and oil. will be.

Background Technology

As the industry has advanced, the severity of environmental pollution has threatened human survival, especially groundwater, rivers and seas caused by domestic sewage, factory wastewater, fish farm wastewater, livestock wastewater and ship oil spills. Pollution is also getting worse day by day.

If the polluted water is not purified without being discharged or left without removing the spilled oil, various organic matters, microorganisms, and toxic compounds may cause eutrophication, resulting in the destruction of the aquatic ecosystem as well as serious damage to humans directly and indirectly. Coated.

In order to minimize such water pollution, it is desirable to basically reduce the emission of pollutants as much as possible, but in the modern industrial society, the generation of various pollutants that may adversely affect the water quality is inevitable. Proper wastewater treatment measures, such as immediate removal or nonhazardous treatment, are indispensable.

Typical wastewater treatment methods combine a series of physical treatments (unit operations) with chemical or biological treatments (unit processes) to remove contaminants from the wastewater in three steps.

In primary treatment, screening is used to filter out relatively large contaminants in the wastewater into screens with holes of uniform size, and sedimentation to separate contaminants heavier than water by gravity. It is common to first apply the flotation and sediment contaminants contained in the waste water by applying the unit operation of. This primary treatment is also commonly referred to as pretreatment.

In the secondary treatment, various chemicals such as flocculants, adsorbents, and fungicides are used to agglomerate and sediment or adsorb suspended solids, and to kill pathogens, and to decompose non-precipitable biodegradable organic substances by the action of microorganisms. Biological unit processes, such as conversion to or flocculation with suspended solids, are used to remove organic matter contained in wastewater.

The tertiary treatment (or advanced treatment) is a combination of many of the unit operations and unit processes mentioned earlier in the primary and secondary treatments, and ammonia, nitrogen and phosphorus are not easily removed in the primary and secondary treatments. Remove various inorganic materials including heavy metals and synthetic organics

The typical wastewater treatment methods described above are only arbitrary. The wastewater to be treated and the types of contaminants contained in the wastewater, the degree of contamination of the wastewater, the amount of wastewater to be treated, the method of disposing of the treated wastewater (discharge or reuse), and the target Depending on the removal rate of pollutants, the characteristics of the wastewater treatment plant, and the like, the above-described various unit operations and unit processes may be appropriately combined to obtain a desired wastewater treatment effect.

The wastewater treatment process includes a process for removing various suspended matter such as organic matter.

Separation and removal of these suspended solids can be selectively applied to screen separation, sedimentation separation, flotation separation or filtration separation depending on the physicochemical properties (eg, size, density, surface charge, etc.) of the suspended solids. In the treatment method, sedimentation separation is predominantly used for removing suspended solids.

For example, in the case of the pretreatment process, the floats of relatively large size are removed by screen separation by racks or nets, and the suspended solids having a specific gravity larger than water are removed by sedimentation.

Since fine suspensions or particles having similar densities to water have a slow settling speed and are not suitable for screening shielding, sedimentation by chemical precipitation that involves flocculation and settling removal after changing the physical state of the suspended solids. Separation is used as a complement to the ionization process.

In addition, in chemical treatment, sedimentation and separation of chemical flocs are typically used in chemical flocculation as a method for removing suspended solids, and sedimentation and separation by chemical precipitation to facilitate removal of the floc formed as a result of biological treatment. It is used.

Of course, chemical precipitation is mainly used for the precipitation of suspended solids in the advanced treatment.

Sedimentation of suspended solids by chemical precipitation, which is widely used in wastewater treatment, is carried out by inorganic systems such as aluminum sulfate (alum), polyaluminum chloride (pac), iron sulfate (II, III) and iron chloride (II). A chemical unit process in which organic flocculants such as flocculents, polyacrylates, and acrylamide-based polymers are introduced into wastewater, whereby fine suspended solids suspended in the wastewater are flocculated into large flocks or aggregates to settle. It is advantageous in that it can settle down to about 80-90% of the suspended solids with a simple addition of.

However, sedimentation and separation of suspended solids using flocculant requires appropriate data of flocculant and dosage according to the type and amount of suspended solids in the wastewater. Otherwise, there is a problem that satisfactory removal of suspended solids may not be achieved or more flocculants may be used than necessary.

In addition, flocculants used for sedimentation of suspended solids cause problems in that flocculant remains in treated purified water and sedimented sludge, even though it does not contain components that severely affect water quality.

In addition, chemical sedimentation requires considerable chemical costs, requires additional equipment such as a device for storing and injecting a flocculant and a device for controlling the amount and rate of injection of the flocculant, and it is not easy to remove sludge from the sedimentation tank. Rather, it involves various cost burden factors such as difficulty in handling and disposal of sludge.

On the other hand, in the wastewater treatment process, a physical unit operation for removing floating matter contained in the wastewater by flotation is applied.

Flotation separation separates suspended matter or liquid particles (e.g. oil) from wastewater by introducing fine bubbles (air) into the wastewater, allowing bubbles to adhere to the suspended matter, thereby forming a float-bubble complex that increases its buoyancy. Floating floating from the waste water is removed by skimming.

Traditional flotation separation method uses air flotation, which uses a rotary impeller or diffuser to directly blow air into the wastewater to generate air bubbles. Due to limitations that cannot be achieved effectively, they are generally not effective in removing suspended solids from waste water.

Another method of flotation is pressurized flotation, which uses a pressurization device, such as an air compressor, in the pressure tank to dissolve high pressure air in the wastewater and then send the pressurized wastewater to the flotation tank to It is operated by the principle of generating fine bubbles by lowering and floating the float by the bubbles thus generated.

However, the conventional pressurized flotation separator requires a skimmer to remove the floating flotation from the flotation separation tank and a sludge collector to discharge the settled sludge. There is a problem in that the overall wastewater treatment speed is low because of the low and slow floating speed.

In addition, in some cases, in order to improve the flotation rate and increase the separation speed, it is necessary to use a chemical agent (eg, aluminum salt, iron salt, activated silica, etc.) that binds the suspended matter to each other and easily absorbs air bubbles. There is a drawback of having to perform chemical sedimentation.

Accordingly, an object of the present invention is to solve the problems of the conventional flotation apparatus, and the removal rate of the suspended solids is high enough to cope with the sedimentation separator applied with chemical deposition, and the removal speed of the suspended solids is fast, and the structure thereof. Aims to provide a simple wastewater treatment system.

Another object of the present invention is to provide a wastewater treatment system which can remove by floating separation up to approximately 90% or more of suspended solids, suspended solids and oil contained in wastewater without using flocculant.

Another object of the present invention is to introduce a bubble to the waste water conveyed by the pressure pump in accordance with the principle of Bernoulli theorem to pressurize in the pressure tank, by separating the flotation water from the pressure tank by eccentric inflow into the floating separation tank By providing vortices in the wastewater of the tank to improve the physical flocculation and flotation of the suspended matter, and to provide the wastewater treatment system that can remove the floating flotation from the flotation separation tank without the use of a separate skimmer. will be.

Still another object of the present invention is to allow the air containing the water from the pressure tank to be eccentrically introduced into the floating separation tank, thereby allowing the air containing the water containing a mixture of relatively large bubbles and small bubbles to flow therethrough. It is to provide a waste water treatment system that improves the speed of injury.

Another object of the present invention is applicable to the removal of suspended solids from contaminated fresh or seawater, such as industrial sewage, paper wastewater or dyed wastewater, aquaculture and fish farm drainage, aquarium discharge, livestock wastewater, etc. It is an object of the present invention to provide a wastewater treatment system that can be widely applied to various water treatments requiring removal.

Still another object of the present invention is to provide a wastewater treatment system capable of increasing the amount of dissolved oxygen by supplying oxygen to aquaculture water that requires a certain amount of dissolved oxygen, such as aquaculture farms.

1 is a schematic view showing a first embodiment of the wastewater treatment system according to the present invention.

Figure 2 is a schematic diagram showing the principle of operation of the inclusion flow forming means.

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a schematic diagram showing the principle of operation of the other air flow forming means.

5 is a schematic view showing a second embodiment of the wastewater treatment system according to the present invention.

6 is a schematic view showing a first air flow-forming means of the second embodiment.

7 is a schematic view showing a third embodiment of the wastewater treatment system according to the present invention.

8 is a schematic cross-sectional view showing a fourth embodiment of the present invention for installing a plurality of pressure tanks in one floating separation tank.

9 is a schematic diagram showing an example of a wastewater treatment system in which a plurality of wastewater treatment systems according to the present invention are connected in series.

* Explanation of symbols for the main parts of the drawings

1: Wastewater treatment system 3: High pressure air flow forming unit

5: floating float separation unit 7,7'87,71: containing water flow forming means

9 pressure tank 11 pressure pump

13: high pressure water transfer pipe 15: venturi pipe

17,75: supply pipe 21: inlet pipe

23: outlet pipe 27: through hole plate

29: pressure gauge 31,31 ', 69: drain valve

51,51 ': Floating separation tank 53: Float discharge pipe

55: purified water discharge pipe 57: blocking plate

59,59 ', 59 ", 59"': Circulation pipe 61,61 ', 61 ", 61"': Wastewater supply pipe and basin pipe

63: filter 73: branch pipe

83 filter 85 high pressure air nozzle

An object of the present invention described above, based on Bernoulli's theorem, the air is sucked into the water to form the inclusion water, and the formed inclusion water is pressurized to high pressure in the pressure tank by a pressure pump, and the pressurized high pressure inclusion water By sending the to the low pressure floating separation tank to vortex the waste water, floating floating matters such as floating float, floating float or oil contained in the waste water are removed by floating separation. This is achieved by a wastewater treatment system configured to include large bubbles, large bubbles and small micro bubbles.

More specifically, an object of the present invention, the air-containing water forming means for sucking air into the waste water to be treated to form air containing water, a pressure tank for pressurizing the air containing water formed by the air containing water forming means at high pressure, and A high pressure air flow-forming part including a pressurizing pump configured to provide a pressurizing pressure to the pressure tank; And an eccentric communication of the high pressure water transfer pipe into which the high pressure bubble flow water flows from the pressure tank, thereby causing floating in the waste water while causing vortex by the high pressure bubble flow water discharged from the high pressure water transfer pipe. Floating separation tank for discharging, floating discharge pipe for discharging the floating float together with the bubble, and purified water discharge pipe for discharging the final purified water from which the float is removed, installed in the upper portion of the purified water discharge pipe in the floating separation tank, bubbles and sludge is the purified water discharge pipe It consists of a configuration comprising a floating plate including a blocking plate for blocking the discharge through, the bubble and sludge blocked by the blocking plate and the circulation pipe for recycling to the floating separation tank or the high-pressure water transfer pipe: Here, the air-containing flow forming means includes the pressure tank and the unit A high pressure water transfer pipe connecting a phase separation tank or a line for supplying waste water to the high pressure water transfer pipe and the pressure tank, and the waste water to be treated is supplied to at least one of the floating separation tank and the pressure tank. It is achieved by a wastewater treatment system.

As used herein, "wastewater" refers to contaminated water containing various suspended matters, such as domestic sewage, factory wastewater, fish farm discharged water, and seawater spilled with oil, and flows into the system of the present invention to be primarily used. It means all the water up to the final discharge from the system, including the flotation treated water.

"Float" is then used generically to refer to all contaminants that can be separated by flotation, such as flotation, suspended solids and oil.

In the present invention, the inclusion-containing water forming means constituting a part of the high-pressure-containing oil-water forming portion may be installed only in the high-pressure water transfer pipe connecting the pressure tank and the floating separation tank, and the wastewater in the pressure tank as well as the high-pressure water transfer pipe. In some cases, it may be necessary to install them in the supply line (a wastewater supply pipe or a branch pipe of the wastewater supply pipe).

That is, as described in more detail later, in the case of a system configured to circulate a part of the wastewater in which the floating matter is first separated through the flotation separation tank is circulated back to the pressure tank by the circulation pipe (see the first embodiment). Although it is sufficient to install the preliminary effluent forming means only in the water conveying pipe, in the case of a system configured such that a part of the waste water passing through the floating separation tank is circulated by the circulation pipe to the high pressure water conveying pipe (see the second and third embodiment examples). In addition to the means for forming the containment water in the high pressure water pipe, another means for forming the oil in the line to supply the wastewater to the pressure tanks are to be provided.

The reason for this is to include both large bubbles and small micro bubbles in the bubble-inflowing water supplied to the flotation tank, which will become more apparent when explaining examples. will be.

The inclusion-containing oil-water forming means installed in the high-pressure water conveying pipe hereinafter is referred to as the first-containing oil-water forming means, and the formation-containing oil-water is installed in the line (waste water supply pipe or branch pipe of the waste water supply pipe) for supplying waste water to the pressure tank. The means is referred to as the second bubbling water forming means, and the other optional (optionally) additional bubbling water forming means is referred to as the third bubbling water forming means.

In the system of the present invention, a pressurized pump that provides the pressurized oil pressure in the pressure tank and improves the pumping force to the wastewater flowing through the high-pressure water feed pipe is installed in a pipe that introduces the wastewater into the pressure tank. In the case of a system having essentially only the first gas-containing oil forming means, the pressurized pump is installed in the circulation pipe, and the latter system (the system having essentially the first and the second gas-containing gas forming means) is a waste water supply pipe or It is installed in the branch pipe of the waste water supply pipe.

At this time, in the latter system, the second air flow forming means is installed between the pressure tank and the pressure pump.

The wastewater to be treated by the system of the present invention is supplied into the system by flowing into the flotation tank or the pressure tank through the wastewater supply pipe (or its pipe).

That is, in the former system, the wastewater is introduced into the system by being supplied to the flotation tank through the wastewater supply pipe (Example 1), and in the latter system, the wastewater is divided into the pressure tank and the flotation tank through the wastewater supply pipe. Supply (second embodiment) or entirely to the pressure tank (third embodiment).

The floating separation tank used in the floating floating separation unit can be used a cylindrical tank (first embodiment), a vertical tank (second embodiment) and the like having a top and bottom conical shape.

[Preferred Embodiment]

Hereinafter, a wastewater treatment system according to the present invention will be described in detail with reference to the accompanying drawings.

The following embodiments are merely illustrative of the wastewater treatment system according to the present invention, but are not intended to limit the scope of the present invention.

[Example 1]

First, a first embodiment of the wastewater treatment system according to the present invention will be described with reference to FIGS.

1 is a schematic view showing a first embodiment of the wastewater treatment system according to the present invention, FIG. 2 is a schematic view showing the principle of operation of the containing water flow forming means, FIG. 3 is a sectional view taken along the line AA of FIG. Schematic diagram showing the principle of operation of the inclusion stream forming means.

As shown in FIG. 1, the wastewater treatment system 1 according to the present invention comprises a configuration including a high pressure air-containing flow-forming part 3 and a float floating separator 5.

The high-pressure bubbling water forming portion 3 is formed by the first bubbling water forming means 7 and the bubbling water forming means 7 which suck air into the wastewater to be separated and treated to form a containing water. It includes a pressure tank (9) for pressurizing the flowing water to a high pressure, and a pressure pump (11) for providing a pressing force to the pressure tank.

First, the first air-containing water forming means 7 may use a conventional air inlet means such as an air compressor, but in the present invention, as shown in FIG. 2, a venturi tube using Bernoulli theorem is preferably used. 15 is formed, and the air supply pipe 17 is attached to this venturi pipe 15.

Therefore, the outside air is introduced into the wastewater through the air supply pipe 17 by the negative pressure generated by the action of the wastewater flowing through the high pressure water transfer pipe 13.

The air supply pipe 17 may be provided with a valve 19 to adjust the amount of air introduced therein.

The air suction action of the first gas-containing flow forming means 7 is based on the well-known Bernoulli's theorem, and the description of the specific theoretical content is omitted.

The wastewater containing the bubbles by the first bubble-containing water forming means 7 is, in this embodiment, a pressure tank (via the floating separation tank 51 and the circulation pipe 59 of the floating flotation separator 5). 9) is transferred to.

The pressure tank 9 has a cylindrical shape, is provided with an inlet tube 21 through which bubble-containing water flows and is connected to a (integrated) circulation tube 59 "which will be described later, and pressurized by the pressure tank 9 The outlet pipe 23 for sending the included containing water to the flotation separation tank 51 is installed at the bottom and is connected to the high pressure water transfer pipe 13.

Preferably, the high pressure water transfer pipe 13 is provided with a valve 25 so as to adjust the amount of air containing water flowing into the float floating separator (5).

The inner end 21 ′ of the pressure tank 9 of the inlet pipe 21 is located at the top of the pressure tank 9, and the inner end 23 ′ of the pressure tank 9 of the outlet pipe 23 is the pressure tank 9. Is located at the bottom of the, the bubble flow flowing into the pressure tank (9) is sufficiently pressurized by the pressing pressure of the pressure pump 11, the bubble-containing flow is transferred to the floating door tank (51) through the high-pressure water transfer pipe (13) It is supposed to be.

In addition, in the pressure tank 9, as indicated by a dotted line in FIG. 1, a plurality of through-plates 27 are provided horizontally to promote the miniaturization of bubbles contained in the waste water.

In addition, the pressure tank 9 is provided with a pressure gauge 29 for measuring the pressure inside the tank, and drain valves 31 and 31 'are mounted on the upper and lower portions, respectively.

In this embodiment, the pressure pump 11 is installed at one point of the (integrated) circulation pipe 59 "'described later, and provides a pressing force to the wastewater containing bubbles flowing into the pressure tank 9.

According to the configuration of the high-pressure bubble-containing water forming unit 3 described above, the wastewater contained in the bubble stream while passing through the bubble-containing oil forming unit 7 is partially part of the waste water via the flotation separation tank 51. Inflow to the pressure tank (9) through the circulation pipe (59), where the water containing air is pressurized to a high pressure above atmospheric pressure depending on the pressure of the pressure pump (11).

In general, when the water is pressurized, the amount of air that can be contained in the water is limited to the amount of air that can be dissolved in the water. Not only is the amount of air dissolved dissolved, but also the volume of bubbles contained can be reduced to contain a significant amount of bubbles.

The high pressure bubble flowing water pressurized by the high pressure bubble flowing water forming unit 3 flows into the float floating separator 5 through the high pressure water conveying pipe 13.

The float floating separator 5 includes a float separation tank 51, a float discharge pipe 53, and a purified water discharge pipe 55, a blocking plate 57, a circulation pipe 59, and a wastewater supply pipe 61. Consists of

The floating separation tank 51 in this embodiment is a cylindrical tank (see FIG. 1) having a top and bottom conical shape.

This cylindrical tank 51 is suitable for treating a small amount of waste water, such as the discharge water of an aquarium.

Floating material discharge pipe 53 for discharging the floating matter floated by the bubble to the outside of the tank 51 at the top of the cone of the floating separation tank 51 is installed.

In addition, the purified water removed in the float is discharged to the outside of the system 1 at the lower side of the floating separation tank 51, for example, as shown in FIG. 1, where the lower cone shape of the tank 51 starts. The purified water discharge pipe 55 provided with the valve 56 is provided so that the purified water from which the suspended matter is removed is sent to a water source or the following treatment process.

In addition, a wastewater supply pipe 61 is installed at a lower portion (a point where the upper cone ends) of the floating discharge pipe 53 of the floating separation tank 51, so that the wastewater to be treated is first introduced into the system 1 of the present invention. do.

Upstream of this wastewater supply pipe 61, a filter 63 is provided to filter out foreign matter large enough to be removed by floating separation (e.g. wood chips, small boulder, etc.) so that the pipes of the system are blocked by these foreign matters. It is preferable to prevent, and the wastewater supply pipe 61 may be provided with a valve 65 for adjusting the amount of wastewater introduced.

The high pressure water transfer pipe 13 described above is eccentrically communicated with the floating separation tank 51, as shown in FIG.

As a result, when the high-pressure containing water flows into the flotation separation tank 51, the wastewater in the flotation separation tank 51 is vortexed about the vertical center line of the tank 51 by the hydraulic pressure discharged from the high pressure water transfer pipe 13. (Twirl) In this manner, the floating matter contained in the wastewater contained in the floating separation tank 51 is collected by the vortex to the center of the floating separation tank 51 to further promote the floating separation action of the floating matter.

Preferably, the high pressure water transfer pipe 13 is in communication with the floating separation tank 51 at a height approximately 2/3 of the total height of the floating separation tank 51.

The high pressure air containing water flowing into the floating separation tank 51 through the high pressure water transfer pipe 13 is exposed to the relatively low pressure floating separation tank 51 and at the same time, the dissolved air is not only released into the air bubbles. As the pressurized bubble expands and bursts, fine bubbles are generated throughout the wastewater in the flotation tank 51.

The microbubbles generated in this way are attached to the suspended matter in the wastewater in the floating separation tank 51 to form one suspended matter-bubble complex. Float-bubble complex has a specific gravity less than the specific gravity of the water to increase the buoyancy, eventually the float rises and is pushed out of the flotation separation tank 51 through the float discharge pipe 53 with the foam. This removes the float from the wastewater. At this time, since the wastewater of the flotation separation tank 51 generates a tornado according to the structural characteristics (eccentric inflow structure) of the high pressure water transfer pipe 13 described above, the float is concentrated in the center of the flotation separation tank 51. By promoting bubble complex formation, the effect of injury is further enhanced.

Since the wastewater in the floating separation tank 51 is causing the whirlwind, some sludge and the microbubbles that are not suspended by the microbubbles are led to the lower part of the tank 51 along the bottom of the whirlwind extending to the bottom of the tank 51. And, such micro bubbles and sludge may be discharged through the purified water discharge pipe (55).

Therefore, in the system 1 of the present invention, fine bubbles and sludge not suspended in the floating separation tank 51 directly above the purified water discharge pipe 55 are prevented from being discharged out of the system through the purified water discharge pipe 55 together with purified water. A blocking plate 57 is provided.

Since the bottom of the whirlwind is driven to the lower center of the floating separation tank 51, the first circulation pipe 59 ′ guides the microbubbles and sludge concentrated therein by the whirlwind out of the floating separation tank 51 at the center of the blocking plate 57. Is installed, and the second circulation pipe (59 ") guides the sludge settled at the bottom of the tank (51) out of the flotation separation tank (51) without being swept into the lower conical lower end of the flotation separation tank (51). Is installed, the biceps circulation pipe 59 ', 59 "is integrated into one to form an integrated circulation pipe 59"' returning to the inlet pipe 21 of the pressure tank 9. And the integrated circulation pipe One point of 59 " 'is provided with a pressure pump 11 as mentioned above. The first and second circulation pipes 59'59 " are preferably adjusted such that the ratio of wastewater flowing therethrough is approximately 9: 1, and the first and second circulation pipes 59 ', 59 ") may be provided with valves 67'67 ", respectively. At the lowermost portion of the second circulation pipe 59 ", the high-density sludge not discharged by the system 1 is discharged out of the system. It is preferable to provide the drain valve 69.

In this embodiment, the circulation pipe 59 acts to increase the likelihood that the non-floating sludge is circulated again by circulating the system 1, and also includes the flowing water supplied to the flotation separation tank 51. The relatively large bubbles and the small micro-bubble to act to include at the same time.

The latter action is very important for enhancing the flotation effect of the present invention. This will be described below.

The first bubble introduced into the wastewater through the air supply pipe 17 of the first bubble-containing water forming means 7 installed in the high pressure water transfer pipe 13 did not pass through the pressure tank 9 and the floating separation tank 51. Because the bubble is not vortexed at), the particle size is relatively large.

On the other hand, after being introduced into the wastewater through the air supply pipe 17 of the first gas-containing water forming means 7 and undergoing the vortex action while passing through the floating separation tank 51, the pressure tank again through the circulation pipe 59 ( Bubbles recycled and pressurized to 9) have a relatively small particle size.

Therefore, the wastewater discharged from the high pressure water transfer pipe 13 to the floating separation tank 51 includes both a small fine bubble recycled and a large bubble not recycled.

In general, microbubbles easily form a float-bubble complex but are insufficient to increase the buoyancy of the float. Therefore, it is difficult to obtain the floating effect of sufficient floating matter with only microbubbles. On the other hand, large bubbles are basically difficult to form a float-bubble complex, so when there are only large bubbles, the bubbles do not help to float the float.

The excellent floating effect of the system (1) of the present invention appears to be due to the floating of the suspended solids by the inclusion water containing both microbubbles and large bubbles. Large bubbles are presumed to be due to the interaction of microbubbles with large bubbles, acting on the thus formed float-bubble complex and increasing its buoyancy.

As shown in FIG. 1, in this embodiment, at one point of the integrated circulation pipe 59 ′ ′, a third air flow forming means 71 is additionally provided downstream of the pressure pump 11. By installing it, it is possible to increase the amount of microbubbles introduced into the pressure tank (9).

As the third bubble-containing water forming means 71, as shown in FIG. 4, branched downstream of the integrated circulation pipe 59 "'and returned to the upstream of the integrated circulation pipe 59"'. A structure including the branch pipe 73 piped and the air supply pipe 75 formed at one point of the branch pipe 73 (for example, the central position of the branch pipe full length) may be used, and the branch pipe 73 may be used. The diameter of R is relatively small compared to the diameter of the integrated circulation tube 59 "'.

The third inclusion flowing water forming means 71 also follows Bernoulli's theorem.

That is, when the wastewater is pumped through the integrated circulation pipe 59 "'by the operation of the pressurizing pump 11, the wastewater having a predetermined flow rate generates negative pressure at the front end 73" of the branch pipe 73. The negative pressure generated in the branch pipe 73 is delivered to the rear end 73 "of the branch pipe 73, and part of the water flowing through the rear point 77" to which the branch pipe 73 and the integrated circulation pipe 59 "'are connected. Is sucked into the rear end 73 "of the branch pipe 73 from the integrated circulation pipe 59" '.

Therefore, a part of the water pumped by the pressure pump 11 flows back to the branch pipe 73 in the counterclockwise direction, and air is sucked into the air supply pipe 75 formed in the branch pipe 73 in the process. This air enters the wastewater flowing through the mixing circulation pipe 59 "'and forms bubbles.

In the branch pipe (3), at least one valve (79 ", 79") is installed at the center of the air supply pipe (75) so that the waste water H flowing through the branch pipe (73) can adjust the amount of contained water. In addition, in the initial stage of operation of the pressure pump 11, the wastewater can smoothly flow to the branch pipe 73 in the counterclockwise direction.

In addition, a check valve can be used as the valve 81 of the air supply pipe 75 in order to prevent backflow through the air supply pipe 75.

Naturally, the structure of the venturi tube 15 as shown in FIG. 2 may be used as the third bubble-containing water forming means 71 as it is.

The flotation separation tank 51 is bypassed to the lower part of the tank 51 by vortex to be discharged to the purified water outlet 55 without being floated and separated, or to minimize the amount of sludge recycled through the circulation pipe 59 unnecessarily. The pass pipe 83 can be provided.

Bypass pipe 83, as shown in FIG. 1, a pipe connecting the lower center of the floating separation tank 51 where the vortex is concentrated in the floating separation tank 51 and a point just above the water surface of the floating separation tank. The high pressure air nozzle 85 is installed in the pipe at the point of returning to the floating separation tank 51, and sprays the wastewater returning to the floating separation tank 51 through the bypass pipe 83 as a fog. In such a configuration, the mist particles including the sludge are discharged together with the floats floated through the float discharge port 53 in the foam formed on the water surface. Therefore, there is an effect that can remove the sludge is not suspended by flotation.

Reference numeral 84 denotes a valve for adjusting the bypass amount.

Second Embodiment

Next, with reference to FIG. 5 and FIG. 6, the 2nd specific example of the wastewater treatment system which concerns on this invention is demonstrated.

In the second embodiment, the vertical tank 51 'is used as the floating separation tank, and the first air-flow forming means 7 includes an integrated circulation pipe 59 "' installed in the high-pressure water feed pipe 13; And the wastewater to be treated by the system of the present invention flows into the flotation separation tank 51 'through the wastewater supply pipe 61' while the wastewater is partially discharged. Is introduced into the pressure tank (9) through the branch pipe (61 ") of the supply pipe (61 '), the pressure pump 11 is installed in the branch pipe (61") of the waste water supply pipe connected to the pressure tank (9) In addition to the first air flow forming means 7 'installed at the point and the high pressure water feed pipe 13, a second air flow forming means 87 is essentially required in the branch pipe 61 ". It differs from the said 1st specific example in that it is, and the remainder is the same as that of a 1st specific example.

That is, the present embodiment is preferably applied to the case of treating a larger amount of wastewater compared to the first embodiment and to the case where the specific gravity of the suspended solids contained in the wastewater is high and the concentration is high.

Specifically, as shown in FIG. 5, a wastewater supply pipe 61 'is installed at an upper side of the floating separation tank 51', and the wastewater is branched from a wastewater supply pipe 61 '. Is connected to the pressure tank (9).

Most of the wastewater flows directly into the flotation separation tank 51 'through the wastewater supply pipe 61' and undergoes the flotation separation process, but a part of the wastewater introduced into the wastewater supply pipe 61 'is passed through the branch pipe 61 ". It is supplied to the pressure tank 9 via the pressure pump 11.

Between the pressure tank 9 and the pressurizing pump 11, a second air-containing flow-forming means 87 having a structure substantially the same as the air-containing flow-forming means 7 'is essentially provided, so that the branch pipe 61 Air into the wastewater passing through

The high-pressure bubble-containing water pressurized in the pressure tank 9 by the pressure of the pressure pump 11 passes through the high-pressure water transfer pipe 13 in a state containing fine bubbles.

At this time, the air flows into the wastewater while passing through the first air-flow forming means 7 'and the floating separation tank through the integrated circulation pipe 59 "' of the floating separation tank 51" connected thereto. 51 ') and mixed with wastewater.

6 is a schematic view showing the first air flow generating means of the present embodiment.

As shown, the air-containing water forming means 7 ′ has a structure in which air is introduced into the waste water in substantially the same configuration and principle as the first air-containing water forming means 7 of the first embodiment. In this case, the venturi pipe 15 'is configured to suck both the external air and the wastewater of the integrated circulation pipe 59 "' by the action of the high pressure bubble flowing water flowing through the high pressure water transfer pipe 13. .

The wastewater that has passed through the first bubble-containing water forming means 7 'is introduced into the wastewater by the second bubble-containing water forming means 87 and passed through the pressure tank 9 to form a fine bubble and floating separation tank 51'. ), Including the microbubble returned through the circulation pipe 59 and the large bubble formed by the air first introduced from the outside air by the first bubble-containing flow forming means 7 '.

That is, the second bubble-containing water forming means 87 and the circulation pipe 59 contribute to providing microbubbles to the wastewater supplied to the floating separation tank 51 ', and the first bubble-containing water forming means 7'. Contributes to providing large bubbles.

Therefore, when the high-pressure bubble-containing water is ejected into the flotation separation tank 51 ', the floating water intermediate float is effectively floated by the interaction of the microbubbles and the large bubbles in the same manner as described in the first embodiment.

The wastewater supply pipe 61 'after the wastewater supply pipe 61', the branch pipe 61 ", and the branch pipe 61" is provided with the flow control valves 65 ', 65 ", 65"', respectively. It is preferable to be able to adjust the absolute amount and the relative amount of the wastewater flowing into the 61 " and the wastewater supply pipe 61 '.

For matters other than those described above, the content of the first embodiment may be applied or applied as it is.

[Third embodiment]

7 is a schematic view showing a third embodiment of the wastewater treatment system according to the present invention.

As shown in the present embodiment, the pressurizing pump 11 is installed in the wastewater supply pipe 61 "'to supply all the wastewater only to the pressure tank 9, and the tank as in the first embodiment as a floating separation tank ( 51) is substantially the same as the second embodiment except for the difference.

In this case, there is no need to install a wastewater supply pipe for supplying wastewater to the flotation separation tank 51, and the entire wastewater to be treated is wastewater supply pipe 61 ′ ′, a pressure pump 11, and a second air-containing water forming means 87. ), The pressure tank 9, and the high-pressure water transfer pipe 13 is ejected to the floating separation tank 51 while the floating separation is made.

This embodiment is a system that can be applied when the viscosity of the suspended matter contained in the waste water is high.

The system of the various embodiments according to the present invention described above, the characteristics of the wastewater to be subjected to the flotation separation treatment, for example, the type of wastewater to be treated and the type of suspended solids contained in the wastewater, the degree of contamination (float concentration) of the wastewater, treatment The pressure of the pressure pump 11, the shape and capacity of the floating separation tank, the high-pressure water feed pipe 13, depending on the amount of wastewater to be treated, the final disposal method of the treated wastewater (discharge or reuse), the removal rate of the target float, and the like. Opening and closing amount of the valve 25 installed in the valve, the absolute amount and relative amount of the primary floating separated wastewater passing through the first circulation pipe 59 'and the second circulation pipe 59 ", and the wastewater supply pipe 61 and the like. By appropriately adjusting the amount of wastewater supplied in the discharge pipe 55, the suspended matters contained in the wastewater can be properly removed.

For example, if the specific gravity of the suspended matter contained in the wastewater is similar to or greater than the specific gravity of the wastewater, the output of the pressure pump 11 is increased, and more air is introduced into the wastewater, thereby allowing the air to flow into the wastewater separation tank (51). It can be manipulated to generate a large amount of bubbles, and if the float is easy because the specific gravity of the float is small, it can be manipulated to generate a relatively small amount of bubbles in the floating separation tank.

[Example 4]

8 is a schematic cross-sectional view showing a fourth embodiment of the present invention in which a plurality of pressure tanks are installed in one floating separation tank.

This embodiment may be applied when it is necessary to further increase the speed of flotation of suspended matter contained in the wastewater or increase the wastewater treatment capacity.

8 shows an example in which three pressure tanks are installed in one floating separation tank.

That is, three pressure tanks 9 are installed with respect to the floating separation tank 51 in the center, and the high pressure water transfer pipes 13 from each pressure tank 9 are equally spaced from the floating separation tank 51. It is the structure made to communicate eccentrically in the same direction and the same angle.

When the system of the first to third embodiments is applied to the system of the present embodiment, the integrated circulation pipe 59 " 'is divided into three and connected to each pressure tank 9 or the high pressure water transfer pipe 13. Naturally, when the first embodiment is applied, one pressurized pump 11 may be installed in the integrated circulation pipe 59 "'before being divided, and each integrated circulation divided as shown in FIG. One tube may be installed.

8 applies the system of the first embodiment to this embodiment.

[Example 5]

9 is a schematic diagram showing an example of a wastewater treatment system in which a plurality of wastewater treatment systems according to the present invention are connected in series.

The system of FIG. 9 is a system in which the system of the first embodiment and the system of the second embodiment are connected in series, and the wastewater discharge pipe 55 of the first flotation system 1 is connected to the wastewater of the second flotation system 1 '. It is comprised so that it may be connected to the supply pipe 61 '.

Therefore, the small floating matters that are easy to float in the first flotation separation system 1 are first removed, and the wastewater is flowed back into the second columnar separation system 1 'so that the larger floating weights are separated again. The removal rate of the suspended solids can be further increased.

At this time, the pressure of the pressure tank 9 of the second flotation separation system 1 'located downstream is set higher than the pressure applied to the pressure tank 9 of the first flotation separation system 1 located upstream. desirable.

In other words, in series connection of a plurality of floating separation systems, it is better to set the application pressure to increase gradually toward the downstream.

Accordingly, in the upstream flotation separation system, the floats which are easy to separate the flotation are removed, and the floats which are more similar to the wastewater or have a greater specific gravity than the wastewater are removed toward the downstream flotation system.

In addition, the floating separation tank 51 'of the second floating separation system 1' must be disposed lower than that of the floating separation tank 51 of the first floating separation system 1, whereby the two tanks 51, 51 ') is separated from the floating separation tank 51 of the first floating separation system 1 through the wastewater supply pipe 61' of the purified water discharge pipe 55 and the second floating separation system 1 'by the water level difference of 51'). The wastewater treated first by the tank 51 'flows naturally.

The wastewater treatment system according to the present invention described above can be widely applied to the case where it is necessary to remove not only the various wastewaters mentioned above, but also the various suspended matters contained in the liquid fluid, and in particular, pretreatment of the wastewater (primary treatment) Treatment) can be effectively applied to the process.

In addition, in the case of treating the aquaculture water using the system of the present invention in the aquaculture farm, it is possible not only to effectively remove the suspended matter contained in the aquaculture water, but also to increase the amount of dissolved oxygen by supplying oxygen in the aquaculture water. Therefore, it can be applied as a system for supplying oxygen to the farm.

According to the wastewater treatment system according to the present invention, since it is possible to remove up to about 90% or more of floating matters such as floating flotation, floating floats and oil contained in the wastewater without using a chemical such as a flocculant. The chemical sedimentation sedimentation system used in the pretreatment process can be completely coped with, thus eliminating the problem of chemical residues.

Second, in accordance with Bernoulli's theorem, air is introduced into the wastewater to pressurize it into a pressure tank, and the floating separation of the float is more effectively performed by allowing clothing to form in the wastewater during the separation of the float from the flotation tank.

Third, the flotation separation effect of floating particles is greatly enhanced by supplying the floating water containing the fine particles with small particles and the large bubbles with the floating separation tag.

Fourth, it is not necessary to use a separate skimmer system because the floating flotation can be discharged from the floating separation tank as it is.

Fifth, difficult to treat sludge as in sedimentation is not substantially generated.

Sixth, the structure of the wastewater treatment system is simple, and the operation cost is low because the drug cost, the cost related to drug administration, the sludge treatment cost, the skimmer system cost, etc. are not at all useful or only a small cost is required.

Seventh, in the case of using the system of the present invention in aquaculture farms by supplying oxygen to the aquaculture water to increase the amount of dissolved oxygen can be prevented from being killed.

Finally, the system of the present invention includes various kinds of wastewater such as industrial wastewater such as domestic sewage, paper wastewater, or dyeing wastewater, various wastewater treatment such as aquaculture and fish farm effluent, aquarium effluent, livestock wastewater, and seawater contaminated with oil. It can be widely applied to water treatment.

Claims (10)

Air-containing water forming means for sucking air into the waste water to be treated to form air-containing water, a pressure tank for pressurizing the air-containing water formed by the air-containing water forming means to a high pressure, and a pressure for providing a pressing force to the pressure tank. High pressure air containing water forming unit including a pump: and the high pressure air containing the high pressure water discharge pipe from which the internal waste water is discharged from the high pressure water feed pipe eccentrically communicated with the high pressure water transfer pipe into which the high pressure air containing water flows from the pressure tank Floating separation tank which floats the floating water in the waste water while causing the vortex to float, a floating discharge pipe for discharging the floating floating material together with air bubbles, and a purified water discharge pipe for discharging the final purified water from which the floating water is removed, and the purified water discharge pipe in the floating separation tank. A car installed at the top to block air bubbles and sludge from being discharged through the purified water discharge pipe Made of a plate, a configuration including suspension floatation unit including a circulation pipe is recycled into the air bubbles and sludge, and the floatation tank or the high-pressure air line is blocked by the blocking plate; Here, the bubble-containing water forming means is installed in a high pressure water transfer pipe connecting the pressure tank and the floating separation tank, or in a line for supplying waste water to the high pressure water transfer pipe and the pressure tank, and the waste water to be treated is Waste water treatment system characterized in that supplied to at least one of the flotation separation tank or the pressure tank. According to claim 1, wherein the bubble-containing water forming means is essentially installed only in the high-pressure water transfer pipe connecting the pressure tank and the floating separation tank, the circulation pipe is returned to the pressure tank, the wastewater to be treated is Wastewater treatment system, characterized in that supplied as a floating separation tag. The wastewater treatment system according to claim 2, wherein the circulation pipe further includes bubble-containing water forming means between the pressure pump and the pressure tank. According to claim 1, wherein the containing water flow forming means is essentially installed in both the high pressure water transfer pipe and the line for supplying wastewater to the pressure tank, the circulation pipe is returned to the high pressure water transfer pipe, Waste water treatment system, characterized in that the waste water is supplied to at least the pressure tank. 5. The wastewater treatment system of claim 4, wherein the wastewater to be treated is supplied to the pressure tank and the flotation tank. The wastewater treatment system according to any one of claims 1 to 5, wherein the bubble-containing water forming means is a venturi tube. The bypass separation tank according to any one of claims 1 to 5, wherein the floating separation tank has a bypass pipe and the bypass pipe connecting the center of the point where the vortex is concentrated in the floating separation tank and the point above the water surface of the floating separation tank. Waste water treatment system further comprises a high-pressure air nozzle for spraying the wastewater returned to the point above the water surface of the flotation tank through the flotation tank. The method according to any one of claims 1 to 5. The floating separation tank is a waste water treatment system, characterized in that the cylindrical tank or vertical tank having a top and bottom conical shape. According to any one of claims 1 to 5, The float floating separator in the plurality of high-pressure air-containing water forming unit is returned to the high-pressure water transfer pipe, respectively, characterized in that each pressure tank is provided with a pressure pump. Wastewater treatment system. The purified water discharge pipe of the wastewater treatment system according to claim 2 is connected to a wastewater supply line of the wastewater treatment system according to claim 4, and the pressure applied to each pressure tank of the two systems is such that the downstream system is upstream. The wastewater treatment system characterized by being higher than this upstream system.

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