KR20210062492A - Wastewater treatment method using micro bubbles - Google Patents

Abstract

The present invention relates to a method for treating wastewater using microbubbles. The method includes: a raw water supply step in which a raw water supply unit supplies raw water to a water storage space portion with the water storage space portion of a water storage tank containing the raw water, concentrate, and treatment water; a microbubble supply step in which a mixed liquid is generated by a microbubble supply unit suctioning the treatment water of the water storage space portion and a gas and then microbubbles are generated by supply to the water storage space portion; a microbubble mixing step in which fine particles in the raw water are attached to the microbubbles by mixing between the microbubbles and the raw water; a microbubble levitation step in which the fine particle-attached microbubbles are levitated upward and separated; a concentrate separation step in which the levitated concentrate is scraped and discharged to a concentrate discharge unit by a scraping unit; and a treatment water discharge step in which the concentrate-separated treatment water is discharged to a treatment water discharge unit. According to the present invention, the efficiency of sludge separation can be improved by the supplied microbubbles being mixed with the raw water, the separated sludge can be discharged separately, and thus work efficiency can be improved.

Description

Wastewater treatment method using micro bubbles

The present invention relates to a wastewater treatment method, and more particularly, to a wastewater treatment method using microbubbles that can improve work efficiency by supplying microbubbles and raw water, but floating and separating microparticles by mixing and discharging them separately. About.

In general, wastewater treatment refers to the removal of foreign substances that are dissolved in raw water and in the form of fine particles.The foreign substances are solidified by various methods such as chemicals and microorganisms, and the solidified foreign substances are separated using a physical method. It refers to the process of separating into sludge.

As a method of such a wastewater treatment process, a pressurized flotation method is used to improve the disadvantages of the previously used sedimentation method.

The principle of this pressurized floatation is that air is dissolved in the raw water at atmospheric pressure and exists as dissolved oxygen.If the air is injected while the raw water is put in a container and the pressure is raised, the air melts more than the atmospheric pressure, and the molecules are not dissolved. It exists in the original procedure in a state.

When the pressure is lowered to atmospheric pressure in this state, the air that was present in the molecular state in the water is released back to the atmosphere.

When pressurized water is supplied to raw water using this, the fine air of the pressurized water and the condensed sludge are entangled, the sludge has buoyancy, and floats on the water, thereby removing the floated sludge.

Looking at the conventional pressurized flotation tank, as disclosed in Patent Registration 10-0797197, microbubbles are generated by spraying air into wastewater (raw water), thereby activating the separation of floating foreign substances and removing the floated sludge by a scraping device. Will be discharged.

However, when air bubbles are generated by simply spraying air, there is a problem in that it is difficult to generate fine bubbles and thus efficiency is deteriorated, which leads to a decrease in overall separation efficiency.

Accordingly, there is an urgent need to develop a technology capable of effectively separating microparticles from raw water as microbubbles are generated and supplied uniformly and effectively.

Accordingly, the present invention has been devised to solve the above problems, and the raw water supply step of supplying raw water to the storage space by the raw water supply unit in a state in which raw water, concentrate, and treated water are contained in the storage space of the storage tank. Micro-bubble supply step of generating micro-bubbles by inhaling the treated water and gas in the storage space part by a bubble supply part and supplying it to the storage-water space part, and the micro-bubbles and raw water are mixed and contained in the raw water. Micro-bubble mixing step in which fine particles are attached to micro-bubbles, micro-bubble flotation step in which the micro-bubbles attached to the fine particles are floated upward and separated, and the concentrate floated by the scraping part is scraped to the concentrate discharge part and discharged. Including the concentrated liquid separation step and the treated water discharge step of discharging the treated water from which the concentrated liquid is separated to the treated water discharge unit, the supplied microbubbles are mixed with raw water to improve the sludge separation efficiency, and the separated sludge can be discharged separately. It is an object to provide a wastewater treatment method using microbubbles that can improve work efficiency.

The present invention for achieving the above object is a raw water supply step of supplying raw water to the storage space unit by a raw water supply unit in a state in which raw water, concentrate, and treated water are contained in the storage space unit of the storage tank, the storage space unit by the microbubble supply unit A microbubble supply step of generating microbubbles by inhaling the treated water and gas of the water and supplying it to the storage space, and the microbubbles in which the microbubbles and the raw water are mixed and the microparticles contained in the raw water are attached to the microbubbles. A bubble mixing step, a microbubble floating step in which the microbubbles with the fine particles attached thereto are floated upward and separated, a concentrated liquid separation step in which the concentrated liquid floated by the scraping part is scraped to the concentrated liquid discharge part and discharged, and the concentrate is And a treated water discharging step of discharging the separated treated water to the treated water discharging unit.

Preferably, the storage space part of the raw water supply step comprises a mixing space part for mixing raw water supplied from the raw water supply part and micro bubbles supplied from the micro bubble supply part, and the raw water and micro bubbles mixed in the mixing space part. A floating space part which is moved but separated by floating microbubbles and attached microparticles, a separation space part in which the treated water from which the fine particles are separated from the floating space part is moved and stored, and a first for dividing the mixing space part and the floating space part It includes one partition wall, and a second partition wall for partitioning the floating space part and the separation space part.

And the raw water supply step, the raw water inlet step in which raw water is supplied to the mixing space part of the storage space part along the raw water supply pipe by the raw water pump of the raw water supply part, and flows in through the raw water supply pipe by the flow sensor of the raw water supply part. And a raw water amount measuring step of measuring the amount of raw water, and a raw water amount controlling step of controlling the raw water amount by controlling the raw water pump by the raw water supply control unit receiving the signal from the flow sensor.

In addition, in the step of supplying microbubbles, a plurality of first blades and a first mixing path are formed on one surface, and an impeller having a plurality of second blades and a second mixing path formed on the other surface is rotatable in the rotating space of the pump body. A treated water inflow step in which the treated water from the storage space is introduced into the microbubble pump along the treated water supply pipe by the microbubble pump of the microbubble supply unit provided, and when the impeller is rotated so that the treated water is introduced, the gas supply unit Through the gas inflow step in which gas is introduced into the rotating space part, a plurality of rotating first blades, second blades, the first mixing furnace, and the treated water and gas supplied by the second mixing furnace are blown and mixed to generate a mixed liquid. And a micro-bubble generation step of generating micro-bubbles by lowering the pressure to normal pressure as the mixed liquid produced by the impeller is supplied to the mixing space part through a mixed-liquid supply pipe.

And the mixed liquid generation step, as the impeller is rotated so that the first and second blades are rotated, a striking step of striking the treated water and gas supplied to the rotating space, and the striking treated water and gas are mixed. A first mixing step of first mixing by guiding along the furnace in the direction of the center of the impeller, and the first mixing furnace through a mixing communication hole formed to communicate the first mixing furnace and the second mixing furnace with each other. And a second mixing step of secondary mixing by moving the mixed liquid mixture to another mixing furnace.

In addition, it further includes a piping mixing unit for mixing by passing the mixed solution moving along the mixed liquid supply pipe in a spiral manner, and a third mixing step of tertiary mixing the mixed solution passing through the piping mixing unit. .

And the piping mixing unit includes a piping mixing body provided to communicate with the mixed liquid supply pipe, and a piping mixing screw for tertiary mixing by guiding the mixed liquid provided inside the piping mixing body in a spiral manner. .

In addition, the control unit receiving a signal from the micro-bubble pressure sensor provided in the mixed liquid supply pipe controls the micro-bubble pump to control the amount of micro-bubbles generated, further comprising a micro-bubble control step.

And the micro-bubble control step, a pressure signal receiving step of receiving a signal from the micro-bubble pressure sensor provided in the mixed liquid supply pipe, and the micro-bubble pump by the micro-bubble control unit receiving the signal of the micro-bubble pressure sensor. And a micro-bubble control step of controlling the amount of generated micro-bubbles by controlling the amount of the treated water in the separation space part and the gas inflow amount of the gas supply part.

In addition, the micro-bubble control unit of the micro-bubble control step further includes a second micro-bubble control step of controlling the generation amount of micro-bubbles in response to the raw water inflow amount in connection with the raw water supply control unit of the raw water amount control step.

And the concentrated liquid separation step, as the connecting member is rotated by the driving unit of the scraping unit, the scraper is rotated together to scrape the fine particles floating in the floating space part and the separation space part, the A concentrated liquid discharge step of discharging the concentrated liquid to the concentrated liquid discharge part by a scraping part, and a scraper cleaning step of discharging fine particles by a scraping washing part provided at the upper end of the concentrated liquid discharge part and washing the scraper passing through the first rotating part Includes,.

In addition, the scraping and cleaning unit has elasticity and is formed to be inclined downward from the upper end of the concentrate discharge unit toward the first rotating unit.

As described above, according to the wastewater treatment method using microbubbles according to the present invention, the separation efficiency of sludge is improved by mixing the supplied microbubbles with raw water, and the separated sludge can be discharged separately, thereby improving work efficiency. It is a very useful and effective invention that makes it possible.

1 is a view showing a wastewater treatment method using microbubbles according to the present invention,
2 is a view showing a solid-liquid separation device using microbubbles according to the present invention,
3 is a view showing a side view of the solid-liquid separation device according to the present invention,
4 is a view showing the raw water supply step according to the present invention,
5 is a view showing a microbubble supply step according to the present invention,
6 is a view showing a microbubble supply unit according to the present invention,
7 is a view showing a microbubble pump according to the present invention,
8 is a view showing a mixed solution generation step according to the present invention,
9 is a view showing another embodiment of the microbubble supply step according to the present invention,
10 is a view showing a concentrated liquid separation step according to the present invention,
11 is a view showing another embodiment of a wastewater treatment method using microbubbles according to the present invention,
12 is a view showing a state in which a treatment water tank part, a fermentation part, and a circulation part are further provided in the solid-liquid separation device according to the present invention,
13 is a diagram showing a post-processing step according to the present invention,
14 is a view showing a fermentation step according to the present invention,
15 is a diagram showing a cycle step according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The detailed description to be disclosed below together with the accompanying drawings is intended to describe exemplary embodiments of the present invention, and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those of ordinary skill in the art to which the present invention pertains knows that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or may be illustrated in a block diagram form centering on core functions of each structure and device.

Throughout the specification, when a part is said to "comprising or including" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. do. In addition, the term "... unit" described in the specification means a unit that processes at least one function or operation. In addition, "a or an", "one", "the" and similar related words are different from the present specification in the context of describing the present invention (especially in the context of the following claims). Unless indicated or clearly contradicted by context, it may be used in the sense of including both the singular and the plural.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

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

1 is a view showing a wastewater treatment method using microbubbles according to the present invention, Fig. 2 is a view showing a solid-liquid separation apparatus using microbubbles according to the present invention, and Fig. 3 is a solid-liquid separation apparatus according to the present invention Figure 4 is a view showing a side view of the raw water supply step according to the present invention, Figure 5 is a view showing the microbubble supply step according to the present invention, Figure 6 is a microbubble according to the present invention Fig. 7 is a view showing a microbubble pump according to the present invention, Fig. 8 is a view showing a mixed solution generation step according to the present invention, and Fig. 9 is a microbubble supply step according to the present invention FIG. 10 is a view showing another embodiment of the method of separating a concentrate according to the present invention, and FIG. 11 is a view showing another embodiment of a wastewater treatment method using microbubbles according to the present invention, 12 is a view showing a state in which the treatment water tank, fermentation, and circulation part are further provided in the solid-liquid separation apparatus according to the present invention, and FIG. 13 is a view showing a post-treatment step according to the present invention, and FIG. It is a view showing the fermentation step according to the invention, Figure 15 is a view showing the circulation step according to the present invention.

As shown in the drawing, the wastewater treatment method using microbubbles includes a raw water supply step (S10) and a microbubble supply step (S20), a microbubble mixing step (S30), a microbubble floating step (S40), and a concentrated liquid separation step ( S50) and the treated water discharging step (S60).

In the raw water supply step (S10), raw water is supplied to the storage space 102 by the raw water supply unit 200 in a state in which raw water, concentrate, and treated water are contained in the storage space 102 of the storage tank 100.

In addition, in the micro-bubble supply step (S20), a mixed liquid is generated by inhaling the treated water and gas of the storage space unit 102 by the micro-bubble supply unit 500, and then supplying the micro-bubbles to the storage space unit 102. Occurs.

In the micro-bubble mixing step (S30), micro-bubbles and raw water are mixed, and fine particles contained in the raw water are attached to the micro-bubbles.

In addition, in the microbubble floating step (S40), microbubbles to which microparticles are attached are floated upward and separated.

In the concentrated liquid separation step (S50), the concentrated liquid floated by the scraping part 600 is scraped to the concentrated liquid discharge part 300 and discharged.

In addition, the treated water discharging step (S60) discharges the treated water from which the concentrated liquid has been separated to the treated water discharging unit 400.

To this end, the solid-liquid separation device 10 using fine bubbles, as shown in Figure 2, the storage tank 100, the raw water supply unit 200, the concentrated liquid discharge unit 300, the treated water discharge unit 400, fine It includes a bubble supply unit 500 and a scraping unit 600.

The storage tank 100 is opened upwardly to the inside to form a storage space 102 for containing raw water.

In addition, the raw water supply unit 200 is provided to supply raw water to the storage space 102 of the storage tank 100.

Here, the raw water includes even high-concentration wastewater such as general wastewater, drinking wastewater, livestock wastewater, and digestive wastewater.

The concentrate discharge unit 300 is provided to discharge fine particles floating in the raw water of the storage tank 100.

In addition, the treated water discharge unit 400 is provided to discharge the treated water separated from the fine particles in the raw water of the storage tank 100.

The microbubble supply unit 500 generates microbubbles using the treated water of the storage tank 100 and supplies them to the storage space unit 102.

And the scraping unit 600 is located on the upper side of the storage tank 100, and separates and discharges the sludge floated by the moving scraper 640 to the concentrate discharge unit 300.

Accordingly, the solid-liquid separation device 10 using microbubbles can separate the supplied raw water and microbubbles, as the microbubbles and microparticles contained in the raw water are attached and floated.

The separated fine particles floating are discharged to the concentrate discharge unit 300 by the scraping unit 600, and some of the treated water is discharged to the treated water discharge unit 400, and the other part is the microbubble supply unit 500. As it is supplied to and circulates to the storage space unit 102 to generate microbubbles, raw water is diluted and microbubbles are supplied to improve treatment efficiency.

Here, the storage space part 102 of the storage tank 100 includes a mixing space part 102a, a floating space part 102b, and a separation space part 102c, as shown in FIG. 3.

The mixing space unit 102a is provided to mix the raw water supplied from the raw water supply unit 200 and the micro bubbles supplied from the microbubble supply unit 500.

In addition, in the floating space part 102b, raw water and microbubbles mixed in the mixing space part 102a are moved, and the microbubbles and attached microparticles are floated and separated.

The separation space part 102c is stored by moving the treated water from which the fine particles are separated from the floating space part 102b.

The mixing space part 102a, the floating space part 102b, and the separation space part 102c are partitioned by a first partition wall 110 and a second partition wall 120.

The first partition wall 110 is provided to partition the mixing space part 102a and the floating space part 102b, and the second partition wall 120 divides the floating space part 102b and the separation space part 102c. Is equipped for.

The first partition wall 110 and the second partition wall 120 are formed to communicate with the upper end of the corresponding space and are moved step by step.

Here, the upper end of the second partition wall 120 is positioned below the upper end of the first partition wall 110.

In addition, the upper end 112 of the first partition wall 110 is formed to be inclined toward the floating space portion 102b, is formed at 30 to 60 degrees, and is preferably formed at 45 degrees.

In addition, at least one treated water communication 122 for communicating the lower end of the second partition wall 120 with the lower end of the floating space 102b and the lower end of the separation space 102c is formed.

The area of the treated water communication 122 is formed to be smaller than the area communicated with the upper end of the second partition wall 120, and the amount of movement of the treated water moved through the treated water communication 122 is the upper communication part of the second partition wall 120 It is 5 to 30% of the amount of treated water that is transferred through.

In addition, the raw water supply step (S10) includes a raw water inflow step (S11), an inflow amount measurement step (S12), and a raw water amount control step (S13), as shown in FIG.

Prior to this, the raw water supply unit 200 includes a raw water supply pipe 210, a raw water pump 220, a flow sensor 230, and a raw water supply control unit 240.

The raw water supply pipe 210 is provided to supply raw water to the lower end of the mixing space 102a, and the raw water pump 220 is provided to supply raw water through the raw water supply pipe 210.

In addition, the flow sensor 230 is provided to measure the amount of raw water introduced through the raw water supply pipe 210, and the raw water supply control unit 240 controls the raw water pump 220 by receiving a signal from the flow sensor 230. Is equipped to

In the raw water inflow step S11, raw water is supplied to the mixing space 102a of the water storage space 102 along the raw water supply pipe 210 by the raw water pump 220 of the raw water supply unit 200.

In addition, the inflow amount measurement step (S12) measures the amount of raw water introduced through the raw water supply pipe 210 by the flow sensor 230 of the raw water supply unit 200.

In the raw water amount control step (S13), the raw water pump 220 is controlled by the raw water supply control unit 240 that has received the signal from the flow sensor 230 to control the inflow raw water amount.

As shown in FIG. 5, the micro-bubble supply step (S20) includes a treated water inflow step (S21), a gas inflow step (S22), a mixed solution generation step (S23), and a microbubble generation step (S24).

In addition, as shown in FIG. 6, the microbubble supply unit 500 includes a microbubble pump 510 and a treated water supply pipe 520, a gas supply unit 530, a mixed liquid supply pipe 540, and a microbubble pressure sensor ( 550) and a microbubble control unit 560.

The microbubble pump 510 is provided to form a gas-liquid mixture liquid by mixing the supplied treated water and gas.

In addition, the treated water supply pipe 520 is provided to supply the treated water of the separation space unit 102c to the microbubble pump 510, and the gas supply unit 530 is provided to supply gas to the microbubble pump 510. It is equipped.

The mixed liquid supply pipe 540 is provided to supply the gas-liquid mixed liquid formed in the microbubble pump 510 to the mixing space part 102a.

In addition, the microbubble pressure sensor 550 is provided to measure the pressure of the gas-liquid mixture liquid that is moved along the mixed liquid supply pipe 540.

The microbubble control unit 560 controls the microbubble pump 510 by receiving a signal from the microbubble pressure sensor 550.

In other words, by receiving a signal from the microbubble pressure sensor 550 to control the supply pressure, it is natural that the control is performed in connection with the supply amount of raw water or the amount of treated water.

Accordingly, the microbubble control unit 560 is linked with the raw water supply control unit 240 to control the generation amount of microbubbles when the supply of raw water is small or stopped.

Looking at the operating state of the microbubble supply unit 500, the treated water is supplied through the treated water supply pipe 520 by the microbubble pump 510, and the gas supplied from the gas supply unit 530 and the formed gas-liquid mixed liquid are mixed. When supplied to the mixing space 102a through the liquid supply pipe 540, it is deformed to normal pressure and generates microbubbles.

And the microbubble supply unit 500 further includes a pipe mixing unit 570.

The piping mixing unit 570 is provided for mixing by passing the mixed solution moving along the mixed liquid supply pipe 540 in a spiral manner.

The piping mixing unit 570 includes a piping mixing body 572 and a piping mixing screw 574.

The piping mixing body 572 is provided to communicate with the mixed liquid supply pipe 540.

In addition, the piping mixing screw 574 is provided in the piping mixing body 572 to guide the conveyed mixed liquid in a spiral manner to perform tertiary mixing.

Accordingly, it is possible to improve the efficiency of generating fine bubbles by improving the mixing ratio of the mixed solution.

Here, the microbubble pump 510 includes a pump body 512, a pump inlet 514, a pump outlet 516, and an impeller 518, as shown in FIG. 7.

The pump body 512 has a rotating space part 513 formed therein.

And the pump inlet 514 is formed in the pump body 510 for supplying the treated water and gas to the rotating space 513.

The pump outlet 516 is provided to supply the gas-liquid mixed liquid formed in the rotating space 513 to the mixed liquid supply pipe 540.

In addition, the impeller 518 has a double wing 519, and is rotatably provided in the rotational space 513 of the pump body 512.

Here, the area of the pump inlet 514 is formed larger than the area of the pump outlet 516.

In other words, the area of the pump inlet 514 is formed to be 1 to 4 times the area of the pump outlet 516.

This means that the pressure discharged to the pump outlet 516 is lower than the pressure introduced to the pump inlet 514, and the speed is reduced by the lowered pressure to form bubbles first.

Thereafter, when supplied to the mixing space part 102a, it is deformed to normal pressure and microbubbles are generated.

In addition, the double wing 519 includes a first wing 5192 and a second wing 5194, a first mixing furnace 5194 and a second mixing furnace 5198.

A plurality of first blades 5192 are formed at regular intervals along the edge of one surface of the impeller 518.

In addition, a plurality of second blades 5194 are formed at regular intervals along the edge of the other surface of the impeller 518.

The first mixing furnace 5194 is formed between the plurality of first blades 5192 and provided to guide and mix the treated water and gas flowing through the pump inlet 514.

In addition, the second mixing furnace 5198 is formed between the plurality of second blades 5194 and is provided to guide and mix the treated water and gas flowing through the pump inlet 514.

Here, at least one mixing communication hole 5199 for communicating the first mixing furnace 5194 and the second mixing furnace 5198 is further formed.

The mixing communication hole 5199 moves the treated water and gas moving along the first mixing furnace 5196 to the second mixing furnace 5198, and the treated water and gas moving along the second mixing furnace 5198 Is moved to the first mixing furnace 5194 to improve the mixing ratio.

The mixing communication hole 5199 is formed by an inclined yarn from the first mixing furnace 5194 to the second mixing furnace 5198, and is formed to be inclined downwardly from the edge of the impeller 518 to the center.

In addition, the mixing communication hole (5199) is formed to gradually decrease in diameter from the end where the mixed liquid is introduced to the end that is discharged.

Accordingly, by increasing the speed of the mixed liquid to be moved, it is moved at a different speed from that of the mixed liquid hit by the double wings 519 to improve the mixing rate.

In addition, the first blade 5192 is positioned between two adjacent second blades 5194, for example.

In addition, the first blade 5192 and the second blade 5194 are formed to be orthogonal to the corresponding surface of the impeller (518).

Each of the first wing 5192 and the second wing 5194 is formed in 40 to 100.

And the microbubble pump 510 is rotated at 1,900 ~ 3,600rpm, the treated water introduced through the treated water supply pipe 520 is 10 to 60wt% of the treated water of the separation space unit 102c, gas supply unit 530 The amount of gas supplied from) is 0.5 to 4% of the treated water introduced through the treated water supply pipe 520.

In addition, it is deformed at normal pressure in the mixing space part 102a, and the fine bubbles are 10 to 75 μm.

In the treated water inflow step (S21), a plurality of first wings 5192 and a first mixing furnace 5194 are formed on one side, and a plurality of second wings 5194 and a second mixing furnace 5198 are formed on the other side. The impeller 518 is a storage space part along the treated water supply pipe 520 by the microbubble pump 510 of the microbubble supply part 500 provided to be rotatable in the rotation space part 513 of the pump body 512 The treated water of 513 flows into the microbubble pump 510.

In the gas inflow step (S22), when the impeller 518 is rotated so that the treated water is introduced, gas is introduced into the rotating space part 513 through the gas supply part 530.

The mixed liquid generation step (S23) strikes the treated water and gas supplied by a plurality of rotating first blades 5192, second blades 5194, first mixing furnace 5194, and second mixing furnace 5198. And mix to form a mixed solution.

In addition, in the micro-bubble generation step (S24), as the mixed liquid generated by the impeller 518 is supplied to the mixing space part 102a through the mixed liquid supply pipe 540, the pressure is lowered to normal pressure to generate micro-bubbles.

And the mixed liquid generation step (S23), as shown in FIG. 8, includes a striking step (S231), a first mixing step (S232), and a second mixing step (S233).

In the striking step (S231), as the impeller 518 is rotated so that the first blade 5192 and the second blade 5194 are rotated, the treated water and the gas supplied to the rotating space part 513 are hit.

In addition, in the first mixing step (S232), the treated water and gas hitting are guided along the mixing furnace in the direction of the center of the impeller 518 to be first mixed.

In the second mixing step (S233), the mixed liquid first mixed by any one mixing furnace through the mixing communication hole 5199 formed to communicate the first mixing furnace 5196 and the second mixing furnace 5198 with each other. Moved to another mixing furnace and mixed secondarily.

Here, the mixed solution generating step (S23) further includes a third mixing step (S234).

In the third mixing step (S234), the mixed solution passing through the pipe mixing unit 570 is thirdly mixed.

Accordingly, the treated water and gas, which have been mixed two times through the second mixing step (S233), are mixed three times to improve the mixing ratio.

This, when the mixed liquid moves to the mixing space portion 102a, it is possible to increase the amount of microbubbles generated, thereby improving the treatment efficiency of raw water.

In addition, the micro-bubble supply step (S20) further includes a micro-bubble control step (S25), as shown in FIG. 9.

In this micro-bubble control step (S25), the micro-bubble control unit 560 receiving a signal from the micro-bubble pressure sensor 550 provided in the mixed liquid supply pipe 540 controls the micro-bubble pump 510 to control the micro-bubbles. Control the amount of production.

This fine bubble control step (S25) includes a pressure signal receiving step (S251) and a fine bubble adjusting step (S252).

In the pressure signal receiving step (S251), a signal from the microbubble pressure sensor 550 provided in the mixed liquid supply pipe 540 is received.

In addition, the microbubble control step (S252) controls the microbubble pump 510 by the microbubble control unit 560 receiving the signal from the microbubble pressure sensor 550 to control the treated water and gas supply unit of the separation space unit 102c. The amount of microbubbles generated is controlled by adjusting the gas inflow amount of 530.

Here, the microbubble supply step (S20) further includes a second microbubble control step (S26).

In the second microbubble control step (S26), the microbubble control unit 560 of the microbubble control step (S25) is connected with the raw water supply control unit 240 of the raw water quantity control step (S13) to correspond to the raw water inflow amount, so that the microbubble generation amount Control.

Here, the microbubbles supplied from the microbubble supply unit 500 function to float the microparticles and generate OH radicals.

More specifically, about 95% of the microbubbles float microparticles, and about 5% of them explode in water to generate OH radicals.

This OH radical can oxidize and decompose dissolved organic matter through advanced oxidation.

Accordingly, the floating material and the soluble material can be removed at the same time.

As shown in FIG. 10, the concentrate separation step (S50) includes a scraping step (S51), a concentrate discharge step (S52), and a scraper washing step (S53).

Here, the scraping part 600 includes a first rotating part 610 and a second rotating part 620, a connecting member 630, a scraper 640, and a driving part 650.

The first rotating part 610 is provided to be rotatable above the rear end of the separation space part 102c of the storage tank 100.

In addition, the second rotating part 620 is provided to be rotatable above the front end of the floating space part 102b of the storage tank 100.

The connecting member 630 is provided to rotate the first rotating part 610 and the second rotating part 620 in a caterpillar orbit in the same direction, and is preferably formed of a chain.

And the scraper 640 is provided on the connecting member 630 and rotates equally, so that the fine particles floating in the storage space 102 of the storage tank 100 are scraped and discharged to the concentrate discharge unit 300. .

The scraper 640 is formed to be curved, and is formed to be bent in the opposite direction in which the lower end is rotated.

Accordingly, when microbubbles with floating fine particles are discharged, movement of the treated water is minimized.

The driving unit 650 is provided to rotate the first rotation unit 610 or the second rotation unit 620 to rotate the connecting member 630 and the scraper 640 in an infinite orbit.

And the scraping part 600 further includes a scraping cleaning part 660.

This scraping and cleaning unit 660 is provided at the upper end of the concentrate discharge unit 300, and discharges the floating fine particles to the concentrate discharge unit 300, and then upwards along the first rotating unit 610. The surface of the scraper 640 is cleaned by scraping the surface of the rotating scraper 640.

The scraping and washing part 660 has elasticity and is formed to be inclined downward from the upper end of the concentrate discharge part 300 toward the first rotating part 610.

The concentrated liquid scraped from the surface of the scraper 640 falls to the concentrated liquid discharge unit 300 and is discharged.

In the scraping step (S51), as the connecting member 630 is rotated by the drive unit 650 of the scraping unit 600, the scraper 640 is rotated together, so that the floating space part 102b and the separation space part ( The fine particles floating in 102c) are scraped.

In addition, in the concentrated solution discharging step (S52), the concentrated solution is discharged to the concentrated solution discharging unit 300 by the scraping unit 600.

In the scraper cleaning step (S53), the fine particles are discharged by the scraping cleaning unit 660 provided at the upper end of the concentrated solution discharging unit 300, and the scraper 640 passing through the first rotating unit 610 is washed.

In addition, as shown in FIG. 11, the wastewater treatment method using microbubbles further includes a post-treatment step (S70), a fermentation step (S80), and a circulation step (S90).

To this end, the solid-liquid separation device 10 using fine bubbles further includes a treatment water tank 700 as shown in FIG. 12.

The treatment water tank unit 700 includes a treatment water tank 710 and a treatment water tank pump 720.

The treatment water tank 710 stores the treated water discharged through the treatment water discharge unit 400, and the treatment water tank pump 720 is provided to transfer the treated water stored in the treatment water tank 710 to a wastewater treatment plant.

In addition, the solid-liquid separation device 10 using microbubbles further includes a fermentation unit 800 and a circulation unit 900.

The fermentation unit 800 includes a raw water tank 810 and an acid fermentation tank 820, a pulverization unit 830, a digester 840, a storage tank 850, a second supply pump 860 and a gas discharge unit 870 do.

The raw water tank 810 stores the concentrate discharged through the concentrate discharge unit 300, and the acid fermentation tank 820 stores the concentrate stored in the raw water tank 810 and is fermented.

In addition, the pulverizing unit 830 pulverizes the concentrated liquid transferred from the raw water tank 810 to the acid fermentation tank 820.

The digester 840 is provided to store and decompose the fermented liquid fermented in the acid fermentation tank 820 using anaerobic organisms.

In addition, the storage tank 850 is provided to temporarily store some of the concentrate discharged through the concentrate discharge unit 300.

The second supply pump 860 is provided to supply the concentrated liquid stored in the storage tank 850 to the digester 840.

And the gas discharge unit 870 is provided to discharge the gas generated in the digester (840).

The gas discharged from the gas discharge unit 870 is biogas and includes hydrogen, methane, and the like.

Here, according to the solid-liquid separation device 10 using microbubbles, the solid-liquid separation rate is improved by 60% or more, and the amount of methane generated is improved by 15% or more than the conventional one.

In addition, the circulation unit 900 includes a digestive solution storage tank 910, a digestive solution discharge unit 920, and a circulation pump 930.

The digestive liquid storage tank 910 stores the digestive liquid decomposed in the digestion tank 840.

In addition, the digestive fluid discharge unit 920 transfers the digestive fluid stored in the digestive fluid storage tank 910 to a wastewater treatment plant.

The circulation pump 930 circulates the digestive fluid stored in the digestive fluid storage tank 910 to the storage tank 100.

Accordingly, the separation efficiency can be improved, as well as used as compost fertilizer, and treatment efficiency in a wastewater treatment plant can be improved.

The post-treatment step (S70) includes a treatment water tank storage step (S71) and a treated water transfer step (S72), as shown in FIG. 13.

In the treatment water tank storage step (S71), the treated water discharged through the treated water discharge unit 400 in the treated water discharge step (S60) is stored in the treatment water tank 710.

And the treated water transfer step (S72) transfers the treated water stored in the treatment water tank 710 by the treatment water tank pump 720 to the wastewater treatment plant.

In addition, the fermentation step (S80), as shown in Fig. 14, the raw water tank storage step (S81) and the concentrate pulverization step (S82), the concentrate fermentation step (S83), the concentrate decomposition step (S84), the concentrate temporary storage step (S85) ), a concentrated solution addition step (S86) and a gas discharge step (S87).

In the raw water tank storage step (S81), the concentrated liquid discharged through the concentrated liquid discharge unit 300 is stored in the raw water tank 810.

In the concentrated liquid pulverization step (S82), the concentrated liquid in the raw water tank 810 for storage in the acid fermentation tank 820 is pulverized by the pulverizing unit 830.

In the concentrated liquid fermentation step (S83), the concentrated liquid pulverized by the pulverizing unit 830 is stored in the acid fermentation tank 820 for fermentation.

In addition, in the concentrated liquid decomposition step (S84), the fermented liquid fermented in the acid fermentation tank 820 is stored in the digester 840 to be decomposed into anaerobic organisms.

In the concentrated liquid temporary storage step (S85), some of the concentrated liquid discharged through the concentrated liquid discharge unit 300 is temporarily stored in the storage tank 850.

In addition, the concentrated liquid addition step (S86) supplies the concentrated liquid stored in the storage tank 850 to the digester 840 by the second supply pump 860.

In the gas discharging step (S87), the gas generated in the digester 840 is discharged by the gas discharging unit 870.

In addition, the circulation step (S90) includes a digestive liquid storage step (S91), a digestive liquid transfer step (S92), and a digestive liquid circulation step (S93), as shown in FIG.

In the digestive liquid storage step (S91), the digestive liquid decomposed in the digester 840 is stored in the digestive liquid storage tank 910.

In addition, the digestive liquid transfer step (S92) transfers the digestive liquid stored in the digestive liquid storage tank 910 by the digestive liquid discharge unit 920 to a wastewater treatment plant.

In the extinguishing liquid circulation step (S93), the extinguishing liquid stored in the extinguishing liquid storage tank 910 by the circulation pump 930 is circulated to the storage tank 100.

10: solid-liquid separation device 100: storage tank
102: storage space portion 102a: mixed space portion
102b: floating space part 102c: separation space part
200: raw water supply unit 300: concentrate discharge unit
400: treated water discharge unit 500: microbubble supply unit
510: microbubble pump 520: treated water supply pipe
530: gas supply unit 540: mixed liquid supply pipe
550: fine bubble pressure sensor 560: fine bubble control unit
600: scraping part 610: first rotating part
620: second rotating part 630: connecting member
640: scraper 650: driving part
700: treated water tank 800: fermentation
900: circulation part

Claims (10)

A raw water supply step of supplying raw water to the storage space by a raw water supply unit in a state in which raw water, concentrate, and treated water are contained in the storage space portion of the storage tank;
A microbubble supply step of generating a mixed liquid by inhaling the treated water and gas in the storage space by a microbubble supply unit, and generating microbubbles by supplying the mixture to the storage space;
A microbubble mixing step in which the microbubbles and the raw water are mixed so that the microparticles contained in the raw water are attached to the microbubbles;
A microbubble floating step in which the microbubbles to which the microparticles are attached are floated upward and separated;
A concentrated liquid separation step of scraping and discharging the concentrated liquid floated by the scraping unit to the concentrated liquid discharge unit; And
Wastewater treatment method using microbubbles comprising; a treated water discharge step of discharging the treated water from which the concentrated liquid is separated to a treated water discharge unit. The method of claim 1, wherein the storage space part of the raw water supply step,
A mixing space for mixing the raw water supplied from the raw water supply unit and the micro bubbles supplied from the microbubble supply unit;
A floating space portion in which the raw water and microbubbles mixed in the mixing space portion are moved, and the microbubbles and the attached microparticles are floated and separated;
A separation space portion in which the treated water from which the fine particles are separated from the floating space portion is moved to be stored;
A first partition wall for partitioning the mixing space part and the floating space part; And
Wastewater treatment method using microbubbles comprising; a second partition wall for partitioning the floating space part and the separation space part. The method of claim 2, wherein the raw water supply step,
A raw water inflow step in which raw water is supplied to the mixing space portion of the storage space portion along a raw water supply pipe by a raw water pump of the raw water supply unit;
Inflow amount measuring step of measuring the amount of raw water introduced through the raw water supply pipe by a flow sensor of the raw water supply unit; And
Wastewater treatment method using microbubbles comprising; a raw water amount control step of controlling the raw water pump by controlling the raw water pump by the raw water supply control unit receiving the signal from the flow sensor. The method of claim 2, wherein the microbubble supply step,
A plurality of first blades and a first mixing path are formed on one surface, and an impeller having a plurality of second blades and a second mixing path is formed on the other surface to be rotatable in the rotating space of the pump body. A treated water inlet step in which the treated water of the storage space part flows into the microbubble pump along the treated water supply pipe by a bubble pump;
A gas inflow step in which gas is introduced into the rotating space through a gas supply unit when the impeller is rotated so that the treated water is introduced;
A mixed liquid generating step of striking and mixing the treated water and gas supplied by the plurality of rotating first blades, second blades, first mixing furnace, and second mixing furnace; And
As the mixed liquid generated by the impeller is supplied to the mixing space through a mixed liquid supply pipe, the pressure is lowered to normal pressure to generate fine bubbles. The method of claim 4, wherein the step of generating the mixed solution,
A striking step of striking the treated water and gas supplied to the rotating space unit as the impeller is rotated so that the first and second blades are rotated;
A first mixing step of first mixing by guiding the blown treated water and gas along a corresponding mixing furnace toward the center of an impeller; And
The second mixing step of moving the mixed solution first mixed by one of the mixing furnaces to another mixing furnace through a mixing communication hole formed to communicate the first mixing furnace and the second mixing furnace to each other and mixing them for a second time. Wastewater treatment method using microbubbles including; The method of claim 5,
Further comprising a pipe mixing unit for mixing by passing the mixed liquid moving along the mixed liquid supply pipe in a spiral,
A method for treating wastewater using microbubbles further comprising a third mixing step of tertiary mixing the mixed solution passing through the pipe mixing unit. The method of claim 4,
A method for treating wastewater using microbubbles, further comprising: a microbubble control step of controlling the microbubble pump by a control unit receiving a signal from the microbubble pressure sensor provided in the mixed liquid supply pipe to control the amount of microbubbles generated. The method of claim 7, wherein the microbubble control step,
A pressure signal receiving step of receiving a signal from a microbubble pressure sensor provided in the mixed liquid supply pipe; And
A microbubble control step of controlling the microbubble pump by the microbubble control unit receiving the signal from the microbubble pressure sensor to control the amount of water processed in the separation space and the gas inflow amount of the gas supply unit to control the generation amount of microbubbles; and Wastewater treatment method using fine air bubbles. The method of claim 8, wherein the microbubble control unit of the microbubble control step,
A method for treating wastewater using microbubbles further comprising: a second microbubble control step of controlling the generation amount of microbubbles in response to an inflow amount of raw water in connection with the raw water supply control unit of the raw water quantity control step. The method of claim 4, wherein the concentrated liquid separation step,
A scraping step of scraping the fine particles floating in the floating space part and the separation space part by rotating the scraper together as the connecting member is rotated by the driving part of the scraping part;
A concentrated solution discharging step of discharging the concentrated solution to the concentrated solution discharging unit by the scraping unit; And
Wastewater treatment method using microbubbles comprising; a scraper washing step of discharging fine particles by a scraping cleaning unit provided at the upper end of the concentrated liquid discharge unit and washing the scraper passing through the first rotating unit.

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