KR101990774B1 - Dissolved air flotation type wastewater processing apparatus with microbubble contacting part equipped with latitudinal distribution cone formed with hole and microbubble water complex pump - Google Patents

Abstract

The present invention relates to a dissolved air flotation type wastewater treatment apparatus having a microbubble contact part equipped with a vertical distribution cone formed with a distribution cone hole and a microbubble water complex pump. The flow of wastewater and flocs can be smooth in a longitudinal direction through the distribution cone hoe, and the microbubble water is supplied to the microbubble contact part without pressure loss and coagulation of the microbubbles though the microbubble water complex pump and the microbubble water supply pipe. By bringing a uniform distribution of microbubbles in the microbubble contact part, the maintenance cost according to the installation cost and power consumption is low.

Description

Dissolved air flotation type wastewater processing apparatus with microbubble contacting part equipped with latitudinal distribution cone formed with hole and microbubble water complex pump}

The present invention relates to a sewage treatment apparatus, in particular a floating sewage treatment apparatus having a micro-bubble contact portion equipped with a horizontal distribution cone with a distribution cone hole and a micro-bubble water composite pump.

Floating sewage wastewater treatment device attaches floating contaminants in dispersing medium such as sewage or waste water to the microbubbles to float to the surface where the dispersing medium and air are in contact with each other to remove contaminants or sludges attached to the water surface. Water treatment device.

The flotation separation method used in the wastewater treatment apparatus includes a mechanical injury method, a pressurized injury method, an electrolytic injury method, a microbiological flotation method and the like. The mechanical flotation method is not suitable for floating separation of purified water, secondary treated sewage water, etc. because of the high turbulent flow, which may cause the floc to be destroyed. The method of generating fine bubbles decomposes, and consumes a lot of power, and has a disadvantage in that scale is generated and attached to an electrode plate for electrolyzing water. Therefore, the sewage and pressurization methods are used in the majority of secondary treated sewage or drinking water.

Pressurized flotation method removes contaminants by buoyancy by generating micro bubbles of less than 100 μm and attaching them to contaminants, and removes contaminants by buoyancy. It requires a lot of power to maintain the pressure at 4 to 6 atm, so the economy is very poor.

Meanwhile, the conventional flotation type sewage treatment apparatus discharges microbubbles from a plurality of nozzles installed at predetermined intervals on the bottom of the microbubble contact portion, thereby allowing the microbubble to rise uniformly in the microbubble contact part to float the flocs flowing together with the wastewater. However, in the process of discharging the air dissolved by high pressure through the branch pipe through a plurality of nozzles having a narrow discharge port diameter, pressure loss occurs as the diameter of the bubble increases due to the fusion of microbubbles, resulting in power consumption. There was a limit to increase maintenance costs.

Korean Patent Registration No. 1054087 Korean Registered Patent No. 1722099

The present invention is a microbubble complex pump and microbubble supply pipe without using a branch pipe and / or a plurality of nozzles that cause pressure loss and coagulation of microbubbles, as well as accessory equipment with high power consumption such as a pressurized pump, a compressor and a pressurized tank. While supplying the microbubble water to the microbubble contact without pressure loss and agglomeration of the microbubbles, bringing a uniform distribution of the microbubble in the microbubble contact, the maintenance cost according to the installation cost and power consumption is low, and also through the distribution cone hole An object of the present invention is to provide a floating separation sewage treatment apparatus having a horizontal distribution cone having a distribution cone hole capable of smoothly flowing the wastewater and floc in the longitudinal direction, and a microbubble contact portion equipped with a microbubble water composite pump.

The present invention, the mixing unit 10 for mixing the flocculant in the incoming wastewater to produce a floc in the wastewater; Agglomeration unit 20 for growing the floc in the wastewater by stirring and introducing the wastewater that has passed through the mixing unit 10; A microbubble guide plate installed in the water from the bottom to the top of the partition wall 321, the two side partitions (322, 323) and the other side is formed in communication with the lower portion of the condensation portion 20 ( A microbubble contact portion 30 formed surrounded by 33; Microbubble water discharge portion 40 for supplying microbubble water in the bottom direction from the bottom of the microbubble contact portion 30 to the wastewater flowing into the wastewater inlet 31; The waste water flows in contact with an upper portion of the microbubble contacting part 30 together with the floc contacted with the microbubble from the microbubble contacting part 30, and the floc contacted with the microbubble floats on the surface by buoyancy to form a sludge layer. Floating sludge separation tank 50; Floating sludge discharge unit 60 is discharged from the collected sludge installed on the other side of the upper side of the side in communication with the micro-bubble contact portion 30 of the floating sludge separation tank 50 to collect the collected sludge; A float sludge collector 70 installed on the surface of the float sludge separation tank 50 to collect the sludge; A treated water temporary storage tank 80 communicating with a lower portion of the floating sludge separation tank 50 to store treated water from which sludge has been removed; In the floating sewage sewage treatment apparatus comprising a; and a treated water storage tank 90 in communication with the upper portion of the treated water temporary storage tank for storing the treated water,

In the longitudinal direction between the partition wall 321 and the microbubble guide plate 33 on which the wastewater inlet 31 is formed, and the width direction between the two side partitions 322 and 323, the microbubble contact portion 30 is formed. An elliptical cone-shaped distribution cone 35 having a narrow longitudinal direction and a long width direction is formed on the bottom surface 34,

The microbubble water discharge unit 40 is provided with a microbubble water supply pipe 43, is installed vertically so that the microbubble water supply pipe 43 is discharged in the direction of the vertex of the distribution cone 35,

In the longitudinal direction between the partition wall 321 and the microbubble guide plate 33 on which the wastewater inlet 31 is formed, and the width direction between the two side partitions 322 and 323, the microbubble contact portion 30 is formed. The ratio of width to length is 1: 0.5 to 1: 2,

The distribution cone hole 353 is formed at the side surface of the partition wall 321 of the distribution cone 35 toward the microbubble guide plate 33.

The fine bubble water discharge portion 40,

An inlet 411 through which the treated water and air are supplied;

The splitter 412 through which the treated water and air flowing downward from the inlet 411 flow.

The rotating grid 413 which is provided in the dividing unit 412 and rotates while separating the treated water and air into the dividing plate 4131 spaced at a predetermined interval while rotating to form fine bubble water, and

An inner space 4143 extending upward from the dividing portion 412 and increasing and decreasing in diameter toward the upper portion, an outlet 4414 formed at a distal end portion of which the diameter of the inner space 4143 is reduced, and the outlet A microbubble complex pump 41 including; a discharge part 414 including a blocker plate 4414 protruding downwardly about the periphery;

The mixed water supply pipe 421 to which the mixed water of the microbubble water and the agglomerated bubble water discharged from the discharge port 4141 of the microbubble water composite pump 41 is supplied, and the pressure control valve 422 and the excess pressure air discharge pipe 423. The pressure excess air separation tank 42 is provided; And

And a fine bubble water supply pipe (43) for discharging the fine bubble water of a predetermined pressure and less than a predetermined size from the pressure excess air separation tank (42).

The present invention is a microbubble complex pump and microbubble supply pipe without using a branch pipe and / or a plurality of nozzles that cause pressure loss and coagulation of microbubbles, as well as accessory equipment with high power consumption such as a pressurized pump, a compressor and a pressurized tank. While supplying the microbubble water to the microbubble contact without pressure loss and agglomeration of the microbubbles, bringing a uniform distribution of the microbubble in the microbubble contact, the maintenance cost according to the installation cost and power consumption is low, and also through the distribution cone hole It is possible to provide a floating separation sewage treatment apparatus having a micro-bubble contact portion equipped with a horizontal distribution cone and a microbubble water composite pump having a distribution cone hole for smoothly flowing the sewage and floc in the longitudinal direction.

1 is a diagram illustrating a configuration of a conventional floating sewage sewage treatment apparatus including a pressure pump, a compressor, a line mixer, and a pressure tank, and having a branch pipe and a plurality of nozzles in a microbubble water supply pipe.
Figure 2 is a plan view of the microbubble contact portion of the conventional floating sewage sewage treatment apparatus of FIG.
3 is a configuration explanatory diagram of a floating sewage sewage treatment apparatus according to an embodiment of the present invention having a microbubble complex pump, a pressure excess air separation tank, and only a microbubble water supply pipe without a nozzle or branch pipe.
4A is a plan view (top) and a front view (bottom) of a cone-shaped distribution cone, and FIG. 4B is a plan view (top) and a front view (bottom) of an inclined cone-shaped distribution cone, and FIG. 4C is a tilted rudder. Top view (top) and front view (bottom) of the cone-shaped distribution cone, Figure 4d is a top view (top) and front view (bottom) of the distribution cone formed by the curved main line of the elliptical cone inclined, Figure 4e Is a plan view (top) and a front view (bottom) of a distribution cone having a microbubble guide plate installed on a side of a microbubble guide plate of a distribution cone in which an inclined elliptical cone is concavely curved, and FIG. 4B is a plan view (top) and a front view (bottom) of a distribution cone in which a microbubble guide plate is installed on the microbubble guide plate of a concave curved distribution cone, and a microbubble blocker is formed on the partition wall, and FIG. Of this concave curved distribution cone Top view (top) and front view (bottom) of the distribution cone, in which the microbubble guide plate is installed on the high-strength bubble guide plate, and the distribution cone hole is formed on the partition wall, and the distribution cone hole gradually widens from the partition wall toward the microbubble guide plate. to be.
FIG. 5 is an enlarged cross-sectional view of a lower portion of the portion A microbubble contact of FIG. 3.
FIG. 6 is an enlarged left side view of the lower portion of the portion A microbubble contact of FIG. 3.
FIG. 7 is a plan view of the distribution cone and the microbubble water supply pipe portion formed on the bottom surface of the microbubble contact portion of the floating sewage sewage treatment apparatus according to the embodiment of the present invention when viewed from above the microbubble water contact portion. FIG.
Figure 8 is a front sectional view of the microbubble complex pump of the floating sewage sewage treatment apparatus according to an embodiment of the present invention.

1 is a diagram illustrating the configuration of a conventional flotation wastewater treatment apparatus, and FIG. 2 is a plan view of the microbubble contact unit.

1 and 2, a conventional flotation type sewage treatment apparatus includes: a mixing unit 10 having a rapid stirrer 11 for mixing flocculant with incoming wastewater to generate flocs in the wastewater; The first flocculation tank 21 having a slow stirrer 211 for flowing the wastewater that has passed through the mixing unit 10 to the lower side and agitating to grow flocs in the wastewater, and the first aggregation tank 21 and the upper portion. An agglomeration portion 20 having a second agglomeration tank 22 which communicates with and descends to further grow the floc; A microbubble guide plate installed in the water from the bottom to the top of the partition wall 321, the two side partitions (322, 323) and the other side is formed in communication with the lower portion of the condensation portion 20 ( A microbubble contact portion 30 formed surrounded by 33; A microbubble water discharge part 44 for supplying microbubble water from the lower part of the microbubble contact part 30 to the sewage water flowing into the wastewater inlet 31; The waste water flows in contact with an upper portion of the microbubble contacting part 30 together with the floc contacted with the microbubble from the microbubble contacting part 30, and the floc contacted with the microbubble floats on the surface by buoyancy to form a sludge layer. Floating sludge separation tank 50; Floating sludge discharge unit 60 is discharged from the collected sludge installed on the other side of the upper side of the side in communication with the micro-bubble contact portion 30 of the floating sludge separation tank 50 to collect the collected sludge; A float sludge collector 70 installed on the surface of the float sludge separation tank 50 to collect the sludge; A treated water temporary storage tank 80 communicating with a lower portion of the floating sludge separation tank 50 to store treated water from which sludge has been removed; And a treated water storage tank (90) communicating with an upper portion of the treated water temporary storage tank for storing the treated water.

The microbubble water discharge unit 44 is an inlet pipe 441 for sucking up the treated water of the temporary storage tank 80, a pressure pump 442 for sucking up the treated water from the inlet pipe 441 and discharging it at a high pressure; Compressor 443 for supplying compressed air to the pressurized treated water conveying pipe, a line mixer 444 for mixing the pressurized treated water and compressed air, and pressurized mixed water of the treated water and compressed air to dissolve air Pressurized tank 445, a mixed water supply pipe 446 for transporting the mixed water of the pressurized treated water and the compressed air from the pressure tank to the lower portion of the microbubble contact portion 30, a plurality of minutes branched from the mixed water supply pipe The engines 4451 and 4462 and a plurality of microbubble water supply nozzles 4446 and 4464 provided at the plurality of branch pipes at predetermined intervals.

The flotation wastewater treatment apparatus of the related art is floc grown in the flocculation unit 20 is floated in the process of the wastewater flows to the microbubble contact portion 30 and the flotation sludge separation tank 50 by the flotation sludge collector 70 Removed.

However, the conventional floating sewage sewage treatment apparatus requires a large-capacity pressurized tank 445 to increase dissolution efficiency in order that air dissolves in the treated water in the pressurized tank 445, and also a compressor to promote dissolution of air. 443 is additionally required, and in the process of discharging air dissolved by high pressure through a plurality of nozzles through a branch pipe, through a plurality of nozzles having a narrow diameter of the outlet, the pressure loss is generated while the diameter of the bubble increases due to the fusion of microbubbles. Efficiency is reduced, installation costs are high, there was a problem that the maintenance costs are also required by high power requirements.

Hereinafter, the present invention will be described with reference to FIGS. 3 to 8.

Figure 3 is a floating air separation sewage treatment apparatus according to an embodiment of the present invention having a micro bubble water composite pump 41, a pressure excess air separation tank 42, and only a micro bubble water supply pipe 43 without a nozzle or branch pipe. 4A is a plan view (top) and a front view (bottom) of a cone-shaped distribution cone 35, and FIG. 4B is a plan view (top) and a front view of an inclined cone-shaped distribution cone 35. Fig. 4C is a plan view (top) and front view (bottom) of an inclined elliptic cone-shaped distribution cone 35, and Fig. 4D is a distribution cone in which the mother line of the inclined elliptical cone is concavely curved. A top view (top) and a front view (bottom) of (35), Figure 4E is a microbubble guide plate 351 toward the microbubble guide plate 33 side of the distribution cone (35) in which the mother line of the inclined elliptic cone is concavely curved. ) Is a plan view (top) and a front view (bottom) of the distribution cone 35 is installed, Figure 4f is a curve of the inclined elliptical cone concave. Top view (top) of the distribution cone 35, the microbubble water guide plate 351 is installed on the microbubble guide plate 33 side of the formed distribution cone 35, the microbubble water obstruction plate 352 is formed on the partition wall 321 and 4G shows a microbubble guide plate 351 on the side of the microbubble guide plate 33 of the distribution cone 35 having a concave curvature of the inclined elliptic cone, and the partition wall 321. The top view of the distribution cone 33 in which the distribution cone hole 353 which becomes wider toward the micro bubble guide plate 33 from the partition 321 is formed in the distribution cone 35 in which the micro bubble water obstruction plate 352 was formed in the side (upper) And a front view (below), and FIG. 5 is a front sectional view in which the lower portion of the partial microbubble contact portion 30 of FIG. 3 is enlarged, and FIG. 6 is an enlarged lower portion of the partial microbubble contact portion 30 of FIG. One is a left side view, Figure 7 is formed on the bottom surface 34 in the microbubble contact portion 30 of the floating sewage sewage treatment apparatus according to an embodiment of the present invention Micropores distribution cone 35 and the micropores catcher supply pipe 43 is a plan view of the portion when seen from the upper contact catcher 30.

8 is a cross-sectional front view of the microbubble complex pump 41 of the flotation type sewage treatment apparatus according to the embodiment of the present invention.

Floating sewage sewage treatment apparatus according to an embodiment of the present invention, the mixing unit 10 to mix the flocculant in the incoming wastewater to generate a floc in the wastewater; Agglomeration unit 20 for growing the floc in the wastewater by stirring and introducing the wastewater that has passed through the mixing unit 10; A microbubble guide plate installed in the water from the bottom to the top of the partition wall 321, the two side partitions (322, 323) and the other side is formed in communication with the lower portion of the condensation portion 20 ( A microbubble contact portion 30 formed surrounded by 33; Microbubble water discharge portion 40 for supplying microbubble water in the bottom direction from the bottom of the microbubble contact portion 30 to the wastewater flowing into the wastewater inlet 31; The waste water flows in contact with an upper portion of the microbubble contacting part 30 together with the floc contacted with the microbubble from the microbubble contacting part 30, and the floc contacted with the microbubble floats on the surface by buoyancy to form a sludge layer. Floating sludge separation tank 50; Floating sludge discharge unit 60 is discharged from the collected sludge installed on the other side of the upper side of the side in communication with the micro-bubble contact portion 30 of the floating sludge separation tank 50 to collect the collected sludge; A float sludge collector 70 installed on the surface of the float sludge separation tank 50 to collect the sludge; A treated water temporary storage tank 80 communicating with a lower portion of the floating sludge separation tank 50 to store treated water from which sludge has been removed; In the floating sewage sewage treatment apparatus comprising a; and a treated water storage tank 90 in communication with the upper portion of the treated water temporary storage tank for storing the treated water,

In the longitudinal direction between the partition wall 321 and the microbubble guide plate 33 on which the wastewater inlet 31 is formed, and the width direction between the two side partitions 322 and 323, the microbubble contact portion 30 is formed. An elliptical cone-shaped distribution cone 35 having a narrow longitudinal direction and a long width direction is formed on the bottom surface 34,

The microbubble water discharge portion 40 is provided with a microbubble water supply pipe 43, characterized in that the microbubble water supply pipe 43 is installed vertically so as to discharge in the direction of the vertex of the distribution cone 35,

There is a difference in the technical configuration from the conventional floating separation sewage treatment apparatus in the microbubble contact portion 30 and the microbubble water discharge portion 40.

Hereinafter, the microbubble contact portion 30 will be described.

The wastewater inlet 31 is a portion which is not blocked by the partition wall 321 from a bottom to a predetermined height so as to communicate with a lower portion of the agglomeration part 20 at the lower portion of the partition wall 321, and the two side partition walls 322. , 323 may be formed on the entire lower portion of the partition wall 321. Alternatively, the wastewater inlet 31 communicating with the lower portion of the agglomeration part 20 in the lower portion of the partition wall 321 to increase the contact of the sewage water flowing from the agglomeration part 20 and the microbubble water supplied through the microbubble water supply pipe 43. ) May be formed to 50 to 100%, preferably 60% or more, and more preferably 70% or more of the total width of the lower portion of the partition wall 321. If the width is too narrow, the floc breakage formed in the flocculation unit 20 or the inflow of the wastewater may be limited, thereby reducing the treatment efficiency.

When the microbubble contact portion 30 is the width direction between the two side partitions (322, 323), the width between the two side partitions (322, 323) is a microbubble guide plate at the wastewater inlet 31 It may be advantageous to increase the contact efficiency of microbubble water and sewage waste in the direction toward (33). At this time, the angle between the partition wall 321 and the side partition wall 322 or 323 may be 10 ° to 50 °, preferably 20 ° to 40 °. If the angle is too narrow, the advantage of improving the contact efficiency of the wastewater may not be sufficiently exhibited. If the angle is too large, the bottom area of the microbubble contact portion 30 may be narrowed, thereby reducing the treatment efficiency, and the same treatment efficiency. In order to achieve this, as the distance between the microbubble guide plate 33 in the partition wall 321 is increased, the installation area can be widened. More preferably, the width between the two side partitions 322 and 323 may be widened at the predetermined angle and then kept constant at the same width as that of the mixing section, the aggregation section or the treatment water reservoir.

In the longitudinal direction between the partition wall 321 and the microbubble guide plate 33 on which the wastewater inlet 31 is formed, and the width direction between the two side partitions 322 and 323, the microbubble contact portion 30 is formed. The ratio of width to length is 1: 0.5 to 1: 2, preferably 1: 0.55 to 1: 1.5, more preferably 1: 0.6 to 1: 1. If the width is too long in the above range, the microbubble discharged from the microbubble water supply pipe 43 does not reach the two side partitions 322 and 323, and thus a dead area is generated in the microbubble contacting part 30, and the length of the microbubble water supply pipe 43 is long. If too long, the pressure that raises the flocs together with the wastewater may be lost, resulting in poor wastewater treatment efficiency.

The virtual line penetrating the center of the microbubble water supply pipe 43 coincides with the virtual line penetrating the vertex of the distribution cone 35 vertically, or the virtual line penetrates the center of the microbubble water supply pipe 43. A line may be installed to move by 5 to 50%, preferably 15 to 45%, more preferably 25 to 40% of the inner diameter of the microbubble water supply pipe 43 in the direction of the microbubble guide plate 33. . When the moving distance in the direction of the micro-bubble guide plate 33 is too short, the number of micro-bubbles discharged toward the partition wall 321 is too high, so that vortices are generated in the wastewater flowing into the wastewater inlet 31 so that the flocs are destroyed. Ascending efficiency may be reduced, and when the moving distance in the direction of the microbubble guide plate 33 is too long, the mixing efficiency of the floc and the microbubble water may be reduced.

The distribution cone 35 is preferably the inclined elliptic cone of FIGS. 4C to 4G rather than the conical shape of FIG. 4A or the inclined cone shape of FIG. 4B.

In the case of a conical shape, when the partition wall 321 in which the wastewater inlet 31 is formed and the microbubble guide plate 33 are in the longitudinal direction, and between the two side partition walls 322 and 323 in the width direction, the length direction and the width are Since the diameters of the directions are the same, the length of the flow path through which the microbubble discharged from the microbubble water supply pipe 43 is guided along the bus line from the vertex of the cone to the bottom surface 34 in the direction of the side partitions 322 and 323 is increased. Since the length of the busbar in the longitudinal direction is also increased, the distribution of the microbubble water in the microbubble contact portion 30, which is relatively wider than the length, may be uneven, so that an elliptic cone shape having a long width direction and a short longitudinal direction is formed. desirable.

Also, even in the case of an elliptical cone having the same long radius, short radius, and height, it is preferable that the vertex of the elliptical cone is an inclined elliptical cone oriented toward the partition wall 321. The inclination degree is 20 to 95, preferably 40 to 90, more preferably, when the position of the vertex is 100, the length of the long radius in the direction of the partition 321 at the vertex when not inclined. Preferably to form a vertex in the 60 to 85 position. If the inclination degree is less than the above range, the length of the flow path through which the microbubble water discharged from the microbubble water supply pipe 43 is guided along the bus line from the vertex to the bottom surface 34 in the direction of the microbubble water guide plate 33 becomes shorter and at the same time. When the slope is steep, the efficiency of wastewater treatment by agglomeration of microbubbles decreases, and when the degree of inclination exceeds the above range, the number of fine bubbles discharged from the distribution cone 35 toward the wastewater inlet 31 becomes relatively large. Interfering with the flow of sewage and floc can reduce floc ascending efficiency and wastewater treatment efficiency.

The ratio of the short radius to the long radius of the elliptic cone bottom ellipse is 1: 1.5 to 1: 4, preferably 1: 1.8 to 1: 3.8, and more preferably 1: 2 to 1: 3.5. If the long radius is too small in the above range, the length of the flow path through which the microbubble water discharged from the microbubble water supply pipe 43 is guided along the mother wire from the vertex to the bottom surface 34 in the direction of the side partition walls 322 and 323 becomes short. If the long radius is too large in the range, it is distributed in the direction of the side bulkheads 322 and 323 and the flow of the microbubble water striking the side bulkheads 322 and 323 becomes strong, thereby causing agglomeration of the microbubbles, thereby reducing the wastewater treatment efficiency. .

The slope of the bus bar of the distribution cone 35 becomes smoother from the vertex toward the bottom surface 34, preferably the angle of the tangent of the bus bar located at the vertex is 60 ° to 90 °, preferably 70 ° to 85 °. °, the tangential angle of the bus bar in contact with the bottom surface is 0 ° to 50 °, the tangent of the bus bar in the direction of the partition wall 321 is also 25 ° to 50 °, preferably 30 ° to 45 ° in the bus bar in contact with the bottom surface. The tangent of the bus bar in the direction of the microbubble guide plate 33 is 0 ° to 35 °, preferably 10 ° to 25 °. As described above, the distribution cone having a concave curved cross section of the bus bar may bring the flow of the microbubble water to the bottom surface 34 while minimizing the aggregation caused by the collision of the microbubble water.

The corner of the microbubble contact portion 30 is formed on the side of the microbubble guide plate 33 of the distribution cone 35 along the bus bar in the direction from the vertex to the bottom surface 34. It is advantageous to evenly distribute the microbubble water radially. The microbubble water guide plate 321 may be formed perpendicularly to the contact surface of the busbar from the vertex to the bottom surface 34 along the busbar or to a predetermined point therebetween, and the height of the microbubble water guide plate 321 may be microbubble water. When the inner diameter of the supply pipe 43 is 100, it is formed in the height of 20-100, Preferably it is 30-90, More preferably, it is about 40-80.

Installing a plurality of microbubble water obstruction plates 352 perpendicular to the bus bar on the side of the partition wall 321 of the distribution cone 35 is partially discharged from the microbubble water supply pipe 43 toward the wastewater inlet 31. It is preferable to distribute the microbubble water in the direction of the side partitions 322 and 323 to prevent vortices of incoming wastewater and to maintain a floc. The microbubble baffle plate may be installed to be perpendicular to the bus bar, but may be formed to be inclined at 15 ° to 45 ° from both sides downward with respect to the center. The height of the microbubble baffle plate 322 is 10 to 60, preferably 15 to 50, more preferably 20 to 40 when the inner diameter of the microbubble water supply pipe 43 is 100.

Since the distribution cone hole 353 is formed on the side surface of the partition wall 321 of the distribution cone 35 toward the microbubble guide plate 33, the flow of sewage and floc by the distribution cone 35 formed long in the width direction. Can be made smooth in the longitudinal direction. The distribution cone hole 353 is formed at the side surface of the partition wall 321 so as to gradually widen in the direction of the microbubble guide plate 33 at the partition wall 321, and the entrance of the distribution cone hole 353 is at the side surface of the microbubble guide plate 33. Compared to the exit of the formed distribution cone hole 353, at least one of its width and height is formed smaller. More preferably, the lower end of the inlet or outlet of the distribution cone hole 353 is formed in contact with or very close to the bottom surface 34, and the width and height of the distribution cone hole 353 are increased gradually from the inlet to the outlet.

When the end position of the microbubble water supply pipe 43 is the center of the width direction, the length from the partition wall 321 in which the wastewater inlet 31 is formed to the microbubble guide plate 33 in the longitudinal direction is 100, The imaginary line passing through the center of the microbubble water supply pipe 43 is 10 to 30 positions, preferably 15 to 25 positions, and when the height of the wastewater inlet 31 is 100, the distribution cone 35 The height is 80 to 100, preferably 85 to 95, and when the height of the distribution cone 35 is 100, the height from the bottom of the distal end of the microbubble water supply pipe 43 is 100 to 120, preferably 105 To 115.

The height of the wastewater inlet 31 is 300 to 800 mm, the height of the distribution cone 35 is 250 to 750 mm, the terminal height of the microbubble water supply pipe 43 is 300 to 900 mm in height from the bottom surface 34 In this case, the height of the partition walls 321, 322, 323 from the bottom may be about 2 to 4.5 m.

The micro-bubble guide plate 33 may be formed to be inclined 30 ° to 60 °, preferably 40 ° to 55 ° from the bottom. In addition, the micro-bubble guide plate 33 may be formed at a constant angle from the bottom to the end, preferably in the above range the angle of the bottom portion is relatively high, the angle of the end portion may be formed relatively low, It may be formed in a curved shape within the above range. In the case of the microbubble water discharge part 44 of FIG. 2, which has a branch pipe and a plurality of nozzles formed on a large area of the bottom of the conventional microbubble contact part 30, the wastewater and the upper part of the microbubble contact part 30 are upwards through the nozzle. Since the floc is raised, even when the inclination of the microbubble guide plate 33 exceeds 60 ° or is vertically formed, the floc can be easily raised. However, in the case of the present invention, the number of microbubbles discharged in the bottom direction is fine. It is necessary to lower the angle below the upper limit so that the floc can be raised while easily riding the guide plate 33. However, if the angle of the microbubble guide plate 33 is too low, the distance to the surface may be too long, and thus the rise of the floc may be difficult.

The height of the microbubble guide plate 33 is preferably 50 to 70% of the height of the wastewater of the microbubble contact portion 30.

Hereinafter, the micro bubble water discharge unit 40 will be described.

The microbubble water discharge part 40 is an inlet 411 through which the treated water and air are supplied, a splitter 412 through which the treated water and the air extending downward from the inlet 411 flow, and the powder The rotating grid 413 provided in the installment part 412 and divided by mixing and dividing the treated water and air into a split plate 4131 spaced at a predetermined interval while rotating, and from the divided part 412. It extends upwards, the inner space (4143) formed by increasing and decreasing the diameter toward the upper side, the discharge port (4141) formed in the distal end portion of the diameter of the inner space (4143) is reduced, and downward around the outlet (4141) A microbubble complex pump 41 including a discharge part 414 including a protruding blocking plate 4142;

The mixed water supply pipe 421 to which the mixed water of the microbubble water and the agglomerated bubble water discharged from the discharge port 4141 of the microbubble water composite pump 41 is supplied, and the pressure control valve 422 and the excess pressure air discharge pipe 423. The pressure excess air separation tank 42 is provided; And

It includes; and the microbubble water supply pipe 43 for discharging the microbubble water of a predetermined pressure and less than a predetermined size from the pressure excess air separation tank 42.

Air in the inlet 411 may be introduced together by the suction pressure of the treated water through the air inlet pipe (4111). Furthermore, in order to more effectively introduce the air, an air inlet pipe 4112 may be installed from the air inlet pipe to the inlet of the splitter 412.

The micro-bubble water composite pump 41 sucks the treated water and air into the partition 412 having a narrower flow path than the inlet 411 by the rotation of the rotary grid 413 having the partition plate 4131. The water and the air are divided while mixing, and the resulting microbubble water is transferred to the discharge part 414 at high pressure.

The micro-bubble water generated by the micro-bubble water composite pump 41 has a microbubble of less than a predetermined size and microbubbles of a predetermined size or more separated through the discharge part 414 having an internal space 4143 and a blocking plate 4414, respectively. After passing through the flow path and discharged together to the discharge port 4141, the air exceeding a predetermined pressure by the pressure control valve 422 in the pressure excess air separation tank 42 is discharged to the gas phase, the treated water below a predetermined pressure Only the microbubble water dissolved in is discharged through the microbubble water supply pipe 43. In this case, since the microbubble water supply pipe 43 does not additionally include a separate branch pipe or a plurality of nozzles, the microbubble water may be supplied into the water without agglomeration or pressure loss of the microbubbles.

The inner space 4143 of the discharge part 414 extends upward from the dividing part 412 and is formed by increasing and decreasing the diameter toward the upper part, and the inner surface of the discharge part 414 forms a curved surface, and is preferably spherical. The treatment water and the air are mixed by the rotation of the partition plate 4131 and the rotating grid 413, and when the microbubbles generated are discharged into the internal space 4143, the microbubbles of a predetermined size or more are subjected to centrifugal force. 7 is discharged to the rotational direction of the rotary grating 413, that is, to the left hemisphere of FIG. 7 and moves along an inner wall of the inner space 4143 to rotate and agglomerate with each other while colliding with the blocking plate 4142, and less than a predetermined size. The microbubbles are discharged from the dividing unit 412, move through the central portion of the internal space 4143, and are discharged to the discharge port 4141. Therefore, the microbubble water discharged from the dividing unit 412 moves through the flow paths separated from the internal space 4143 of the discharge unit 414 according to the size of the microbubbles, and is discharged together with the discharge port 4141. That is, the microbubble water discharged to the discharge port 4141 is discharged together with the microbubble having a predetermined size smaller than the predetermined size moving to the center of the internal space 4143 and the microbubble having a predetermined size or more that is increased by agglomeration while rotating to the inner wall of the internal space 4143. do.

The height of the blocking plate 4142 is 5 to 40%, preferably 10 to 30% of the diameter of the spherical inner space 4143. If the height of the blocking plate 4422 is too low, the inner wall of the inner space 4143 may be discharged together with a microbubble having a predetermined size moving to the center portion before being sufficiently aggregated. If the height of the blocking plate (4142) is too high, the amount of the fine bubbles aggregated more than a predetermined size is relatively too large while rotating the inner wall of the internal space (4143) fine less than the predetermined size of the fine bubble water composite pump 41 Microbubble generation efficiency and power consumption saving effect is reduced.

The height of the blocking plate (4142) is a truncated cylindrical shape having a high height in the rotational direction of the rotational grid 413, low in the opposite direction, the efficiency of generating micro bubbles and power requirements for generating micro bubbles of less than a predetermined size It is more desirable to increase the savings.

The diameter of the spherical inner space (4143) is 3 to 6 times, preferably 4 to 5.5 times the inner diameter of the flow path of the divided portion 412 formed around the rotary grating 413, the fine bubbles if out of the range The microbubble generation efficiency and power consumption saving effect is reduced.

The flow path inner diameter of the inflow portion 411 is 2 to 4 times, preferably 2.5 to 3.5 times the inner diameter of the flow path of the divided portion 412 formed around the rotary grating 413, the microbubble complex below the lower limit There is a limit in increasing the discharge pressure of the microbubble water discharged from the pump 41, and if the upper limit is exceeded, a load may be generated in the pump to increase the size or capacity of the pump.

Treated water is supplied to the inlet 411 of the microbubble complex pump 41 at a pressure of 0.1 to 0.6 bar, preferably 0.2 to 0.5 bar, and the air is 3 to 10% of the inflow flow rate. Preferably it is suctioned at 7.5 to 8.5%, the rotational speed of the rotary grating 413 is 40 to 60 Hz, preferably 50 to 60 Hz, if out of the range is discharged from the microbubble complex pump 41 There is a limit in increasing the discharge pressure of the microbubble water, and it is difficult to adjust the pressure discharged from the microbubble water composite pump 41 to 2 to 6 bar, preferably 3 to 5 bar.

The pressure control valve 422 of the pressure excess air separation tank 42 may be set to 2 to 6 bar, preferably 3 to 5 bar. Since the microbubble water supply pipe 43 of the present invention is discharged directly to the microbubble contact portion 30 without pressure loss through a branch pipe or a plurality of nozzles, the pressure set in the pressure control valve 422 of the pressure excess air separation tank 42 is It is substantially the same as the pressure discharged from the microbubble water supply pipe 43.

The microbubble water supply pipe 43 supplies the microbubble water from the lower portion of the microbubble contact portion 30 to the bottom of the wastewater introduced into the wastewater inlet 31. The microbubble water supply pipe 43 is a pipe for supplying the microbubble water in the bottom direction without installing a separate branch pipe or a plurality of nozzles in the microbubble contact portion 30.

On the other hand, the bottom of the floating sludge discharge unit 60 may be inclined to the bottom surface while going in the direction of the temporary storage tank 80 in the microbubble guide plate 33. The inclination is preferably 2 ° to 5 °. In the floating sludge separation tank 50 and the treated water temporary storage tank 80, the settling sludge blocking wall 81 is installed at a height of 5 to 30% of the height of the partition wall 321 perpendicularly to the bottom surface so that it partially settles after the injury. It is advantageous to block the inflow of sludge.

The present invention will be described in more detail with reference to the following Examples. However, these examples are intended to illustrate the present invention in more trajectory, and it will be apparent to those skilled in the art that the scope of the present invention is not limited thereto.

Example 1

Referring to the plan view of the microbubble contact 30 of FIG. 7, the ratio of the width and the length of the microbubble contact 30 is 1: 1.3, width 2.4 m, length 3.2 m, height 2.2 m, and the wastewater inlet 31. The height is 0.4 m, the width is 2.4 m, the angle of the microbubble guide plate 33 is 60 °, the microbubble complex pump 41 shown in FIG. An air separation tank 42; And a microbubble discharge part 40 composed of a microbubble water supply pipe 43. The height of the wastewater of the microbubble contact portion 30 was 2.1 m.

The treated water is supplied to the inlet 411 of the microbubble water complex pump 41 at 125 L / min suction at a pressure of 0.4 bar, the air is sucked at 10 L / min, and the rotation of the rotary grating 413 is performed. The number is 60 Hz, the pressure control valve 422 of the pressure excess air separation tank 42 is set to 4 bar, so that the microbubble water of 4 bar to the microbubble water supply pipe 43 is discharged.

In addition, the micro-bubble discharge pipe 43 has an inner diameter of 40 mm, 0.6 m in the direction of the micro-bubble guide plate 33 in the partition wall 321, was installed in the bottom direction perpendicular to the height 0.41 m from the bottom.

Further, the distribution cone 35 has a height of 0.4 m, a long radius of 1.0 m, a short radius of 0.4 m, and a vertex of 0.3 in the short radius direction of the partition wall 321 at the virtual vertex when the elliptical cone is not tilted. m installed inclined to be in the moved position.

In addition, the virtual center line of the microbubble discharge pipe 43 is installed to move in the direction of the 15 mm microbubble guide plate 33 from the vertex of the distribution cone (35).

Example 2

In the same manner as in Example 1, the microbubble contact portion 30 is formed, except that the distribution cone 35 has a height of 0.4 m, a long radius of 1.0 m, a short radius of 0.4 m, and an elliptical cone inclined at an apex. When it is not, tilt the virtual vertex to be at a position moved 0.3 m in the short radius direction toward the partition wall 321, and the microbubble guide plate 351 radially toward the microbubble guide plate 33 at a height of 30 mm. It was installed perpendicular to the contact surface.

The inclination of the tangential line of the vertex of the distribution cone 35 was 80 degrees, the inclination of the bus bar in contact with the bottom surface 34 was 20 ° toward the microbubble guide plate 33 side, 45 ° toward the partition wall 321.

Example 3

In the same manner as in Example 1, the microbubble contact 30 is formed, except that the distribution cone 35 has a height of 0.4 m, a long radius of 1.0 m, a short radius of 0.4 m, and an elliptical cone inclined at an apex. When it is not, tilt the virtual vertex to be at a position moved 0.3 m in the short radius direction toward the partition wall 321, and the microbubble guide plate 351 radially toward the microbubble guide plate 33 at a height of 30 mm. It was installed perpendicular to the contact surface.

The inclination of the tangential line of the vertex of the distribution cone 35 was 80 degrees, the inclination of the bus bar in contact with the bottom surface 34 was 20 ° toward the microbubble guide plate 33 side, 45 ° toward the partition wall 321.

The lower end of the inlet formed on the partition wall 321 side of the distribution cone 35 is in contact with the bottom surface 34, the height is 0.1 m, the width is 0.3 m, the lower end of the outlet formed on the microbubble guide plate 33 is the bottom surface 34 ), The height was 0.18 m and the width was 0.6 m.

Comparative Example 1

The microbubble contact portion 30 is configured in the same manner as in the second embodiment, but the microbubble water discharged from the microbubble supply pipe 43 is directly installed on the bottom surface 34 because the distribution cone 35 is not installed on the bottom surface 34. To be discharged.

Comparative Example 2

In the same manner as in Example 1, the microbubble contact portion 30 is configured, but the distribution cone 35 has a height of 0.4 m and a radius of 0.4 m in the shape of FIG. 4B, and the vertex is at an imaginary vertex when the cone is not inclined. It was installed inclined so as to be in a position moved 0.3 m in the direction of the partition 321.

In addition, the virtual center line of the microbubble discharge pipe 43 is installed so that the center of the vertex of the distribution cone (35).

Comparative Example 3

In the same manner as in Example 1, the microbubble contact portion 30 is configured, but the distribution cone 35 has a height of 0.4 m and a radius of 0.8 m in the shape of FIG. 4B, and the vertex is at an imaginary vertex when the cone is not inclined. It was installed inclined so as to be in a 0.3 m position in the direction of the partition 321.

In addition, the virtual center line of the microbubble discharge pipe 43 is installed so that the center of the vertex of the distribution cone (35).

Comparative Example 4

A compressor 443 for supplying compressed air to a pressure separation pump 442 and a pressurized treated water conveying pipe as shown in FIG. 1 to a floating separation type sewage treatment apparatus having a microbubble contact portion 30 having the same specification as that of the first embodiment. A line mixer 444 for mixing the pressurized treated water and compressed air, a pressurized tank 445 for dissolving air by pressurizing the mixed water of the pressurized processed water and compressed air, and the microbubble contact portion 30 in the pressurized tank. A predetermined distance to the mixed water supply pipe 446 for conveying the pressurized treated water and the mixed water of the compressed air to the lower part of the center), two branch pipes 4451 and 4462 branched from the mixed water supply pipe, and the two branch pipes, respectively. As a result, the microbubble discharge portion 44 including the microbubble water supply nozzles 4446 and 4464 was installed at a height of 0.1 m from the bottom.

Experimental Example 1: Microbubble average diameter and average number of bubbles

In the floating separation sewage treatment apparatus of Examples 1 to 4 and Comparative Examples 1 to 4, the upper surface of both edges of the partition wall 321 of the microbubble contact portion, the microbubble diameter of the upper surface of the edge of both edges of the distal end of the microbubble guide plate 33 and The amount of bubbles was measured, respectively, and their average is shown in Table 1 below.

division Average diameter (㎛) Average number of bubbles (pieces / ml) Example 1 24 3,105 Example 2 23 3,412 Example 3 20 4,455 Comparative Example 1 28 1,912 Comparative Example 2 27 2,323 Comparative Example 3 30 1,820 Comparative Example 4 30 2,340

Experimental Example 2: Sewage Wastewater Treatment Efficiency

The treatment efficiency of the wastewater was compared using the floating sewage sewage treatment apparatus of Examples 1 to 4 and Comparative Examples 1 to 4. The total phosphorus (T-P) of the incoming wastewater was 0.807 mg / L and the suspended solids was 4.4 mg / L. The wastewater treatment efficiency is shown in Table 2 below as a percentage of the total phosphorus or suspended solids of the incoming wastewater and the total phosphorus or suspended solids in the treated water that passed through the wastewater treatment system.

division Total Processing Efficiency (%) Suspended matter treatment efficiency (%) Example 1 86 42 Example 2 88 49 Example 3 92 68 Comparative Example 1 80 19 Comparative Example 2 83 28 Comparative Example 3 79 11 Comparative Example 4 79 8

Experimental Example 3: Power Consumption

Using the flotation type sewage treatment system of Examples 1 to 4 and Comparative Examples 1 to 4, the average daily power consumption was calculated for 7 days, and the average daily power consumption was calculated.

division Average daily power consumption (kWh) Example 1 90 Example 2 80 Example 3 80 Comparative Example 1 100 Comparative Example 2 100 Comparative Example 3 100 Comparative Example 4 150

10: mixing section 11: rapid stirrer
20: flocculation part 21: first flocculation tank 211: slow stirrer
22: second flocculation tank
30: microbubble contact portion 31: wastewater inlet 321: partition
322, 323: side bulkhead 33: microbubble guide plate 34: bottom surface
35: distribution cone 351: microbubble water guide plate 352: microbubble water obstruction plate
353: distribution cone hole
40, 44: microbubble discharge part
41: microbubble complex pump 411: inlet
4111: air inlet pipe 4112: air inlet pipe
412: divider 413: rotary grid 4131: the divider
414: outlet 4141: outlet 4142: blocking plate
4143: interior space
42: pressure excess air separation tank 421: mixed water supply pipe
422: pressure control valve 423: pressure excess air discharge pipe
43: fine bubble water supply pipe
441 inlet pipe 442 pressure pump 443 compressor
444: line mixer 445: pressurized tank 446: mixed water supply pipe
4461, 4462: branch pipe 4463, 4464: nozzle
50: floating sludge separation tank
60: floating sludge discharge
70: Sludge Sludge Collector
80: treated water temporary storage 81: sedimented sludge barrier wall
90: treated water reservoir

Claims (5)

A mixing unit 10 for mixing flocculant with the introduced wastewater to generate flocs in the wastewater; Agglomeration unit 20 for growing the floc in the wastewater by stirring and introducing the wastewater that has passed through the mixing unit 10; A microbubble guide plate installed in the water from the bottom to the top of the partition wall 321, the two side partitions (322, 323) and the other side is formed in communication with the lower portion of the condensation portion 20 ( A microbubble contact portion 30 formed surrounded by 33; Microbubble water discharge portion 40 for supplying microbubble water in the bottom direction from the bottom of the microbubble contact portion 30 to the wastewater flowing into the wastewater inlet 31; The waste water flows in contact with an upper portion of the microbubble contacting part 30 together with the floc contacted with the microbubble from the microbubble contacting part 30, and the floc contacted with the microbubble floats on the surface by buoyancy to form a sludge layer. Floating sludge separation tank 50; Floating sludge discharge unit 60 is discharged from the collected sludge installed on the other side of the upper side of the side in communication with the micro-bubble contact portion 30 of the floating sludge separation tank 50 to collect the collected sludge; A float sludge collector 70 installed on the surface of the float sludge separation tank 50 to collect the sludge; A treated water temporary storage tank 80 communicating with a lower portion of the floating sludge separation tank 50 to store treated water from which sludge has been removed; In the floating sewage sewage treatment apparatus comprising a; and a treated water storage tank 90 in communication with the upper portion of the treated water temporary storage tank for storing the treated water,
In the longitudinal direction between the partition wall 321 and the microbubble guide plate 33 on which the wastewater inlet 31 is formed, and the width direction between the two side partitions 322 and 323, the microbubble contact portion 30 is formed. An elliptical cone-shaped distribution cone 35 having a narrow longitudinal direction and a long width direction is formed on the bottom surface 34,
The microbubble water discharge unit 40 is provided with a microbubble water supply pipe 43, is installed vertically so that the microbubble water supply pipe 43 is discharged in the direction of the vertex of the distribution cone 35,
In the longitudinal direction between the partition wall 321 and the microbubble guide plate 33 on which the wastewater inlet 31 is formed, and the width direction between the two side partitions 322 and 323, the microbubble contact portion 30 is formed. The ratio of width to length is 1: 0.5 to 1: 2,
The distribution cone hole 353 is formed at the side surface of the partition wall 321 of the distribution cone 35 toward the microbubble guide plate 33.
The fine bubble water discharge portion 40,
An inlet 411 through which the treated water and air are supplied;
The splitter 412 through which the treated water and air flowing downward from the inlet 411 flow.
The rotating grid 413 which is provided in the dividing unit 412 and rotates while separating the treated water and air into the dividing plate 4131 spaced at a predetermined interval while rotating to form fine bubble water, and
An inner space 4143 extending upward from the dividing portion 412 and increasing and decreasing in diameter toward the upper portion, an outlet 4414 formed at a distal end portion of which the diameter of the inner space 4143 is reduced, and the outlet A microbubble complex pump 41 including; a discharge part 414 including a blocker plate 4414 protruding downwardly about the periphery;
The mixed water supply pipe 421 to which the mixed water of the microbubble water and the agglomerated bubble water discharged from the discharge port 4141 of the microbubble water composite pump 41 is supplied, and the pressure control valve 422 and the excess pressure air discharge pipe 423. The pressure excess air separation tank 42 is provided; And
Floating sewage sewage treatment apparatus comprising a; microbubble water supply pipe (43) for discharging the microbubble water of a predetermined pressure and less than a predetermined size from the pressure excess air separation tank (42). The method of claim 1,
Floating sewage sewage treatment apparatus, characterized in that the inner space (4143) of the discharge portion (414) is spherical. The method of claim 2,
The discharge unit 414,
Micro-bubbles of a predetermined size or more move along the inner wall of the internal space 4143 by centrifugal force and agglomerate with each other while colliding with the blocking plate 4422,
Floating sewage treatment apparatus, characterized in that the fine bubbles of less than a predetermined size is discharged from the dividing portion (412) to move through the central portion of the internal space (4143) and discharged to the discharge port (4141). The method according to any one of claims 1 to 3,
Treated water is supplied to the inlet 411 by suction at a pressure of 0.1 to 0.6 bar,
The air is sucked at 3 to 10% of the inlet flow rate,
Floating separation type wastewater treatment apparatus, characterized in that the rotational speed of the rotary grid (413) is 40 to 60 Hz. The method of claim 4, wherein
Floating type sewage treatment apparatus, characterized in that the pressure control valve 422 of the pressure excess air separation tank 42 is set to 2 to 6 bar.

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