KR100597778B1 - Clarifier having the function of flocculation, Pin-floc removing and improved counter current problem - Google Patents

Abstract

The present invention relates to an apparatus for separating and removing particles contained in a liquid, and more particularly, the sedimentation rate is increased in a sedimentation basin in which a type 2 precipitation in which solid matter contained in a liquid is coagulated and precipitated is increased, and the escape of pin floc is prevented. Agglomeration agitation means for forming a floc to the inlet of the sedimentation basin so that the agitation means is composed of a stirrer operating in conjunction with the drive unit of the sludge collector or a static mixer that does not require a separate drive, If the flow of the symbol water and the sludge layer is in the same direction, and the flow of the symbol water and the sludge layer is reverse flow, the turbulence formation can be minimized at the intersection of the flow and the sludge blanket layer can be formed smoothly. Sedimentation efficiency can be improved by installing a plurality of plates so that the symbol water can be collected Relates to that can be removed with the solids settler.

Floc, pin floc, settling basin, stirring,

Description

Clarifier having the function of flocculation, Pin-floc removing and improved counter current problem

1 is a cross-sectional view of a circular sedimentation basin of the conventional method,

Figure 2 is a cross-sectional view of a rectangular sedimentation basin of the conventional method,

3 to 8 are cross-sectional views of the first to sixth embodiments of the sedimentation basin having a floc forming and pin floc removal function and improved backflow according to the present invention;

9 is a perspective view of a static mixer according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: round settler 2: rectangular settler

11 inlet 12: sludge collector

13 drive unit 14 agitator

15: transmission 16, 16a: static mixer

17, 17a: rotation axis 18: inlet pipe

19: inflow distribution channel 20: plate

21: sludge blanket 22: sediment sludge outlet

23: flow of symbolic water 24: flow of sedimentation sludge

25: symbolic water outlet 26: symbolic water collecting channel

27: solids collector 28: inlet

29: rectification plate 30: sludge intake

31 element 32 connecting rod

33: assembly

The present invention relates to a sedimentation basin having a floc formation at the inlet part to improve the sedimentation efficiency in a biological sedimentation basin or a chemical flocculation sedimentation basin, and adjusting the flow in the sedimentation basin so that a sludge blanket can be formed well.

Gravity sedimentation basin is mainly used for solid-liquid separation in sewage water treatment plant, water purification plant or production process. Gravity sedimentation basin can be divided into circular sedimentation and rectangular sedimentation basin.

However, the conventional sedimentation basin does not have a flocculation function for floc formation, as in the case of type 1 precipitation in which independent particles precipitate, even in the case of type 2 precipitation in which bioflocs are formed. In the case where the floc forming agitators 102 and 202 are provided, as in the circular settler 101 of FIG. 1 and the rectangular sedimentation basin 201 of FIG. 2, the driving units 104 and 203 of the sludge collector are separate from the driving units 103 and 203. 204) is installed to supply power, so it is inexpensive in terms of facility cost and power, and the stirring blade shape is also low in general because of the general paddle or crossflow and axial flow type.

In addition, the conventional sedimentation basin was a countercurrent flow in which the solid-liquid separated supernatant streams 105 and 205 and the sedimented sludge streams 106 and 206 were directed in opposite directions. As a result, pin flocs are released from the sludge blanket due to vortices at the interface of the sludge blanket in the sedimentation basin, or cross-sectional requirements of the sedimentation basin are increased, and sludge consolidation is low, resulting in a low concentration of the drawn sludge.

In order to remove the solids such as pin floc that inevitably flows out of the sedimentation basin, a filter or a flocculation sedimentation process is installed at the rear of the sedimentation basin. There is this.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, the flocculation function by the stirring means and the pin floc removal function by the collecting channel is added, the backflow flow is improved inside the sedimentation basin to improve the solids removal efficiency For the purpose of providing

In order to achieve the above object, in the present invention, a floc is formed so that the sedimentation basin is provided with a flocculating means, a supernatant water outlet, and a settling sludge withdrawal unit. The agglomeration means is a rotary type stirrer installed in the residence space of the sedimentation basin, the driving unit is installed on any one of the stirrer rotating shaft and the sludge collector rotating shaft, and a transmission is installed between the rotating shaft of the sludge collector and the rotating shaft of the stirrer. The sludge collector and the stirrer are driven by one drive unit so that the transmission and transmission can be performed simultaneously.

The flocculation means is connected to the sludge collector rotating shaft inside the sedimentation basin inlet or directly connected to a separate driving unit.

In particular, by the static mixer is installed in the inlet tube of the sedimentation basin is installed in the line mixer or the static mixer is fixed to the inlet of the sedimentation basin by means of the condensing means was configured to achieve the aggregation without the power.

Here, the static mixer is fixed to both sides by inserting the connecting rods in the assembly provided in the element consisting of a metal casting or synthetic resin injection molding of the spirally shaped plate or rotary blades so that the fluid flow is rotated 90 ° ~ 80 °, By assembling so that the rotational direction of the elements cross in opposite directions, it is possible to provide a static mixer which is more economical and has a lower defect rate than casting or welding.

In addition, the agglomeration means may be installed in the sedimentation basin inlet distribution tank for equally distributing the effluent of the reaction tank to a plurality of sedimentation basin so that flocs are formed, thereby increasing the residence time required for flocculation.

In the present invention, in order to prevent the degradation of the sedimentation efficiency due to the backflow flow of the supernatant water and the sedimentation sludge, at the front part and the lower portion of the symbolic water outlet portion of the sedimentation basin, one or more plates are installed in a stepped shape so as to vertically or inclined to prevent rising water flow. It was.

In addition, the plate for preventing the rising water flow is improved so that the sludge blanket is smoothly formed in the space partitioned by the plate and installed in a plurality of vertical or inclined at the water level in which the sludge blanket is formed.

In order to improve the counterflow flow according to the present invention, the bottom of the sedimentation basin is provided with a plurality of sludge intake holes, and the precipitated sludge is sucked through the plurality of sludge inlets provided in the hole and drawn out of the sedimentation basin. .

In addition, the sludge suction port is provided with a sludge suction hole is attached to the slug collection function is connected to the rotating shaft and the drive unit is connected to the rotating shaft, the sludge collected by the blade is sucked through the sludge suction port provided in the perforated pipe to the outside of the sedimentation basin Withdrawal of the symbolic water flows horizontally and sludge flows downward to improve the backflow.

In addition, in the present invention, the symbolic water collecting portion of the sedimentation basin can be secured to a certain depth and residence time, and consists of one or more catching water passages provided with overflow wear, and is connected to the sludge collector by the solids collector which operates by the collecting water passage. The solids precipitated in the effluent were collected and removed to remove the pin flocs in the effluent.

Hereinafter, embodiments of the present invention will be described in detail according to the accompanying drawings.

3 is a conceptual diagram related to a first embodiment of the sedimentation basin according to the present invention.

Agglomeration means for forming a floc is provided in the inner retention space of the inlet 11 of the sedimentation basin 1, wherein the agglomeration means is a rotary stirrer 14, and the rotary shaft 17a of the stirrer is a sludge collector 12. It is driven by the transmission (15) consisting of a gear or a belt provided on the rotary shaft (17).

The drive unit 13 is connected to the rotary shaft 17 of the sludge collector, and the sludge collector is driven at a circumferential speed of 1 to 2 m / min. A transmission 15 is installed between the rotary shaft 17a of the stirrer 14 and the rotary shaft 17 of the sludge collector 12 to increase the rotational speed of the stirrer in the range of 20 to 60 rpm.

In this way, the drive unit is connected to the rotary shaft of the stirrer and the shift is made on the rotary shaft of the sludge collector, so that the stirrer 14 and the sludge collector 12 can be simultaneously driven by one drive unit 13.

In the drive unit 13, the deceleration is made to the rotary shaft 17 of the sludge collector, and the rotational speed is increased again in the drive shaft 17a of the stirrer, which is an uneconomical embodiment of the sludge collector installed in the sedimentation basin. By using the drive unit 13 and the rotating shaft 17, the transmission 15 and the agitator 14 can be easily installed to realize the agglomeration means.

In addition, the flow of water in the sedimentation basin to the wall at the lower portion of the supernatant outflow portion 25 is disturbed or temporarily raised to form a rising water flow, and to prevent the fall of sedimentation efficiency and pin floc floating out At least one upward flow prevention plate member 20 is installed at the front and the lower portion of the symbolic water outlet 25. The plate 20 is preferably installed in a step shape so that the access flow rate of the water flow can be reduced in multiple stages and may be installed vertically or in a stepped slope plate. In addition, the upward flow prevention plate 20 is applied to the circular rectangular sedimentation basin 2 as in this embodiment, as well as can be effectively used without limitation in the rectangular sedimentation basin.

4 is a conceptual diagram related to a second embodiment of the sedimentation basin according to the present invention.

The embodiment of driving the rotary shaft 17 of the sludge collector 12 to the rotary shaft of the stirrer 14, the stirrer 14 having a large rotational speed is connected to the drive unit 13 provided with a reducer to reduce the primary In the rotation shaft 17 of the sludge collector 12 having a low rotational speed, the secondary shaft is decelerated by the transmission 15 so that the stirrer 14 and the sludge collector 12 having different rotational speeds are driven by one driving unit. It worked.

The stirrer 14 is rotated at 20 to 60 rpm by the speed reducer provided in the driving unit 13, and the second speed is reduced by the transmission 15 so that the rotational speed of the sludge collector 12 is 1 to 2 m in the circumferential speed. Since the motor is decelerated step by step to achieve low speed rotation in the range of / min, it is more economical in terms of the reduction ratio and the configuration of the reducer than in the embodiment of FIG.

5 is a conceptual diagram related to a third embodiment of the sedimentation basin according to the present invention.

The static mixer 16, which allows particles to collide and form flocs even at low speed, is configured to rotate in direct connection with the rotary shaft 17 of the sludge collector 12, and the transmission is omitted.

Since the circumferential speed of the sludge collector 12 is a low speed of 1 to 2 m / min by the drive unit provided with the reducer, when the inner diameter of the sedimentation basin is 20 m, the rotary shaft 17 of the sludge collector 12 is in the range of 0.05 to 0.1 rpm. Rotate at low speed. Therefore, when a general stirrer rotating in the range of 20 to 60 rpm is directly connected to the rotary shaft 17, it is difficult to effectively stir, so in this embodiment, the static mixer 16 is configured to perform stirring even at low speed rotation and low speed flow. It is provided in the rotary shaft 17.

In addition, the static mixer may be fixed to the inside of the sedimentation basin inlet portion 11 and may be stirred by the inflow flow.

The condensing means is composed of a line mixer having a structure in which the static mixer 16a is interposed therein so that the particles collide and form flocs while the sedimentation influent flows through the inlet. A separate stirring drive unit may be omitted, and stirring for flocculation is also possible.

6 is a conceptual diagram related to a fourth embodiment of the sedimentation basin according to the present invention.

Agglomeration means is a static mixer (16) which allows particles to collide and form flocs by the inflow flow in the space formed by installing the rectifying plate 29 in front of the inlet 28 of the rectangular sedimentation basin (2) The present invention relates to an embodiment in which floc formation is possible without requiring a separate driving unit.

Conventional rectangular sedimentation basin (2) is composed of a plurality of circular small diameter inlet 28 on the upper side of the sedimentation basin without a rectifying plate 29, the solid suspension mixture through the inlet 28 at a high speed The first part of the surface of the sedimentation basin is disturbed and the sedimentation efficiency is lowered. In this embodiment, the rectifying plate 29 is provided at the front of the inlet 28 in the sedimentation basin to reduce the inflow flow rate, and the static mixer 16 is provided in the internal space formed by the rectifying plate 29. Installed. Since the inflow is made in the lower part of the sedimentation basin by the rectifying plate 29, the flow in the sedimentation basin is improved and the stirring for the floc formation may be performed by the static mixer 16.

In addition, the inlet distribution channel 19 of the rectangular sedimentation basin 2 may be provided with a stirrer 14, and the stirrer may be configured to be operated by the driving unit 13 of the sludge collector 12.

The sedimentation sludge outlet 22 of the horizontal flow sedimentation basin is installed at the lower part of the inlet of the sedimentation basin, and a plurality of vertical plates are formed at the site where the flow 23 of the supernatant water 23 and the flow of the sedimentation sludge cross the counter-current in the opposite direction. When the 20 is installed, the sludge blanket 21 may be smoothly formed in the space formed by the plate members 20 which are less affected by the flow of water.

Here, by installing the plate 20 so as to be inclined along the flow direction inside the sedimentation basin, the upper symbol water flow 23 and the lower sludge layer flow 24 are buffered by the inclined plate without directly flowing back, of course, two. Since all two flows flow along the inclined direction of the plate, resistance and disturbance to the water flow can be reduced as compared with the case where the plate is installed vertically.

Agglomeration means according to the present invention is not limited to the embodiment provided in the residence space of the inlet of the sedimentation basin as in the first to fourth embodiments described so far, the agglomeration means composed of agitator provided with a driving portion is a number of effluent of the reaction tank It can be installed in an inlet distribution tank [not shown] of the sedimentation basin to be distributed evenly to the two sedimentation basins, so as to form a floc, which is also included in the scope of the present invention.

Figure 7 relates to a fifth embodiment of the sedimentation basin according to the present invention.

The sludge withdrawal part 22 of the sedimentation basin 2, that is, the sedimentation sludge withdrawal part 22 is fitted with the inlet 28 of the sedimentation basin so that the flow 23 of the supernatant water and the flow 24 of the sedimentation sludge are in the same direction. By installing at the lower part of the symbol water outlet 25 on one side, the problem of the conventional sedimentation basin in which the flow of symbol water and the flow of sediment sludge flows back to each other and the sludge blanket 21 can be smoothly maintained. Internal flow is improved. This embodiment is an example of application in the rectangular sedimentation battery 2, and can be easily applied to a circular sedimentation basin.

In addition, the flocculation means for forming the floc is provided with a static mixer 16 in the inside of the sedimentation basin (2) inlet and distribution channel 19, the static mixer 16 is the drive unit 13 and the sludge collector It can be comprised with the stirring apparatus which drives independently by the separate drive part 13a.

8 relates to a sixth embodiment of the sedimentation basin according to the present invention.

Sludge collector 12 is installed in the lower portion of the sedimentation basin 1 is composed of a blade such as a rubber plate attached to one or more perforated pipes are provided with a plurality of sludge suction port 30, the perforated pipe is driven by the rotary shaft 17 The perforated pipe and the blade are rotated in the settling basin as it is rotated in connection with the (13) to collect the sludge, the collected sludge is sucked through the sludge inlet 30 perforated in the perforated pipe is drawn out to the outside or into the reactor of the previous stage It is a structure conveyed.

In this embodiment, the sludge collector 12 is introduced into the inlet portion 11 at the upper part of the sedimentation basin, and the sludge collector 12 installed at the lower part of the sedimentation basin is rotated, and the sludge is withdrawn from the bottom of the sedimentation basin 1 through the sludge inlet 30. As it is a constitution, the reverse flow of the conventional method in which the symbol water flow and the sludge flow in the sedimentation basin flows in the opposite direction is improved, so that the symbol water flows in the outward direction, and the sedimentation sludge flows evenly downward from the entire bottom of the sedimentation basin. More effective precipitation is possible.

The air pipe provided with the sludge suction port 30 is not limited to the configuration of the sludge collector, and fixedly installs at least one hole pipe at the bottom of the sedimentation basin [not shown] and the sludge inlet provided in the hole for sludge settled at the bottom of the sedimentation basin. It can be sucked through and discharged or conveyed to the outside, which is also included in the scope of the present invention. The perforated pipe may be installed below the slope of the settling basin, or by installing a trench in which the sludge may collect at the bottom of the settling basin (not shown) and installed in the trench to facilitate sludge withdrawal. Depending on the size and shape of the sedimentation basin, the installation of the sludge collector may be omitted, or a sludge collecting trench may be provided at the lower portion of the sludge collector, and a perforated pipe may be installed inside the trench.

In addition, the symbol water catchment part of the sedimentation basin is separated from the sludge blanket and secured a certain depth and residence time so that the additional solids contained in the symbol water can be settled consists of one or more catchment channels 26 provided with the overflow wear have. The collecting channel 26 is installed with a solids collector 27 that operates in conjunction with the rotary shaft 17 of the sludge collector 12 to collect the solids deposited by pin floc in the collecting channel and discharged to the outside. It is equipped with a function to add.

The pin floc removal function shows an example applied to the horizontal flow sedimentation basin, but can be more effectively and easily applied to the upflow sedimentation basin.

In addition, in this embodiment, the agglomeration means by the static mixer 16 connected to the drive unit 13a separate from the drive unit 13 of the sludge collector 12 inside the inlet 11 and installed on a rotating shaft that rotates. It shows an embodiment in which the solid suspension mixture is agglomerated by stirring.

9 is a perspective view of a static mixer according to the present invention.

The static mixer of FIG. 9 is to provide an effective and economical static mixer for realizing the flocculating means according to the present invention.

Conventional static mixers are manufactured by welding a plurality of short elements made by twisting a corrosion resistant stainless steel plate of 90 ° to 80 ° so that the rotation directions of the short elements are alternate with each other, or by casting a long static mixer. do. It was difficult to maintain the linearity due to distortion in the welding process, and it was uneconomical in the case of casting because the manufacturing cost was high and the material cost was high.

In the present invention, the element 31 of the static mixer is molded into a metal casting or a synthetic resin injection molding formed granules, and inserted into the assembly hole 33 of the element, the connecting rod 32 of the long and corrosion-resistant material, Since the three elements 31 are assembled after being inserted so as to cross each other so that the rotational directions of the induced rotational flows cross each other, it is possible to manufacture a static mixer easily and economically. Here, the shape of the assembly tool 33 and the shape of the connecting rod 32 is made in a square so that the element does not rotate, or the element is preferably formed with two or more assembly tools and two or more connecting rods. . In addition, the element of the static mixer may be made in the form of a short plate twisted spirally or in the form of a rotor blade of the axial and quadrature type.

As described above, when the floc forming and pin floc removing functions according to the present invention are applied to the gravitational sedimentation basin having a type 2 sedimentation with improved flow backflow, the sediment collector is used or sedimentation is carried out by no force. It can add the coagulation function to improve the efficiency, improve the backflow flow inside the sedimentation basin or minimize the decline of the settling efficiency due to the backflow flow, and by collecting the fine floc discharged through the supernatant from the catchment As it can be removed, the sedimentation efficiency can be improved simply and economically by utilizing the existing facilities to the maximum.

Claims (13)

In a sedimentation basin having a floc formed to improve the sedimentation performance and the supernatant water outlet and the sedimentation sludge withdrawal unit, the agglomeration means is a rotary stirrer installed in the inlet of the sedimentation basin, the agitator and sludge A drive unit is installed in any one of the collectors, and a transmission is installed between the rotary shaft of the sludge collector and the rotary shaft of the stirrer so that the driving force is transmitted and the shifting is performed. This improved sedimentation basin. The flocculation and pin floc of claim 1, wherein the flocculating means is a static mixer installed at an inlet of the sedimentation basin and connected to a rotary shaft of the sludge collector or directly connected to a separate driving unit. Sedimentation basin with removal and improved backflow. 2. The sedimentation basin of claim 1, wherein the flocculating means is a static mixer installed inside the inlet pipe of the sedimentation basin. 2. The sedimentation basin of claim 1, wherein the flocculating means is a static mixer fixedly installed at an inlet of the sedimentation basin. According to claim 1, wherein the agglomeration means is provided with a floc forming and pin floc removal function characterized in that the floc is formed in the settling basin inlet distribution tank for distributing the effluent of the reaction tank evenly distributed into a plurality of settling basin and the counterflow flow This improved sedimentation basin. The floc forming and pin floc removing function of claim 1, wherein the settling sludge outlet is installed at a lower side of the symbol water outlet opposite to the inlet, and the flow of the symbolic water and the settling sludge in the settling basin are in the same direction. Sedimentation basin with improved backflow. 4. The static mixer according to claim 2 or 3, wherein the static mixer includes a plurality of elements and an element consisting of a metal casting or a resin injection molding in the form of a plate or a rotor blade that is spirally formed so that the fluid flow rotates from 90 ° to 80 °. A sedimentation basin with improved flocculation and counterflow flow, characterized in that the connecting rod is inserted into the assembly tool provided in the element so that the rotation direction of the element crosses in the opposite direction, and both sides are fixed. (delete) In a sedimentation basin having flocculation means and a supernatant water outlet and a settling sludge withdrawal unit for forming a floc to improve the sedimentation performance, a plurality of plates are installed in a step shape at the front part and the lower part of the supernatant outlet, Plates are flocculation and pin floc removal function, characterized in that the plurality is installed so as to be inclined along the vertical or flow direction at the water level in which the sludge blanket is formed sedimentation basin with improved flow backflow. The floc forming and pin floc removing function of claim 8, wherein the settling sludge withdrawal part is installed at a lower side of the symbol water outlet on the opposite side of the inlet, and the flow of the symbolic water and the settling sludge in the settling basin are in the same direction. Sedimentation basin with improved backflow. (delete) In the sedimentation basin is provided with flocculation means and the supernatant water outlet and the sedimentation sludge withdrawal to improve the sedimentation performance is formed floc, the bottom of the sedimentation basin is provided with a plurality of sludge suction port, the sludge suction port is provided The sludge suction port provided in the perforated pipe is attached to the hollow pipe, and the sludge collecting function of the sludge collected by the blade attached to the perforated pipe is rotated by the rotating shaft connected to the driving unit and the rotating shaft. Sedimentation basin equipped with floc formation and pin floc removal function, characterized in that the suction is drawn out through the sedimentation basin and improved the backflow flow. In the sedimentation basin is provided with flocculation means and the supernatant outflow and sediment sludge withdrawal to improve the sedimentation performance to form a floc, the symbol water collecting portion of the sedimentation basin can be secured a certain depth and residence time Flock composed of one or more catchments, the floc in the symbolic water is settled in the catchment channel, the floc characterized in that the solids precipitated in the catchment channel is removed by the solid collector connected to the sludge collector Sedimentation basin with formation and pin floc removal and improved backflow.

Images