KR102109402B1 - Apparatus of Treating Effluent from Water Treatment Plant - Google Patents

Abstract

The present invention relates to a water treatment plant effluent treatment apparatus, more specifically, by applying an air self-suction method, by supplying micro bubbles having a positive charge necessary for handling an injury, by using compressed air, a separate air compressor (air compressor) or Not only does not need a pressurized pump, a large-capacity pressurized tank, etc., but also uses a flocculant without a separate flocculant input space to form micro-bubbles with positive charges and flows it into the raw water. The present invention relates to a effluent treatment system for a water purification plant capable of minimizing the space for installing the device.

Description

Purification plant effluent treatment system {Apparatus of Treating Effluent from Water Treatment Plant}

The present invention relates to a water treatment plant effluent treatment apparatus, and more particularly, to a water treatment plant effluent treatment apparatus capable of treating suspended substances, manganese, chloroform, and volatile organic compounds contained in the water treatment plant effluent in one process.

In general, a water treatment plant includes a water treatment facility that produces tap water using raw water, and a waste water treatment facility that treats discharged water such as sludge generated during water treatment. In general, the effluent treatment facility is designed and operated primarily for the removal of the suspended solids contained in sludge generated during the purification of raw water, and is discharged after treatment.

Recently, with the strengthened regulations on the quality of effluent discharged from effluent treatment facilities, the management of contaminants such as manganese and chloroform in effluent has been more strict, and more efficiently removing contaminants, especially manganese and chloroform, which are problematic. Various facilities are required.

Accordingly, various apparatuses and methods have been devised to cleanly treat raw water in water purification plants and the like until recently.

Among them, the floating separation method is defined as a method in which the specific gravity of a suspension is smaller than that of water or a small bubble is attached to the suspension to make the specific gravity small to stop it on the surface of water and separate it from water. The decisive factor in this separation method is to reduce the hydrophilicity of the contaminants to water, thereby adhering fine bubbles. In this way, contaminants with a heavier density than water can also float.

In the pressurized floatation tank to which the floating separation method is applied, when a chemical (alum, etc.) is added to the raw water and stirred constantly, a floc is formed in which foreign substances remaining in the water are combined, and the raw water in which the floc is formed flows into the pressurized floatation tank, thereby When combined with air bubbles generated from mixed water of dissolved air, the floc floats to the upper layer and the water in the lower layer refers to a water treatment device that becomes supernatant.

In order to effectively remove the floc from the pressurized floatation tank, the contact area between the floc and the dissolved air mixed water is secured more, and the bubbles of the dissolved air mixed water are finer, and the distribution density of the bubbles is more advantageous. . In addition, in order to generate such dissolved air mixed water, a dissolved air mixed water generator that mixes pressurized water and compressed air is required, and the performance and efficiency of the dissolved air mixed water generator are more dissolved in pressurized water, Also, the faster it dissolves, the better.

Accordingly, Korean Patent Registration No. 133169 discloses an advanced water treatment device that forms flocs on raw water, firstly precipitates the flocs, and secondly removes the flocks using pressurized water by compressed air. Patent Publication No. 2015-0062411 discloses a membrane filtration water purification system and a water purification method for pre-treatment of foreign substances contained in raw water by a pressurized air flotation method.

However, the above-described prior arts are those in which raw water or circulating water is pressurized with a pressurized pump, and then the pressurized water is dissolved by contact with compressed air in a saturation device, and a separate complex air compressor is used to generate compressed air or pressurized water. , Pressurized pump equipment is required, and since the capacity of the service air of the plant needs to be increased, there is a problem of increasing CAPEX and OPEX costs.

On the other hand, according to the collision theory of particles in water, it is known that the most important factors for removing particles by injecting microbubbles are the electrostatic properties and size of the two factors, and among them, the electrostatic properties are more important.

Most of the particles in the water are negatively charged, and the microbubbles injected in the conventional water treatment method also have a negative charge. Therefore, in the related art, there is a problem in that the efficiency is deteriorated or the pretreatment is excessive, because the negatively charged particles and the negatively charged bubbles must collide.

Korean Registered Patent No. 1336169 (Notice: 2013.12.03) Korean Patent Publication No. 2015-0062411 (Publication Date: 2015.06.08)

The object of the present invention is to solve the above problems, as well as removing heavy metals, volatile organic substances, manganese, chloroform, etc. contained in the sludge generated in the process of purifying raw water, as well as facility investment and operating costs It is to provide a effluent treatment system for a water purification plant that requires less and minimizes space for installing a facility.

In order to achieve the above object, an embodiment of the present invention, the flocculant is introduced to generate micro-bubbles having a positive charge, forming flocs by micro-bubbles having a positive charge, and simultaneously forming a floc by the micro-bubbles. Microbubble generating unit floating to the water surface of the; And a floater aid provided with a skimmer unit to remove the floc injured by the microbubble having a positive charge generated in the microbubble generating unit while the microbubble generating unit is treated water treated in the floating buoyant unit. And a water supply unit provided with a circulation pump and a circulation pipe for supplying and supplying a flocculant to the supplied treated water to form treated water having a positive charge; An injector unit formed on the discharge side of the water supply unit to suck outside air into the circulation pipe; An air supply unit connected to the injector unit and provided with an intake valve so that external air can be sucked by a pressure difference; Fine that is connected to one side of the injector unit and discharged from the injector unit is supplied with a mixed solution in which air and positively charged treated water are mixed, and the supplied mixed solution collides with a collision plate or inner wall installed therein to have positive charge. A chamber unit forming bubbles; And a plurality of bubble ejecting units for injecting micro-bubbles having a positive charge formed from the chamber unit into a floating float tank.

In a preferred embodiment of the present invention, the chamber unit includes a body having a space therein; An inlet that is connected to the lower side of the main body to allow the mixed liquid mixed with air and positively treated water to flow into the main body; An induction member connected to the inlet and providing a movement path of the mixed liquid introduced into the inlet; A collision plate installed adjacent to the end of the induction member and colliding with the mixed solution passing through the mixed solution induction member to form microbubbles carrying positive charges; And it is installed on the upper side of the main body is connected to the discharge port for discharging the treated water containing the micro-bubbles having a positive charge formed by the collision plate; may be characterized in that it comprises a.

In a preferred embodiment of the present invention, the microbubbles carrying the positive charge may be characterized in that the average diameter is 200 μm or less.

In one preferred embodiment of the present invention, the flocculant may be characterized in that it is polyaluminum chloride.

In a preferred embodiment of the present invention, the inflow of the flocculant may be characterized as 0.5 mg / L to 25 mg / L.

In one preferred embodiment of the present invention, it is possible to induce mixing of raw water and microbubbles having a positive charge, and it may be characterized in that a plurality of guide walls are provided at the bottom for floating the floc upward.

Purification plant effluent treatment apparatus according to the present invention by applying air self-absorption method by supplying a micro-bubble having a positive charge necessary for injury treatment, does not use compressed air, separate air compressor (air compressor), pressurized pump, large capacity In addition to the need for a pressurized tank, etc., by introducing the flocculant into the raw water with a positively charged micro-bubble without a separate flocculant input space, it requires less facility investment, operating costs, and minimizes the space for installing the device. Has an effect.

In addition, the water treatment plant effluent treatment apparatus according to the present invention forms a positive charge in water using a coagulant so as to increase the adhesion with a foreign substance having a negative charge, and a low pressure using a high-speed collision method of water and air having the positive charge formed Even in this case, it is possible to make micro bubbles with a positive charge having an average diameter of 200 μm or less, thereby increasing the contact efficiency and floatability of contaminants to effectively treat the contaminants in a short time, and to float the suspended microbubbles in high concentration. It can be concentrated to reduce the amount of sludge.

1 is a schematic view of a water treatment plant effluent treatment apparatus according to an embodiment of the present invention.
2 is a schematic diagram of a microbubble generation unit according to an embodiment of the present invention.
3 is a schematic cross-sectional view of a chamber unit according to an embodiment of the present invention.
4 is a graph showing the treatment efficiency of a water treatment plant effluent treatment apparatus according to an embodiment of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art.

Throughout this specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless specifically stated to the contrary.

Throughout the present specification, the terms "first", "second", and the like are intended to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The present invention generates a micro-bubble having a positive charge by introducing a flocculant, a micro-bubble generating unit that floats the floc formed by the micro-bubbles having a positive charge to the surface of the raw water at the same time; And a floater aid provided with a skimmer unit to remove the floc injured by the microbubble having a positive charge generated in the microbubble generating unit while the microbubble generating unit is treated water treated in the floating buoyant unit. And a water supply unit provided with a circulation pump and a circulation pipe for supplying and supplying a flocculant to the supplied treated water to form treated water having a positive charge; An injector unit formed on the discharge side of the water supply unit to suck outside air into the circulation pipe; An air supply unit connected to the injector unit and provided with an intake valve so that external air can be sucked by a pressure difference; Fine that is connected to one side of the injector unit and discharged from the injector unit is supplied with a mixed solution in which air and positively charged treated water are mixed, and the supplied mixed solution collides with a collision plate or inner wall installed therein to have positive charge. A chamber unit forming bubbles; And a plurality of bubble injection units for injecting micro-bubbles having a positive charge formed from the chamber unit into the floating floating tank.

More specifically, the conventional dissolved air flotation device is a space in which floc is formed by stirring a certain amount of flocculant (alum, etc.) in raw water and compressed water is compressed in a saturator after the circulating water is pressurized with a pressure pump. It is common to include a space that generates microbubbles in which compressed air is dissolved in contact with air. However, the system using compressed air requires additional complex air compressors, pressurized pumps, etc. to generate compressed air, and increases the CAPEX / OPEX cost because the capacity of the service air of the plant and the space for adding the coagulant must be increased. There was a problem.

In order to solve this problem, the water treatment plant effluent treatment apparatus according to the present invention applies air self-suction method to supply micro-bubbles with positive charge required for floating treatment, so compressed air is not used, so an air compressor, pressurized pump, or large capacity It does not need a pressurized tank, and by introducing the flocculant together with the micro-bubbles into the raw water without a separate flocculant input space, it requires less facility investment and operating costs, and minimizes the space for installing the device.

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

1 is a schematic diagram of a water treatment plant effluent treatment apparatus according to an embodiment of the present invention, Figure 2 is a schematic diagram of a micro-bubble generation unit according to an embodiment of the present invention, Figure 3 is a chamber unit according to an embodiment of the present invention It is a cross-sectional schematic.

The water treatment plant effluent treatment apparatus according to the present invention includes a floating float 200. The floating floating tank 200 is introduced with various foreign matters that trap negative ions such as suspended substances, manganese, chloroform, and volatile organic substances contained in raw water by introducing micro bubbles having a positive charge through the micro bubble generating unit 300. The flocculants are combined to form a floc and float to remove it with the skimmer unit 450.

The micro-bubble generation unit 300 is disposed on the bottom surface of the floating floating tank 200, receives the treated water (circulating water) discharged after being processed by the water treatment plant effluent treatment device, and supplies flocculant to the supplied treated water Disperses to generate positively charged micro-bubbles and flows into the floating floating tank.

Conventionally, it is common to use the treated water whose water treatment is completed with circulating water. That is, since the treated water continues to circulate through the floating flotation, the water treatment capacity continues to occupy a part (10 vol% to 20 vol% of the total water treatment capacity), which consequently reduces the capacity of raw water capable of water treatment and lowers water treatment efficiency. It was cause to let.

However, in order to solve this problem, when raw water that is not treated with circulating water is used, the raw water passes through the saturation device to generate biofouling, thereby reducing saturation efficiency and lowering water treatment efficiency. That is, when raw water is used as circulating water, a biofouling problem occurs 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.

The present invention is water supplied to the micro-bubble generating unit 300 as described above, by using treated water, that is, circulating water, it is possible to improve water treatment efficiency by not using large-capacity treated water as circulating water, and problems with biofouling. It can also be solved.

Specifically, the micro-bubble generating unit 300 according to the present invention supplies the treated water treated in the floating flotation tank, and a circulating pump for supplying the flocculant to the supplied treated water to form and supply treated water having a positive charge. 311 and the circulation pipe 312 is provided with a water supply unit 310; An injector unit 320 formed on a discharge side of the water supply unit 310 to suck external air into the circulation pipe 312; An air supply unit 330 connected to the injector unit 320 and provided with an intake valve 331 so that external air can be sucked by a pressure difference; It is connected to one side of the injector unit 320 and is supplied with a mixed liquid discharged from the injector unit, a mixture of air and positively treated water, and collides the supplied mixed liquid with a collision plate 341 or an inner wall installed therein. A chamber unit 340 for forming microbubbles carrying positive charges; And a plurality of bubble ejecting units 350 for injecting micro bubbles having a positive charge formed from the chamber unit 340 into the floating float 200.

The water supply unit 310 of the micro-bubble generating unit 300 supplies the treated water treated in the floating flotation tank, and flows a flocculant into the supplied treated water to form and supply treated water having a positive charge. A circulation pump 311 and a circulation pipe 312 are provided.

In addition, the water supply unit 310 may further include a chemical tank 111, a coagulant input line 112, and a coagulant transfer pump 113 for smooth flow of coagulant.

The chemical tank 111 has a coagulant accommodated therein, a stirrer (not shown) is installed, and a plurality of chemical tanks can be provided separately for each coagulant, and the coagulant accommodated in the chemical tank is a coagulant with a circulation pipe 312 It is supplied through the input line 112, and the ratio of the input of the flocculant can be adjusted and input by the flocculant transfer pump 113 to reflect the appropriate operating instructions according to the change in the state of raw water. Control of the flocculant transfer pump consists of a quantitative diaphragm pump driven and controlled through a control unit (not shown).

The flocculant is dispersed in the treated water supplied to the water supply unit to impart a positive charge to the treated water and flows into the floating flotation tank to aggregate various foreign substances in the raw water to form and grow flocs.

The coagulant according to the present invention can be easily hydrolyzed to treated water to form a positive (+) positively charged hydroxide polymer, a metal salt or synthetic polymer, natural polymer, such as aluminum salt, iron salt, chitosan, polyacrylamide, etc. .

More specifically, poly aluminum chloride (PAC), poly silicate iron, aluminum sulfate (Al ₂ (SO ₄ ) ₃ 8H ₂ O), ferrous sulfate: FeSO ₄ H ₂ O), Ferric Sulfate: Fe ₂ (SO ₄ ) ₃ ), Ferric Chloride: FeCl ₃ , Calcium Hydroxide: Ca (OH) ₂ , Calcium Oxide (Calcium Oxide: CaO), sodium aluminate (Sodium Aluminate: Na ₂ Al ₂ O ₂ ), chitosan (chitosan), polyacrylamide (polyacrylamide) selected from one or more organic and inorganic coagulants may be used, preferably It may be polyaluminum chloride (PAC: Poly Aluminum Chloride).

In particular, polyaluminum chloride has a high positive charge and excellent cohesion, so it can not only give positive charge to treated water quickly, but also does not require alkalinity, which is an essential requirement for coagulation, and has excellent storage stability. It is easy to add flocculant to treated water.

At this time, the flocculant is preferably supplied to maintain a concentration of 0.5 mg / L to 25 mg / L, preferably 5 mg / L to 20 mg / L, and when the concentration is less than 0.5 mg / L, it has a negative charge. Due to the presence of a large amount of treated water and foreign substances, condensation and agglomeration do not occur and the technical idea of the present invention cannot be approached, and when the concentration exceeds 25 mg / L, inorganic coagulants such as iron or aluminum take a strong acid. As it is present, the acidity of the raw water after treatment becomes acidic, and there is a disadvantage that it must be neutralized. In addition, the aluminum or iron components supplied in excess after treatment may be eluted, which increases the possibility that water quality is deteriorated by heavy metals of aluminum or iron. Therefore, in order to purify the effluent of the water purification plant, it is preferable to supply the flocculant at the above concentration.

In the present invention, an inorganic coagulant or an organic coagulant may be used, and in the case of an organic coagulant, one or more of agar, starch, and gelatin may be included, and the inorganic coagulant is at least one of clay and active silica. Can be used.

Subsequently, the coagulant dispersed in the treated water and the treated water that has been given a positive charge due to the coagulant flows into the injector unit 320 along the circulation pipe 312 of the microbubble generation unit.

The injector unit 320 is formed on the discharge side of the circulation pump 311 of the water supply unit to suck external air (indicated by the dotted arrow) into the circulation pipe 312, and is provided with a low-power air intake pump. Air may be injected into the circulation pipe, but in the present invention, a natural suction method is preferably used, and external air may be sucked by dropping the pressure inside the circulation pipe through the injector unit 320.

The injector unit 320 is formed to gradually increase the inner diameter, is connected to the air supply unit 330 equipped with an intake valve 331 so that the outside air can be sucked by a pressure difference in a certain section, the water At the beginning of the stop or start of the circulation pump 311 of the supply unit, external air is naturally sucked into the circulation pipe 312 through the intake valve 331 of the air supply unit. At this time, the amount of air sucked through the intake valve can be adjusted, and through this structure, air can be smoothly sucked into the treated water having a positive charge in which the introduced coagulant is dispersed without additional power.

The chamber unit 340 collides with a mixture of air sucked through the injector unit 320 and treated water having a positive charge dispersing a coagulant at a high speed against the inner wall (W) or the collision plate 341, thereby It is a structure that forms microbubbles through turbulence while pulverizing particles to generate microbubbles.

The chamber unit 340 according to a preferred embodiment of the present invention includes a body 342 having a space therein; An inlet port 343 connected to a lower end of the main body 342 to allow a mixed liquid in which treated water having a positive charge dispersed with air and a coagulant flows into the main body; An induction member 344 connected to the inlet to provide a movement path of the mixed liquid introduced into the inlet; A collision plate 341 installed adjacent to the end of the induction member and colliding with the mixed solution passing through the mixed solution induction member to form microbubbles carrying positive charges; It is connected to the upper side of the main body and includes an outlet 345 through which the treated water containing micro bubbles having positive charges formed by the collision plate is discharged.

The body 342 of the chamber unit is not particularly limited in shape, but may be formed in a cylindrical shape extending in the longitudinal direction and having a space therein, and the inlet 343 is connected to and installed at one lower side of the body to injector unit It is connected to the circulation pipe 312 on the side of 320, and is supplied with a mixed solution in which the air introduced from the circulation pipe and the treated water having a positive charge in which a coagulant is dispersed are mixed.

In addition, the induction member 344 of the chamber unit provides a movement path of the mixed liquid through the inlet 343. At this time, the mixed liquid inducing member is provided inside the main body so as to extend along the length direction of the micro-bubble generation unit 300, specifically, the micro-bubble generation unit. As a specific aspect, the mixed liquid inducing member 344 moves along the interior of the mixed liquid inducing member and may be in the form of a venturi tube to increase the flow rate of the mixed liquid.

In addition, the collision plate 341 of the chamber unit is installed adjacent to the mixed liquid inducing member 344 so that the mixed liquid discharged from the end of the mixed liquid inducing member collides and forms microbubbles. At this time, the collision plate may have a shape having an area larger than the terminal diameter of the mixed liquid inducing member. Here, for easy contact between the air and the positively charged treated water, the collision plate may be formed in a convexly protruding shape or a concavely curved shape in which the portion colliding with the mixed solution is convexly superior.

The mixed liquid colliding with the collision plate 341 is finely bubbled due to collision, so that the air contained in the mixed solution is dissolved as treated water having a positive charge, and then the water in which the fine bubbles having a positive charge is dispersed is the body of the body. It is discharged to a plurality of bubble injection unit 350 through the outlet 345 connected to the upper side. The number of the bubble injection units may be appropriately adjusted in number according to the size of the effluent treatment apparatus, and preferably two or more.

In the chamber unit, the treated water in which micro-bubbles and coagulants having positive charges discharged at a low pressure of 1.8 kgf / cm ² or less are dispersed, the pressure is converted to normal pressure in a floating float tank, and the overdissolved by this pressure difference The gas promotes the formation of microbubbles.

The micro-bubbles having a positive charge formed in the micro-bubble generating unit 300 have an average diameter of 200 μm or less, preferably 30 μm to 100 μm, which is most suitable for injury, and increases contact efficiency and floatability of contaminants for a short time. Can effectively treat contaminants.

On the other hand, the skimmer unit 450 is a configuration that collects while moving the flocs floating by the bubbles having a positive charge generated in the micro-bubble generating unit 300, it is possible to use a conventional skimmer unit such as a chain drive type, , Since the configuration of the floc collection unit 460 including the skimmer unit is already widely known, a detailed description thereof will be omitted.

In addition, the floating float 200 may be provided with a plurality of guide walls 201 at the bottom along the longitudinal direction of the floating float. The guide wall 201 may be applied without limitation as long as it is a form that can be uniformly mixed with various foreign substances in the raw water and the fine bubbles having a positive charge flowing into the floating floating tank and the flocculant contained in the treated water, but preferably the lower part It may be inclined according to the flow direction of the raw water as it goes from the top to the top. In the guide wall, the flocculant introduced into the floating flotation tank through the microbubble generation unit and the microbubbles having a positive charge hit the guide wall and rise. As this process is repeated, the flocculant and raw water contained in the treated water By inducing uniform mixing of, and further minimizing the micro-bubbles carrying positive charges, various foreign substances in the raw water and the introduced coagulant are well mixed to promote floc formation and injury.

The guide wall 201 allows the micro bubbles having a positive charge to flow separately to the front and rear portions of the guide wall, so that the flocs that do not come into contact with the micro bubbles having a positive charge at the front of the guide wall are also positive at the rear portion of the guide wall. It should be able to make sufficient contact with the charged microbubbles.

On the other hand, the control unit (not shown) is supplied with power from the outside to supply power to the water treatment plant effluent treatment device of the present invention and controls the electrical control, especially the floating float relief on / off control, including the operation of the water treatment plant effluent treatment device Control. In addition, for controlling the input ratio of the flocculant, the control unit is provided with an interface unit to receive the input ratio of the drug from the manager, and in response to this, to control the flocculant transfer pump of the flocculant input portion according to the time already programmed so that the flocculant input is made. It is preferably configured to be.

The operation of the purification plant effluent treatment apparatus according to the present invention having such a configuration will be briefly described.

The water treatment plant effluent treatment apparatus according to the present invention flows raw water into the floating flotation tank 200, and when microbubbles and flocculants with positive charges supplied from the microbubble generation unit 300 are introduced into the raw water, suspended substances in the raw water, While combined with sludge having a negative charge such as manganese, chloroform, volatile organics, etc., it forms and grows as a floc, and the grown floc is floated to the top of the floating float 200 by micro-bubbles having a positive charge. The floc thus floated is removed by the skimmer unit 450 and collected by the floc collection unit 460, and the collected floc is dewatered and disposed of, and the treated water from which the floc is removed is partially circulated to the aforementioned microbubble generation unit. And the rest is discharged to the outside.

According to the present invention having such a structure and operation, it is possible to simultaneously remove floating substances, manganese, and volatile organic substances contained in the sludge generated in the process of purifying raw water at the same time, and improve sludge concentration, and It has the effect of minimizing the space required to install the facility while requiring less investment and operating costs.

Hereinafter, the present invention will be described in more detail through the following examples. In conclusion, these examples are only intended to describe the present invention in more detail, and it is obvious to those skilled in the art that the scope of the present invention is not limited by these examples according to the gist of the present invention. something to do.

< Example  1>

The water to be treated was targeted at the Princess Okryong Water Purification Plant, and the effluent treatment device includes a floating float (W 1.5 m × L 2.4 m × H 1.5 m), as shown in FIG. 1, and a chain-driven type to the floating float. Was equipped with a skimmer unit, and 5 mg / L of polyaluminum chloride (PAC) was used as the coagulant. At this time, the capacity of the treated water in the effluent treatment apparatus was set to 150 m3 / day.

< Example  2 to 5 and Comparative example  1>

The same effluent treatment apparatus as in Example 1 was used, but the effluent was treated with the concentration of the coagulant shown in Table 1. In addition, Comparative Example 1 is influent water before flowing into the effluent treatment apparatus.

[ Experimental Example  1: Jar Test of water treatment plant effluent treatment system]

In order to derive the optimal flocculant concentration, Jar Test was performed for each flocculant concentration under the same conditions, and the results are shown in Table 1. The raw water means raw water to be treated before being introduced into the effluent treatment apparatus, and the treated water refers to effluent treated and discharged by the effluent treatment apparatus.

division Coagulant concentration (mg / L) SS (mg / L) Example 1 5 4 Example 2 10 3 Example 3 15 2 Example 4 20 4.5 Example 5 25 7 Comparative Example 1 (influent) - 25

As shown in Table 1, in the case of Examples 1 to 5, all of the suspended solids (SS) of the treated water appeared to be 10 ppm or less, which is an environmental regulation standard, and in particular, the concentration of the PAC concentration of 15 mg / L In the case, SS of treated water was found to be 2 ppm, stably meeting the environmental regulation standard.

[ Experimental Example  2: Measurement of treatment efficiency of water treatment plant effluent treatment system]

The effluent treatment device of Example 3 was used to measure the SS (suspended solids) treatment efficiency of the water treatment plant effluent treatment system. The measurement was repeated three times five times, and the results are shown in FIG. 4.

As shown in FIG. 4, it was confirmed that the SS of the treated water was 3 ppm to 6 ppm, thereby stably achieving the environmental regulation value. At this time, the water content of the removed sludge was 93% to 94%.

 Since the specific parts of the present invention have been described in detail above, it is obvious to those skilled in the art that this specific technique is only a preferred embodiment, whereby the scope of the present invention is not limited. something to do. Therefore, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

111: Chemical tank 112: Coagulant input line
113: flocculant transfer pump 200: floating flotation
201: guide wall 300: micro-bubble generation unit
310: water supply unit 311: circulation pump
312: circulation piping 320: injector unit
330: air supply unit 331: intake valve
340: chamber unit 341: collision plate
342: main body 343: inlet
344: induction member 345: outlet
350: bubble injection unit 450: skimmer unit
460: floc collection unit

Claims (6)

A micro-bubble generating unit that flows a flocculant to generate micro-bubbles having positive charges, forms flocs by micro-bubbles having positive charges, and floats the formed floes to the surface of the raw water; And
It includes a floating buoyancy provided with a skimmer unit to remove while moving the floe injured by the micro-bubble having a positive charge generated in the micro-bubble generating unit,
The microbubble generating unit supplies the treated water treated in the floating flotation tank, and the amount of the flocculant that is hydrolyzed to the supplied treated water to form a positively charged hydroxide polymer is 0.5 mg / L to 25 mg / L. A water supply unit provided with a circulation pump and a circulation pipe to flow into and form and supply treated water having a positive charge;
An injector unit formed on the discharge side of the water supply unit to suck outside air into the circulation pipe;
An air supply unit connected to the injector unit and provided with an intake valve so that external air can be sucked by a pressure difference;
Fine that is connected to one side of the injector unit and discharged from the injector unit is supplied with a mixed solution in which air and positively charged treated water are mixed, and the supplied mixed solution is collided with an impingement plate or inner wall installed therein to have positive charge. A chamber unit forming bubbles; And
And a plurality of bubble injection units for spraying micro-bubbles having a positive charge formed from the chamber unit into a floating float tank.
According to claim 1,
The chamber unit has a body having a space therein;
An inlet that is connected to the lower side of the main body to allow the mixed liquid to be mixed with air and positively charged treated water into the main body;
An induction member connected to the inlet and providing a movement path of the mixed liquid introduced into the inlet;
A collision plate installed adjacent to the end of the induction member and colliding with the mixed solution passing through the mixed solution induction member to form microbubbles carrying positive charges; And
And a discharge port through which treatment water containing micro-bubbles having positive charges formed by a collision plate is installed and connected to an upper side of the main body to be discharged.
According to claim 1,
The positive charge-bearing micro-bubbles have an average diameter of 200 µm or less.
According to claim 1,
The flocculant is a polyaluminum chloride (poly aluminum chloride) water treatment plant effluent treatment device, characterized in that.
delete According to claim 1,
The floating flotation induces the mixing of raw water and microbubbles having a positive charge, and a plurality of guide walls for floating the floc upward are provided at the bottom of the water treatment plant effluent treatment apparatus.

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