KR20200017200A - Apparatus of Treating Effluent from Water Treatment Plant - Google Patents

Abstract

The present invention relates to an effluent treatment apparatus for a water treatment plant. More specifically, the present invention relates to an effluent treatment apparatus for a water treatment plant. By applying air self-absorption method and supplying micro-bubbles with positive charge necessary for handling the flotation, there is no need for a separate air compressor, pressurized pump, large-capacity pressurized tank, etc., because compressed air is not used. By using a flocculant without a separate flocculant input space to form positively charged micro-bubbles and flowing the same into raw water together, the effluent treatment apparatus requires less investment in facilities and operating costs, and it is possible to minimize the space for installing the apparatus.

Description

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 solids, manganese, chloroform, volatile organic compounds and the like contained in the water treatment plant effluent in one process.

In general, a water treatment plant includes a water treatment plant that produces tap water using raw water, and a wastewater treatment plant that treats effluent such as sludge generated during water treatment. In general, the wastewater treatment facility is designed and operated mainly to remove suspended solids contained in sludge generated during the treatment of raw water, and then discharged after treatment.

Recently, due to the tightening regulations on the quality of effluents discharged from wastewater treatment facilities, the management of pollutants such as manganese and chloroform contained in effluents is more stringent, and the removal of particularly problematic pollutants such as manganese and chloroform is more efficient. Various facilities are required.

Accordingly, various apparatuses and methods for cleanly treating raw water have been devised until recently.

Among them, the flotation separation method is defined as a method in which the specific gravity of the suspension is smaller than water or by attaching a small bubble to the suspension to reduce the specific gravity to stop the surface of the water and separate it from the water. The decisive factor in this flotation is to reduce the hydrophilicity of the pollutants to bond the fine bubbles, which in this way can also float contaminants with heavier densities than water.

In the case of the pressure flotation tank to which the flotation separation method is applied, when a chemical (alum, etc.) is added to the raw water and stirred constantly, a floc is formed by combining foreign substances remaining in the water, and the raw water in which the floc is formed flows into the pressure flotation tank. When combined with bubbles generated in dissolved air mixed water, flocs are floated to the upper part and water in the lower part is a water treatment device.

In order to remove flocs efficiently in such a pressure flotation tank, the contact area between the floc and the dissolved air mixed water is more secured, and the bubbles of the dissolved air mixed water are finer, and the larger the distribution density of the bubbles, the more advantageous. . In addition, in order to generate such dissolved air mixed water, a dissolved air mixed water generator for mixing pressurized water and compressed air is required, and the performance and efficiency of the dissolved air mixed water generator is more compressed air is dissolved in the pressurized water, It is also advantageous to dissolve faster.

Accordingly, Korean Patent No. 1313169 discloses a high-purity water treatment apparatus for forming flocs in raw water and then precipitating the flocs and removing flotation in the secondary using pressurized water by compressed air. Korean Patent Laid-Open No. 2015-0062411 discloses a membrane filtration water purification system and a water treatment method for preliminary treatment of foreign matter contained in raw water by a pressurized air flotation method.

However, the above-described prior art pressurizes raw water or circulating water with a pressurized pump and then dissolves the pressurized water by contact with compressed air in a saturation apparatus, which is separately complicated to produce compressed air or pressurized water. The pressure pump equipment is needed, and the capacity of the service air of the plant has to be increased, thereby increasing the cost of CAPEX and OPEX.

On the other hand, according to the collision theory of the particles in the water, the most important factor to remove the particles by injecting microbubble is the electrostatic properties and size of the two factors, of which the electrostatic properties are known to be more important.

Most of the particles in the water are negatively charged, the micro-bubbles injected in the conventional water treatment method also has a negative charge. Therefore, in the related art, since the negatively charged particles must also collide with the negatively charged bubbles, there is a problem that the efficiency is lowered or the pretreatment is excessively increased.

Korean Registered Patent No. 1336169 (Notification Date: 2013.12.03) Korean Laid-Open Patent No. 2015-0062411 (Published Date: 2015.06.08)

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

In order to achieve the above object, one embodiment of the present invention, the flocculation agent is introduced to generate a positively charged microbubble, and the floc formed at the same time to form a floc by the positively charged microbubble raw water Microbubble generating unit to rise to the surface of the water; And a floating flotation tank having a skimmer unit for removing the floc floating by the positively charged microbubbles generated in the microbubble generating unit, wherein the microbubble generating unit is treated water treated in the floating buoy. A water supply unit having a circulation pump and a circulation pipe for supplying a supply water and introducing a flocculant into the supplied treated water to form a treated water having a positive charge; An injector unit formed on the discharge side of the water supply unit to suck external air into the circulation pipe; An air supply unit connected to the injector unit and provided with an intake valve to allow external air to be sucked by a pressure difference; The fine liquid is connected to one side of the injector unit and is discharged from the injector unit, and receives a mixed liquid mixed with air and positively charged treated water, and imparts positive charges by colliding the supplied mixed liquid with a collision plate or an inner wall installed therein. A chamber unit forming a bubble; And a plurality of bubble spraying units for injecting positively charged microbubbles formed from the chamber unit into the floating flotation tank.

In one preferred embodiment of the present invention, the chamber unit includes a main body having a space formed therein; An inlet connected to one side of the lower end of the main body to allow a mixed liquid mixed with air and positively charged 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; An impingement plate disposed adjacent to the end of the induction member to collide with the mixture solution passing through the mixture solution inducing member to form a micro bubble having positive charge; It may be characterized in that it comprises a; and the outlet is connected to the upper side of the main body is discharged to discharge the treated water including the micro-bubbles having a positive charge formed by the impingement plate.

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

In a preferred embodiment of the present invention, the flocculant may be characterized in that the poly aluminum chloride (poly aluminum chloride).

In a preferred embodiment of the present invention, the inflow amount of the flocculant may be characterized in that 0.5 mg / L ~ 25 mg / L.

In a preferred embodiment of the present invention, a plurality of guide walls for inducing mixing of raw water and positively charged microbubbles and floating flocs upward may be provided at the bottom.

Water treatment plant effluent treatment apparatus according to the present invention by applying the air self-absorption method to supply a fine charge having a positive charge required for the flotation treatment, do not use compressed air to separate air compressors, pressurized pumps, Not only does it require a pressurized tank, but also a small amount of facility investment and operating costs by minimizing the space for installing the device by injecting the coagulant into the raw water together with the positively charged microbubbles without a separate coagulant input space. Has the effect.

In addition, the water treatment plant effluent treatment apparatus according to the present invention forms a positive charge in the water by using a flocculant to increase the adhesion to the foreign matter having a negative charge, and a low pressure by using a high-speed collision method to form a positive charge water and air In addition, it is possible to make microbubbles with a positive charge having an average diameter of 200 μm or less, thereby increasing the contact efficiency and flotation of contaminants, and effectively treating contaminants in a short time. Concentration can reduce sludge production.

1 is a schematic diagram of a water treatment plant effluent treatment apparatus according to an embodiment of the present invention.
2 is a schematic diagram of a microbubble generating unit according to an embodiment of the present invention.
3 is a cross-sectional schematic view of a chamber unit in accordance with one embodiment of the present invention.
Figure 4 is a graph showing the treatment efficiency of the 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 one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

Throughout this specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding the other components unless otherwise stated.

Throughout this specification, terms such as “first”, “second”, and the like are intended to distinguish one component from another component, and the scope of rights shall not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The present invention provides a microbubble generating unit for introducing a flocculant to generate a positively charged microbubble, and to form a floc by the positively charged microbubble to float the formed floc to the surface of the raw water; And a floating flotation tank including a skimmer unit for removing the floc floating by the positively charged microbubbles generated in the microbubble generating unit, wherein the microbubble generating unit is treated water treated in the floating buoy. A water supply unit having a circulation pump and a circulation pipe for supplying a supply water and introducing a flocculant into the supplied treated water to form a treated water having a positive charge; An injector unit formed on the discharge side of the water supply unit to suck external air into the circulation pipe; An air supply unit connected to the injector unit and provided with an intake valve to allow external air to be sucked by a pressure difference; The fine liquid is connected to one side of the injector unit and is discharged from the injector unit, and receives a mixed liquid mixed with air and positively charged treated water, and imparts positive charges by colliding the supplied mixed liquid with a collision plate or an inner wall installed therein. A chamber unit forming a bubble; And a plurality of bubble spraying units for injecting positively charged microbubbles formed from the chamber unit into the floating flotation tank.

More specifically, in the conventional dissolved air flotation apparatus, a flocculant (alum, etc.) is added to raw water to constantly stir to form a floc, and the pressurized water is pressurized by a pressure pump and the pressurized water is compressed in a saturator. It is common to include a space in contact with air to generate microbubbles in which compressed air is dissolved. However, such a system using compressed air requires a separate complex air compressor, pressurized pump, etc. to generate compressed air, and increases the capacity of the service air of the plant and the input space of the flocculant, thereby increasing the CAPEX / OPEX cost. There was a problem.

In order to solve this problem, the purified water treatment plant effluent treatment device according to the present invention applies an air self-absorption method to supply fine bubbles having positive charge required for flotation treatment, and thus does not use compressed air. Without the need for a pressurized tank, by introducing the flocculant into the raw water together with the microbubbles without a separate flocculant input space, the facility investment costs, operating costs, etc. are reduced, and the space for installing the device can be minimized.

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

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 microbubble generating unit according to an embodiment of the present invention, Figure 3 is a chamber unit according to an embodiment of the present invention Is a cross-sectional schematic of.

Water treatment plant effluent treatment apparatus according to the present invention includes a floating flotation tank (200). The floating floating tank 200 is introduced with various foreign matters that let go through the micro-bubble generating unit 300, the positive charge having a positive charge, and let the negative ions such as suspended matter, manganese, chloroform, volatile organic matter, etc. contained in the raw water Coagulant is combined to form flocs and floats to remove with skimmer unit 450.

The micro-bubble generating unit 300 is disposed in the bottom portion of the floatation tank 200, is supplied with treated water (circulating water) discharged after the treatment is completed in the water treatment plant effluent treatment device, the flocculant is supplied to the treated water By dispersing, positively charged microbubbles are generated and introduced into the floating buoy.

In the related art, it is common to use treated water having completed water treatment as circulating water. In other words, since the treated water continues to circulate through the suspended floating tank, the water treatment capacity continues to be part of the volume (which occupies 10 vol% to 20 vol% of the total water treatment capacity), which in turn reduces the capacity of the raw water that can be treated and lowers the water treatment efficiency. It was a cause.

However, to solve this problem, the use of untreated water as circulating water caused another problem of reducing the saturation efficiency and reducing the water treatment efficiency by generating biofouling as raw water passes through the saturation device. In other words, the use of raw water as circulating water causes biofouling problems due to the formation of microorganisms in the filling material inside the saturation device.

The present invention, as described above, by using the treated water, that is, the circulating water as the water supplied to the microbubble generating unit 300, it is possible to improve the water treatment efficiency without using a large amount of the treated water as the circulating water, biofouling problem It can also be solved.

Specifically, the microbubble generating unit 300 according to the present invention supplies a treated water treated in the floating floatation tank, and introduces a flocculant into the supplied treated water to form a supply water having a positive charge circulating pump A water supply unit 310 having a 311 and a circulation pipe 312; An injector unit 320 formed at 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 to allow external air to be sucked by a pressure difference; Connected to one side of the injector unit 320 is supplied from the injector unit, the mixed solution of the air and the positively charged treated water is supplied, and the supplied mixed solution to impinge on the impingement plate 341 or the inner wall installed therein A chamber unit 340 forming a microbubble having a positive charge; And a plurality of bubble injection units 350 for injecting positive charges formed from the chamber unit 340 into the floating float 200.

The water supply unit 310 of the micro-bubble generating unit 300 to supply the treated water treated in the floating floatation tank, to introduce the flocculating agent into the supplied treated water to form a supply water having a positive charge The circulation pump 311 and the circulation pipe 312 is 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 inflow of the coagulant.

The chemical tank 111 is a coagulant is accommodated therein, a stirrer (not shown) is installed, each of the coagulant may be provided with a plurality of chemical tanks separately, the coagulant accommodated in the chemical tank is a coagulant to the circulation pipe 312 It is supplied through the input line 112, the input ratio of the coagulant may be adjusted by the coagulant transfer pump 113 to reflect the appropriate operating instructions according to the change in the state of the raw water. The control of the coagulant transfer pump is composed of a fixed-quantity diaphragm pump which is driven and controlled by a controller (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 agglomerate various foreign matters of the raw water to form and grow flocs.

The flocculant according to the present invention may be metal salts or synthetic polymers, natural polymers such as aluminum salts, iron salts, chitosan, polyacrylamide, etc., which are easily hydrolyzed in treated water to form a positively charged hydroxide polymer. .

More specifically, poly aluminum chloride (PAC), poly silicate iron, aluminum sulfate (Al ₂ (SO ₄ ) ₃ 8H ₂ O), ferrous sulfate (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 (Na ₂ Al ₂ O ₂ ), chitosan (chitosan), polyacrylamide selected from one or more organic-inorganic flocculant may be used, preferably It may be poly aluminum chloride (PAC).

In particular, polyaluminum chloride has a high positive charge and excellent coagulation ability, which not only can impart a positive charge to the treated water quickly, but also does not require alkalinity, which is an essential requirement for agglomeration, and has excellent storage stability. It is easy to add flocculant to the 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, when the concentration is less than 0.5 mg / L has a negative charge Due to the presence of a large amount of treated water and foreign matter, condensation and agglomeration do not occur, and thus the technical idea of the present invention cannot be accessed. When the concentration exceeds 25 mg / L, an inorganic coagulant such as iron or aluminum has a strong acid. As a result, the acidity of the raw water becomes acidic after treatment, which necessitates neutralization. In addition to this, the excessively supplied aluminum or iron components may be eluted after treatment, thereby increasing the possibility of deterioration of water quality 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 of the said 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 kinds of agar, starch, gelatin may be included, and the inorganic coagulant may be one or more of clay and activated silica. This can be used.

Thereafter, the treated water and the flocculant dispersed in the treated water received by the coagulant are introduced into the injector unit 320 along the circulation pipe 312 of the microbubble generating 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 (shown with a dotted arrow) into the circulation pipe 312, and includes a low power air suction pump. Although air may be injected into the circulation pipe, the present invention preferably uses a natural suction method, and allows the outside air to 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, and is connected to the air supply unit 330 provided with an intake valve 331 so that external air can be sucked by a pressure difference in a predetermined section, and the water When the circulation pump 311 of the supply unit is stopped or started up, the outside 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 such a structure, the air can be smoothly sucked into the treated water having both charges in which the introduced flocculant is dispersed without a separate power.

The chamber unit 340 collides with the inner wall (W) or the impingement plate (341) at high speed by mixing a mixture of the air sucked through the injector unit 320 and the positively charged treated water in which the flocculant is dispersed, It is a structure that forms microbubbles through turbulence while pulverizing particles to generate microbubbles.

Chamber unit 340 according to a preferred embodiment of the present invention includes a main body 342 having a space therein; An inlet port 343 connected to one side of the lower end of the main body 342 to allow a mixed solution of treated water mixed with air and a coagulant dispersed therein to flow 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; An impingement plate 341 installed adjacent to the end of the induction member to collide with the mixed liquid passing through the mixed liquid inducing member to form a micro bubble having positive charge; It is connected to the upper one side of the main body comprises a discharge port 345 for discharging the treated water containing the micro-bubbles having a positive charge formed by the impingement plate.

The main body 342 of the chamber unit is not particularly limited in shape, but may be formed in a cylindrical shape extending in a longitudinal direction and having a space formed therein, and an inlet 343 is connected to one side of the lower end of the main body to inject the unit. It is connected to the circulation pipe 312 of the side 320 is supplied with a mixed liquid mixed with the air flowing from the circulation pipe and the treated water having both charges dispersed in the flocculant.

In addition, the guide member 344 of the chamber unit provides a moving path of the mixed liquid through the inlet port 343. At this time, the mixed solution inducing member is provided inside the main body so as to extend along the longitudinal direction of the main body of the micro-bubble generating unit 300, specifically the micro-bubble generating unit. In a particular embodiment, the mixed solution guide member 344 may be in the form of a venturi tube to move along the inside of the mixed solution guide member and increase the flow rate of the mixed solution.

In addition, the impingement plate 341 of the chamber unit is installed to be adjacent to the mixed solution guide member 344 so that the mixed solution discharged from the end of the mixed solution guide member collides to form a fine bubble. In this case, the impingement plate may have a shape having an area larger than the end diameter of the mixed solution inducing member. The impingement plate may be formed in a convex protruding shape or a concave curved shape in order to easily contact the air and the positively charged treated water.

The mixed liquid colliding with the impingement plate 341 is finely bubbled due to the collision, so that the air contained in the mixed liquid is dissolved into the treated water having a positive charge, and then the water having the positively charged micro bubbles dispersed therein It is discharged to the plurality of bubble spray unit 350 through the discharge port 345 connected to the upper one side. The plurality of bubble spray units can be adjusted appropriately according to the size of the effluent treatment apparatus, preferably two or more.

In the chamber unit, the treated water in which the positively charged microbubbles discharged at a low pressure of 1.8 kgf / cm ² or less and the coagulant are dispersed is converted to atmospheric pressure in the flotation tank. The gas will promote the production of microbubbles.

The positively charged microbubble formed in the microbubble generating unit 300 has an average diameter of 200 μm or less, preferably 30 μm to 100 μm, which is most suitable for flotation, and improves contact efficiency and flotation of contaminants for a short time. Can effectively treat contaminants.

On the other hand, the skimmer unit 450 is configured to collect and move the flocs floating by the positively charged bubbles 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 collector 460, including the skimmer unit, is already well known, a detailed description thereof will be omitted.

In addition, the floating float 200 may be provided with a plurality of guide walls 201 in the bottom along the longitudinal direction of the float. The guide wall 201 may be applied without limitation as long as the microbubbles having positive charges flowing into the floating flotation tank and the coagulant contained in the treated water can be uniformly mixed with various foreign substances in the raw water. In the upper portion may be inclined form in accordance with the flow direction of the raw water. Such a guide wall is caused by the flocculation agent and the positively charged micro-bubbles introduced into the floating flotation tank through the microbubble generating unit bumps to the guide wall, the flocculant and raw water contained in the treated water as the process is repeated repeatedly Induces uniform mixing of the microbubbles and further refines the positively charged microbubbles so that various foreign substances in the raw water and the flocculating agent are mixed well to promote the formation and flotation of flocs.

The guide wall 201 allows the microbubbles having positive charges to be separately introduced into the front and rear surfaces of the guide wall, respectively, so that the floc also failed to contact the microbubbles having positive charges at the front of the guide wall. Ensure sufficient contact with the charged microbubbles.

On the other hand, the control unit (not shown) is a control panel for supplying power to the water purification plant effluent treatment apparatus of the present invention by the power supplied from the outside to perform electrical control, in particular the operation of the water treatment plant effluent treatment device, including the on / off control of the floating float. To control. In addition, to control the input ratio of the coagulant, the control unit is provided with an interface unit to receive the input rate of the chemicals from the manager, and correspondingly control the coagulant transfer pump of the coagulant input unit according to the time programmed so that the coagulant is added in response thereto. It is desirable to be configured to be.

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

The purified water treatment plant effluent treatment apparatus according to the present invention, when the raw water is introduced into the floating flotation tank 200, when the microbubbles and flocculents having positive charges supplied from the microbubble generating unit 300 are introduced into the raw water, Formed and grown into flocs combined with negatively charged sludge such as manganese, chloroform, volatile organics, and the like, the grown floc is floated to the upper part of the floating flotation 200 by the positively charged microbubbles. The flocs thus injured are removed by the skimmer unit 450 and collected by the floc collection unit 460, and the collected flocs are dewatered and then disposed of, and the treated water with the flocs removed is partially circulated to the microbubble generating unit described above. And the rest is discharged to the outside.

According to the present invention having such a structure and operation, not only can easily remove suspended solids, manganese, volatile organic matter contained in the sludge generated during the water treatment process, but also can improve the sludge concentration. The investment and operating costs are low, and the space for installing the facility can be minimized.

Hereinafter, the present invention will be described in more detail with reference to the following examples. In conclusion, these examples are only for illustrating the present invention in more detail, it is obvious to those skilled in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. something to do.

< Example  1>

The number of objects to be treated is Gongju Okryong Water Purification Plant, and the effluent treatment apparatus includes a floating flotation tank (W 1.5 m × L 2.4 m × H 1.5 m), as shown in FIG. Of the skimmer unit, and a flocculant used 5 mg / L of polyaluminum chloride (PAC). At this time, the treated water capacity of 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 flocculant concentrations shown in Table 1. In addition, the comparative example 1 is inflow water before flowing into a effluent treatment apparatus.

[ Experimental Example  1: Jar Test of Water Treatment Plant Effluent Treatment System]

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

division Flocculant 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 (inflow) - 25

As shown in Table 1, in Examples 1 to 5, all of the SS (suspended solid) of the treated water was found to be 10 ppm or less, which is an environmental regulation value, and particularly, in Example 3, in which the flocculant PAC concentration was 15 mg / L. In this case, SS of treated water was found to be 2 ppm, which satisfies the environmental regulation standard stably.

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

Using the effluent treatment apparatus of Example 3, the SS (suspended solids) treatment efficiency of the effluent treatment plant was measured. The measurement was repeated three times five times and the results are shown in FIG. 4.

As shown in Figure 4, the SS of the treated water appears to be 3 ppm to 6 ppm, it was confirmed that the environmental regulation value can be achieved stably. At this time, the water content of the removed sludge showed 93% ~ 94%.

 The specific parts of the present invention have been described in detail above, and it is apparent to those skilled in the art that such specific descriptions are merely preferred embodiments, and thus the scope of the present invention is not limited thereto. 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: flocculant input line
113: coagulant transfer pump 200: floating flotation
201: guide wall 300: microbubble generating unit
310: water supply unit 311: circulation pump
312: circulation pipe 320: injector unit
330: air supply unit 331: intake valve
340 chamber unit 341 impingement plate
342: main body 343: inlet
344: guide member 345: outlet
350: bubble spray unit 450: skimmer unit
460: floc collection

Claims (6)

A microbubble generating unit for generating a floc by injecting a flocculant and generating a floc by the microbubble having a positive charge, and simultaneously floating the floc formed on the surface of the raw water; And
It includes a floating buoy with a skimmer unit for removing while moving the floc floating by the positively charged microbubble generated in the microbubble generating unit,
The microbubble generating unit is a water supply unit having a circulation pump and a circulation pipe for supplying the treated water treated in the floating floatation tank, the flocculating agent is introduced into the supplied treated water to form a treated water having a positive charge;
An injector unit formed on the discharge side of the water supply unit to suck external air into the circulation pipe;
An air supply unit connected to the injector unit and provided with an intake valve to allow external air to be sucked by a pressure difference;
A fine liquid connected to one side of the injector unit and discharged from the injector unit receives a mixed liquid mixed with air and positively charged treated water, and imparts a positive charge by colliding the supplied mixed liquid with a collision plate or an inner wall installed therein. A chamber unit forming a bubble; And
Water treatment plant effluent treatment device comprising a plurality of bubble injection unit for injecting positive charge-bubble formed from the chamber unit into the floating float tank
The method of claim 1,
The chamber unit includes a main body having a space formed therein;
An inlet configured to be connected to one side of the lower end of the main body to allow a mixed liquid mixed with air and positively charged 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;
An impingement plate disposed adjacent to the end of the induction member to collide with the mixture solution passing through the mixture solution inducing member to form a micro bubble having positive charge; And
And a discharge port connected to an upper side of the main body and discharged from the treated water containing the microbubbles having positive charges formed by the impingement plate.
The method of claim 1,
The positive charge-bearing microbubble is a water purification plant effluent treatment device, characterized in that the average diameter is 200 ㎛ or less.
The method of claim 1,
The flocculant is poly aluminum chloride (poly aluminum chloride) characterized in that the water treatment plant effluent treatment device.
The method of claim 1,
The influent amount of the flocculant is 0.5 mg / L ~ 25 mg / L water treatment plant effluent treatment device.
The method of claim 1,
The floatation basin induces mixing of raw water and microbubbles with positive charges, and has a plurality of guide walls at the bottom of the flotation to float upward.

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