KR101773023B1

KR101773023B1 - Scum removing apparatus

Info

Publication number: KR101773023B1
Application number: KR1020150143657A
Authority: KR
Inventors: 이순복
Original assignee: 주식회사 지승개발
Priority date: 2015-10-14
Filing date: 2015-10-14
Publication date: 2017-08-31
Also published as: KR20170043945A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scum removing device for removing scum floating on a water surface of a treated water, which is installed in a sedimentation basin settling tank for purifying waste water and wastewater. The scum removing device includes a rail crossing the upper part of the settling tank, And a scum collecting device installed on one side of the settling tank and collecting the scum pushed by the blade and discharging the scum to the outside of the settling tank, .

Description

[0001] The present invention relates to a scum removing apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scum removing device installed on a sedimentation basin settling tank for purifying waste water and wastewater to remove scum floating on the water surface of treated water, Which requires little maintenance.

As the national income increases and the living and living standards are improved, various kinds of wastewater flowing into sewage are increasing. These wastewaters pollute rivers, rivers, and lakes greatly and are becoming social problems.

Generally, a variety of sewage and wastewater treatment plants for purifying various wastewater have been proposed and widely used so far, and the treatment methods most commonly used among wastewater treatment methods are as follows.

When wastewater flows into the sewage treatment plant, firstly, relatively bulky substances such as sand, gravel, wood chips and cans contained in the sewage are removed from the settlement.

Sewage water passing through the gypsum is uniformly mixed in the flow rate control tank, and the flow load is buffered by the increase or decrease of the inflow of sewage water, and the microorganisms are transported to the sedimentation basin by a predetermined amount to maintain proper environment for biological sewage treatment using microorganisms.

The sewage transported in the flow control tank by a constant amount removes heavy materials and light materials from the first sedimentation tank.

The pollutants in the sewage that have not been removed by sedimentation in the initial sedimentation basin are decomposed by aerobic microorganisms in the aeration tank and the microorganisms and contaminants form flocs and sink in the next process, the final sedimentation basin.

In the aeration tank, the flocs formed by the aerobic microorganisms are settled again in the final settling basin. Unlike the initial settling basin, the clear basin is obtained and discharged into the stream.

As described above, the wastewater flowing into the sewage treatment plant is treated in a state in which the wastewater flowing into the sewage treatment plant is continuously flowing, and thus, many scum floats are generated on the surface of each sedimentation tank.

In order to remove the scum on the surface of the sedimentation water, the chain 12 is connected to the drive wheel 10 and the driven wheel 11 above the sedimentation basin, The scrapers 14 are rotated by the scrapers 14 through the fastening holes 13 at predetermined intervals so that the scrapers 14 scrape the scum floated on the upper side of the treated water and sweep them toward the separating wall 15, To the scum outlet (16).

In the conventional scum removing device configured as described above, the scraper 14 must be locked at a predetermined depth on the water surface so as to be able to scrape floating scum. As time elapses, the chain 12 expands and the scraper 14 is completely immersed in the water surface, A problem arises in that the scum can not be properly scratched. Therefore, there is an inconvenience that the operator has to manually adjust the tension of the chain 12 over a certain period of time.

In the conventional other scum removing device shown in Figs. 2 and 3, the collecting tube 20 having a cylindrical shape capable of being rotated by forming an inlet 21 on one side is partially submerged in the sedimentation water surface, The scum is configured to discharge through the inside of the collecting cylinder 20 through the discharge port 23 formed on one side or both sides when the scum is introduced into the inlet 21 of the cylindrical collecting cylinder 20. [

The conventional scum removing device configured as described above rotates the cylindrical collecting container 20 by rotating the wheel 22 formed on one side of the cylindrical collecting container 20 by the driving means such as the worm 24, Is adjusted so as to coincide with the height of the sedimentation basin by regulating the height of the inflow port.

However, such a conventional scum removing device has a disadvantage that scum or foreign matter is caught between the wheel 22 and the worm 24 as shown in FIG. Further, there is a limit because the height of the inlet 21 can be adjusted only within the diameter range of the cylindrical collecting cylinder 20.

Document 1: Korean Patent Registration No. 10-0620872, "Scum removing device" Document 2: Korean Patent Registration No. 10-0982756, "floating scum removing device"

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a scum collecting apparatus which can freely adjust a position of a scum collecting apparatus according to a height of a water surface of a settling basin, It is an object of the present invention to provide a scum removing device which can cleanly remove scum without scum, and which requires little maintenance and maintenance.

According to an aspect of the present invention, there is provided a scum removing device comprising: a rail (101) across an upper part of a settling tank; A scraper driver 110 moving along the rail 101; A blade 120 connected to the scraper driver 110 by a lifting / lowering rod 115 to vertically move up and down the water surface of the settling tank; And

And a scum collecting device 200 provided at an inlet 212 and provided at one side of the settling tank for collecting the scum pushed by the blade 120 and discharging the scum to the outside of the settling tank.

At this time, the scraper driver (110)

Inside the housing 111, a cylinder 114 supported by the housing 111 is provided,

The cylinder 114 is controlled to lower the lower end of the blade 120 by a predetermined depth from the water level by lowering the lifting / lowering rod 115 according to the level value measured by the ultrasonic flowmeter,

Or the cylinder 114 raises and lowers the lifting and lowering rod 115 to raise the blade 120 above the water surface.

In particular, the cylinder 114 controls the lower end of the blade 120 to be locked by a predetermined depth from the water level by lowering the lifting / lowering rod 115 according to the measured value of the ultrasonic flowmeter,

When the blade 120 moves in the direction of the scum collecting apparatus 200 and one limit switch 204 is pressed, the lifting and lowering rod 115 is lifted and raised to raise the blade 120 above the water surface,

When the blade 120 is returned to the opposite direction to the scum collecting apparatus 200 and the other limit switch 204 is pushed, the ascending / descending rod 115 is lowered to control the lower end of the blade 120 to be locked by a predetermined depth from the water level .

On the other hand, a long rod-shaped support panel 121 is provided at the lower end of the lifting rod 115,

Side bent portions 122 are formed at both ends of the support panel 121 at predetermined angles in a direction opposite to a direction in which the scum is pushed and conveyed.

A nozzle 123 for spraying the vapors in a direction in which the scum is pushed and advanced is provided in at least a portion of the support panel 121 including the side bending portion 122,

A blade 120 for pushing and transporting scum is fastened to one side of the support panel 121.

Meanwhile, the scum collecting apparatus 200 includes an inlet 212 formed at one side of the body 210 to receive scum; A scum flow groove 214 formed in the center of the body 210 in a groove shape; And an inclined surface 213 inclined downward from the inlet 212 to the scum flow grooves 214.

The scum flowing into the inlet 212 flows down the scum flow grooves 214 along the inclined surface 213 and is discharged to the outside along the scum flow grooves 214.

Descending rod 203 ascending and descending along the cylinder 202 provided in the settling tank so that the inlet 212 ascends and descends to coincide with the water level.

Both sides of the scum collecting device 200 are provided with side protrusions 216 that are bent in the same shape as the side bending portions 122 of the blades 120 and contact the inner wall of the settling basin,

The front sub-panel 217 or the front protrusion 217 'protruding toward the scraper driver 110 is further provided at the lower end of the inlet 212 of the scum collecting apparatus 200 so that the scum conveyed is collected .

To achieve the above object, another aspect of the scum removing device according to the present invention includes a rail 101 across an upper part of a settling tank;

A housing 111 having a driver wheel 113 that is rotated by the driving of the motor 112 and moves along the rail 101 by driving the motor 112;

A cylinder 114 installed inside the housing 111;

A lifting rod 115 formed in the shape of a 'T' having a rod latch 116 at an upper portion thereof and projecting to the lower portion of the housing 111 and the rod latch 116 being fastened to the cylinder 114; And

And a wide plate-shaped blade 120 fastened to the lower end of the lifting / lowering rod 115.

At this time, the cylinder 114 is driven to lower the lower end of the blade 120 so as to be submerged on the water surface, or lift the blade 120 up and down the water surface,

The motor 112 is driven to move the blade 120 horizontally while the lower end of the blade 120 is immersed in the water surface and the scum is pushed to the one side of the settling tank or when the blade 120 is lifted above the water surface, (112) is driven to return the blade (120).

To achieve the above object, another aspect of the scum removing device according to the present invention includes an inlet 212 formed at one side of a body 210;

A scum flow groove 214 formed in the center of the body 210 in a groove shape; And

An inclined surface 213 inclined downward from the inlet 212 to the scum flow grooves 214;

A lifting rod 203 fastened to the body 210; And

And a cylinder 202 which is coupled to the sedimentation tank to move the lifting / lowering rod 203 up and down.

At this time, the cylinder 202 is driven to match the inlet 210 to the water level, and the scum flowing through the inlet 210 flows down to the scum flow grooves 214 along the slope 213, And to discharge the scum of the flow grooves 214 to the outside of the settling tank.

In the scum removing device of the present invention having the above-described structure, the height of the scraper and the collecting device is dynamically controlled by using an ultrasonic flow meter. By using the limit switches on both sides, It becomes possible to repeatedly remove scum by sweeping.

Particularly, a side bending portion is formed in the blade, and a bubble water nozzle is provided to wash the scum along the both side walls during the operation of the scraper so that the scum is not deposited.

In addition, by placing the front sub-panel or the front projection on the front of the scum collecting device, the scum conveyed by the blade can be completely collected into the scum collecting device.

1 shows a conventional scraper configuration.
Fig. 2 and Fig. 3 are diagrams showing a conventional scum collecting apparatus. Fig.
4 is a perspective view showing a scum removing device according to the present invention.
5 is a front sectional view showing the internal structure of a scraper driver.
6 is a side sectional view showing the internal structure of the scraper driver.
7 is a view showing a blade lifting movement by a cylinder drive of a scraper driver.
8 is a perspective view showing a state in which the number of vesicles is sprayed from a nozzle provided in a scraper.
9 is a perspective view showing the scum collecting apparatus of the present invention.
10 is a side sectional view showing the internal configuration of the scum collecting device.
11 to 14 sequentially illustrate the operation of the scum removing device of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the present invention and the accompanying drawings, wherein like reference numerals refer to like elements.

It is to be understood that when an element is referred to as being "comprising" another element in the description of the invention or in the claims, it is not to be construed as being limited to only that element, And the like.

The scum removing apparatus according to the present invention is installed in a sedimentation tank for treating wastewater. The scum removing apparatus according to the present invention comprises a scraper 100 for scraping and moving a scum floating on the water surface, a scum collecting and discharging scum transferred to the scraper 100, Device 200 as shown in FIG.

At this time, as shown in FIG. 4, the scraper 100 moves along the rail 101 installed across the upper part of the sedimentation basin and scatters and moves the scum floating on the water surface.

The scum collecting apparatus 200 is installed at one side of the sedimentation tank and receives the scum scraped by the scraper 100 and discharges the scum to the outside of the sedimentation tank.

The scraper 100 includes a blade 120 for scraping and transporting a partially submerged scum on the lower and wastewater surfaces of a settling basin and a blade 120 for horizontally moving the blade 120 to move the blade 120 so that the blade 120 can scrape the scum. And a lifting rod 115 connecting the scraper driver 110 and the blade 120. The scraper driver 110 includes a scraper 110,

The scraper driver 110 is a driving means for horizontally moving the blade 120 while moving along the rail 101 installed across the upper portion of the settling basin, as shown in FIG. 5, a housing (not shown) A driver wheel 113 installed at an upper portion of the housing 111 and rolling along the rail 101 and a scraper driver 110 rotating the driver wheel 113 to rotate the rail 101 And a motor 112 for moving the motor.

5, an I-shaped steel is installed as a rail 101, and a driver wheel 113 driven by a motor 112 is moved along a horizontal plane of the rail 101 to form a scraper driver 110 are horizontally moved.

5 and 6, a cylinder 114 is installed inside the housing 111. The cylinder 114 is supported on the bottom surface of the housing 111, The lifting / lowering rod 115 is lifted and lowered as shown in FIG. 7 by lifting or lowering the lifting rod 116 inside the housing 111. [

As the cylinder 114, a known electric cylinder 114 may be used.

As described above, the support panel 121 having a wide plate shape is fastened to the lower end of the lifting / lowering rod 115 which is moved up and down by the driving of the cylinder 111. The support panel 121 is provided with a blade 120 are fastened. The support panel 121 is formed of a metal material so as to maintain the shape of the blade 120 and the blade 120 is formed of a synthetic resin or a rubber material so as to protect the sedimentation tank wall and the scum collecting apparatus 200.

The blade 120 is scraped by the scraper driver 110 while being horizontally moved to the scum collecting device 200 while scraping the scum floating on the surface of the sedimentation tank.

At this time, as shown in FIG. 8, both side ends of the support panel 121 contacting the inner surface of the sedimentation tank are horizontally bent at a predetermined angle to form the side bending portion 122, so that when the blade 120 moves while scraping the scum, It is preferable that both side portions of the blade 120 bent by the bending portion 122 come into contact with the inner surface of the settling tank so that the scum sticking to the side of the wall can be scraped cleanly.

Particularly, the side bending portion 122 is provided with a nozzle 123 for spraying the vapors. It is possible to crush the scum so that the scum is not deposited in the gap between the blade 120 and the wall surface by spraying the vapors water when the blade 120 is moved.

Preferably, the support panel 121 may further include a nozzle 123 for spraying the suppositories at predetermined intervals in the horizontal direction.

The plurality of nozzles 123 provided on the support panel 121 are arranged in the same direction as the scoop collecting apparatus 100. The plurality of nozzles 123 provided on the support panel 121 are arranged in the same direction as the scum- (200) so as to transfer a large amount of scum to the scum collecting device (200) at one time.

In addition, when the blades 120 scrape the scum and come into contact with or close to the scum collecting apparatus 200, the nozzles 123 are moved in a direction It is possible to prevent clogging of the scum inlet 212 of the scum collecting apparatus 200 by cleaning the scum inlet 212 of the scum collecting apparatus 200. [

Such a nozzle 123 may be provided so as to be diagonally downward, as shown enlarged in FIG. Accordingly, the bubble count can effectively break the scum and push it out when the blade 120 moves.

The scum collecting apparatus 200 is installed on one side of the settling tank and scraper 100 scrapes the scum floating on the bottom of the settling tank and transports the scum to collect the scum and discharge it to the outside of the settling tank.

As shown in Fig. 9, the scum collecting apparatus 200 according to the present invention is fastened to the lower end of the lifting / lowering rod 203, and the lifting / lowering rod 203 is connected to a collecting device The scoop collecting apparatus 200 is moved up and down by the cylinder 202 of the support table 201 so that the inlet 212 of the scum collecting apparatus 200 is positioned at the level of the settling tank do.

9 and 10, the scum collecting apparatus 200 includes a lid 211 coupled to the upper portion of the body 210 and an inlet 212 through which the scum flows between the body 210 and the lid 211, .

A slope 213 is formed in the upper part of the body 210 so as to be inclined downwardly from the inlet 212 to the scum flow groove 214, do.

The scum collecting apparatus 200 constructed as described above scatters the scum by scraping the scum and pushing the scum into the inlet 212 of the scum collecting apparatus 200 so that the scum flows along the inclined surface 213 The scum flows into the scum flow grooves 214 and the scum collected in the scum flow grooves 214 is discharged to the outside of the settling tank through the scum discharge pipe 215 of FIG.

9, both sides of the scum collecting apparatus 200 form the side projecting portions 216 at angles and shapes corresponding to the side bending portions 122 on both sides of the blade 120 of the scraper 100, 120 are moved to contact the scum collecting device 200, it is preferable that all the scum on the side bending portion 122 can be pushed into the inlet of the scum collecting device 200.

On the other hand, preferably, as illustrated in FIG. 10A, a front auxiliary panel 217 may protrude from the lower end of the scum collecting apparatus 200.

The blade 120 stops moving forward when the limit switch 204 is pressed as the blade 120 approaches the scum collecting apparatus 200 sufficiently as described later, (217). The scum transferred by the blade 120 can be collected without being left on the outside of the scum collecting apparatus 200.

10 (b), the lower end portion of the scum collecting apparatus 200 is projected forward by a predetermined distance in the direction of the blade 12, instead of placing the separate front auxiliary panel 217 It is possible to replace the front auxiliary panel 217 by providing the front projection 217 '.

The operation of the scum removing device of the present invention constructed as described above will be described.

As shown in Fig. 11, a scraper 100 is located at one side of the sedimentation tank and a scum collecting device 200 is located at the other side of the sedimentation tank to remove the scum floating in the sedimentation tank.

The cylinder 202 of the scum collecting apparatus 200 adjusts the height of the scum collecting apparatus 200 to the level of the settling tank so that the inlet 212 of the scum collecting apparatus 200 The height of the scum collecting apparatus 200 is adjusted so that the wastewater does not overflow.

On the other hand, the cylinder 114 of the scraper 100 also causes the ascending / descending rod 115 to descend such that the blade 120 is locked to the water surface by 5 to 10 mm.

The scraper driver 110 is driven to move along the rail 101 in the direction of the scum collecting apparatus 200 while the blade 120 is partly immersed in the water surface, And scraps the scum to be transported to the scum collecting apparatus 200.

At this time, as shown in FIG. 8, the nozzle 123 of the support panel 121 that fixes the blade 120 injects the vapors into the nozzle 123 to smooth the scum conveyance and break the scum that has gathered in the form of bubbles or lumps .

Both ends of the blade 120 move in contact with the inner wall of the precipitation tank, so that all the scum on the inner wall of the precipitation tank can be removed.

The scraper 120 scrapes the floating scum while the blade 120 moves along the water surface of the settling tank and transfers it to the scum collecting apparatus 200 as shown in FIG. 12, so that the scraper 120 or the ascending / descending rod 115 is moved to the limit switch 204 of the scum collecting apparatus. , The scumper driver 110 stops driving, and the scum flows into the inlet 212 of the scum collecting apparatus 200 and is discharged to the outside of the settling tank.

Since both sides of the scum collecting device 200 are in contact with the inner wall of the sedimentation tank, the whole scum transferred to the blade 120 can be collected and discharged to the outside.

13, the cylinder 114 in the scraper driver 110 lifts up the lifting rod 115 to raise the blade 120 to the water surface, and the scraper driver 110 rotates the rails 101 ) To return to the side of the settling tank.

On the other hand, when the limit switch 204 is provided on the opposite side, the movement of the scraper driver 110 is stopped, and the blade 120 is lowered as shown in FIG. 11 to be partially immersed in the water surface.

Thereafter, the scraper driver 110 is moved in the direction of the scum collecting apparatus 200 and driven repeatedly.

That is, the operating range of the scraper driver 110 is limited by the pair of limit switches 204 provided at both ends. Meanwhile, during the movement of the scraper driver 110 toward the scum collecting apparatus 200, the scum is moved by being locked by a certain depth from the water surface, and while returning to the opposite side, the scum is returned to the surface of the water surface, .

The height of the blade 120 of the scraper driver 110 and the height of the inlet 212 of the scum collecting apparatus 200 may be measured by measuring the water level using an ultrasonic flowmeter at the time of ascending / descending of the scraper driver 110, Adjust the relative position with respect to the water surface. That is, as the level increases or decreases, the height of the blade 120 of the scraper driver 110 and the inlet 212 of the scum collecting apparatus 200 is adjusted to prevent the scum removing efficiency from being lowered.

As described above, the scraper driver 110 moves along the rail 101 by driving the motor 112. In order to supply power to the motor 112, A plurality of trolleys 103 are installed on the cable 102 so as to slide along the cable 102. The trolley 103 is installed on the cable 102. The trolley 103 is installed on the cable 102,

At this time, a power line 104 for supplying power to the motor 112 of the scraper driver 110 and a faucet water pipe 105 for supplying faucet water by a plurality of nozzles 123 are hung from the trolley 103 When the scraper driver 110 moves along the rail 101, the power line 104 and the faucet water pipe 105 are moved together with the scraper driver 110 along the cable 102 by the trolley 103 So that it does not interfere with the reciprocating motion of the scraper driver 110.

Since the trolley 103 is a well-known technology, a detailed description thereof will be omitted.

The technical idea of the present invention has been described above with reference to the embodiments.

It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described above from the description of the present invention.

Further, although not explicitly shown or described, those skilled in the art can make various modifications including the technical idea of the present invention from the description of the present invention Which is still within the scope of the present invention.

The above-described embodiments described with reference to the accompanying drawings have been described for the purpose of illustrating the present invention, and the scope of the present invention is not limited to these embodiments.

100: scraper 101: rail
102: cable 103: trolley
104: power supply line 105: parcel water piping
110: scraper driver 111: housing
112: motor 113: driver wheel
114: cylinder 115: ascending / descending rod
116: load latch 120: blade
121: support panel 122: side bending part
123: Nozzles
200: scum collecting device 201: collecting device supporting device
202: cylinder 203: ascending / descending rod
204: limit switch 210: body
211: lid 212: inlet
213: slope surface 214: scum flow groove
215: scum drain pipe 216: side protrusion
217: front auxiliary panel 217 ': front projection

Claims

A rail 101 across the top of the settling tank;
A housing 111 having a driver wheel 113 that is rotated by the driving of the motor 112 and moves along the rail 101 by driving the motor 112;
A cylinder 114 installed inside the housing 111;
A lifting rod 115 formed in the shape of a 'T' having a rod latch 116 at an upper portion thereof and projecting to the lower portion of the housing 111 and the rod lock 116 being fastened to the cylinder 114; And
And a blade 120 in the form of a wide plate fastened to the lower end of the lifting rod 115,
The cylinder 114 is driven so that the lower end of the blade 120 is lowered to be submerged on the water surface or the blade 120 is lifted up and raised above the water surface,
The motor 112 is driven to move the blade 120 horizontally while the lower end of the blade 120 is immersed in the water surface and the scum is pushed to the one side of the settling tank or when the blade 120 is lifted above the water surface, (112) is driven to return the blade (120).

The method according to claim 1,
The cylinder 114 is controlled to lower the lower end of the blade 120 by a predetermined depth from the water level by lowering the lifting / lowering rod 115 according to the level value measured by the ultrasonic flowmeter,
Or the cylinder (114) lifts up the lifting rod (115) to raise the blade (120) above the water surface.

3. The method of claim 2,
The cylinder 114 controls the lower end of the blade 120 to be locked from the water level by a predetermined depth by lowering the lifting / lowering rod 115 according to the measurement value of the ultrasonic flowmeter,
When the blade 120 moves in the direction of the scum collecting apparatus 200 and one limit switch 204 is pressed, the lifting and lowering rod 115 is lifted and raised to raise the blade 120 above the water surface,
When the blade 120 returns to the opposite direction to the scum collecting apparatus 200 and the other limit switch 204 is pressed down, the ascending / descending rod 115 is lowered to control the lower end of the blade 120 to be locked by a predetermined depth from the water level The scum removing device repeats the scum removing operation.

The method according to claim 1,
The lifting rod 115 is provided at its lower end with a long bar-shaped support panel 121,
Side bent portions 122 are formed at both ends of the support panel 121 at predetermined angles in a direction opposite to a direction in which the scum is pushed and conveyed.
A nozzle 123 for spraying the vapors in a direction in which the scum is pushed and advanced is provided in at least a part of the section of the support panel 121 including the side bending portion 122,
And a blade (120) for pushing and conveying the scum is fastened to one side of the support panel (121).

The method of claim 3,
The scum collecting apparatus (200)
An inlet 212 formed at one side of the body 210 to receive the scum;
A scum flow groove 214 formed in the center of the body 210 in a groove shape;
And the inclined surface 213 inclined downward from the inlet 212 to the scum flow grooves 214. The scum flowing into the inlet port 212 flows down the scum flow grooves 214 along the inclined surface 213 And is discharged to the outside along the scum flow grooves 214,
Wherein the inlet port (212) is configured to be able to move up and down so as to coincide with the water level by being connected to the lifting / descending rod (203) ascending / descending along the cylinder (202) provided in the settling tank.

6. The method of claim 5,
The scoop collecting apparatus 200 is provided at both sides of the scoop collecting apparatus 200 with side protrusions 216 that are bent in the same shape as the side bending section 122 of the blade 120 and contact the inner wall of the precipitation tank,
The scum collecting apparatus 200 further includes a front sub-panel 217 or a front protrusion 217 'projecting in the direction of the scraper driver 110 moving along the rail 101 at the lower end of the inlet 212 of the scum collecting apparatus 200, Removal device.

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