KR101572057B1

KR101572057B1 - Solubilizaton and reduction system for organic waste

Info

Publication number: KR101572057B1
Application number: KR1020150059801A
Authority: KR
Inventors: 송태규; 허권무
Original assignee: (주)동일캔바스엔지니어링
Priority date: 2015-04-28
Filing date: 2015-04-28
Publication date: 2015-11-25

Abstract

The present invention relates to a concentrator for concentrating excess sludge, which is an organic waste discharged from a secondary settling tank in a sewage treatment process; A rapid circulation / solubilization device for solubilizing the concentrated sludge discharged from the concentrator; A digester for extinguishing the sludge discharged from the solubilization apparatus; A primary dehydrator for dehydrating the extinguished sludge discharged from the digester; And a horizontally conveyed electroosmotic dehydrator for dewatering the sludge cake discharged from the primary dehydrator to a secondary level.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic waste treatment system,

The present invention relates to an organic waste treatment system, and more particularly, to an organic waste treatment system that treats excess sludge, which is an organic waste generated in a sewage treatment process, through a solubilization process, a digestion process, and a dehydration process.

At present, the sewage discharged from homes and factories is sent to the sewage treatment plant and processed. The sewage treatment process includes the purification process and the sludge treatment process. In the purification process, the sewage is purified to the extent that the midnight effect of the stream can be triggered, and then discharged to a public water area such as a river. In the process of sludge treatment, the organic wastes (raw sludge and excess sludge) generated in the purification process are treated through the concentration process, the solubilization process, the digestion process and the dehydration process.

In the concentration process, the sludge is concentrated by gravity or centrifugal separation. Through this process, the sludge is separated into concentrated sludge and filtrate. The solubilization process is a process of destroying the organic substances contained in the concentrated sludge. When the concentrated sludge passes through the solubilization process and then flows into the digestion process as a subsequent process, the digestion efficiency can be expected to be improved. In the digestion process, the solubilized sludge is stabilized by a method such as anaerobic digestion or aerobic digestion to obtain digested sludge. During the digestion process, the organic matter of the solubilized sludge is decomposed. In the dehydration process, the digested sludge is dehydrated by a dehydrator such as a belt press, a filter press, or the like to become a sludge cake. The sludge cake is finally treated by a method such as landfill or incineration.

An example of a technique for treating such organic wastes is disclosed in Korean Patent No. 10-0669196 (mechanical pretreatment, a method of reducing sewage sludge using an aerobic digestion and a metal catalyst and ozone oxidation).

Korean Patent No. 10-0669196 (mechanical pretreatment, aerobic digestion and method of reducing sewage sludge using metal catalyst and ozone oxidation)

An object of the present invention is to provide an organic waste treatment system for treating excess sludge which is an organic waste generated in a sewage treatment process.

The rapid circulation and solubilization apparatus includes an inner drum which receives the concentrated sludge from a lower end thereof and discharges the concentrated sludge through an open top surface and accommodates a plurality of beads for applying a physical impact to the concentrated sludge in an inner space; A screen drum having an open bottom and coupled to an upper end of the inner drum, the screen drum having a sidewall through which the sludge in the inner drum passes but does not pass the bead; A rotating shaft installed to penetrate the screen drum and the inner drum and rotated by a motor; A plurality of pegs provided on the rotary shaft so as to be positioned in an inner space of the inner drum; And an outer drum having a sludge discharge pipe at the lower end thereof for discharging the sludge that is accommodated therein, the sludge being capable of receiving the sludge passed through the screen of the screen drum.

An elastic pad is coupled to the inner surface of the inner drum.

A plurality of hubs arranged in a vertical direction are fixed to the rotary shaft, and the peg is fixed to the hub in such a manner that the pegs are arranged along the rotational direction of the rotary shaft. At this time, the peg extends outward from the hub, and is inclined to extend in a direction opposite to the rotation direction of the rotation shaft.

The rapid circulation and solubilization apparatus includes a plurality of scrapers. The plurality of scrapers are installed on the rotating shaft so as to be located in the inner space of the screen drum, and scrape off the foreign substance stuck to the screen of the screen drum.

The plurality of scrapers are fixed to a pair of half-side hubs which pressably press the rotary shaft and are detachably coupled to each other. The half-hub has an insertion groove into which the rotary shaft is inserted and two planes located on both sides of the insertion groove. One of the two planes has a bolt hole and the other has a bolt fastening groove.

The outer drum is provided to receive the inner drum and the screen drum away from the inner drum and the screen drum. Alternatively, the outer drum may be detachably coupled to the screen drum while the outer drum is spaced apart from the screen of the screen drum.

According to the present invention, firstly, the concentrated sludge is solubilized in the rapid circulation / solubilization apparatus and then introduced into the digester, so that the digestion efficiency is excellent. Secondly, the sludge cake discharged from the first dehydrator is dehydrated secondarily from the horizontally transported electroosmotic dehydrator , And the water content of the finally discharged sludge cake can be lowered to about 65%.

According to the present invention, since the beads moving fast and irregularly in the inner space of the inner drum of the rapid circulation solubilizer apply a strong physical impact to the concentrated sludge, the solubilization efficiency is excellent.

Further, according to the present invention, since the elastic pad is provided on the inner surface of the inner drum, not only the inner drum can be protected from the physical impact but also the lowering of the repulsive force of the beads is prevented.

In addition, according to the present invention, foreign substances in the sludge are prevented from entangling with pegs rotating in the inner space of the inner drum.

In addition, according to the present invention, a foreign matter caught on the screen of the screen drum can be removed by a scraper, and the scraper is coupled to the rotating shaft, so that no separate driving force for operating the scraper is required.

Further, according to the present invention, the coupling and separation between the scraper and the rotating shaft can be easily accomplished through the coupling and separation of a pair of half-hubs.

1 is a block diagram illustrating an organic waste treatment system according to the present invention.
FIG. 2 is a perspective view showing a rapid circulation and solubilization apparatus of the organic waste treatment system shown in FIG. 1. FIG.
FIG. 3 is a perspective view showing an inner drum and a screen drum of the rapid circulation and solubilization apparatus shown in FIG. 2. FIG.
FIG. 4 is a perspective view showing the inside of the inner drum and the screen drum shown in FIG. 3; FIG.
5 is a plan view showing the peg shown in Fig.
6 is a side view of the half-side hub shown in Fig.
FIG. 7 is a perspective view showing a modification of the rapid circulation and solubilization apparatus shown in FIG. 2. FIG.

Hereinafter, preferred embodiments of the organic waste treatment system 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 a limiting sense and that the inventor may 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.

Generally, as shown in FIG. 1, the sewage drained from a home or a factory is sequentially discharged through a gypsum, a primary settling tank, a bioreactor, and a secondary settling tank of a sewage treatment plant, and finally discharged through a disinfection / filtration process. In this sewage treatment process, the raw sludge which is the organic waste settled in the primary settling tank and the excess sludge which is the organic waste settled in the secondary settling tank are generated.

As shown in FIG. 1, the organic waste treatment system according to the present invention is for treating the excess sludge. The system includes a concentrator 10, a rapid circulation and solubilization apparatus 100, a digester 20, (30), and a horizontal transfer type electroosmotic dehydrator (200).

The concentrator 10 is a device for mechanically concentrating excess sludge. The excess sludge is separated into concentrated sludge (water content of 94 to 98%) and filtrate through the concentrator 10. The rapid circulation and solubilization apparatus 100 solubilizes the concentrated sludge by applying a physical impact to the concentrated sludge discharged from the concentrator 10. When the concentrated sludge is passed through the rapid circulation and solubilization apparatus 100, the cell membrane of the organic substance contained in the concentrated sludge is destroyed and the digestion efficiency is improved.

The digester 20 is a device for stabilizing the solubilized sludge by a method such as anaerobic digestion or aerobic digestion. Organic matter of the solubilized sludge is decomposed while staying in the digestion tank 20. The primary dehydrator 30 is a device for primarily dehydrating digested sludge discharged from the digester 20. The primary dehydrator 30 may be a mechanical dehydrator such as a belt press, a filter press, a centrifugal dehydrator, or the like. The sludge cake discharged from the primary dehydrator 30 has a water content of about 80%.

The horizontal transport type electroosmotic dehydrator 200 is a device for dehydrating the sludge cake discharged from the first dehydrator 30 again. The sludge cake discharged from the horizontal transfer type electroosmotic dehydrator 200 has a water content of about 65%. The horizontal transfer type electroosmotic dehydrator 200 may be an electroosmotic dehydrator as described in Japanese Patent Application No. 10-0894266, Japanese Patent Application No. 10-0926261, Japanese Patent Application No. 10-0926262, Japanese Patent Application No. 10-0946261, Japanese Patent Application No. 10-0956613 , Registration No. 10-0956329, Registration No. 10-0981640 and the like, and a description thereof will be omitted here.

The sludge cake discharged from the horizontally transporting electroosmotic dehydrator 200 is temporarily stored in the cake delivery device 40 and is finally treated by a method such as landfill or incineration.

2 to 6, the rapid circulation and solubilization apparatus 100 includes an inner drum 110, a screen drum 120, a rotary shaft 130, a plurality of pegs 140, And an outer drum 150. As shown in FIG.

The inner drum 110 has a cylindrical shape. The lower surface and the side surface of the inner drum 110 are closed, and the upper surface is completely opened. In addition, a sludge supply pipe 112 for pressurizing and conveying the concentrated sludge to be solubilized is coupled to the lower side of the side surface of the inner drum 110. Therefore, the concentrated sludge pumped from the sludge supply pipe 112 flows into the interior of the inner drum 110, moves upward along the inner space of the inner drum 110, and is discharged to the outside of the inner drum 110 through the open top surface do.

A plurality of beads (not shown) are accommodated in the inner drum 110. The beads are small-sized metal beads that are rapidly and irregularly moved in the inner drum 110 when the rotation shaft 130 rotates. The moving beads collide with the inner surface of the inner drum 110 or collide with each other to physically impact the sludge in the inner drum 110. Then the cell membrane of the organic material contained in the sludge is broken and the sludge is solubilized . For reference, the beads are initially filled in the inner space of the inner drum 110 by an amount corresponding to about two-thirds of the height of the inner drum 110.

The beads moving in the inner drum 110 also collide with the inner surface of the inner drum 110 as described above. When the above phenomenon is repeated, the inner drum 110 may be damaged by the beads, and the elastic pad 114 is provided on the entire inner surface of the inner drum 110. The elastic pad 114 functions not only to protect the inner drum 110 but also to strongly bounce the bead. As the material of the elastic pad 114, rubber may be used.

The screen drum 120 is coupled to the upper end of the inner drum 110 by a means such as a bolt. The lower surface of the screen drum 120 is completely opened so that the solubilization sludge discharged to the open upper surface of the inner drum 110 and a part of the beads received in the inner drum 110 are separated from the inner space of the screen drum 120 Respectively. The side surface of the screen drum 120 is constituted by a screen 122 through which the sludge passes but does not pass the bead. Therefore, the solubilized sludge introduced into the inner space of the screen drum 120 is discharged to the outside of the screen drum 120 through the screen 122, and the beads remain in the inner space of the screen drum 120. The shape of the screen 122 is not particularly limited as long as it has the above functions. For reference, a wedge bar screen is used as the screen 122 in this embodiment.

The rotating shaft 130 extends vertically through the screen drum 120 and the inner drum 110. The lower end of the rotary shaft 130 is rotatably engaged with the lower center of the inner drum 110. The upper portion of the rotating shaft 130 is rotatably coupled with the upper center of the screen drum 120. The upper end of the rotating shaft 130 is positioned at an upper portion of the screen drum 120 and is connected to the motor 130. Accordingly, when the motor 130 is operated, the rotation shaft 130 rotates. For reference, the rotating shaft 130 rapidly rotates at a speed of about 1200 rpm.

A plurality of peg hubs 142 are fixed to the inner shaft of the rotary shaft 130 at a position in the inner space of the inner drum 110 so as to be aligned along the vertical direction. A plurality of pegs 140 are fixed to each of the peg hubs 142. The pegs 140 extend outward from the peg hub 142 and are arranged at regular intervals along the rotation direction of the rotary shaft 130.

These pegs 140 rapidly swirl with the rotating shaft 130 during operation of the motor 132 to stir the sludge in the inner drum 110. The beads received in the inner drum 110 then rapidly and irregularly move, colliding with each other, colliding with the inner drum 110, or colliding with the pegs 140. At the point where the collision occurs, the cell membrane of the organic matter contained in the sludge is destroyed and the solubilization of the sludge occurs.

On the other hand, the sludge generally includes a foreign substance such as hair. When the foreign substance is entangled with the peg 140, the rotation of the peg 140 is interrupted. Therefore, it is necessary to prevent the foreign matter of the sludge from entangling with the peg 140. In the present invention, the peg 140 is fixed to the peg hub 142 in an inclined posture in a direction opposite to the rotation direction of the rotary shaft 130, as shown in FIG. In this case, even if the foreign substance of the sludge is caught by the peg 140, the foreign matter slips along the peg 140 and slips out of the peg 140, thereby preventing the foreign matter from being entangled with the peg 140.

The solubilized sludge in the inner space of the inner drum 110 is discharged to the outside through the screen 122 of the screen drum 120 as described above. In this process, the screen 122 is separated from the sludge It can be blocked. Accordingly, the sludge rapid circulation and solubilization apparatus 100 according to the present invention includes a scraper 160.

The scraper 160 is installed on the rotary shaft 130 so as to be positioned in the inner space of the screen drum 120 as shown in FIG. 4 and is provided so as to be able to scratch the inner peripheral surface of the screen 122. Accordingly, the scraper 160 scrapes the inner circumferential surface of the screen 122 while rotating together with the rotating shaft 130, thereby removing the foreign matter caught on the screen 122.

The scraper 160 includes a brush plate 162, a slope rod 164, and connecting rods 166. The brush plate 162 has a brush on its outer side in contact with the inner surface of the screen 122. As shown in FIGS. 4 and 6, the slanting rod 164 is sloped downward to face the direction opposite to the rotating direction of the rotating shaft 130, and is fixed to the inner side of the brush plate 162. The connecting rods 166 are arranged along the vertical direction and connect the slant rods 164 to the half-side hub 170. The slope rod 164 may extend vertically in parallel with the rotation axis 130, unlike the above.

The half-side hubs 170 are provided in a pair and are detachably coupled to each other. The pair of half-side hubs 170 have an inner surface facing each other when they are coupled to each other, the inner surface of which has an insertion groove and two planes. The rotation shaft 130 is inserted into the insertion groove. And the two planes are located on both sides of the insertion groove. Bolt holes 174 are formed in one of the two planes so as to be arranged in the vertical direction and bolt fastening grooves 172 are formed in a vertical direction. The bolts 176 passing through one of the bolt holes 174 of the pair of half halves 170 are fastened to the bolt fastening grooves 172 of the other half half hub 170, And the half-hub 170 of the rotary shaft 130 presses the rotary shaft 130 to be engaged with each other.

The outer drum 150 receives the two drums 110 and 120 while being separated from the inner drum 110 and the screen drum 120. Therefore, the sludge that has passed through the screen 122 of the screen drum 120 falls down from the inside of the outer drum 150. Also, the outer drum 150 has a sludge discharge pipe 152 at the lower end thereof. Therefore, the sludge dropped from the inside of the outer drum 150 is discharged to the outside through the sludge discharge pipe 152.

3, the outer drum 150 is provided with a support base 154 to which the inner drum 110 is fixedly supported. In addition, two fixing pieces (not shown) are provided on opposite sides of the outer drum 150. The fixing pieces are fixed to the outer surface of the inner drum 110 through a connecting bar (not shown) And is connected to the provided fixing pieces 116.

The outer drum 150 may be provided so as to surround only the screen 122 in a state of being separated from the screen 122 of the screen drum 120 as shown in FIG. In this case, the advantages of simplifying the construction of the sludge rapid circulation and solubilization apparatus 100 and reducing the material are more significant than in the case where the outer drum 150 accommodating both the inner drum 110 and the screen drum 120 is provided.

7, the upper surfaces of the outer drums 250a and 250b are coupled to the upper surface of the screen drum 120 by means of a bolt or the like, and the lower surfaces of the outer drums 250a and 250b And is coupled to the lower end of the screen drum 120 by means of a bolt or the like. Further, the inner drum 110 is directly installed on the floor of the workplace while being exposed to the outside.

The outer drums 250a and 250b may be formed of two parts detachably coupled to each other as shown in FIG. 7. The outer drums 250a and 250b can be easily installed and separated, Maintenance / repair becomes easy. Of course, the two parts of the outer drum 250a and 250b may be formed as a single body.

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.

10: concentrator 20: digester
30: primary dehydrator 40: cake delivery device
100: Rapid circulation and solubilization apparatus 11O: Inner drum
112: sludge supply pipe 114: elastic pad
120: Screen drum 122: Screen
130: rotation shaft 132: motor
140: peg 142: hub for peg
150, 250a, 250b: outer drum 152: sludge discharge pipe
160: scraper 162: brush plate
164: inclined rods 166: connecting rods
170: half-side hub 172: bolt fastening groove
174: Bolt hole 176: Bolt
200: Horizontal transfer type electroosmosis dehydrator

Claims

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A concentrator for concentrating excess sludge which is an organic waste discharged from a secondary settler in the sewage treatment process;
A rapid circulation / solubilization device for solubilizing the concentrated sludge discharged from the concentrator;
A digester for extinguishing the sludge discharged from the rapid circulation and solubilization apparatus;
A primary dehydrator for dehydrating the extinguished sludge discharged from the digester; And
And a horizontal transfer type electroosmotic dehydrator for dewatering the sludge cake discharged from the primary dehydrator,
The rapid circulation /
An inner drum which receives the concentrated sludge from a lower end thereof and discharges the concentrated sludge through an open upper surface thereof and accommodates a plurality of beads in an inner space for applying a physical impact to the concentrated sludge;
A screen drum having an open bottom and coupled to an upper end of the inner drum, the screen drum having a sidewall through which the sludge in the inner drum passes but does not pass the bead;
A rotating shaft installed to penetrate the screen drum and the inner drum and rotated by a motor;
A plurality of pegs provided on the rotary shaft so as to be positioned in an inner space of the inner drum; And
And an outer drum having a sludge discharge pipe at a lower end thereof for discharging the sludge which is accommodated in the screen drum,
The outer drum is provided to receive the inner drum and the screen drum in a state away from the inner drum and the screen drum, or an outer surface of the outer surface of the screen drum, which is separated from the screen, Processing system.

3. The method of claim 2,
And an elastic pad is coupled to the inner surface of the inner drum.

3. The method of claim 2,
Wherein a plurality of hubs arranged in a vertical direction are fixed to the rotary shaft, and the pegs are fixed to the hub by arranging the pegs along the rotational direction of the rotary shaft.

5. The method of claim 4,
Wherein the peg extends outwardly from the hub and is inclined to extend in a direction opposite to the rotational direction of the rotating shaft.

3. The method of claim 2,
The rapid circulation /
And a plurality of scrapers installed on the rotating shaft so as to be positioned in an inner space of the screen drum and scraping off foreign materials stuck to the screen of the screen drum.

The method according to claim 6,
Wherein the plurality of scrapers are respectively fixed to a pair of half-side hubs which pressably press the rotary shaft and are detachably coupled to each other.

8. The method of claim 7,
Wherein the half-hub has an insertion groove for insertion of the rotary shaft and two planes positioned on both sides of the insertion groove, wherein one of the two planes has a bolt hole and the other has a bolt fastening groove.

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