KR100312612B1 - High pressure dehydrating system of sludge with vacuum roller and compression belt - Google Patents

Abstract

PURPOSE: A high pressure dehydrating system is provided to get low water content sludge by vacuum suction and compression belt. CONSTITUTION: The high pressure dehydrating system comprises a primary press roller which dehydrates sludge supplied through chute, a vacuum roller(31) of which inside is connected to a vacuum pump(81) through a vacuum line(26), a sealing belt(13) which gives vacuum suction power to the vacuum roller, several guide rollers(24,25) which guide the sealing belt to the outside of the vacuum roller(31) for proper degree, a primary vacuum dehydrating device(4) which sucks water from the sludge through several holes of the vacuum roller(31) which is connected to the vacuum pump(81), a secondary press roller(17) which reverses the direction of the belt, a secondary vacuum/water dehydrating device(5) which dehydrates more intensely than primary vacuum dehydrating device(4), and an air spring which helps the sludge cake to be removed form roller.

Description

High Pressure Dewatering System of Sludge Using Vacuum Roller and Water Adsorption Belt

The present invention relates to a high pressure dewatering system of sludge using a vacuum roller and a water adsorption belt, and in particular, a combination of a vacuum suction device and a high pressure belt press of two stages simultaneously presses and adsorbs water on the sludge to make a cake. The present invention relates to a high pressure dewatering system of sludge that can significantly reduce the water content of and reduce the operating cost of the system.

In general, the purification treatment of municipal sewage activated sludge, manure active surplus sludge, various industrial wastewater surplus sludge, and chemical precipitation sludge in a water purification plant is mixed with a polymer flocculant in a sludge agitator tank to achieve a good dehydration floc (FLOC). After the formation of the feed to the dehydrator to remove the moisture of the cake-shaped debris by the process of removing the transfer to an incinerator or landfill, and the desorption filtrate is returned to the aeration tank and the like to purify.

The double belt press type dehydrator is mainly used for the dewatering of the conventional sludge. The dehydrator first feeds various sludges to be treated as a pretreatment to the quantitative supply tank, drains the filtrate, and supplies the precipitated sludge together with the polymer flocculant to the sludge agitating tank to homogenize with a stirrer and react to form a floc suitable for dehydration.

Then, evenly supplied to the lower belt for sludge transfer through the chute chute of the dehydrator, through the gravity dewatering and wedge dehydration, for example, in the multi-stage compression roller having a concave-convex structure on the front or a plurality of water discharge holes For example, as the upper and lower belts made of polyester filter cloth are compressed, water flows down and is collected by the drainage device, and the residue is discharged to the outside in the form of a cake.

As mentioned above, most cakes obtained after dewatering sludge in various wastewater treatment plants are treated by landfilling, ocean dumping, drying, incineration, etc. Cannot be imported.

In addition, even when the cake is dried or incinerated, a cake containing a lot of water is desperately required to develop a dehydration machine capable of producing a cake of low moisture content due to the generation of secondary pollutants due to high fuel cost and insufficient combustion.

In this case, it is necessary to develop a new dehydration system that can be installed in addition to the existing dehydration system as well as a new installation to maximize the moisture content, reducing the maintenance cost of the treatment plant according to the reduction of the cake and improving the environment. It is becoming.

However, as described above, the high-pressure dehydration apparatus of the conventional belt press type dehydrator generally uses oil / pneumatic pressure to dehydrate by various kinds of high pressure belts or linear pressure, or pressurizes without sufficient initial dewatering, so that the sludge There is a problem that clogging of the filter cloth is caused by the pressurization in a state that is not pushed or solidified to the left and right sides of the belt.

Moreover, the conventional dehydration apparatus has a problem that the apparatus is complicated by using a plurality of compression rollers to increase the dehydration rate, uses a long filter cloth, and increases the size of the entire apparatus.

Therefore, the present invention has been made in view of the problems of the prior art, the purpose of which is to combine the two-stage vacuum suction device and the high-pressure belt press to simultaneously compress and moisturize the sludge to significantly lower the moisture content of the cake It is to provide a high pressure dewatering system of sludge which can reduce the operating cost of the system.

Another object of the present invention is to provide a high pressure dewatering system that can achieve a powerful dewatering by combining two-stage vacuum adsorption and high pressure belt press to simply configure the system as a small number of rollers to realize a small size of the whole system have.

1 is a front view showing the entire high pressure dewatering system of the sludge using a vacuum roller and a moisture adsorption belt according to an embodiment of the present invention,

Figure 2 is an enlarged view showing the first vacuum suction device of Figure 1,

3 is an explanatory diagram showing a vacuum suction angle of FIG.

4 is a cross-sectional view showing a vacuum roller according to the present invention,

Figure 5 is a partially cutaway perspective view showing the vacuum suction line arrangement of the vacuum roller,

Enlarged view of shaft support,

6 is an enlarged view of the axial support of the vacuum roller,

7 is a plan view of the sealing pad,

8 is a plan view of the cap in surface contact with the sealing pad of FIG.

9 is an enlarged view illustrating a second vacuum suction device of FIG. 1;

10 is an explanatory diagram showing a vacuum suction angle of FIG. 9;

11 is a cross-sectional view showing the moisture adsorption belt and the vacuum roller of the second vacuum suction device.

* Explanation of Signs of Major Parts of Drawings *

One ; Belt press type dehydrator 2; Mixing tank

3; Chute 4; Primary vacuum dewatering device

5; Secondary vacuum / moisture adsorption high pressure dehydrator 6; Driving roller

7; Sump 8; Vacuum

9; support frame 11; Phase filter cloth

12; Lower filter cloth 13; Sealing belt

14; Vacuum and moisture adsorption belt 15; Guide roller

17; Secondary press roller 21; pipe

23; Air bellows 24,25; Final guide roller

26; Vacuum line 31; Vacuum roller

50; Sludge 51; cake

81; Vacuum pump

In order to achieve the above object, the present invention is a double belt press type dewatering system, the first press roller for receiving the sludge supplied to the chute between the upper and lower filter cloth belt and the initial dewatering, and the initial dewatered sludge vacuum The first vacuum dewatering device for forcibly adsorbing water contained in the sludge through a plurality of through-holes of the vacuum roller connected to the pump, the second press roller for reversing the traveling direction of the belt, and the vacuum and water adsorption belt And a second vacuum / water adsorption high pressure dewatering device which simultaneously performs powerful dehydration inside / outside the upper / lower filter cloth belt by more powerful vacuum suction and moisture adsorption than the first vacuum dehydration device, A cake-shaped slab disposed and discharged from the second vacuum / moisture adsorption high-pressure dehydrator to facilitate peeling of the cake at the rear end. Whether the system provides a high pressure dewatering of sludge, characterized in that consisting of the air spring for applying a line pressure.

As described above, in the present invention, the first vacuum dewatered sludge is subjected to vacuum dewatering in a second manner, and by adopting a high pressure belt tension device by hydraulic force and arm, the surface pressure is applied to the sludge to obtain a superior low water content cake. have.

The high pressure belt used in the high pressure belt tensioning device uses a specially designed moisture absorption belt to absorb moisture separated from the sludge by the high pressure of the high pressure belt tensioning device at the same time as the vacuum suction, and the filtrate re-infiltrates into the sludge. It is possible to produce a cake containing about 5 to 7% lower moisture than the conventional belt press type dehydrator by preventing even the fine water flowing through the filter cloth.

In addition, by installing an additional air pressure device using an air spring on the driving roller, the cake solidified while passing through the high pressure device using the primary, secondary vacuum, and water adsorption belts in the filter cloth is secured without deflection of the filter cloth. Pressurized dehydration can be carried out by linear pressure.

(Example)

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a front view showing the entire high pressure dewatering system of the sludge using the vacuum roller and the water adsorption belt according to a preferred embodiment of the present invention, and is designed to have a two-stage vacuum dewatering process.

Referring to FIG. 1, first, the sludge and the coagulant transferred from the sludge pump and the polymer coagulant tank are agglomerated and stirred for a predetermined time in the mixing tank 2, and then the inlet of the belt press type dehydrator 1 through the pipe 21. It is supplied to the chute (3) installed in the.

Subsequently, after the initial dehydration while slowly passing through the gravity dehydration unit and the wedge dehydration unit 22 by the rotational force of the driving roller 6, it is introduced into the pressure dewatering unit. At this time, since the sludge 50 trapped between the upper and lower filter cloths 11 and 12 contains a lot of water and a left and right push occurs even with a small external pressure, initial dewatering is performed through the primary press roller 16.

Thereafter, the initially dewatered sludge 50 passes through the primary vacuum dewatering device 4, and a vacuum suction action proceeds into the vacuum roller 31 by the vacuum pump 81, so that the sludge 50 is left and right of the belt. Forced dehydration occurs without jungle.

After the reverse direction of the belt through the secondary press roller 17, the primary vacuum dewatering while passing through the secondary vacuum / moisture adsorption high-pressure dehydration device (5) using the secondary vacuum and moisture adsorption belt (14) Strong dehydration proceeds simultaneously inside and outside of the upper and lower filter cloths 11 and 12 by more powerful vacuum suction and water adsorption, and the secondary vacuum / water adsorption high pressure dehydration device 5 Surface pressure is applied to the sludge 50 to increase the dehydration effect.

Through the above process, the sludge 50 is sufficiently dehydrated to change into a cake 51 in a solid state in which no rolling occurs under any external force.

Subsequently, the texture density of the cake is increased by applying the linear pressure by the air bellows 23 disposed below the drive roller 6 to the filter cloths 11 and 12 containing the cake sludge. As a result, the cake 51 can be easily peeled from the filter cloth 11, 12 when the filter cloth 11, 12 is separated by the final guide rollers 24, 25, and is 5% or more compared to a general belt press type dehydrator. A low moisture content cake can be obtained.

Moisture collected through the vacuum roller 31 and the vacuum line 26 by the vacuum pump 81 is drained through the collecting tank 82 of the vacuum apparatus 8, and also desorption separated through the dehydration process The filtrate is collected in a sump 7 and transported for purification.

Hereinafter, the primary vacuum dehydrator 4 and the secondary vacuum / moisture adsorption high pressure dehydrator 5, which are the core devices of the present invention, will be described in more detail.

The primary vacuum dewatering device 4 is a device for forcibly dehydrating by vacuum suction of moisture contained in the sludge 50 from the inside of the vacuum roller 31 without the left / right push of the sludge using the vacuum pump 81. 2 to 8, the upper and lower filter cloths 11 and 12 having the sludge 50 interposed therebetween are connected to the vacuum pump 81 through the vacuum line 26. Sealing belt 13 which seals a certain circular arc portion of the returning vacuum roller 31 and the upper and lower filter cloths 11 and 12 returning to the outer circumference of the vacuum roller 31 to impart a vacuum suction force to the vacuum roller 31. And first to fourth guide rollers (1) to one end of which are mounted to the support frame (9) to guide the sealing belt (13) made of rubber material to be in close contact with the outer circumference of the vacuum roller (31) by a predetermined angle. 32-35).

In particular, the vacuum roller 31 has a cylindrical drum 41 having a plurality of water suction through-holes 42, as shown in FIGS. 4 and 5, and is fixed to both sides of the cylindrical drum 41, and the drum Rotating shafts 43 whose both ends penetrate the center of the rotating shaft 43 are rotatably supported by the support frame 9 through bearings 57, and eight vacuum passages each formed extending from both ends of the rotating shaft into the drum 41; 44, 45 and the vacuum suction line 46, 47 connected to the through hole 42 formed at the outer circumference of the drum 41 at a plurality of points, one end of which is connected to the inside of the drum and is bent at right angles. It is included.

In this case, the eight vacuum passages 44 and 45 on both sides are formed to be offset from each other by a predetermined angle, so that the eight pairs of vacuum suction lines 46 and 47 connected to the vacuum passages 44 and 45 also alternately form the inner peripheral part of the drum. Are arranged accordingly.

In addition, caps 52 having eight through-holes 53 formed at positions corresponding to the eight vacuum passages 44 and 45, respectively, are fixed to both end surfaces of the rotation shaft 43. And a sealing pad 48 having an arc-shaped through hole 49 cut in a predetermined angle on the same circumference as the vacuum passages 44 and 45 so as to be in surface contact with the cap. In addition, the outer surface of the sealing pad 48 is supported on one side of the sealing pad housing 59 in which a hollow passage 54 is formed in the center, and the other end of the housing 59 is connected to the vacuum line 26.

The bearing 57 supporting the rotating shaft 43 is embedded in the bearing housing 55, and the outer case 58 is fixed to the outside of the sealing pad 48 to cover them while compressing the elastic spring 56.

In the primary vacuum dehydration apparatus 4 of the present invention configured as described above, as shown in FIG. 3, the sealing belt 13 contacting the upper and lower filter cloths 11 and 12 continuously maintains a contact angle of about 195 °. Rotate Therefore, the circumferential angle of the vacuum roller 31, which can be vacuumed by blocking the atmospheric pressure by the sealing belt 13, is limited to the range of 195 °. Moreover, the sealing pad 48 is crimped | bonded with the rotating shaft 43 of the vacuum roller 31 by the elastic spring 56, and is in the state which kept airtight.

In this case, when the through hole 49 of the sealing pad 48 is set to 187.5 ° as shown in FIG. 7, the hollow passage 54 of the vacuum line 26 and the sealing pad housing 59 when the vacuum pump 81 operates. ), Through holes 49 of the sealing pads 48, vacuum passages 44 and 45 of the rotary shaft 43 communicating with the through holes 49 of 187.5 degrees, vacuum suction lines 46 and 47, and a plurality of through holes. The vacuum suction force acts on the sludge 50 inserted into the filter cloths 11 and 12 through the hole 42. At this time, since the inflow of atmospheric pressure is blocked by the sealing belt 13, the moisture of the sludge 50 trapped between the filter cloths in close contact with the outer circumferential surface of the vacuum drum 41 continuously passes through the vacuum suction line 46 through the through-hole 42. 47) is forced into the vacuum and collected in the vacuum line 26 in the reverse order to be sucked into the vacuum pump (81).

On the other hand, the secondary vacuum / moisture adsorption high pressure dehydration device (5) disposed at the rear end of the primary vacuum dewatering device (4) is a vacuum suction dewatering and water adsorption dewatering by using a more powerful vacuum suction and moisture adsorption belt As a dehydrator for performing surface pressure dewatering, upper and lower filter cloths having internally connected to the vacuum pump 81 through vacuum lines 26 and having sludge 50 embedded therein as shown in FIGS. 9 to 11 ( 11, 12 seals a certain circular arc portion of the vacuum roller 31, which passes through the outer periphery and the upper and lower filter cloths 11, 12, which exits the outer periphery of the vacuum roller 31, and at the same time separates water by compression. Water adsorption belt 14 which adsorbs moisture and gives vacuum suction force to the vacuum roller 31, one end is installed on the support frame 9, and the moisture adsorption belt 14 is attached to the outer circumference of the vacuum roller 31. First to third guide rollers 61-63 for guiding to be in close contact with the 180 degree range. And a hydraulic cylinder 64 for varying the position of the third guide roller 63 up and down to vary the surface pressure with respect to the moisture adsorption belt 14.

The vacuum roller 31 has the same structure as that used in the primary vacuum dewatering device 4, and the third guide roller 63 has one end hinged to the support frame 9 and the other end of the hydraulic cylinder 64. Is installed on the tension adjusting piece 66 connected to one end. Accordingly, as the rod of the hydraulic cylinder 64 is extended, the third roller 63 of the tension adjusting piece 66 descends to tension the moisture adsorption belt 14, and as a result, the sludge 50 is embedded therein. The pressing force on the upper and lower filter cloths is increased.

Therefore, the difference between the secondary vacuum / moisture adsorption high pressure dehydrator 5 and the primary vacuum dehydrator 4 uses a more powerful vacuum suction and moisture adsorption belt 14 instead of the sealing belt 13. The surface pressure dehydration is performed by vacuum suction dehydration and water adsorption dehydration.

The present invention system is designed to be applied to a belt press or a new belt press that is being operated as a device that can lower the moisture content of the belt press type dehydrator operated in each wastewater treatment plant.

In the above embodiment, eight vacuum suction lines are arranged on both sides, but not limited thereto, and the number of vacuum suction lines can be increased or decreased depending on the processing capacity, and the vacuum dehydration device is configured in two stages. It is also possible to increase or use it in combination with other dehydrators.

As described above, in the present invention, the first vacuum dewatered sludge is subjected to vacuum dewatering in a second manner, and by adopting a high pressure belt tension device by hydraulic force and arm, the surface pressure is applied to the sludge to obtain a superior low water content cake. have.

The high pressure belt used in the high pressure belt tension device uses a specially designed moisture absorption belt to absorb moisture separated from the sludge by the high pressure of the high pressure belt tension device at the same time as the vacuum suction, and the filtrate re-infiltrates into the sludge. It is possible to produce a cake containing about 5 to 7% lower moisture than the conventional belt press type dehydrator by preventing even the fine water flowing through the filter cloth.

In addition, a linear pressure device using an air spring made of air bellows is additionally attached to the driving roller, so that the solidified cake passes through the high pressure device using the primary, secondary vacuum, and moisture adsorption belts in the filter cloth without sagging of the filter cloth. Can be dewatered by linear pressure.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (4)

A first press roller for receiving the sludge supplied into the chute between the upper and lower filter cloth belts and initial dewatering; A vacuum roller in which the inside is connected to the vacuum pump via a vacuum line, and the upper and lower filter cloth belts with sludge built in the middle run around the outer circumference; A sealing belt which seals a predetermined circular arc portion of the upper / lower filter cloth belt running out of the outer circumference of the vacuum roller to impart a vacuum suction force to the vacuum roller; It is composed of a plurality of guide rollers, one end of which is installed on the supporting frame to guide the sealing belt to the outer circumference of the vacuum roller by a certain angle. A first vacuum dewatering device for forcibly adsorbing moisture contained in the sludge through a plurality of through holes of the vacuum roller connected to the vacuum pump; A second press roller for reversing the advancing direction of the belt; A second vacuum / moisture adsorption high-pressure dehydration device that uses a vacuum and moisture adsorption belt to simultaneously perform powerful dehydration inside and outside the upper and lower filter cloth belts by more powerful vacuum suction and moisture adsorption than the first vacuum dehydration device. ; Sludge, characterized in that the air spring for applying the linear pressure to the cake sludge discharged from the second vacuum / moisture adsorption high pressure dewatering device disposed in the lower portion of the drive roller to facilitate the separation of the cake at the final stage High pressure dewatering system. According to claim 1, wherein the second vacuum / moisture adsorption high pressure dehydration device A vacuum roller in which the inside is connected to the vacuum pump via a vacuum line, and the upper and lower filter cloth belts with sludge built in the middle run around the outer circumference; A vacuum / moisture adsorption belt for enclosing a predetermined circular arc portion of the upper / lower filter cloth belt running out of the outer circumference of the vacuum roller to impart vacuum suction force to the vacuum roller and adsorb moisture separated by compression; A sludge high pressure dewatering system, comprising: a plurality of guide rollers having one end mounted on a support frame to guide the vacuum / moisture absorption belt to the outer peripheral portion of the vacuum roller by a predetermined angle. The method of claim 1, wherein the vacuum roller A cylindrical drum having a plurality of water suction through-holes, A rotating shaft fixed to both sides of the cylindrical drum and rotatably supported at both ends of the cylindrical drum through a bearing to the support frame; A plurality of vacuum passages extending from both ends of the rotating shaft into the drum; A plurality of vacuum suction lines, one end of which is connected to the vacuum passage in the drum and the other end extending therefrom is connected to a through hole formed in the outer circumference of the drum at a plurality of points; It is characterized in that it comprises a coupling means for connecting the vacuum suction line and the vacuum line in communication with the vacuum pump by alternately contacting both ends of the rotating shaft through only the vacuum suction line of a certain angle of the plurality of vacuum suction lines Sludge high pressure dewatering system. The sludge high pressure dewatering system according to claim 2, wherein at least one of the plurality of guide rollers further includes surface pressure adjusting means for adjusting the surface pressure of the upper and lower filter cloth belts.