KR101997705B1 - Dissolved air flotation type wastewater processing apparatus equipped with microbubble water complex pump with seperated waterway - Google Patents

Abstract

The present invention is to provide a dissolved air floatation type wastewater treatment apparatus having a microbubble water complex pump with a separated flow path, which does not use sub-devices with high power consumption such as pressurized pumps, compressors, and pressurized tanks, has low installation cost and power consumption, and has excellent wastewater treatment efficiency. According to the size of the microbubble water, the microbubble is transferred by a separated flow path, thereby increasing the efficiency of generating microbubbles smaller than a predetermined size.

Description

Dissolved air flotation type wastewater processing apparatus equipped with microbubble water complex pump with seperated waterway

The present invention relates to a sewage sewage treatment apparatus, in particular a floating sewage sewage treatment apparatus having a microbubble water combined pump having a separation flow path.

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.

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

The present invention does not use accessory equipment with high power consumption, such as a pressurized pump, a compressor and a pressurized tank, and has a low cost of installation and power, and a floating separation sewage treatment system having a micro bubble water composite pump having a separation flow stream having excellent sewage treatment efficiency. It is for providing a device.

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 width of the wastewater inlet 31 communicating with the lower portion of the agglomeration part 20 at the lower portion of the partition wall 321 is 30 to 80% of the width of the partition wall 321,

In the width direction between the two side partitions 322, 323, the width between the two side partitions 322, 323 increases gradually toward the microbubble guide plate 33 in the wastewater inlet 31. Lose,

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,

The microbubble guide plate 33 is formed to be inclined 30 ° to 60 ° from the bottom,

The distal end of the microbubble water supply pipe 43 is provided to be discharged in the direction of the microbubble guide plate 33 inclined 15 ° to 60 ° with the bottom of the microbubble contact part 30,

The distal 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 referred to as L, and the distal end of the microbubble water supply pipe 43 is disposed between the bottom of the microbubble contact portion 30. When the angle is θ ° and the distance from the partition 321 to the distal end of the microbubble water supply pipe 43 is ℓ, ℓ is L × (θ-30) / 180 ≦ L ≦ L × θ / 180 and 1L Positions satisfying all conditions ≥ 0,

When the height of the wastewater inlet 31 is called H and the height from the bottom of the distal end of the microbubble water supply pipe 43 is h, h is H × (θ-5) / 100 ≦ h ≦ H × height satisfying the condition of (θ + 30) / 100,

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

It includes; 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 interior space 4143 of the discharge portion 414 is spherical,

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,

The microbubbles smaller than a predetermined size are discharged from the dividing unit 412 and move through the central portion of the internal space 4143 and are discharged to the discharge port 4141.

The present invention is less than a predetermined size by using a small power consumption, excellent sewage water treatment efficiency, and microbubble water is transported by the separation channel according to the size of the microbubble, without using the accessory equipment with high power consumption, such as a pressure pump, a compressor and a pressure tank. It is possible to provide a floating separation type sewage treatment apparatus having a microbubble water composite pump having a separation flow path having an increased efficiency of generating microbubbles.

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.
Figure 4 is a plan view of the microbubble contact portion of the floating sewage sewage treatment apparatus according to an embodiment of the present invention in which the microbubble water supply pipe is installed vertically.
5 is a width of the wastewater inlet in the floating sewage sewage treatment apparatus according to an embodiment of the present invention in which the microbubble water supply pipe is installed vertically 50% of the width between the side bulkheads, and the width between the side bulkheads is the direction of the microbubble guide plate. This is a plan view of the microbubble contact portion gradually widening.
Figure 6 is an enlarged front view of the lower portion of the microbubble contact portion of the floating sewage sewage treatment apparatus according to an embodiment of the present invention, the longitudinal position and height in accordance with the angle of the distal end of the microbubble water supply pipe in one view will be.
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 a plan view of the microbubble contact portion 30 of the floating separation sewage treatment apparatus according to the embodiment of the present invention in which the microbubble water supply pipe 43 is installed vertically, and FIG. 5 is the microbubble water supply pipe ( In the floating sewage sewage treatment apparatus according to the embodiment of the present invention, in which 43) is installed vertically, the width of the wastewater inlet 31 is 50% of the width between the side partitions, and the width between the side partitions 322 and 323 is increased. 6 is a plan view of the microbubble contact portion 30 gradually widening in the direction of the microbubble guide plate 33, and FIG. 6 is an enlarged front view of the lower part of the microbubble contact portion 30 of the flotation type sewage treatment apparatus according to the embodiment of the present invention. Microbubble ball The position and height of the longitudinal direction according to the angle of the distal end of the air supply pipe 43 are shown in one figure.

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.

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 micro bubble water discharge unit 40 will be described first.

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.

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.

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 is desirable to increase the contact efficiency between the microbubble water and the wastewater in the direction of (33).

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.

The distal end of the microbubble water supply pipe 43 may be provided to be discharged in the direction of the microbubble guide plate 33 at an angle of 15 ° to 60 °, preferably 20 ° to 45 ° with the bottom of the microbubble contact part 30. If the angle is too low, it is difficult to install the microbubble water supply pipe 43 which is installed to be introduced into the lower portion of the microbubble contact portion 30 from the outside of the microbubble contact portion 30, the angle is too high or installed vertically In some cases, a part of the microbubble water discharged from the microbubble water supply pipe 43 may be discharged toward the wastewater inlet 31 so that it is difficult to smoothly raise the floc.

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.

The distal end position of the microbubble water supply pipe 43 is preferably the center of the width direction. In addition, referring to the enlarged view of the microbubble contact portion 30 in Figure 6, the end position of the microbubble water supply pipe 43 is the microbubble guide plate from the partition wall 321 is formed with the wastewater inlet 31 in the longitudinal direction The length up to (33) is L, and the distal end of the microbubble water supply pipe 43 is an angle between the bottoms of the microbubble contact parts 30 at θ °, and the distal end of the microbubble water supply pipe 43 from the partition wall 321. When the distance to L is L × (θ-30) / 180 ≦ L ≦ L × θ / 180, L ≧ 0, the height of the wastewater inlet 31 is H, and the fine bubble water When the height from the bottom of the distal end of the supply pipe 43 is h, it is preferable that H x (θ-5) / 100 ≤ h ≤ H x (θ + 30) / 100. That is, as the angle between the bottom of the microbubble water supply pipe 43 increases the angle between the bottoms of the microbubble contact parts 30, the position of the end of the microbubble water supply pipe 43 is the microbubble guide plate 33 at the partition wall 321 in the longitudinal direction. Moving in the direction, and the height of the distal end of the microbubble water supply pipe 43 may increase the efficiency of treatment by effectively promoting contact between the microbubble water and the wastewater.

The height of the wastewater inlet 31 is 300 to 800 mm, and the microbubble water supply pipe 43 may be provided to discharge the microbubble water in the bottom direction at a height of 150 to 600 mm from the bottom of the microbubble contact portion 30. In this case, the height of the partition walls 321, 322, and 323 may be about 2 to 4.5 m from the bottom.

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. 4, the ratio of the width and the length of the microbubble contact 30 is 1: 3, 1.8 m wide, 4.2 m long and 2.2 m high, and the wastewater inlet 31. The height of 0.4 m, the width is 1.8 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 was installed in the bottom direction perpendicular to the height of 1.6 m in the direction of the micro-bubble guide plate 33, 0.4 m from the bottom in the partition 321.

Example 2

Referring to the plan view of the microbubble contact portion 30 of FIG. 5, the wastewater inlet 31 is installed at the center of the partition 321 and has a width of 0.9 m, and the two side partitions 322, which are in contact with the left and right sides of the wastewater inlet, are disposed. The width between the 323 is gradually widened at an angle of 45 ° while going in the direction of the microbubble guide plate 33, and the rest is configured in the same manner as in Example 1.

Example 3

In the same manner as in Example 2, the microbubble contact portion 30 is configured, except that the microbubble discharge pipe 43 is located at the distal end portion 0.3 m in the direction of the microbubble guide plate 33 from the partition wall 321 at a height of 0.1 m from the bottom. It was installed at 20 ° from the bottom.

Example 4

In the same manner as in Example 2, the microbubble contact portion 30 is configured, except that the microbubble discharge pipe 43 is located at the distal end position of 0.5 m in the direction of the microbubble guide plate 33 and 0.2 m from the bottom. 15 ° from the bottom to ensure that the installation.

Example 4

In the same manner as in Example 2, the microbubble contact portion 30 is configured, except that the microbubble discharge pipe 43 is located at the distal end position of 0.7 m and 0.2 m from the bottom in the direction of the microbubble guide plate 33 in the partition wall 321. It was installed at 40 ° from the bottom.

Example 5

In the same manner as in Example 2, the microbubble contact portion 30 is configured, except that the microbubble discharge pipe 43 is positioned at the distal end portion 1 m in the direction of the microbubble guide plate 33 from the partition wall 321 and at a height of 0.3 m from the bottom. It was installed at 60 ° from the bottom.

Comparative Example 1

In the same manner as in Example 2, the microbubble contact portion 30 is configured, except that the microbubble discharge pipe 43 is positioned at the distal end portion 1 m in the direction of the microbubble guide plate 33 from the partition wall 321 and at a height of 0.4 m from the bottom. It was installed vertically to the floor direction.

Comparative Example 2

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: 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 and 2. 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 1 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 82 31 Example 2 84 35 Example 3 85 41 Example 4 86 44 Example 5 85 42 Comparative Example 1 80 15 Comparative Example 2 79 8

Experimental Example 2: Power Consumption

Using the floating sewage treatment system of Examples 1 to 5 and Comparative Examples 1 and 2, 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 90 Example 3 90 Example 4 90 Example 5 90 Comparative Example 1 90 Comparative Example 2 150

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
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 (6)

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,
The width of the wastewater inlet 31 communicating with the lower portion of the agglomeration part 20 at the lower portion of the partition wall 321 is 30 to 80% of the width of the partition wall 321,
In the width direction between the two side partitions 322, 323, the width between the two side partitions 322, 323 increases gradually toward the microbubble guide plate 33 in the wastewater inlet 31. Lose,
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,
The microbubble guide plate 33 is formed to be inclined 30 ° to 60 ° from the bottom,
The distal end of the microbubble water supply pipe 43 is provided to be discharged in the direction of the microbubble guide plate 33 to be inclined 15 ° to 60 ° with the bottom of the microbubble contact part 30,
The distal 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 referred to as L, and the distal end of the microbubble water supply pipe 43 is disposed between the bottom of the microbubble contact portion 30. When the angle is θ ° and the distance from the partition 321 to the distal end of the microbubble water supply pipe 43 is ℓ, ℓ is L × (θ-30) / 180 ≦ L ≦ L × θ / 180 and 1L Positions satisfying all conditions ≥ 0,
When the height of the wastewater inlet 31 is called H and the height from the bottom of the distal end of the microbubble water supply pipe 43 is h, h is H × (θ-5) / 100 ≦ h ≦ H × height satisfying the condition of (θ + 30) / 100,
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
It includes; 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 interior space 4143 of the discharge portion 414 is spherical,
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 of claim 1,
Floating separation type sewage treatment apparatus, characterized in that the height of the blocking plate (4142) of the microbubble complex pump (41) is 5 to 40% of the diameter of the spherical inner space (4143). The method of claim 2,
The height of the blocking plate 4142 of the microbubble complex pump 41 is high in the rotational direction of the rotational grid 413, and the floating separation sewage treatment apparatus, characterized in that the truncated cylindrical shape is low in the opposite direction. . The method of claim 1,
Floating separation type sewage treatment, characterized in that the diameter of the spherical inner space (4143) of the microbubble complex pump 41 is 3 to 6 times the inner diameter of the flow path of the partition 412 formed around the rotary grid 413. Device. The method of claim 4, wherein
Floating separation sewage treatment, characterized in that the flow path inner diameter of the inlet portion 411 of the microbubble complex pump 41 is 2 to 4 times the inner diameter of the flow path of the divided portion 412 formed around the rotary grid 413. Device. The method according to any one of claims 1 to 5,
The treated water is supplied to the inlet 411 of the microbubble complex pump 41 at a suction 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.

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