KR102110508B1 - Dissolved air flotation device capable of increasing organic matter recovery and water treatment method using the same - Google Patents

Abstract

The present invention relates to a dissolved air flotation device and a water treatment method using the same, and more particularly, to a dissolved air flotation device capable of increasing the recovery amount of organic matter and a water treatment method using the same. To this end, the dissolved air flotation device includes an agglomeration unit for forming and growing a floc by receiving water to be treated; Separation unit for the micro-bubbles to flow through the nozzle provided at the bottom, the micro-bubbles are attached to the floc, and the floc is floated to the water surface and removed; And a circulating water supply line for supplying circulating water in which air is dissolved by a nozzle provided in the separating unit. A dissolved air float (DAF) device comprising a stirrer disposed inside the agglomeration unit. An anaerobic tank to stir the water to be treated; A flock conveying line for conveying the flock removed from the separating part; And one side is connected to the anaerobic tank, the other side is connected to the floc conveyance line, after supplying microbubbles to the floc conveyed through the floc conveyance line using a nozzle provided at the bottom, aerobic tank conveying to the anaerobic tank; containing It is characterized by.

Description

DISSOLVED AIR FLOTATION DEVICE CAPABLE OF INCREASING ORGANIC MATTER RECOVERY AND WATER TREATMENT METHOD USING THE SAME}

The present invention relates to a dissolved air flotation device and a water treatment method using the same, and more particularly, to a dissolved air flotation device capable of increasing the recovery amount of organic matter and a water treatment method using the same.

In general, in the water treatment process or the seawater desalination process, suspended substances contained in raw water (treated water) should be removed to meet the water and drinking water standards. To this end, a water treatment process consisting of a mixing basin, a coagulation basin, and a floating basin is used to remove suspended particulate matter.

In the mixing tank, chemicals and raw water are rapidly mixed to flocculate the fine suspended matter first, and then discharged to the flocculation tank. In the flocculation tank, the suspended solids primarily flocculated by the mixing tank are grown to a size capable of flotation separation in the flotation tank. It is discharged to the floating tank arranged at the rear end.

The separation tank serves to float and remove aggregates grown in the flocculation tank, and attach a fine bubble to the suspended phase contained in the dispersion medium to the limit surface where the dispersion medium and air are in contact. Floating to induce solid-liquid separation.

Separation tanks are dissolved air flotation (DAF), dispersed air or cavitational air flotation (DAF), induced air flotation (IAF), and dust, depending on how microbubbles are generated. It can be implemented in various forms, such as the study float method, the electro-flotation method, and the microbiological auto-flotation method.

Among them, the dissolved air levitation method (DAF) utilizes the principle of dissolving air sufficiently in high pressure water and flowing it into the bottom of the separation tank, so that as high pressure water is decompressed in water, supersaturated air is blown out into fine bubbles. That is, the ejected micro-bubbles adhere to the floc in raw water, and the bubble-floc conjugate is a water treatment method in which solid-liquid separation is achieved while the specific gravity rises from the water to the water surface by buoyancy.

On the other hand, when the organic material adsorption process proceeds only from the aerobic process prior to solid-liquid separation, the organic material is oxidized by the oxidation of about 10 to 65% of the organic material depending on the amount and time of air injection and sludge retention time (SRT). mineralizaion) had a disadvantage that the recovery rate fell.

Accordingly, there is a need to develop a technology capable of increasing the recovery amount of organic matter.

Republic of Korea Patent Publication No. 2007-0064246

The present invention is to solve the problems as described above, the object of the present invention is to provide a dissolved air flotation device and a water treatment method using the same that can improve the recovery of organic matter.

The above and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The object is to form a floc by receiving the water to be treated and growing flocculant; Separation unit for the micro-bubbles to flow through the nozzle provided at the bottom, the micro-bubbles are attached to the floc, and the floc is floated to the water surface and removed; And a circulating water supply line for supplying circulating water in which air is dissolved with a nozzle provided in the separation unit; in a dissolved air float (DAF) device, disposed in a front end of an agglomeration unit, and a stirrer inside. An anaerobic tank provided to stir the water to be treated; A flock conveying line for conveying the flock removed from the separating part; And one side is connected to the anaerobic tank, the other side is connected to the floc conveying line, after supplying microbubbles to the floc conveyed through the floc conveying line using a nozzle provided at the bottom, an aerobic tank for conveying the floc to the anaerobic tank; It can be achieved by a dissolved air floating device comprising.

Preferably, the agglomeration unit comprises: a first misclumping unit that generates high-speed turbulence in order to form a floc primarily in the treated water to which the first turbulent-forming derivative is filled in the interior space; And a second mixed agglomeration that generates a slow turbulent flow at a lower rate than the first mixed agglomerate in order to grow the floc secondary to the water to be treated, which is filled with a second turbulence-forming derivative in the interior space and passes through the first mixed agglomeration. Wealth; may include. The first mixed agglomeration unit is provided in an upper side region of the second mixed agglomeration unit, and is characterized in that the treated water passing through the first mixed agglomeration unit is supplied to the second mixed agglomeration unit by gravity.

At this time, the first turbulent-forming derivative may be a multi-layered mesh-type material or a plurality of fiber bundles intertwined with each other, and the second turbulent-forming derivative may be a plurality of polling-type materials. .

In addition, the second miscible aggregation unit may be provided with a plurality of stages in a form in which the polling type material is filled with each other, and the plurality of stages may have a packing density of the polling type material toward the downstream side. It is preferably provided to be small.

In addition, the agglomeration portion may further include a porous separation membrane separating the first and second agglomerated agglomerates to maintain different turbulent intensities between the first and second agglomerated agglomerates.

Preferably, the separating part includes a plurality of floating tanks arranged in series continuously in the flow direction of the treated water, the adjacent floating tanks are partitioned by a partition wall, and the treated water is adjacent along a passage formed below the partition wall. You can move to the floating tank.

At this time, a height adjustable wear (adjustable weir) can be formed to pass the floating scum to the neighboring floating tank on the top of the partition wall, and a guide wall is formed at the bottom of the floating tank to float the micro bubbles upward, and the guide Fine bubbles may be introduced into the front and rear parts of the wall, respectively.

In addition, the separating unit includes a primary flotation tank in which flocculation and flotation are performed simultaneously; And a secondary flotation tank that injures and removes the floc contained in the treated water that has passed through the primary flotation tank.

Preferably, the circulating water supplied through the circulating water supply line may be treated water that has passed through the anaerobic tank.

At this time, the circulation water supply line, a pump for pressurizing the circulation water; And an inlet pipe through which atmospheric air flows at a predetermined position before the pump, and the inlet pipe may include an air flow meter and a valve to control the amount of atmospheric air introduced.

In addition, the circulating water supply line may include a stabilizer for dissolving undissolved bubbles in the circulating water at a predetermined position at the rear end of the pump.

In addition, the object, the flocculation step of forming and growing the floc by receiving the water to be treated; After supplying the micro-bubbles, the separation step of removing the floc by floating the floc to the water surface while the supplied micro-bubbles are attached to the floc; And a circulating water supply step of supplying circulating water in which air is dissolved so that fine bubbles are supplied in a separation step. The water treatment method comprising: before the agglomeration step, an agitation step of stirring the water to be treated under anaerobic conditions; A conveying step of conveying the flock removed in the separating step; And after supplying the micro-bubbles to the floc conveyed in the conveying step, a conveying step of conveying the floc to the stirring step; can be achieved by a water treatment method comprising a.

At this time, the agglomeration step may include: a first mixing and aggregation step of generating high-speed turbulence using a first turbulence-forming derivative filled in the interior space, in order to primarily form flocs in the treated water; And a second turbulence-forming derivative filled in the inner space to generate a slow turbulent flow at a lower rate than the first hybridization step, in order to grow the floc secondary to the water to be treated which has passed the first hybridization step. And a second mixing and flocculating step.

In addition, the separating step includes a primary flotation step in which flocculation and flotation are performed simultaneously; And a second flotation step in which flocs contained in the treated water that have passed the first flotation step are re-floated and removed again.

In addition, the circulating water supply step may include a stabilization step for dissolving undissolved bubbles in the circulating water.

According to the present invention, by returning the floc (sludge) removed from the separation unit to an aerobic tank in which microbubbles are supplied, microorganisms can secrete extracellular polymeric substances (EPS) under starvation conditions, It has the effect of reducing the amount of coagulant supplied separately to the water to be treated.

In addition, by supplying the floc conveyed through the aerobic tank to the anaerobic tank disposed at the front end of the agglomerate, it has an effect of increasing the recovery of organic matter.

In addition, it is possible to increase the removal efficiency of the floc by arranging the spray nozzle so that the water to be treated can move smoothly in the separation portion.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view schematically showing a dissolved air floating device according to an embodiment of the present invention.
2 is a view schematically showing an agglomeration unit according to an example.
3 is a view schematically showing an agglomeration unit according to an example.

Hereinafter, the present invention will be described in detail with reference to examples and drawings of the present invention. These examples are only provided by way of example to illustrate the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs, and in case of conflict, the present specification including definitions. The description will take precedence.

In order to clearly describe the proposed invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification. And, when it is said that a part "includes" a certain component, this means that other components may be further included instead of excluding other components, unless otherwise stated. In addition, "part" described in the specification means a unit or block that performs a specific function.

In each step, the identification numbers (first, second, etc.) are used for convenience of explanation. The identification numbers do not describe the order of each step, and each step does not explicitly describe a specific order in the context. It may be carried out differently from the order specified above. That is, each step may be performed in the same order as specified, or may be performed substantially simultaneously, or in the opposite order.

1 is a view schematically showing a dissolved air levitation apparatus 1000 according to an embodiment of the present invention. Referring to Figure 1, the dissolved air flotation apparatus 1000 according to an embodiment of the present invention is supplied with the water to be treated flocculation unit 100 to form and grow flocs; Separation unit 200 through which the microbubbles are introduced through the nozzle provided at the bottom, and the microbubbles introduced are attached to the floc to float and remove the floc to the water surface; And a circulating water supply line 300 for supplying circulating water in which air is dissolved with a nozzle provided in the separation unit 200; as a dissolved air float (DAF) device, the flocculation unit 100 is sheared Is disposed on, and equipped with a stirrer 410 inside the anaerobic tank 400 for stirring the water to be treated; Flock conveying line 500 for conveying the flock removed from the separation unit 200; And one side is connected to the anaerobic tank 400, the other side is connected to the floc conveyance line 500, and after supplying the microbubbles to the floc conveyed through the floc conveyance line 500 using the nozzle provided at the bottom, It includes; aerobic tank 600 to be transferred to the anaerobic tank 400.

The present invention is provided with a flock transfer line 500 to transfer the flock (sludge) removed from the separation unit 200 to the aerobic tank 600. The aerobic tank 600 is provided with a nozzle at the bottom to supply microbubbles to the floc conveyed through the floc conveyance line 500, so that the microorganisms stay under starvation conditions. When the microorganism is in the starvation condition, it releases extracellular polymeric substances (EPS), which functions as a coagulant in the subsequent process to significantly reduce the amount of coagulant supplied. .

In addition, the present invention supplies organic substances to polyhydroxyalkano by supplying the floc conveyed through the aerobic tank 600 to the anaerobic tank 400 together with the treated water supplied to the anaerobic tank 400 disposed at the front end of the agglomeration unit 100. Eight (polyhydroxyalkanoate, PHA) has the effect of being stored and recovered. Specifically, when adsorption of an organic material is performed in an aerobic process, oxidation of about 10 to 65% of the organic material proceeds depending on the amount of air injection, time, and sludge retention time (SRT), and the recovery rate decreases due to the mineralization of the organic material. In the present invention, phosphate accumulation organisms (PAOs) and glycogen accumulating organisms (GAOs) are effectively excluded from the oxidative process of these organic materials, thereby effectively decomposing organic matter. It has the effect of being able to convert into a form, and thereby increasing the recovery of organic matter.

In one embodiment, the flocculation unit 100 is to form and grow flocs by receiving the water to be treated transferred from the anaerobic tank 400, wherein the flocculant may use EPS formed at the front end. If a suitable amount of EPS is not secured, a separate coagulant may be additionally supplied. The agglomeration unit may be composed of a single agglomeration tank, and may be a non-powered agglomeration tank in which turbulent-forming derivatives are filled therein to generate turbulence, unlike a conventional mechanical mixing agglomeration tank. When configured as a non-powered coagulation tank, there is an advantage that the energy consumption rate can be minimized.

2 is a view schematically showing an agglomeration unit 100 according to an example. Referring to FIG. 2 in detail, the agglutination unit 100 is filled with a first turbulence-forming derivative 111 in an interior space. A first mixing and condensing unit 110 that generates high-speed turbulence to primarily form a floc in the input treated water; And the second turbulence-forming derivative 121 is filled in the inner space, so that the second flocculant 110 has a lower rate than the first hybridization unit 110 in order to grow the floc secondly in the water to be treated. It may include a; second mixed agglomeration unit 120 for generating a slow turbulent flow of. Through this configuration, the particles contained in the water to be treated may be circulated therein by turbulent flow without turbulent flow without separate agitation power, and can be aggregated to a certain size by contacting each other with a coagulant.

The first mixed agglomeration unit 110 is provided in an upper side region of the second mixed agglomeration unit 120, and the second mixed agglomeration unit 120 by gravity is processed water passing through the first mixed agglomeration unit 110 It is preferably supplied to.

Looking at the operation process of the non-power flocculation tank in more detail, the treated water flowing in the form of a straight water flow through the inflow pipe passes through the first turbulent forming derivative 111 filled in the first miscible aggregation unit 110 and rapidly. Turbulence is formed, and due to the generated turbulence, flocs are formed while particles and coagulants contained in the raw water are in contact with each other. The first turbulent-forming derivative 111 may be formed by stacking multiple layers of a mesh type material, or a plurality of fiber bundles intertwined with each other. Preferably, holes are vertical between adjacent mesh type materials. It can be stacked asymmetrically so as not to coincide in the direction. Since holes between the mesh-type materials are stacked asymmetrically in the vertical direction, turbulence can be generated while the water to be processed passes through the mesh-type material by gravity, and the speed of turbulence generated according to the size of the hole can be controlled.

The second mixed agglomeration unit 120 is a space where flocs included in raw water can grow due to the rapid turbulence generated while the treated water passing through the first mixed agglomeration unit 110 passes through the second turbulent forming derivative 121. to be. The second turbulent-forming derivative 121 may be a form in which a plurality of polling type materials are filled, and preferably, a plurality of polling type materials are filled in a plurality of separate forms. It may be a stacked form, and more preferably, as shown in FIG. 3, a plurality of stages may be provided in such a manner that the packing density of the polling type material decreases toward the downstream side.

That is, the second mixed agglomeration unit 120 can be used by controlling the number of stages filled with a polling type material according to the state of the water to be treated, and the plurality of stages are separated from each other and go toward the downstream region. It is desirable to configure the packing density to be small, because the lower the packing density, the lower the turbulence rate, so that the floc can grow into a larger mass.

In addition, the aggregation unit 100, the first mixing agglomeration unit 110 and the second mixing agglomeration unit 120 in order to maintain a different turbulence strength between the first mixing unit 110 and the second mixing unit 120 ) May be further included; a porous separator 130 to partition). That is, the first mixed agglomeration unit 110 generates a rapid turbulence, and the second mixed agglomeration unit 120 generates a slow turbulence to agglomerate the fine particles contained in the water to be treated to form and grow a floc. The speed of the slow turbulence is not particularly limited, and can be defined as a relative difference in turbulence intensity in the miscible tank.

In one embodiment, the separation unit 200 is a micro-bubble flows through the nozzle provided at the bottom, and the micro-bubbles introduced are attached to the floc to remove the floc by floating to the water surface, as shown in FIG. , It may include a plurality of floating tanks arranged in series continuously in the flow direction of the water to be treated, the adjacent floating tanks are partitioned by the partition wall 230, and the water to be treated is a passage formed under the partition wall 230. Follow him to the neighboring floating tank. The flocculation part of the conventional dissolved air flotation device is installed with a mechanical agitator separately to form a circulating water stream for inducing flocculation and flocculation between flocculants and suspended matter, and the capacity is increased to secure residence time. It was generally composed of multiple stages. However, the structure of the agglomeration unit requires a large site area, and is not only economical, but also has a high energy consumption rate, and causes some precipitation phenomenon at the rear end of the agglomeration unit, which has lowered the overall water treatment efficiency. Thus, the present invention, instead of configuring the agglomeration unit 100 as a single agglomeration tank, by separating the separation unit 200 into a plurality of floating tanks arranged in series in the flow direction of the water to be treated, flocculation and flocculation of the flotation tank It is characterized in that the injury can be made at the same time.

At this time, it is possible to separate and remove the scum (scum) floating in the floating tank at the top of the partition wall 230 through a skimmer, but preferably, the scum floating without the need to install a separate skimmer as shown in FIG. It is efficient to form a height-adjustable wear (adjustable weir) 231 for handing over to a neighboring floatation tank to be separated and removed through a skimmer in the last floatation tank.

In addition, a guide wall for floating the microbubbles upward may be formed at the bottom of the floating tank, and microbubbles may be introduced into the front and rear portions of the guide wall 240, respectively. By supplying microbubbles to the front and rear portions of the guide wall, the flocs that do not come into contact with the microbubbles at the front portion of the guide wall can be sufficiently brought into contact with the microbubbles again at the rear portion of the guide wall to improve the separation and removal efficiency of the flocs. Can be.

Preferably, the separation unit 200 includes a primary flotation tank 210 in which floc flocculation and flotation are performed simultaneously; And a secondary flotation tank 220 that refloats and removes flocs contained in the water to be treated that have passed through the primary flotation tank 210 again. At this time, the partition wall 230 for partitioning each floating tank may be provided with a spray nozzle 232 in accordance with the flow direction of the water to be treated. Referring to Figure 1 in more detail, by the nozzle provided at the bottom of the separation unit 200, the water to be treated may be formed in a flow from bottom to top, because of this flow, the horizontal movement of the treated water It is limited, which may cause a problem of poor processing efficiency. Accordingly, the partition wall 230 may be provided with an injection nozzle 232 at an angle to the partition wall 230 to smoothly control the horizontal movement of the water to be treated. That is, the leftmost partition wall 230 of FIG. 1 is provided with a spray nozzle 232 in a downward diagonal direction to the right to move the water to be treated by the micro bubbles generated at the bottom in the lower right direction. In addition, the rightmost partition wall 230 is provided with a spray nozzle 232 in a downward diagonal direction to allow the target water to move to the rear end. In addition, the injection nozzle 232 installed on the partition wall 230 also provides an effect of supplying more fine bubbles into the separation unit 200 in addition to the fine bubbles supplied by the nozzle installed at the bottom.

In one embodiment, the circulating water supply line 300 is to supply the circulating water in which air is dissolved to the nozzle provided in the separation unit 200, and micro bubbles can be supplied to the separation unit 200 through the nozzle. To make. In this case, the circulating water supplied through the circulating water supply line 300 may be treated water that has passed through the anaerobic tank 400 or treated water that has passed through the anaerobic tank 400 and a coagulant. Conventionally, it is common to use treated water (production water) that has been treated with circulating water. In this case, the treated water circulates through the floating tanks and continues to occupy part of the water treatment capacity (takes 10 to 20 vol% of the total water treatment capacity). As a result, this resulted in a reduction in the capacity of raw water capable of water treatment and a decrease in water treatment efficiency. On the other hand, in order to solve this, if the treated water that is not treated with circulating water is used, an effect of increasing the water treatment capacity can be obtained, but the amount of the treated water that has not passed through the agglomerated portion flows directly into the separation unit 200. The formation and growth of flocs in the treated water may not be sufficiently achieved, which may decrease the efficiency of water treatment.

Thus, the present invention comprises a separation unit 200, as in the prior art, consisting of a plurality of floating tanks continuously arranged in series in the flow direction of the raw water instead of a single floating tank so that aggregation and floating are simultaneously performed in the floating tank. In the case of using treated water or a mixture of flocculants, the formation and growth of flocs in the treated water are sufficiently made to prevent the water treatment efficiency from falling.

In addition, the circulating water supply line 300 includes a pump 310 that pressurizes the circulating water; And an inlet pipe 320 through which atmospheric air is introduced at a predetermined position before the pump 310. That is, air may be introduced into the front end of the pump 310 that pressurizes the circulating water, so that the pressurization of the circulating water and the dissolution of air in the circulating water can be simultaneously performed in the pump 310.

In the past, it was common to dissolve the pressurized water by contacting it with compressed air in a saturator after pressurizing the circulating water with a pump. However, the system using compressed air in this way requires a separate complex air compressor facility for generating compressed air, and increases the CAPEX and OPEX because the capacity of the service air of the plant must be increased. There was a problem.

In order to solve this problem, the present invention is to pressurize the circulating water in the pump 310 and dissolve the air in the circulating water by introducing atmospheric air to the front end of the pump 310 that pressurizes the circulating water instead of using compressed air. It can be done at the same time.

At this time, by installing an air flow meter and a valve separately in the inlet pipe 320 for introducing the atmospheric air to control the inflow of the atmospheric air, to minimize the cavitation or abnormal fluid phenomenon that may occur in the pump 310. Can be.

In addition, in the prior art, in order to dissolve compressed air in pressurized circulating water, a large-capacity saturator was used that filled the packing material or formed a structure to enlarge the internal surface area. However, since the present invention dissolves air in the pump 310, there is no need to use a conventional large-capacity saturation device.

However, the unresolved bubbles in the circulating water may be formed due to the short retention time in the pump 310 and the fluctuation of the air inflow. In order to re-dissolve in the circulating water, a separate stabilizer 330 is preferably formed at the rear end of the pump 310. The stabilizer 330 is for allowing undissolved bubbles in the circulating water to completely dissolve into the pressurized circulating water as they are aggregated and divided with each other, and is characterized in that the facility and capacity are much reduced compared to the existing saturation device.

In the case of using raw water as circulating water in the related art, it is easy to cause biofouling problems due to formation of microorganisms in the filling material inside the saturation device, which is more fatal in the case of a saturation device composed of a high-pressure, high-volume pressure vessel. Was. However, since the present invention does not use compressed air and a large-capacity saturation device, even when raw water is used as circulating water, there is no problem of biofouling in the saturation device and a decrease in saturation efficiency.

Next, a water treatment method using a dissolved air flotation device will be described. In explaining this, the above-described dissolved air levitation apparatus 1000 will be described, but is not limited thereto. In addition, since the dissolved air levitation apparatus 1000 has been described above, description of the overlapped portion is omitted.

A water treatment method according to an embodiment of the present invention comprises: an agglomeration step of forming and growing a floc by receiving water to be treated; After supplying the micro-bubbles, the separation step of removing the floc by floating the floc to the water surface while the supplied micro-bubbles are attached to the floc; And a circulating water supply step of supplying circulating water in which air is dissolved so that fine bubbles are supplied in a separation step. The water treatment method comprising: before the agglomeration step, an agitation step of stirring the water to be treated under anaerobic conditions; A conveying step of conveying the flock removed in the separating step; And after supplying the micro-bubbles to the flock conveyed in the conveying step, a conveying step of transferring the floc to the stirring step.

In the present invention, after the flock (sludge) removed in the separation step through the flock conveying step, micro-bubbles are supplied to the returned floe, so that the microorganisms stay under starvation conditions. When a microorganism is in a starvation condition, it releases extracellular polymeric substances (EPS), which acts as a coagulant in the subsequent water treatment process, dramatically reducing the supply of coagulant. Have

In addition, the supplied floc is supplied to the inlet of the dissolved air flotation device 1000 through a transfer step, and the organic substance is polyhydroxyalkanoate (PHA) by undergoing a stirring step of stirring with the water to be treated before the agglomeration step. ) It has the effect of being saved and recovered in the form. Specifically, when adsorption of an organic material is performed in an aerobic process, the organic material is oxidized by about 10 to 65% according to the air injection amount, time, and sludge retention time (SRT), so that the recovery rate decreases due to mineralization of the organic material. In the present invention, phosphate accumulation organisms (PAOs) and glycogen accumulating organisms (GAOs) are effectively excluded from the oxidative process of these organic materials, thereby effectively decomposing organic matter. It has the effect of being able to convert into a form, and thereby increasing the recovery of organic matter.

At this time, the agglomeration step is a step of forming and growing the floc by receiving the water to be treated, and may be performed by the agglomeration unit 100. Specifically, the agglomeration step includes a first hybridization and agglomeration step of generating high-speed turbulence to primarily form flocs in the treated water input using the first turbulence-forming derivative 111 filled in the interior space; And slow turbulence at a lower rate than the first hybridization step to grow the floc secondary to the treated water that has passed the first hybridization step using the second turbulence-forming derivative 121 filled in the inner space. The second flocculation and flocculation step to generate; can effectively form and grow flocs.

In addition, the separating step is a step of removing the flocs formed and grown through the coagulation step and then removing them, and may be performed by the separating part 200. Specifically, the separation step includes a primary flotation step in which flocculation and flotation are performed simultaneously; And a second flotation step in which flocs contained in the treated water that have passed through the first flotation step are re-floated and removed again. The grown flocs can be easily removed.

Meanwhile, the circulating water supply step is a step for supplying fine bubbles used in the separation step, and a part of the treated water that has passed through the anaerobic tank 400 may be used as circulating water. At this time, the stabilization step to dissolve the undissolved bubbles in the circulating water; may include. The stabilization step is to allow the circulating water to stay for a certain period so that the undissolved bubbles in the circulating water can be redissolved in the circulating water, and the stabilizer 330 having a much reduced facility and capacity compared to the existing saturation device can be used. have.

In this specification, only a few examples of the various embodiments performed by the present inventors are described, but the technical spirit of the present invention is not limited to or limited thereto, and can be variously implemented by a person skilled in the art.

1000: dissolved air flotation device
100: agglomeration
110: first mixing unit
111: first turbulent-forming derivative
120: second mixed condensation unit
121: second turbulence-forming derivative
130: separator
200: separation
210: 1st floating tank
220: secondary floating tank
230: bulkhead
231: height adjustment wear
232: spray nozzle
240: guide wall
300: circulating water supply line
310: pump
320: inlet piping
330: stabilizer
400: anaerobic tank
410: stirrer
500: floc return line
600: exhalation

Claims (21)

An agglomeration unit for forming and growing a floc by receiving water to be treated; Separation unit for the micro-bubbles to flow through the nozzle provided at the bottom, the micro-bubbles are attached to the floc, and the floc is floated to the water surface and removed; And a circulating water supply line for supplying circulating water in which air is dissolved with a nozzle provided in the separation unit, in a dissolved air float (DAF) device comprising:
An anaerobic tank disposed at the front end of the agglomerating portion and having an agitator therein to stir the water to be treated;
A flock conveying line for conveying the flock removed from the separating part; And
One side is connected to the anaerobic tank, the other side is connected to the floc conveying line, and after supplying microbubbles to the floc conveyed through the floc conveying line using a nozzle provided at the bottom, the aerobic tank conveying to the anaerobic tank includes;
The circulating water supplied through the circulating water supply line is treated water that has passed through the anaerobic tank,
The separating part includes a plurality of floating tanks arranged in series continuously in the flow direction of the water to be treated, the adjacent floating tanks are partitioned by a partition wall, and the treated water is moved to a neighboring floating tank along a passage formed below the partition wall. Moving,
The water to be treated flows from the bottom to the top by the nozzle provided at the bottom of the separating part, and guide walls for floating micro bubbles upward are formed at the bottom of the floating tank, respectively, at the front and rear parts of the guide wall. Micro bubbles are introduced,
Dissolved air levitation device characterized in that the injection nozzle is installed at an angle to the front or rear of the partition wall in which the passage is formed so as to smoothly control the horizontal movement of the water to be treated. The method of claim 1, wherein the agglomeration portion,
A first admixture agglomeration unit that generates a high-speed turbulence to form a floc primarily in the treated water to which the first turbulence-forming derivative is filled in the interior space; And
A second mixed agglomeration unit that generates a slow turbulent flow at a lower speed than the first mixed agglomeration unit in order to grow the floc secondary to the water to be treated which has passed through the first mixed agglomeration unit by filling the interior space with a second turbulent-forming derivative. Dissolved air floating device, characterized in that it comprises a. According to claim 2,
The first misclumping unit is provided in an upper side region of the second misclumping unit, characterized in that the treated water passing through the first misclumping unit is supplied to the second misclumping unit by gravity. According to claim 2,
The first turbulence-forming derivative is a multi-layered mesh (Mesh) type material, characterized in that the dissolved air flotation device. According to claim 2,
The first turbulence-forming derivative is a dissolved air flotation device, characterized in that a plurality of bundles of fibers intertwined with each other. According to claim 2,
The second turbulence-forming derivative is a plurality of polling (Pall Ring) type material, characterized in that the dissolved air flotation device. The method of claim 6,
The second mixed agglomeration unit is characterized in that a plurality of stages (stage) in a form filled with a polling type material is separated from each other, the dissolved air floating device. The method of claim 7,
The plurality of stages is characterized in that it is provided so that the packing density of the polling type material becomes smaller toward the downstream side, dissolved air floating device. The method of claim 2, wherein the flocculation part,
And a porous separator separating the first and second agglomerated agglomerates to maintain different turbulent intensities between the first and second agglomerated agglomerates. delete According to claim 1,
Dissolved air levitation device, characterized in that a height adjustable wear (adjustable weir) is formed to pass the scum (jumping) floating on the top of the bulkhead to the adjacent floating tank. delete According to claim 1, Separation unit,
A primary flotation tank in which floc flocculation and flotation occur simultaneously; And
And a secondary flotation tank for re-floating and removing flocs contained in the treated water that has passed through the primary flotation tank. delete According to claim 1, Circulating water supply line,
A pump that pressurizes the circulating water; And
Dissolved air floating device, characterized in that it comprises a; inlet pipe to the atmospheric air is introduced to a predetermined position of the pump front end. 16. The method of claim 15, Inlet piping,
Dissolved air levitation device, characterized in that provided with an air flow meter and a valve to control the amount of air entering. 16. The method of claim 15, Circulating water supply line,
And a stabilizer for dissolving undissolved bubbles in circulating water at a predetermined position at the rear end of the pump. A flocculation step of forming and growing flocs by receiving the water to be treated; After supplying the micro-bubbles, the separation step of removing the floc by floating the floc to the water surface while the supplied micro-bubbles are attached to the floc; And a circulating water supply step of supplying circulating water in which air is dissolved so that fine bubbles are supplied in the separation step.
Agitation step of stirring the water to be treated under anaerobic conditions before the agglomeration step;
A conveying step of conveying the flock removed in the separating step; And
Containing; after supplying the micro-bubbles to the floc conveyed in the conveying step, the floc is transferred to the stirring step;
The circulating water is the water to be treated after the stirring step,
The separation unit in which the separation step is performed includes a plurality of floating tanks continuously arranged in series in the flow direction of the water to be treated, the adjacent floating tanks are partitioned by a partition wall, and the treated water has a passage formed below the partition wall. Follow them to the neighboring flotation tank,
The water to be treated flows from the bottom to the top by the nozzle provided at the bottom of the separating part, and guide walls are formed at the bottom of the floating tank to float the micro bubbles upward, respectively, at the front and rear parts of the guide wall. Micro bubbles are introduced,
In order to smoothly control the horizontal movement of the water to be treated, characterized in that the spray nozzle is installed at an angle to the front or rear of the partition wall where the passage is formed, to further supply fine bubbles. The method of claim 18, wherein the aggregation step,
A first hybridization step of generating high-speed turbulence by using a first turbulence-forming derivative filled in the interior space to primarily form a floc in the treated water; And
In order to grow the floc secondary to the water that has passed through the first mixing and flocculating step, a second turbulence-forming derivative filled in the inner space is used to generate a slow turbulent flow at a lower rate than the first mixing and flocculating step. 2 mixing and flocculation step, characterized in that it comprises, a water treatment method. The method of claim 18, wherein the separation step,
A primary flotation step in which floc flocculation and flotation occur simultaneously; And
Characterized in that it comprises; a second flotation step of the flotation contained in the treated water that has passed through the first flotation step to rise and remove again. The method of claim 18, wherein the circulating water supply step,
Stabilization step for dissolving the undissolved bubbles in the circulating water; characterized in that it comprises, a water treatment method.

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