WO2016032017A1

WO2016032017A1 - Vertical-type screw dewatering device and sludge processing system

Info

Publication number: WO2016032017A1
Application number: PCT/KR2014/007956
Authority: WO
Inventors: 김혜안
Original assignee: 김군수
Priority date: 2014-08-27
Filing date: 2014-08-27
Publication date: 2016-03-03

Abstract

The present invention relates to a vertical-type screw dewatering device wherein the screw dewatering device is designed in a vertical type, and transfers sludge to be processed an upper portion while compressing the same using a pressurization screw plate such that, using the difference in specific gravity between water and coagulated sludge, water is discharged through dewatering holes of a dewatering screw plate, which is formed on the sludge, thereby preventing the dewatering holes from being clogged and guaranteeing efficient concentration or dewatering of the sludge to be processed within a short period of time.

Description

Vertical Screw Dehydrator and Sludge Treatment System

The present invention relates to a vertical screw dehydrator for dewatering or condensing sludge to be treated consisting of water and flocculant sludge, and more specifically, the difference between specific gravity of water and flocculated sludge as the sludge to be treated is conveyed while being compressed. The present invention relates to a vertical screw dehydrator and a sludge treatment system using the same, by which water is discharged to a dehydration hole of a dewatering screw plate formed at an upper portion thereof so that sludge to be treated can be smoothly concentrated or dehydrated quickly.

Sludge containing water from industrial wastewater treatment facilities, wastewater treatment facilities and environmental wastewater treatment facilities such as agricultural and livestock should be treated, which is contained in the sludge by the dehydration rate of the sludge, that is, solid-liquid separation and dewatering device. Sludge dehydration rate is very important for how much water has been removed, which means that there is a big difference in the cost and recycling range of sludge depending on the amount of water contained in the sludge. If it can be removed, the cost of disposal and disposal of the sludge is reduced, as well as very economical added value, such that the solid components of the sludge can be recycled as fuel.

In general, in order to process the sludge, the polymer coagulant is added to the reaction tank containing the water-containing sludge to remove the water by solid-liquid separation of the sludge as the sludge reacts with the introduced polymer coagulant. The use of a flocculant alone does not sufficiently remove the water from the sludge, which lowers the dewatering efficiency of the sludge.

Thus, a device for increasing the dewatering efficiency of the sludge, that is, a dehydration device such as a centrifugal dehydrator, a belt press, a screw dehydrator, etc. is used to remove water contained in the sludge, that is, the sludge agglomerated by the flocculant is dewatered. The injected sludge is compressed by centrifugal force or a roller in the dehydration apparatus, or moisture is removed by a compression movement of a screw.

The centrifugal dehydrator supplies sludge (agglomerated solidified sludge) inside a bowl rotating at 2000 to 3000 rpm, and separates and dehydrates water and solids having different specific gravity by using the centrifugal force of the rotating bowl. The dehydrator has high power consumption for rotating the bowl at high speed, severe vibration and noise caused by the rotating bowl as well as failure and malfunction of the centrifugal dehydrator, resulting in maintenance and management of the centrifugal dehydrator. This is difficult, the cost, time, and manpower loss according to this, in addition, if the difference in specific gravity is not very high or the viscosity is high sludge fine particles, there was a problem that the dewatering efficiency of dewatering the sludge is deteriorated.

The belt press supplies sludge between two filter cloths (or high-pressure belts, etc.) and presses the pressure (or air pressure) of each roller while passing through a plurality of rollers while the sludge is wrapped by the two filter cloths. Dehydration of water contained in the sludge by the belt press, the belt press is difficult to adjust the automatic operation in accordance with the change in the supply amount of the sludge, or the concentration of the sludge, when the excessive amount of flocculant for flocculating the sludge, the eye of the filter cloth As the clogging occurs, the dewatered water from the sludge does not pass through the filter cloth, and the dewatering efficiency is not only lowered. When the clogging phenomenon occurs, the filter cloth is not easily washed due to the high viscosity of the flocculant. Even after washing, it is hard to recover to its original state, and the sludge and washing water are Depending on can be scattered to the outside of the bit around the press severe fouling by the sludge and the wash water in which the scattering of course there is a problem in that the odor has occurred.

The screw dehydrator removes water from the sludge as well as removes water from the sludge while pressing the sludge containing water into the dehydrator and rotates the screw to the opposite side.

The dehydrator related to the present invention relates to a screw dehydrator.

As a conventional technology related to a screw dehydrator, Korean Registered Utility Model Publication No. 20-0232305 'Wound-type dewatering device using a wedge-type wire filtration cylinder', Korean Patent No. 10-1106168 'Screw dehydrator' has been known.

The screw dehydrator of the prior art is provided with a conical inner cylinder in the cylindrical outer cylinder, the pressurized screw plate is provided in the conical inner cylinder to press the sludge.

On the other hand, the sludge conveyed while being pressed by the pressure screw plate is discharged through the outer cylinder (or wedge-shaped wire), so that the outside of the outer cylinder requires a separate facility for receiving the dehydration liquid.

In other words, the screw dehydrator of the prior art requires a separate dehydration liquid collection facility that is arranged to surround the cylindrical outer cylinder to receive the dehydration liquid as well as the conical inner cylinder, the cylindrical outer cylinder, such a structure that makes the screw dehydrator huge Becomes

On the other hand, Japanese Patent Laid-Open No. 2002-1589 discloses a horizontal pressurized dehydrator having a horizontal cylinder provided horizontally, an inner cylinder installed inside the outer cylinder wound the screw blades, and a filtrate chamber formed inside the wing surface of the screw blade. .

In addition, the prior art has a structure in which both of the screw blades are formed with perforation members, and the sludge to be treated is dewatered by both of the screw blades.

Since the prior art is installed horizontally, the escape through the punching member is not only moisture but also sludge, so that the punching member is gradually clogged, and thus the equipment for periodically cleaning the punching member such as a scraper. Will be needed.

The present invention has been made to solve the problems of the prior art as described above, the sludge is dewatered through the main surface of the cylindrical outer cylinder, the sludge is dewatered through the screw member makes the overall structure simple and compact, and also screw As the dehydrator is designed vertically and the sludge to be treated is pressed with a screw plate for pressurization, the water is discharged to the dehydration hole of the dewatering screw plate formed on the upper part by using the difference in specific gravity between water and flocculated sludge. It is to provide a vertical screw dehydrator and a sludge treatment system using the same to prevent the clogging of the dehydration hole and to smoothly concentrate and dehydrate the sludge to be treated quickly.

In order to solve the above problems, the present invention, the sludge inlet through which the sludge to be treated is introduced into the lower end, the sludge outlet is formed is discharged sludge is discharged to the upper end is formed in a cylindrical outer cylinder; A conical inner cylinder which is provided rotatably inside the cylindrical outer cylinder concentrically with the axial center of the cylindrical outer cylinder, and has a diameter gradually increasing toward the upper end from the lower end of the cylindrical outer cylinder; The radially outer end maintains a diameter corresponding to the inner diameter of the cylindrical outer cylinder, and the radially inner end is fixed to the conical inner cylinder while spirally wound along the outer circumferential surface of the conical inner cylinder and is rotated together with the rotation of the conical inner cylinder. The pressing screw plate for pressing the radially outer end portion is connected to the radially outer end portion of the pressing screw plate and the radially inner end portion is spaced downwardly with respect to the pressing screw plate while the outer peripheral surface of the conical inner cylinder Screw member is fixed to the screw member comprising a screw plate for dewatering a plurality of dehydration holes are formed; A rotation drive member provided to rotate the conical inner cylinder; The sludge to be treated includes water and agglomerated sludge having a specific gravity greater than that of water. Due to the difference in specific gravity of the water and the flocculated sludge, the water suspended in the upper part of the flocculated sludge is separated from the screw plate for dehydration. A discharge port is discharged as a dehydration liquid through a dehydration hole, and a communication port is formed on a main surface of the conical inner cylinder so that dehydration liquid introduced between the pressurizing screw plate and the dewatering screw plate through the dehydration hole flows into the conical inner cylinder. The dehydrating liquid discharge path for discharging the dehydrating liquid introduced into the inside of the conical inner cylinder to the outside of the cylindrical outer cylinder along the axial direction of the cylindrical outer cylinder is formed.

In the above, it is preferable that the radially outer end portion and the radially inner end portion of the pressing screw plate are located at the same height so that the pressing screw plate has a flat cross-sectional structure.

In the above, it is preferable that the diameter of the dehydration hole is 0.01 mm to 0.2 mm.

According to another aspect of the present invention, a sludge treatment system including the vertical screw dehydrator and a dehydrator receiving and dehydrating the dewatered sludge discharged from the vertical screw dehydrator may be provided.

In another aspect of the present invention, a sludge treatment system including the vertical screw dehydrator and a filter for receiving and filtering the dehydration liquid discharged from the vertical screw dehydrator may be provided.

As described above, in the present invention, the sludge is dehydrated through the main surface of the cylindrical outer cylinder, and the overall structure is simple and compact by allowing the sludge to be dewatered through the screw member, and the screw dehydrator is vertically designed and the sludge to be treated. As it is conveyed to the upper part while being compressed by the pressure screw plate, the water is discharged to the dewatering hole of the dewatering screw plate formed on the upper part by using the difference in specific gravity between water and coagulated sludge, thereby preventing clogging of the dewatering hole. The present invention provides a vertical screw dehydrator capable of smoothly concentrating and dehydrating sludge and a sludge treatment system using the same.

1 is a conceptual cross-sectional view of a vertical screw dehydrator according to an embodiment of the present invention;

2 is a front view of the screw member and the conical inner cylinder,

3 is a bottom view of FIG. 2.

4 is a view showing a state in which the vertical screw dehydrator of the present embodiment and a conventional general dehydrator are connected and used.

5 is a view illustrating a state in which the vertical screw dehydrator of the present embodiment is connected to a conventional general filter and used.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

1 is a conceptual cross-sectional view of a vertical screw dehydrator according to an embodiment of the present invention, FIG. 2 is a front view of a screw member and a conical inner cylinder, and FIG. 3 is a bottom view of FIG.

The sludge to be treated herein refers to sludge to be dehydrated or concentrated, and the sludge to be treated is composed of water (water) and agglomerated sludge having a specific gravity greater than that of water.

Agglomerated sludge refers to the sludge agglomerated by the flocculating agent, and in general, the specific gravity of the solids of the coagulated sludge is 1.5 to 2.5, so the sludge to be treated may be classified into water suspended in the upper part and flocculated sludge in the lower part.

The vertical screw dehydrator is designed based on the fact that the sludge to be treated can be divided into water at the top and flocculation sludge at the bottom by the difference in specific gravity.

The vertical screw dehydrator 100 is composed of a cylindrical outer cylinder 110, a conical inner cylinder 120, a screw member 130, a rotation drive member 140 and the like.

Cylindrical outer cylinder 110 is formed in a cylindrical shape in the vertical direction, specifically, the structure is formed long in the axial direction.

The cylindrical outer cylinder 110 is formed with a sludge inlet 111 through which the sludge to be treated is introduced, and a sludge outlet 112 through which the dewatered sludge flows out, and is vertically disposed.

The cylindrical outer cylinder 110 has a watertight structure so that the water inside the sludge inlet 111 and the sludge outlet 112 are not all discharged to the outside.

The conical inner cylinder 120 is provided inside the cylindrical outer cylinder 110.

The conical inner cylinder 120 is disposed concentrically with the axial center of the cylindrical outer cylinder 110, that is, it is arranged to stand in the vertical direction, and is provided to be rotatable inside the cylindrical outer cylinder 110. That is, the conical inner cylinder 120 is also disposed vertically and rotatable about a vertical axis.

To this end, first and

second support shafts

121 and 122 are provided at both ends of the conical inner cylinder 120, and the first and

second support shafts

121 and 122 are cylindrical outer cylinders 110. It is supported by the bearing 123 while passing through the center of the upper cover and the lower cover.

In addition, the conical inner cylinder 120 has a hollow structure, and also has a form in which the diameter gradually increases toward the upper end from the lower end.

The rotation drive member 140 is provided outside the cylindrical outer cylinder 110 to drive the conical inner cylinder 120.

In this embodiment, the rotation drive member 140 is fixed to the motor 141, the drive gear 142 connected to the drive shaft of the motor 141, and the drive gear fixed to the first support shaft 121 of the conical inner cylinder 120. It is made of a driven gear 143 is geared with 142, but this is only one example, various modifications are possible.

The conical inner cylinder 120 is rotated in the cylindrical outer cylinder 110 by the rotation drive member 140.

Meanwhile, a screw member 130 is provided on the outer circumferential surface of the conical inner cylinder 120.

In this embodiment, the screw member 130 is wound spirally along the outer circumferential surface of the conical inner cylinder 120, and also rotates with the conical inner cylinder 120. The radially outer ends of the screw members 130 also maintain the same diameter. That is, the radially outer end of the screw member 130 has a diameter corresponding to the inner diameter of the cylindrical outer cylinder 110 (preferably closer to the inner peripheral surface of the cylindrical outer cylinder 110 is preferable.).

The shape of such a screw member 130 can be seen as the same as the conventional screw dehydrator.

However, the screw member 130 of the present embodiment has a structure in which the pressure screw plate 131 and the dewatering screw plate 132 are combined, which is not disclosed in the prior art, and also the screw member of the present embodiment. 130 is different in that it is rotated about a vertical axis.

In addition, the screw member 130 of the present embodiment has an arrangement structure in the vertical direction in which the pressure screw plate 131 is located at the top and the dewatering screw plate 132 is located at the bottom. In this arrangement structure, the pressurizing screw plate 131 is disposed under the sludge to be treated and the dewatering screw plate 132 is disposed on the sludge to be treated.

In this embodiment, the pressurizing screw plate 131 and the dewatering screw plate 132 are disposed vertically facing each other, and the pressurizing screw plate 131 faces the sludge outlet 112 (that is, upwards). Or the lower side with respect to the sludge to be treated, and the screw plate 132 for dewatering is disposed toward the sludge inlet 111 (that is, toward the lower side or above the sludge to be treated).

In addition, the screw member 130 has a structure in which both ends are blocked so that sludge does not flow into the inside. Therefore, the screw member 130 may be introduced into the dehydration liquid only through the dehydration hole 132a, which will be described later, and has a structure in which sludge or water cannot flow into other portions.

Pressing screw plate 131 is fixed to the outer peripheral surface of the conical inner cylinder 120 in the radially inner end to press the sludge to be processed thereon in accordance with the rotation of the conical inner cylinder (120).

Therefore, the pressurizing screw plate 131 should not have a space in which sludge or water can escape, such as a hole.

In addition, the pressurizing screw plate 131 is preferably positioned at the same or higher position than the radially inner end in the cross-sectional structure thereof. This is to suppress the sludge from being caught between the radially outer end of the screw plate 131 for pressurization and the inner circumferential surface of the cylindrical outer cylinder 110.

That is, when the radially outer end portion is positioned at the same height as the radially inner end portion in the cross-sectional structure of the pressing screw plate 131 as shown in FIG. 1, the cross-sectional structure of the pressing screw plate has a flat cross-sectional structure.

Meanwhile, the dehydration screw plate 132 is provided to face the pressure screw plate 131.

The radially outer end of the dewatering screw plate 132 is connected to the pressurizing screw plate 131 and the radially inner end is spaced downwardly with respect to the pressurizing screw plate 131 to the outer peripheral surface of the conical inner cylinder 120. It is fixed.

That is, the cross-sectional structure formed by the dehydrating screw plate 132, the pressurizing screw plate 131, and the conical inner cylinder 120 has a triangular shape with the outer end of the radial direction as a vertex, and the inside thereof becomes an empty structure. .

In addition, a plurality of dewatering holes 132a are formed in the dewatering screw plate 132.

The diameter of the dehydration hole 132a is 0.01 mm to 0.2 mm.

If the diameter of the dewatering hole 132a exceeds 0.2 mm, there is a risk that the amount of water to be dehydrated increases and the coagulated sludge escapes together.

If the diameter of the dewatering hole 132a is less than 0.01 mm, the amount of water dehydrated is too small due to the size so small that the dewatering efficiency is drastically reduced.

The dewatering hole 132a is formed in advance in the flat state before the dewatering screw plate 132 is helically deformed through laser processing or the like, and if the plate shape is helically deformed, the dewatering hole 132a is formed. The spiral dewatering screw plate 132 is completed.

As described above, the present embodiment can easily manufacture the dehydration screw plate 132 is formed with a dehydration hole (132a).

On the other hand, the main surface of the conical inner cylinder 120 has a plurality of communication so that the dehydration liquid introduced between the pressurizing screw plate 131 and the dewatering screw plate 132 through the dehydration hole 132a flows into the conical inner cylinder 120. Sphere 124 is formed.

Since the space of the triangular cross section formed by the dewatering screw plate 132, the pressure screw plate 131, and the conical inner cylinder 120 is spirally wound along the outer circumferential surface of the conical inner cylinder 120, theoretically, the communication hole ( Only one 124 may be formed. In this embodiment, however, a plurality of communication ports 124 are formed.

In addition, the dehydration liquid introduced into the conical inner cylinder 120 through the communication port 124 is discharged to the outside of the cylindrical outer cylinder 110 along the dehydration liquid discharge path 122.

In this embodiment, the dehydration liquid discharge passage 122 is formed by forming the second support shaft 122 in the form of a tube.

Thus, when the dehydration liquid of the conical inner cylinder 120 is discharged to the outside of the cylindrical outer cylinder 120 along the axial direction of the cylindrical outer cylinder 110, especially along the axial center, the discharge structure becomes extremely simple.

The operation of the present embodiment will be described below.

First, before the apparatus, a polymer coagulant is added to a reactor containing water containing sludge so that the polymer coagulant and sludge are mixed, and the sludge mixed with the polymer coagulant is seen in the sludge inlet 111 of the screw dehydrator. Input.

In this way, the sludge to be treated is in a form in which flocculated sludge agglomerated with a flocculant and water are mixed.

The treated sludge introduced into the sludge inlet 111 is compressed while being transported upward by the screw member 130, specifically, the pressurizing screw plate 131 located under the sludge to be treated, and the compressed sludge to be treated at the same time. Water (dehydration liquid) located in the upper portion of the sludge to be treated is introduced into the screw member 130 through the dehydration hole 132a of the dewatering screw plate 132 located at an upper portion thereof, and the dehydration liquid is connected to the communication port 124. After passing through the inside of the conical inner cylinder 120 is discharged to the outside of the cylindrical outer cylinder 110 through the dehydration liquid discharge path (122).

The sludge concentrated and dehydrated as described above is discharged to the outside of the cylindrical outer cylinder 110 through the sludge outlet 112.

As described above, the sludge to be treated is compressed while being pressurized and transported upward by the pressurizing screw plate 131 located at the lower portion thereof, and is dehydrated through the dehydration hole 132a of the dewatering screw plate 132 located at the upper portion. By using the inside of the conical inner cylinder 120 as a path through which the dehydration liquid is discharged, the overall structure is extremely simple while the dehydration efficiency is high.

In addition, the present embodiment is to dewater the sludge to be treated using the difference in specific gravity of water and flocculated sludge, to prevent the phenomenon that the dehydration hole of the screw plate for dehydration is blocked. Therefore, this embodiment does not require an apparatus for cleaning the clogged dewatering hole which is basically necessary in the prior art.

4 and 5 illustrate that the vertical screw dehydrator of the present embodiment can be used in connection with other equipment.

4 is a view illustrating a state in which a vertical screw dehydrator and a conventional general dehydrator are connected and used in this embodiment.

The dewatered sludge discharged to the sludge outlet 112 of the vertical screw dehydrator 100 may be introduced into a conventional general dehydrator 200 and finally dewatered.

In such a sludge treatment system, since the dewatered sludge (concentrated sludge) introduced into the dehydrator 200 is firstly dehydrated, the dewatering load of the dehydrator 200 can be significantly reduced.

The dehydration liquid discharged to the dehydration liquid discharge passage 122 of the vertical screw dehydrator 100 is introduced into a conventional general filter 300 and finally filtered.

In such a sludge treatment system, since the dehydration liquid flowing into the filter 300 is primarily filtered, the filtration load of the filter 300 may be significantly reduced.

That is, the vertical screw dehydrator may be used independently, but may also be used for the purpose of reducing the dehydration load of the dehydrator or the filtration load of the filter by being installed in the front of a conventional dehydrator or a conventional filter.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention can be used to dewater or concentrate the sludge to be treated composed of water and flocculated sludge.

Claims

A sludge inlet through which a sludge to be treated is introduced at a lower end thereof, and a sludge outlet through which dehydrated sludge flows out and a cylindrical outer cylinder disposed vertically;

A conical inner cylinder which is provided rotatably inside the cylindrical outer cylinder concentrically with the axial center of the cylindrical outer cylinder, and has a diameter gradually increasing toward the upper end from the lower end of the cylindrical outer cylinder;

The radially outer end maintains a diameter corresponding to the inner diameter of the cylindrical outer cylinder, and the radially inner end is fixed to the conical inner cylinder while spirally wound along the outer circumferential surface of the conical inner cylinder and is rotated together with the rotation of the conical inner cylinder. The pressing screw plate for pressing the radially outer end portion is connected to the radially outer end portion of the pressing screw plate and the radially inner end portion is spaced downwardly with respect to the pressing screw plate while the outer peripheral surface of the conical inner cylinder Screw member is fixed to the screw member comprising a screw plate for dewatering a plurality of dehydration holes are formed;

A rotation drive member provided to rotate the conical inner cylinder;

It is made, including

The sludge to be treated consists of water and flocculated sludge having a specific gravity greater than that of water,

Due to the difference in specific gravity between the water and the flocculating sludge, water suspended in the upper part of the flocculating sludge is discharged as a dehydration liquid through the dehydration hole of the screw plate for dehydration.

A communication port is formed in the main surface of the conical inner cylinder so that the dehydration liquid introduced between the pressurizing screw plate and the dewatering screw plate through the dehydration hole flows into the conical inner cylinder.

Dehydration liquid discharge path for discharging the dewatering liquid introduced into the inner cylindrical cylinder to the outside of the cylindrical outer cylinder along the axial direction of the cylindrical outer cylinder is formed

Vertical screw dehydrator, characterized in that.
The method of claim 1,

And a radially outer end portion thereof and a radially inner end portion thereof at the same height in the cross-sectional structure of the pressing screw plate, so that the pressing screw plate has a flat cross-sectional structure.
The method according to claim 1 or 2,

Vertical screw dehydrator, characterized in that the diameter of the dehydration hole is 0.01mm ~ 0.2mm.
A sludge treatment system comprising a vertical screw dehydrator according to any one of claims 1 to 3, and a dehydrator for receiving and dewatering dewatered sludge discharged from the vertical screw dehydrator.
A sludge treatment system comprising the vertical screw dehydrator of any one of claims 1 to 3, and a filter for receiving and filtering the dehydration liquid discharged from the vertical screw dehydrator.