KR101678993B1 - Apparutus for flocculating and thickening sludge - Google Patents

Abstract

The present invention provides an apparatus for flocculating and thickening sludge, the apparatus comprising: an inner container which has an inner space configured to be provided as an elevation route for entering slug and an entering coagulant, has an outside screen, configured to pass a filtrate of slug, elevated along the inner space, therethrough, in a section of a side surface, and has a discharge conduit, configured to discharge the slug elevated along the outside screen, at an upper end of the side surface; an agitator which is provided to be rotated in an inner space of the inner container, and elevates the slug and the coagulant, introduced into the inner space of the inner container during rotation, while agitating the slug and the coagulant; an outer container which accommodates the inner container therein, allows the discharge conduit to pass therethrough, is connected to an inlet conduit configured to introduce the slug and the coagulant into the inner space of the inner container, and is connected to an external discharge conduit configured to drain the filtrate that drops after having passed through the outside screen; a washing ring which is located between the outer container and the inner container, is provided to surround the inner container, and has a plurality of spray nozzles configured to spray a washing fluid toward an outside surface of the inner container; and an elevation means which is coupled to the outer container, and selectively elevates and lowers the washing ring between upper and lower ends of the screen.

Description

[0001] APPARATUS FOR FLOCCULATING AND THICKENING SLUDGE [0002]

The present invention relates to a sludge agglomeration and concentration apparatus, and more particularly, to a sludge agglomeration and concentration apparatus capable of simultaneously performing agglomeration of sludge by agitating sludge and flocculant and concentration of agglomerated sludge.

At present, the sewage discharged from homes and factories is sent to the sewage treatment plant and processed. The sewage treatment process includes a purification process and a sludge treatment process. In the purification process, the sewage is purified to a range where the self-purification of the river can be activated and discharged to a public water such as a river. In the sludge treatment process, The sludge is treated through processes such as concentration and dehydration.

The sludge concentration apparatus used in the concentration process of the sludge is a device for primarily removing the filtrate from the sludge to be dehydrated in the subsequent process. Such a sludge concentration apparatus can be roughly divided into a gravity type concentration apparatus and a mechanical concentration apparatus. Most of the domestic sewage treatment plants are equipped with gravity type concentration devices, but more and more applications of mechanical concentration devices are increasing.

On the other hand, if the flocculated sludge formed by stirring with the flocculant is concentrated, the concentration efficiency can be increased as compared with the case without such flocculant sludge. Therefore, it is preferable to stir the sludge to be concentrated with the flocculant to make flocculated sludge. In this case, the flocculant sludge prepared by preliminarily agitating the sludge with the flocculant may be introduced into the mechanical concentration apparatus, the sludge and flocculant may be introduced together with the mechanical concentration apparatus, And enrichment.

A mechanical sludge agglomeration and concentration apparatus for simultaneously carrying out agglomerating sludge agitation by agitating agglomerating agent and sludge and concentrating agglomerated sludge is disclosed in Korean Patent No. 10-0963881 (unified dehydration and concentration type agglomeration apparatus) . In this technique, the sludge and flocculant supplied to the bottom of the inner vessel are raised inside the inner vessel by the rotation of the agitator. Since the screen is installed in the upper section of the inner vessel, when the sludge is stirred with the flocculant and reaches the section where the screen is installed, the filtrate of the sludge is discharged to the outside through the screen. The sludge separated from the filtrate, that is, the concentrated sludge, rises without passing through the screen, and is discharged to the upper outlet of the outer container provided outside the inner container.

Similar techniques to Korean registered patents are disclosed in Korean Patent No. 10-0707282 (Sludge Concentration Device), Korean Patent No. 10-1259891 (Multiple Disc Sludge Concentration Device) and Korean Patent No. 10-0740608 (Coagulation, Concentrated and centrifugal dehydrator).

Korean Patent No. 10-0963881 (unified dehydration and concentration type flocculation reaction apparatus) Korean Patent No. 10-0707282 (sludge concentration apparatus) Korean Patent No. 10-1259891 (multi-disk type sludge concentration apparatus) Korean Patent No. 10-0740608 (coagulation, concentration and centrifugal dehydration apparatus)

In Korean Patent No. 10-0963881 (unified dewatering and concentration type flocculation reactor), the filtrate passes through the screen while the flocculation sludge is rising. When this process is repeated, the screen is clogged by the sludge . In order to prevent this, Korean Patent No. 10-0963881 (unified dewatering and concentration type flocculation apparatus) scrape the inner surface of the screen. However, even though the solidified sludge on the outer surface of the screen is not removed, The passage of the screen is obstructed, and the concentration efficiency of the sludge is lowered. Therefore, the present invention aims to provide a technique capable of solving such a problem.

In addition, in Korean Patent No. 10-0963881 (unified dehydration and concentration type flocculation reactor), all the blades of the stirrer are rotated at the same speed, so that the flocs generated in the sludge by the stirring of the lower blades, A collapse phenomenon may occur. The concentrated sludge is directly introduced into the dehydration apparatus and dehydrated. When the flocs in the concentrated sludge collapse in the concentration process, the dehydration efficiency is lowered in the dehydration process as a subsequent procedure. Therefore, the present invention also provides a technique for solving such a problem.

In Korean Patent No. 10-0963881 (unified dewatering and concentration type flocculation reaction apparatus), a screen for passing the filtrate is provided only in the upper section of the inner vessel, which has limitations in improving the concentration efficiency. Therefore, the present invention also provides a technique for solving such a problem.

The present invention relates to a sludge treatment apparatus which has an inner space provided with an ascending path of an introduced sludge and a flocculating agent and has an outer screen at a portion of a side surface for passing a filtrate of sludge rising along the inner space, An inner tube having a discharge pipe for discharging the inner tube at a side upper end; An agitator which is provided so as to be able to rotate in the inner space of the inner cylinder and lifts the sludge and the coagulant introduced into the inner space of the inner cylinder while rotating while stirring; And a drain pipe connected to the drain pipe for passing the sludge and the flocculant into the inner space of the inner pipe and draining the filtrate dropped after passing through the outer screen, An outer tube connected to an external drain pipe; A cleaning ring disposed between the outer cylinder and the inner cylinder to surround the inner cylinder and having a plurality of injection nozzles for injecting the cleaning fluid toward the outer surface of the inner cylinder; And an elevating means coupled to the outer tube for moving the cleaning ring between upper and lower ends of the screen.

The stirrer includes: an outer rotating shaft extending through a center of the inner tube to a lower portion of the outer screen; A plurality of upper blades provided to rotate together with the outer rotation shaft and positioned between upper and lower ends of the outer screen; An inner rotating shaft extending through the outer rotating shaft and extending to the bottom of the outer tube, and being rotatable independently from the outer rotating shaft; And a plurality of lower blades fixed to the inner rotation shaft and positioned below the outer screen.

Wherein the sludge agglomerating and concentration apparatus includes an inner screen that surrounds the outer rotation shaft to allow rotation of the outer rotation shaft and extends from an upper portion of the outer screen to a lower portion of the outer screen; And an internal drain pipe extending from the lower end of the inner screen to the inside of the outer cylinder through a side surface of the inner cylinder.

The sludge agglomerating and concentrating apparatus may further include: a connecting member fixed to the outer rotating shaft so as to extend laterally at an upper portion of the outer screen; An inner scraper fixed to the connecting member to be positioned adjacent to the inner screen and having a brush in contact with an outer surface of the inner screen and fixedly supporting the plurality of upper wings; And an outer scraper fixed to the connecting member so as to be positioned adjacent to the outer screen and having a brush that contacts the inner surface of the outer screen.

According to the present invention, the sludge adhering to the outer surface of the outer screen can be removed by the cleaning fluid.

According to the present invention, since the upper blade and the lower blade can rotate at different speeds, the sludge can be agitated rapidly at the position where the lower blade is located, and at the position where the upper blade is located, it is possible to concentrate the sludge while preventing floc disruption as much as possible.

Further, according to the present invention, since the filtrate of the sludge is drained not only through the outer screen but also through the inner screen, it is possible to achieve a better concentration efficiency than when only the outer screen is provided or only the inner screen is provided.

1 is a perspective view showing a sludge agglomeration and concentration apparatus according to the present invention.
FIG. 2 is a partially cutaway perspective view showing the inside of the outer cylinder of the sludge agglomerating and concentration apparatus shown in FIG. 1; FIG.

Hereinafter, preferred embodiments of a sludge agglomerating and concentration apparatus according to the present invention will be described in detail with reference to the drawings. It is to be understood that the terminology or words used herein are not to be construed in an ordinary sense or a dictionary, and that the inventor can properly define the concept of a term to describe its invention in the best possible way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

≪ Embodiment 1 >

1 and 2, the sludge agglomerating and concentration apparatus 100 according to the first embodiment of the present invention includes an outer cylinder 130, an inner cylinder 110, a stirrer, an inner screen 164, A scraper 182, 184, a cleaning ring 150, and a lifting means 154.

The outer cylinder 130 has a cylindrical shape. At the bottom of the outer cylinder 130, an inflow pipe 136 for introducing sludge and coagulant is provided. An outer drain pipe 132 for discharging the filtrate separated from the sludge when the sludge is concentrated is provided at the lower side of the outer cylinder 130. And a discharge pipe 116 for discharging the concentrated sludge, that is, the concentrated sludge, is provided at the upper side of the side surface of the outer cylinder 130. The concentrated sludge discharged to the discharge pipe 116 is supplied to a dehydrator and subjected to a dehydration process.

The inner cylinder 110 has a cylindrical shape and is accommodated in the outer cylinder 130. The inner cylinder 110 is fixed to the bottom of the outer cylinder 130, and its bottom is clogged with the bottom of the outer cylinder 130. The inner tube 110 has an inner space 112 into which sludge and coagulant supplied along the inflow pipe 130 are introduced. When the agitator is rotated, the sludge agglomerates and rises in the upper internal space 112 while rotating.

The side surface of the inner tube 110 is divided into three sections. The lowermost section is clogged and the uppermost section is blocked. And an outer screen 114 is provided between the lower section and the upper section. The outer screen 114 is provided so as to pass the filtrate but hardly pass the sludge. Thus, while the sludge is rotating and rising, the filtrate of the sludge is drained to the outside of the inner cylinder 110 through the outer screen 114. The drained filtrate drops in a space between the outer cylinder 130 and the inner cylinder 110 and then drained to the outside of the outer cylinder 130 through the outer drain pipe 132. When the sludge which has risen through the outer screen 114 reaches the upper section of the inner tube 110 side, the upper end of the outer tube 114 is connected to the outer tube 116 130, respectively.

The stirrer is rotatable in an inner space 112 of the inner cylinder 110. When the agitator is rotated, the sludge and the coagulant introduced into the inner space 112 of the inner cylinder 110 are also rotated in the same direction. At this time, the sludge agitates and agglomerates with the coagulant, and floc is formed in the sludge .

Such an agitator includes an outer rotation shaft 160, a plurality of upper wings 162, an inner rotation shaft 170, and a plurality of lower wings 172.

The outer rotating shaft 160 extends upward and downward through the center of the inner cylinder 110. The upper end of the outer rotating shaft 160 protrudes above the upper surface of the outer cylinder 130 and the lower end thereof is slightly below the lower end of the outer screen 114 Located. The outer rotation shaft 160 is coupled to the upper surface of the outer cylinder 130 and the upper surface of the inner cylinder 110 via a bearing (not shown). The upper end of the outer rotary shaft 160 is coupled to a driving shaft of a motor 164 fixed to the upper surface of the outer cylinder 130 by a bracket (not shown). Accordingly, when the motor 164 is operated, the outer rotation shaft 160 rotates.

The plurality of upper blades 162 are positioned between the upper and lower ends of the outer screen 114 and are provided to rotate together with the outer rotation shaft 160. To this end, a pair of connecting members 180 and a pair of inner scrapers 182 are provided. The connecting members 180 are located in the inner space 112 of the inner tube 110, but higher than the upper end of the outer screen 114. Also, the connecting members 180 are spaced 180 degrees apart and extend transversely. The inner scrapers 182 are fixed to the connecting members 180 in a vertically extending posture in which the upper wings 162 are fixed to the inner scrapers 182. Therefore, when the outer rotary shaft 160 rotates, the connecting member 180 and the inner scraper 182 rotate, and at this time, the upper blade 162 also rotates. Meanwhile, the inner scraper 182 also functions to scrape off the sludge on the outer surface of the inner screen 164, in addition to supporting the upper blade, which will be described in detail below.

The upper end of the inner rotation shaft 170 protrudes upward from the upper surface of the outer rotation shaft 160. The lower end of the inner rotation shaft 170 is connected to the bottom of the outer cylinder 130 and a bearing City). A bearing is interposed between the inner rotary shaft 170 and the outer rotary shaft 160. The upper end of the inner rotary shaft 170 is coupled to a driving shaft of another motor 174 fixed to the upper surface of the outer cylinder 130 by a bracket (not shown). Accordingly, when the motor 174 is operated, the inner rotary shaft 160 rotates separately from the outer rotary shaft 160.

The plurality of lower vanes 172 are fixed to the inner rotary shaft 170 and are located at the lower portion of the outer screen 114. When the inner rotation shaft 170 rotates, the lower blade 172 rotates under the outer screen 114.

According to the stirrer as described above, the upper blades 162 positioned between the upper and lower ends of the outer screen 114 and the lower blades 172 positioned at the lower portion of the outer screen 114 can rotate at different speeds . In the lower space of the outer screen 114, the lower wings 172 are rapidly rotated (for example, 60 rpm) so that the agglomeration of the sludge proceeds rapidly. In the space between the upper and lower ends of the outer screen 114, ) Can be rotated slowly (e.g., 20 rpm) to concentrate the sludge while preventing the floc from collapsing. If the upper wings 162 also rotate as fast as the lower wings 172, the flocs on the sludge at the bottom of the outer screen 114 may collapse while passing through the outer screen 114, The dehydration efficiency is lowered in the dehydration process. However, according to the present invention, the rotation speed of the upper blades 162 can be controlled to be slower than the rotation speed of the lower blades 172 as described above, thereby preventing the problem of lowering the dehydration efficiency in the dehydration process.

The inner screen 164 has a cylindrical shape extending from slightly above the top of the outer screen 114 to slightly below the bottom of the outer screen 114. The upper and lower surfaces of the inner screen 164 have a disk shape and are supported by the outer rotation shaft 160 via bearings (not shown). Thus, the inner screen 164 allows rotation of the outer rotation shaft 160.

Like the outer screen 114, the side surface of the inner screen 164 is provided so as to pass the filtrate but hardly pass the sludge. Thus, while the sludge is rotating and rising, the filtrate of the sludge passes through the inner screen 164 and into the interior of the inner screen 164.

An inner drain pipe 164a is coupled to the lower surface of the inner screen 164. The inner drain pipe 164a extends to the inside of the outer cylinder 130 through the side face of the inner cylinder 110. [ Therefore, the inner screen 164 does not rotate and remains stationary even when the outer rotary shaft 160 rotates. The filtrate flowing into the inner screen 164 moves to the space between the inner tube 110 and the outer tube 130 through the inner drain pipe 164a and then drops down through the outer drain pipe 132 to the outside of the outer tube 130 Drained to the outside.

The inner screen 164 may be supported by a support plate (not shown). In this case, the support plate (not shown) extends in the transverse direction while passing between the two inner drain pipes 164a, and both ends of the support plate (not shown) are fixed to the inner surface of the inner tube 110. Further, the outer rotating shaft 160 passes through a supporting plate (not shown) via a bearing, and the lower surface of the inner screen 164 is fixed to a supporting plate (not shown).

The filtrate of the sludge that rotates in the inner space 112 of the inner tube 110 and flows up through the inner screen 164 as well as the outer screen 114, It can be drained. Therefore, in the present invention, the concentration efficiency of the sludge is better than that of the prior art in which only the outer screen is provided or only the inner screen is provided.

On the other hand, the sludge that rotates and rises in the inner space 112 of the inner tube 110 causes clogging of the outer screen 114 and the inner screen 164, and the drainage of the filtrate is not performed smoothly, . In order to prevent this, an inner scraper 182 and an outer scraper 184 are provided in the inner space 112 of the inner cylinder 110.

The inner scraper 182 has an upper end fixed to the connecting member 180 and extends downward to be located adjacent to the inner screen 164. Accordingly, when the outer rotary shaft 160 rotates, the inner scraper 182 also rotates. The inner scraper 182 is provided with a brush 182a that is in contact with the outer surface of the inner screen 164. Thus, when the inner scraper 182 is rotated, the outer surface of the inner screen 164 is cleaned by the brush 182a.

The outer scraper 184 also has a top secured to the connecting member 180. Therefore, when the outer rotary shaft 160 rotates, the outer scraper 184 also rotates. The outer scraper 184 is located further outward than the inner scraper 182 and extends downwardly adjacent the outer screen 114 and has a brush 184a that contacts the inner surface of the outer screen 114. Thus, when the outer scraper 184 is rotated, the inner surface of the outer screen 114 is cleaned by the brush 184a.

The cleaning ring 150 is for removing sludge on the outer surface of the outer screen 114 and has a ring shape. The cleaning ring 150 is disposed in a space between the outer cylinder 130 and the inner cylinder 110 and is provided to surround the inner cylinder 110. A plurality of spray nozzles 152 are provided on the inner surface of the cleaning ring 150. These injection nozzles 152 are arranged at regular intervals along the circumferential direction of the cleaning ring 150. The cleaning ring 150 is also connected to a hose (not shown) for supplying the cleaning fluid. The cleaning fluid supplied through the hose to the cleaning ring 150 is ejected from the injection nozzle 152 onto the outer surface of the outer screen 114. The cleaning fluid may be air or water.

The cleaning ring 150 is lifted up and down by the lifting means 154 at this time the lifting means 154 is controlled to raise and lower the cleaning ring 150 between the upper and lower ends of the outer screen 114. Further, the elevating means 154 is controlled (for example, once every three hours) to be operated only at predetermined time points, and is controlled so as to be elevated by a predetermined number of times within a predetermined time (for example, five times for five minutes). As the elevating means 154, a cylinder may be used as shown. In this case, the cylinder 154 is mounted on the upper surface of the outer cylinder 130, and the rod 154a of the cylinder liner 154 is fixed to the cleaning ring 150. As the elevating means 154, a jack screw, a rack-pinion, or the like may be used.

Although the outer screen 114 is provided so as to hardly pass the sludge, it does not completely prevent the passage of the sludge. Therefore, when the concentration process proceeds, the sludge in the inner space 112 of the inner tube 110 passes through the outer screen 114 and is buried on the outer surface thereof. If the sludge adhered to the outer surface of the outer screen 114 is hardened, the filtrate can not pass smoothly and the concentration efficiency is lowered. However, when the cleaning ring 150 and the lifting means 154 are provided as in the present invention, the cleaning fluid is periodically sprayed to the outer surface of the outer screen 114, and the outer surface of the outer screen 114 is washed. .

Hereinafter, the operation of the sludge flocculation and concentration apparatus 100 will be described.

When the sludge and the flocculant are supplied to the inflow pipe 136 in a state where the two motors 164 and 174 are operated, the sludge and the flocculant flow into the inner space 112 of the inner cylinder 110, . At the beginning of the rise, the sludge is rapidly agitated while rotating relatively fast by the lower vane 172. Then, when the sludge reaches the section where the screens 114 and 164 are located, the sludge is relatively slowly rotated by the upper vane 162, and the filtrate of the sludge falls through the screens 114 and 164, (132). Thereafter, the sludge continues to rise and then flows into the discharge pipe 116.

During this process, the scrapers 182 and 184 wipe the surfaces of the screens 114 and 164 while rotating with the upper wings 162, and the cleaning ring 150 is moved up and down along the outer screen 114 ). ≪ / RTI >

≪ Embodiment 2 >

In the second embodiment of the present invention, the inner screen 164 of the first embodiment is omitted. Therefore, in the present embodiment, the inner scraper 182 and the brush 182a are not provided, and the upper blade 162 is fixed to the outer rotation shaft 160. [ The remaining configuration is the same as that of the first embodiment, and a description thereof will be omitted.

According to the present embodiment, the effect that the filtrate of the sludge is drained through the inner screen 164 does not occur, but the effect that the upper vane 162 and the lower vane 172 can rotate at different speeds, The effect that the outer surface of the cleaning blade 114 is cleaned by the cleaning fluid still occurs.

≪ Third Embodiment >

In the third embodiment of the present invention, the inner screen 164 and the outer rotation shaft 160 of the first embodiment are omitted. Therefore, in this embodiment, the inner scraper 182 and the brush 182a are not provided, and the motor 164 for rotating the outer rotation shaft 160 is not provided. Also, in this embodiment, the connecting member 180 and the upper blade 162 are fixed to the inner rotating shaft 170. The remaining configuration is the same as that of the first embodiment.

According to the present embodiment, the effect that the sludge filtrate is drained through the inner screen 164 and the effect that the upper vane 162 and the lower vane 172 can rotate at different speeds does not occur, The effect that the outer surface of the cleaning blade 114 is cleaned by the cleaning fluid still occurs.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

100: sludge agglomeration and concentration apparatus 110: inner cylinder
112: inner cylinder inner space 114: outer screen
116: discharge pipe 130: outer tube
132: External drain pipe 136: Inflow pipe
150: cleaning ring 152: spray nozzle
154: lifting means 160: outer rotating shaft
162: upper blade 164: inner screen
164a: Internal drain pipe 170: Inner rotary shaft
172: lower blade 180: connecting member
182: inner scraper 184: outer scraper
182a, 184a: Brush

Claims (4)

The sludge having an inner space provided with a rising path of the introduced sludge and the flocculant and having an outer screen at a part of the side surface for passing the filtrate of the sludge rising along the inner space, An inner tube having a discharge pipe at a side upper end;
And a drain pipe connected to the drain pipe for passing the sludge and the flocculant into the inner space of the inner pipe and draining the filtrate dropped after passing through the outer screen, An outer tube connected to an external drain pipe;
A plurality of upper blades extending through the center of the inner tube and extending to a lower portion of the outer screen, and a plurality of upper blades arranged to rotate together with the outer rotation shaft between upper and lower ends of the outer screen; And a plurality of lower vanes fixed to the inner rotary shaft so as to be positioned below the outer screen, wherein the inner rotary shaft rotates separately from the outer rotary shaft;
An inner screen that surrounds the outer rotation shaft to allow rotation of the outer rotation shaft and extends from an upper portion of the outer screen to a lower portion of the outer screen; And
And an internal drain pipe extending from a lower end of the inner screen to a side of the inner cylinder and extending to the inside of the outer cylinder. The method according to claim 1,
A cleaning ring disposed between the outer cylinder and the inner cylinder to surround the inner cylinder and having a plurality of injection nozzles for injecting the cleaning fluid toward the outer surface of the inner cylinder; And
And an elevating means coupled to the outer tube for moving the cleaning ring between upper and lower ends of the screen. delete The method according to claim 1,
A connection member fixed to the outer rotation shaft so as to extend in a lateral direction at an upper portion of the outer screen;
An inner scraper fixed to the connecting member to be positioned adjacent to the inner screen and having a brush in contact with an outer surface of the inner screen and fixedly supporting the plurality of upper wings; And
And an outer scraper secured to the connecting member to be adjacent to the outer screen and having a brush in contact with an inner surface of the outer screen.

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