KR101997704B1 - Dissolved air flotation type wastewater processing apparatus equipped with microbubble contacting part equipped with concave groove wall and varied width of wastewater inlet - Google Patents

Abstract

The present invention is to provide a dissolved air flotation type wastewater treatment apparatus having a microbubble contact part having a partition wall formed with a concave groove and varied width of wastewater inlet. The apparatus does not use high power consumption devices such as pressurizing pumps, compressors, and pressurizing tanks, as well as branch and/or multiple nozzles which cause pressure loss and coagulation of microbubbles, and supplies the microbubble water to the microbubble contact part without pressure loss and coagulation of microbubbles and brings a uniform distribution of the microbubbles in the microbubble contact part, thereby having low maintenance cost according to the installation cost and power requirements.

Description

Dissolved air flotation type wastewater processing apparatus equipped with microbubble contacting part equipped with concave groove wall and varied width of wastewater inlet}

The present invention relates to a sewage treatment apparatus, in particular a floating sewage treatment apparatus having a micro-bubble contact portion having a partition wall having a concave groove formed therein with a controlled width of the wastewater inlet.

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 does not use a high power consumption accessory such as a pressure pump, a compressor and a pressurized tank, as well as a branch pipe and / or a plurality of nozzles, which cause pressure loss and agglomeration of micro bubbles, and the pressure loss through the micro bubble water supply pipe. By supplying the microbubble water to the microbubble contact without agglomeration of the microbubbles, bringing a uniform distribution of the microbubble in the microbubble contact portion, the partition wall having a concave groove formed with a controlled width of the wastewater inlet, which has a low maintenance cost according to the installation cost and power consumption To provide a floating separation sewage treatment apparatus having a microbubble contact portion provided.

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,

The partition 321 is formed with a concave groove between the wastewater inlet 31 from the terminal height of the fine bubble water supply pipe 43,

The microbubble water discharge unit 40 is provided with a microbubble water supply pipe 43, and the microbubble water supply pipe 43 relates to a floating separation sewage treatment apparatus, characterized in that installed inclined in the concave groove direction.

The present invention does not use a high power consumption accessory such as a pressure pump, a compressor and a pressurized tank, as well as a branch pipe and / or a plurality of nozzles, which cause pressure loss and agglomeration of micro bubbles, and the pressure loss through the micro bubble water supply pipe. By supplying the microbubble water to the microbubble contact without agglomeration of the microbubbles, the uniform distribution of the microbubble in the microbubble contact is achieved, so that the width of the wastewater inlet with low maintenance cost according to the installation cost and power consumption is controlled, and the partition wall having the concave groove is formed. It is possible to provide a floating separation sewage treatment apparatus having a microbubble contact portion provided.

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.
4 is an enlarged cross-sectional front view of the lower portion of the A-microbubble contact portion 30 of FIG.
5 is a perspective view of a partition and a microbubble water supply pipe portion in which a wastewater inlet is installed at a portion of a partition wall and a radial groove is formed on the microbubble contact portion of the floating sewage wastewater treatment apparatus according to an embodiment of the present invention.
FIG. 6 is a front view of the perspective view of FIG. 5 when looking at the partition wall direction from the microbubble guide plate. FIG.
Figure 7 is a front sectional view of the microbubble complex pump of the floating separation 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 7.

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. 4 is an enlarged front sectional view of a lower portion of the A part microbubble contact portion 30 of FIG. 3, and FIG. 5 is a microbubble contact portion of the flotation type sewage treatment apparatus according to an embodiment of the present invention. 30 is a perspective view of a portion of the partition wall 321 and the microbubble water supply pipe 43 in which the wastewater inlet 31 is installed in a part of the partition wall 321 and a radial groove 3211 is formed thereon, and FIG. A perspective view of the microbubble guide plate 33 when viewed from the direction of the partition wall 321.

In addition, Figure 7 is a front sectional view of the microbubble complex pump 41 of the floating sewage sewage treatment apparatus according to an 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; And a treatment water storage tank 90 communicating with an upper portion of the treatment water temporary storage tank to store the treatment water.

The partition 321 is formed with a concave groove between the wastewater inlet 31 from the terminal height of the fine bubble water supply pipe 43,

The microbubble water discharge unit 40 is provided with a microbubble water supply pipe 43, characterized in that the microbubble water supply pipe 43 is installed to be inclined in the concave groove direction, microbubble with the conventional floating separation sewage treatment apparatus There is a major difference in the technical configuration of the 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. ) 20 to 100%, preferably 30 to 80%, more preferably 40 to 60% 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. If the width is too wide, the microbubble water and the wastewater inlet are supplied to the microbubble water supply pipe 43. Contact of the sewage with the floc which flows into 31 may not be made sufficiently.

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: 1.2 to 1: 3, preferably 1: 1.5 to 1: 2.5. When the width is too wide 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 is in the above range If too long, the pressure that raises the flocs together with the wastewater may be lost, resulting in poor wastewater treatment efficiency.

An imaginary line passing through the center of the microbubble water supply pipe 43 may be installed to be inclined from 10 ° to 30 °, preferably 15 ° to 25 ° with a vertical line. That is, θ2 in FIG. 4 is 10 ° to 30 °, preferably 15 ° to 25 °. If the angle is too small, the flow of water in the opposite direction to the inflow of the wastewater by the microbubble discharged vertically in the bottom direction may cause a vortex in the bottom portion and increase the rate of floc destruction. In addition, when the angle is too large, the rate at which the microbubble hits the concave groove is relatively high, thereby increasing the floc's rising efficiency due to mutual coagulation or pressure loss of the microbubble water.

When the distance from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31 is about 100 to 60, preferably in the direction from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31, The depth of the concave groove becomes deeper to the position of about 65 to 80, and then the depth of the groove becomes shallow again, thereby minimizing the pressure loss of the micro bubble water discharged from the microbubble supply pipe 43 and efficiently contacting the microbubble water with the floc. desirable.

The concave groove is a radial groove 3211 extending in the direction of the wastewater inlet 31 at the end height position of the microbubble water supply pipe 43, and the microbubble water discharged in a narrow cross section through the microbubble water supply pipe 43 is provided. It is desirable to widen the portion in contact with the relatively very wide wastewater inlet 31.

It is preferable that the depth of the radial groove 3211 is the deepest in the vertical center line in the vertical direction and the depth becomes lower toward the periphery thereof. At this time, as shown in Figure 6, the length of the c line passing through the center in the bottom direction from the end of the microbubble water supply pipe 43 of the radial groove, a line passing through the edge of the radial groove 3211 and b line passing therebetween In the case of setting substantially the same, the a line should be deeply formed in the groove, the c line may be the shallow groove, and the b line may be the middle groove. At this time, the microbubble water discharged from the microbubble water supply pipe 43 is discharged radially at the same pressure and travels about the same distance to reach the upper end of the wastewater inlet 31 at about the same time, so that it contacts the floc flowing into the wastewater inlet evenly. You can do it.

The cross-section in which the radial grooves 3211 are formed in the partition wall 321 has a distance from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31 at 100 from the end height position of the microbubble water supply pipe 43. 60 to 90, preferably 65 to 80 in the direction of the wastewater inlet 31 is a straight line inclined 5 ° to 30 °, preferably 10 ° to 25 ° with respect to the vertical line, in the direction of the wastewater inlet 31 It is preferable that it is formed in circular arc while going.

The radial groove 3211 has a distance from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31 as the direction of the wastewater inlet 31 from the end height position of the microbubble water supply pipe 43. A plurality of microbubble water guide plates 3212 protruding radially to distribute the microbubble water at a position of about 50 to 50 are preferably provided to evenly distribute the microbubble water. The length of the microbubble water guide plate 3212 is 10 to 30, preferably 15 to 25 when the distance from the height position of the microbubble water supply pipe 43 to the wastewater inlet 31 is 100, and the microbubble water The height of the guide plate 3212 may be equal to the depth of the concave groove, and may be installed to protrude 10 to 50% higher than the depth of the concave groove, if necessary. The microbubble water guide plate 3212 may be provided in a triangular shape such that the height increases as the depth of the radial groove 3211 increases.

The imaginary tangent of the end of the arc at the section in contact with the wastewater inlet 31 of the radial groove 3211 is 5 ° to 45 °, preferably 15 ° to 40 ° with the bottom surface of the microbubble contact 30. To be formed, the flow of the microbubble is inclined in the bottom direction is easily formed to contact the wastewater flowing into the wastewater inlet 31 to raise the floc.

The angle of the radial groove 3211 is inclined 2 ° to 10 ° more than the angle between the imaginary line passing through the center of the microbubble water supply pipe 43 and the vertical line, that is, θ2 of FIG. 4 is compared with θ1. A further inclination of 2 ° to 10 ° may reduce the pressure loss of the microbubble water.

The height of the wastewater inlet 31 is 300 to 800 mm, and the end of the microbubble water supply pipe 43 is provided at an upper portion of the wastewater inlet 31 at 200 to 600 mm, wherein the bottom walls 321, 322 and 323 may have a height of 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 portion 414 extends upward from the dividing portion 412 and is formed to increase in diameter and decrease toward the upper portion, and the inner surface of the discharge portion 414 has 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 drawings of the microbubble contact portion 30 of FIGS. 3 to 6, the ratio of the width and the length of the microbubble contact portion 30 is 1: 3, and is 1.8 m wide, 4.2 m long and 2.2 m high, and the wastewater inlet. The 31 is installed at the center of the partition wall 321, and the width is 0.9 m and the height is 0.4 m, and the angle of the microbubble guide plate 33 is 60 ° from the bottom to the middle, and 45 ° from the middle, and the height is 1.4. m the microbubble water composite pump 41, the pressure excess air separation tank 42 shown in Figure 7 in the microbubble contact portion 30; And a microbubble discharge part 40 composed of a microbubble water supply pipe 43.

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 end of the micro-bubble supply pipe 43 is installed to be tilted 20 ° in a vertical line at a height of 0.85 m from the bottom 10 cm apart from the partition wall 321, the center of the radial groove 3211 is a vertical line up to a height of 0.55 m from the bottom Deepens to 25 ° incline, becomes shallow again by drawing an arc to the top of the wastewater inlet 31, and becomes shallower toward the periphery of the radial groove 3211, and the tangential tangential of the end of the arc is the microbubble contact 30. It was installed to be 30 ° and the bottom surface of.

Example 2

The microbubble contact portion 30 is configured in the same manner as in Example 1, except that the five microbubble water guide plates 52 are radially installed in the radial grooves 3211, and the microbubble water guide plate 52 is 0.82 from the bottom. It was installed in a triangular shape about 1 cm lower than the depth of the concave groove from m to 0.7 m height.

Example 3

The microbubble contact portion 30 is configured in the same manner as in Example 1, except that the width between the two side partitions 322 and 323 in contact with the left and right side ends of the wastewater inlet is 45 ° at an angle of 45 °. When the width between the two side bulkheads 322 and 323 became 1.8 m, the width was made constant.

Example 4

The microbubble contact portion 30 is configured in the same manner as in Example 1, except that the imaginary tangent at the end of the arc is horizontal to the bottom surface of the microbubble contact portion 30.

Example 5

The microbubble contact portion 30 is configured in the same manner as in Example 1, except that the width of the wastewater inlet 31 is 1.8 m.

Comparative Example 1

The microbubble contact portion 30 is configured in the same manner as in the first embodiment, except that the radial groove 3211 is not formed in the partition wall 321 and the microbubble supply pipe 43 is vertically formed in the microbubble guide plate 33 in the partition wall 321. In the vertical direction so that the distal end position is 1 m and the height is 0.4 m from the bottom.

Comparative Example 2

The microbubble contact portion 30 is configured in the same manner as in Comparative Example 1, except that the microbubble supply pipe 43 vertically has a distal end position of 0.5 m in the direction of the microbubble guide plate 33 and a height of 0.4 m from the bottom. Vertically installed in the bottom direction to be located in.

Comparative Example 3

The microbubble contact portion 30 is configured in the same manner as in Comparative Example 1, except that the microbubble supply pipe 43 is vertically 1 m in the direction of the microbubble guide plate 33 from the partition 321 and 0.85 m in height from the bottom. Vertically installed in the bottom direction to be located in.

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 5 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 25 3,425 Example 2 22 3,943 Example 3 22 4,110 Example 4 30 2,852 Example 5 30 2,966 Comparative Example 1 25 2,072 Comparative Example 2 28 1,889 Comparative Example 3 25 1,934 Comparative Example 4 30 2,340

Experimental Example 2: Sewage Wastewater Treatment Efficiency

The treatment efficiency of sewage water was compared using the floating sewage sewage treatment apparatus of Examples 1 to 5 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 (%) Floating material treatment efficiency (%) Example 1 88 48 Example 2 89 55 Example 3 90 58 Example 4 86 42 Example 5 85 39 Comparative Example 1 80 15 Comparative Example 2 79 12 Comparative Example 3 80 11 Comparative Example 4 79 8

Experimental Example 3: Power Consumption

Using the floating sewage treatment system of Examples 1 to 5 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 80 Example 2 80 Example 3 80 Example 4 90 Example 5 90 Comparative Example 1 90 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
3211: radial groove 3212: microbubble guide plate
322, 323: side bulkhead 33: microbubble guide plate
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 tank 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-type 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.
The partition 321 has a concave groove formed between the wastewater inlet 31 from the terminal height of the fine bubble water supply pipe 43,
The microbubble water discharge unit 40 is provided with a microbubble water supply pipe 43, the microbubble water supply pipe 43 is installed to be inclined in the concave groove direction,
The virtual line penetrating the center of the microbubble water supply pipe 43 is installed to be inclined 10 ° to 30 ° with the vertical line,
When the distance from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31 is 100, the concave groove is located from the end height position of the microbubble water supply pipe 43 to the position of 60 to 90 in the direction of the wastewater inlet 31. Deepens the depth of the groove, again the depth of the groove,
The concave groove is a radial groove 3211 widening in the direction of the wastewater inlet 31 at the terminal height of the microbubble water supply pipe 43,
The cross-section in which the radial grooves 3211 are formed in the partition wall 321 has a distance from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31 at 100 from the end height position of the microbubble water supply pipe 43. It is a straight line inclined 5 ° to 30 ° with respect to the vertical line to the position of 60 to 90 in the direction of the wastewater inlet 31, and is formed in an arc while going in the direction of the wastewater inlet 31,
The radial groove 3211 has a distance from the end height position of the microbubble water supply pipe 43 to the wastewater inlet 31 as the direction of the wastewater inlet 31 from the end height position of the microbubble water supply pipe 43. A plurality of microbubble water guide plate 3212 is provided protruding radially to distribute the microbubble water at the position of 50 to 50,
Floating sewage treatment apparatus, characterized in that the width of the wastewater inlet 31 is 30 to 80% of the width of the partition 321. The method of claim 1,
Floating separation type sewage treatment apparatus, characterized in that the width between the two side partitions (322, 323) is gradually widened in the direction of the microbubble guide plate 33 in the wastewater inlet (31). The method of claim 2,
Floating separation type sewage treatment apparatus, characterized in that the angle between the partition 321 and the side partitions (322, 323) is 10 ° to 50 °. The method according to claim 2 or 3,
The width between the two side partitions (322, 323) is gradually widened in the direction of the microbubble guide plate 33 in the wastewater inlet 31, the mixing section 10, agglomeration section 20 or the treatment water storage tank Floating sewage sewage treatment apparatus, characterized in that it is kept constant with the same width as the width of (90). The method of claim 2,
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. Floating sewage treatment system, characterized in that the ratio of width and length is 1: 1.2 to 1: 3.

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