KR101840040B1 - Decanter - Google Patents

Abstract

The present invention relates to an overlying water draining apparatus, and more specifically, to an overlying water draining apparatus, which is positioned inside at least one reaction tank (1000) of a continuous batch reactor, a settling tank and a concentrating tank to discharge solid-liquid separated supernatant to the outside of the reaction tank (1000), wherein the overlying water draining apparatus comprises: a buoyant body (100) having a predetermined shape; and a supernatant suction part (200) connected to the buoyant body (100), wherein the supernatant suction part (200) comprises: a suction pipe (210) having one side connected to a suction means; and an inflow pipe (220) communicating with the suction pipe (210) to suck the supernatant by suction force of the suction means and opened toward the bottom surface of the reaction tank (1000).

Description

[0001]

The present invention relates to a supersonic discharge device, and more particularly, to a supersonic discharge device that includes a plurality of suction pipes and a sludge inflow prevention plate with openings facing downward, thereby effectively suppressing the mixing of the scum layer and the settling sludge, ≪ / RTI >

The Sequencing Batch Reactor (SBR) process for treating wastewater such as domestic sewage was first proposed by Sir Thomas Wardle of England in 1893 as a method based on a batch process. It was then used in small scale by Melling and Suckworth in 1914. The automatic valve system, electric timer and other water level control devices were developed and put into practical use, Hoover, Porges, etc., SBR construction method was reconsidered, and since the 1970s, it has been getting attention once again by the recognition of the superiority of SBR construction method by Irvine.

In this SBR method, a plurality of spatially divided reaction vessels are combined into one single reaction vessel, and each reaction proceeds in order of time. In other words, the SBR method is as follows. The functions of the reaction tank, which is composed of the incoming, anaerobic, expired, settled, and discharged in the order of time, are described as follows.

1) Fill: During the inflow period, the sewage is filled with the desired volume while contacting the remaining microorganisms in the reactor. The influent volume can be determined within 30-75% depending on the nature of the wastewater. There are three types of inflow methods: Static Fill, Mixed Fill, and Aerated Fill.

2) React: Reaction period consists of aerobic reaction time supplying oxygen and anaerobic or anoxic reaction time without oxygen supply. During this period, it is possible to simultaneously remove nitrogen and phosphorus as well as organic matter. Generally, the reaction time is set to about 50% or less of the total time within one cycle, and the reaction time is repeated periodically.

3) Settle: This is a step of performing solid-liquid separation from the mixed solution, and has high sedimentation efficiency because there is no influent flow during the sedimentation period. The SBR method directly relates to the improvement of the treatment efficiency because the sedimented sludge without recirculation of the sludge remains as a microorganism necessary for the reaction in the next cycle. In general, the sedimentation time is about 0.5 to 1.5 hours when the load of the influent is not high.

4) Draw: The discharge uses a fixed discharge pump or a floating discharge pump, and various other discharge methods are used. Particularly, in the discharging step, since it is intended to discharge the treated water separated by solid-liquid separation, it is important to stabilize the water quality of the treated water so that the sedimented sludge does not shake.

On the other hand, an apparatus for discharging a supernatant in a continuous batch reactor is often called a decanter. The decanter that is generally used is mostly developed in foreign countries and introduced into the country, or the foreign technology is partially used and modified.

The decanter is located at a predetermined depth on the surface of the water to discharge the supernatant, and a motorized valve is mainly used for opening and closing the discharge pipe. However, the upper water inlet for discharging the supernatant is directed to the surface of the water, and the scum layer is often discharged with the supernatant.

Furthermore, there is a problem in that when the upper water inlet is one, it takes a long time to discharge the supernatant, or when the discharge speed is increased to shorten the discharge time, the sludge or the scum layer is discharged together.

Korean Patent Publication No. 2012-0039784

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for separating sludge from a sludge- The purpose is to provide.

In order to solve the above problems, the apparatus of the present invention for discharging a supernatant includes a supernatant discharging device for discharging the supernatant liquid, which is solid-liquid separated, from the reaction tank 1000 into the reaction tank 1000 of the continuous batch type reaction tank, , Comprising: a buoyant body (100) having a predetermined shape; And a supersonic suction unit 200 connected to the buoyant body 100. The supersonic suction unit 200 includes a suction pipe 210 having one side connected to the suction means and a suction force And an inlet pipe (220) communicating with the suction pipe (210) so as to suck up the supernatant and opening toward the bottom surface of the reaction tank (1000).

In addition, the buoyant body (100) is formed of a closed metal material having three or more hollows surrounding the water suction part (200) and having an empty interior.

The inflow pipe 220 has three or more shapes to surround the suction pipe 210. Each inflow pipe 220 is provided with a check valve 221 so that the supersonic water can move only in one direction, Wherein the sludge inflow prevention plate 300 is larger than an imaginary outer diameter determined by the buoyancy bodies 100 and the sludge inflow prevention plate 300 is located below the inlet The trough 320 having one or more through holes 321 is radially formed to correspond to the shape of the tube 220 and the region other than the trough 320 is closed.

The number of the buoyant bodies (100) is four or more.

Further, the reaction tank 1000 is a continuous batch type reaction tank.

And a distance adjusting unit 110 connecting the buoyant body 100 and the sludge inflow prevention plate 300 so as to adjust a distance between the buoyant body 100 and the sludge inflow prevention plate 300 .

The suction means is composed of a suction pump 213 provided outside the reaction tank 1000 and a suction pipe 211 connecting the suction pump 213 and the suction pipe 210.

According to the present invention, there is an advantage that a buoyancy body made of a plurality of hermetically sealed metallic materials is provided, and a sense of stability can be given to the high-grade water discharge device.

In addition, the apparatus of the present invention includes a plurality of inflow pipes whose openings for sucking up the supernatant are directed downward, so that not only the mixing of the scallop can be minimized, but also the supernatant can be supplied in a large amount It is possible to discharge it.

In addition, the present invention is advantageous in that the sludge inflow prevention plate 300 is provided below the supersonic suction unit, so that inflow of the settling sludge can be minimized.

1 is a cross-sectional view showing a state in which a supersonic discharge device according to an embodiment of the present invention is installed in a reaction tank.
2 is an exploded perspective view of a high-water discharge apparatus according to an embodiment of the present invention.
Fig. 3 is a view of the supersonic suction section viewed from below. Fig.
4 is a top view of the sludge inflow prevention plate.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a high-water discharge apparatus according to the present invention will be described with reference to the accompanying drawings.

The use of the terms "comprises", "having", or "having" in this application is intended to specify the presence of stated features, integers, steps, components, parts, or combinations thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a cross-sectional view showing a state in which a supersonic discharge device according to an embodiment of the present invention is installed in a reaction tank.

As shown in FIG. 1, the supersonic water discharging apparatus of the present invention is placed in a reaction tank 1000 for precipitating and separating a solid material from a liquid such as a continuous batch reactor, a settling tank or a thickener, and a sludge, It is a device for discharging only the ascending water.

That is, the supernatant discharging apparatus according to the present invention is positioned at a predetermined position below the water surface of the reaction tank 1000, and the supernatant is discharged to the outside through the suction means outside the reaction tank 1000. Here, the suction means is not particularly limited as long as the suction means is capable of sucking the supernatant to the outside. For example, one side of the suction pipe 210 is connected to the suction pipe 210 and the other side thereof is connected to the suction pipe 213 And more preferably, a pressure tank 212 may be further provided between the suction pipe 211 and the suction pump 213.

FIG. 2 is an exploded perspective view of a supersonic discharge device according to an embodiment of the present invention, FIG. 3 is a view of the supersonic suction portion, and FIG. 4 is a top view of the sludge inflow prevention plate.

2 to 4, the supersonic water discharge apparatus of the present invention includes a buoyant body 100 having a predetermined shape, a supersonic suction unit 200 connected to the buoyant body 100, and a sludge inflow prevention plate 300).

The buoyant body 100 is physically connected to the supernatant suction unit 200 and the sludge inflow prevention plate 300. The supersonic suction unit 200 and the sludge inflow prevention plate 300 And can be located at a predetermined position of the reaction tank 1000, more specifically, between the water surface and the sedimentation sludge layer.

That is, when the precipitation process is completed in the reaction tank 1000 and the discharge of the supernatant is required, the buoyant body 100 should be lowered into the water while being connected to the wire 400, It should be held for a predetermined time in a spaced apart state.

 Therefore, the buoyant body 100 preferably has a predetermined buoyancy so as to reduce the load on the driving motor 500 that unwinds and winds the wire 400 and the wire 400, And more preferably four or more in a shape that surrounds the supersonic suction unit 200.

Conventional buoyant bodies, such as plastics or foams, are placed on the surface of the supernatant with a too low specific gravity, so that the supercritical fluid (200), which is connected to the buoyant body (100) There is a possibility of discarding.

On the contrary, when the buoyant body 100 is formed of a closed metal material as in the present invention, due to the high specific gravity of the metal material itself and the air in the closed space portion, It is possible to solve the above problems and provide a sense of stability to the supersonic discharge device including the supersonic suction part 200 connected to the buoyant body 100 and the sludge inflow prevention plate 300.

Particularly, when the four buoyancy bodies 100 are positioned and spaced apart from each other by a predetermined distance so that the water intake portion 200 can be located at an intermediate position, the stability can be further improved. 2 and 3 show that the buoyant body 100 has four hexahedron bodies, the buoyant body 100 may be a buoyant body 100 such as a cylinder, a pentagon having a triangular section, a pentagon having a pentagon, It is obvious that the outer shape of the buoyant body 100 can be changed and it is not particularly limited as long as the buoyant body 100 has three or more structures, for example, three, five, six, etc.,

The supersonic suction unit 200 includes a suction pipe 210 and an inlet pipe 220 and is fixed to the inner side of the buoyant body 100 while being positioned between the buoyant bodies 100 of three or more.

Specifically, one side of the suction pipe 210 is opened toward the bottom surface of the reaction tank 1000 so that a negative pressure can be formed between the suction pipe 210 and the inflow pipe 220, or inside the inflow pipe 220, Is connected to the suction pipe (211) connected to the suction pump (213), and the other side is connected to the inflow pipe (220).

As described above, the inlet pipe 220 communicates with the suction pipe 210 at one side, and is opened at the other side to suck up the supernatant by a negative pressure. It is preferable that the other opening of the inflow pipe 220 is positioned to face the bottom surface of the reaction tank 1000 like the suction pipe 210 and it is more preferable that the other opening is provided in the shape of wrapping the suction pipe 210.

The sedimentation sludge gathered at the bottom of the reaction tank 1000 is comparatively well-sedimented, but there is a scum layer which is very badly sedimented near the water surface. Therefore, when the opening of the inflow pipe 220 is located upward, that is, in the water surface direction, it is preferable to induce the inflow of the supernatant water from the side and the bottom of the inflow pipe 220 as much as possible, Do.

Since the conventional supersonic discharge device is composed of a single inflow pipe, there is a limit to the discharge of the supersonic water, or it is frequently discharged by mixing the supercritical water with the scum layer. Specifically, in the case of one inlet pipe, the cross-sectional area of the inlet pipe must be large in order to suck and discharge a large amount of water. Therefore, if the decanter is raised or lowered carefully, it may damage the device. When the cross-sectional area of the inflow pipe is small, it is possible to increase the flow rate of the supernatant flowing into the inflow pipe to discharge a large amount of supernatant. However, there is a possibility that the scum layer or the sedimentation sludge may be sucked together due to the increase of the flow velocity.

In contrast, in the present invention, four inlet pipes 220 are provided so as to surround the suction pipe 210, so that the upper water introduced into the suction pipe 210 is divided and sucked. Therefore, the decanter operation It is possible to suppress the stability of the time and the inflow of the scum layer and the settling sludge.

Specifically, as shown in FIGS. 2 and 3, the suction pipe 210 is located at the center, and the four suction pipes 220 are positioned so as to surround the suction pipe 210 at the center. Therefore, even if the cross-sectional area of each inflow pipe 220 is small, the supersonic water simultaneously flows into the four inflow pipes 220, so that it is possible to discharge a large amount of the supernatant even if the flow rate of the inflow water to the inflow pipe 220 is kept low. And the four inlet pipes 220 are located at the periphery of the suction pipe 210, which is advantageous in terms of structural stability.

Next, it is preferable that a check valve 221 is provided at a predetermined position in each inflow pipe 220, more specifically, near the inlet, so that the supersonic water can flow only in one direction. The check valve 221 provided in the inflow pipe 220 is filled with a supernatant in a space portion leading to the suction pipe 210 and the suction pipe 211. In the case where the discharge of the supersonic water is temporarily stopped and then the discharge is induced again, So that the supersonic water can be quickly discharged again and the failure rate of the suction pump 213 can be lowered.

A sludge inflow prevention plate 300 may be further provided under the buoyant body 100. The sludge inflow prevention plate 300 is for restraining the sediment sludge collected at the bottom of the reaction tank 1000 from flowing into the supersonic suction unit 200.

2, which is an exploded perspective view of the supernatant discharging device, and FIG. 4, which is a top view of the sludge inflow preventing plate, the sludge inflow preventing plate 300 is connected to the buoyant body 100 through the distance adjusting part 110, And may be somewhat larger than a virtual outer diameter determined by the buoyancy bodies 100. [0054]

In the vicinity of the center, an opening 310 for passing the suction pipe 211 is provided. A tread 320 having one or more through holes 321 is radially formed so as to correspond to a predetermined area, more specifically, a shape in which the inflow pipe 220 is installed, It is closed.

According to the sludge inflow prevention plate 300 having the above-described structure, the inflow of the sludge from the downside can be blocked by the closed region, which is a region other than the trough 320, Since water can pass through the tread 320, it is possible to suppress the occurrence of turbulent flow during the ascending and descending of the discharge device. In addition, the sludge inflow prevention plate 300 is located below the supernatant suction unit 200 and includes a closed region. The sludge inflow prevention plate 300 minimizes the inflow of the supernatant from the downward direction close to the sludge layer, Which is between the sludge inflow prevention plate 300 and the buoyant body 100 formed by the sludge inflow prevention plate 300 and the sludge inflow prevention plate 300. As a result, the inflow from the upper portion close to the precipitation sludge layer is minimized while the inflow from the upper portion close to the scum layer is minimized, and the upper portion of the side portion relatively away from the scum layer or the sedimentation sludge layer flows into the inflow pipe 220 ), So that scum or sludge can be minimally mixed.

On the other hand, the edge of the sludge inflow prevention plate 300 is preferably provided with a bent portion 330 bent at a predetermined angle, more specifically, less than 90 degrees. When the edge of the sludge inflow prevention plate 300 is bent at a predetermined angle, the turbulence of water caused by the sludge inflow prevention plate 300 at the time of lowering the discharge device can be suppressed as much as possible and the lateral inflow of the supersonic water can be performed more smoothly have.

2 to 4, the rudder 320 is formed in a '+' shape, but it is obvious that the installation position of the rudder 320 may be changed according to the number of the inflow pipes 220 and the installation structure .

The distance adjusting unit 110 is provided with a bolt and a nut so as to adjust a distance between the sludge inflow prevention plate 300 and the buoyant body 100, in addition to the function of connecting the sludge inflow prevention plate 300 and the buoyant body 100. [ Structure can be adopted.

For example, when the sedimentation is bad and the depth of the upper water layer is not deep, the separation distance between the inflow preventing plate 300 and the buoyant body 100 may be narrowed so that mixing of the sedimentation sludge layer is minimized.

Hereinafter, a method for discharging the supernatant using the supernatant discharging apparatus of the present invention having the above-described structure will be described.

For example, when the present invention is applied to a continuous batch reactor in which a sewage inflow step, an anaerobic reaction step, an exhalation reaction step, a precipitation step and an evacuation step are sequentially performed in one reaction tank, the inflow step, anaerobic reaction step, exhalation reaction step, The wire 400 connected to the buoyant body 100 is wound around the driving motor 500 and fixed at a predetermined position on the water surface.

After the sedimentation step is completed, the discharge device is slowly lowered by the drive motor 500 so as to reach a predetermined position below the scale layer. When the discharging device reaches the set position, the suction pump 213 outside the reaction tank 1000 operates to discharge the supernatant.

At this time, it is possible to determine the position of the supersonic suction unit 200 so as to suck up the supersonic water at a predetermined position from the surface of the water by using the buoyant force and the self weight of the ejection apparatus, and to determine the withdrawal length of the drive motor 500 and the wire 400 The position of the supersonic suction unit 200 may be determined.

Having thus described a particular portion of the present invention in detail, those skilled in the art will appreciate that these specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby, It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the invention, and that such modifications and variations are intended to fall within the scope of the appended claims.

100: Buoyant body
110:
200: Upper suction unit
210: suction pipe
211: suction piping 212: pressure tank
213: Suction pump
220: inlet pipe
221: Check valve
300: sludge inflow plate
310: opening
320:
321: Through the hole
330:
400: wire
500: drive motor
1000: Reactor
S: sludge layer

Claims (7)

1. A supernatant discharging device for discharging a supernatant liquid inside a reaction tank (1000) of a continuous batch reactor, a settling tank or a thickener,
A buoyancy body (100) having a predetermined shape; And
And a supersonic suction unit (200) connected to the buoyant body (100)
The upper water suction unit 200 communicates with the suction pipe 210 in which one side is connected to the suction unit and the suction pipe 210 so that the upper water is sucked by the suction force by the suction unit, Includes an inlet pipe (220) open,
The buoyant body (100) is formed of a closed metal material having three or more openings that surround the supersonic suction unit (200)
The inlet pipe 220 has three or more shapes to surround the suction pipe 210. Each inlet pipe 220 is provided with a check valve 221 so that the upper water can be moved only in one direction,
The sludge inflow prevention plate 300 further includes a sludge inflow prevention plate 300 located below the buoyant body 100 and spaced apart from the sludge inflow prevention plate 300 by a predetermined distance, A trough 320 having one or more through holes 321 is formed in a radial direction and a region other than the trough 320 is closed so as to correspond to the shape in which the inflow pipe 220 is installed The upper water discharge device.
delete delete The method according to claim 1,
Characterized in that the buoyant body (100) has four or more.
The method according to claim 1,
Wherein the reaction tank (1000) is a continuous batch type reaction tank.
The method according to claim 1,
And a distance adjusting unit 110 connecting the buoyant body 100 and the sludge inflow prevention plate 300 so as to adjust a distance between the buoyant body 100 and the sludge inflow prevention plate 300 Characterized by an upper water discharge device.
The method according to claim 1,
Characterized in that the suction means comprises a suction pump (213) provided outside the reaction tank (1000) and a suction pipe (211) connecting the suction pump (213) and the suction pipe (210).

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