KR100812821B1 - Dehydrator - Google Patents

Abstract

A dehydrating apparatus using gravity, pressurization, and electro penetration is provided to maximize the dehydration efficiency, clean a pressurization belt consistently, prevent oxidation of an electro penetrative drum, enable dehydration to be performed at both sides of the belt and the drum, and maximize the operating efficiency of the dehydrating apparatus. A dehydrating apparatus using gravity, pressurization, and electro penetration comprises: a frame; first and second guide rollers(21,22) installed on the frame and spaced from each other in a predetermined distance, and pressurization rollers(41-45) installed adjacently to the first and second guide rollers; an endless track type dehydration belt(23) which is wound on the first and second guide rollers and the pressurization rollers, and which has a plurality of dehydration holes(24) formed therein or is made of a mesh member to form a gravity dehydrating part for dehydrating sludge(200) by gravity between the first and second guide rollers; a pressurization belt(47) which is wound on the pressurization rollers and idle rollers(46a-46e) that are installed below the pressurization rollers, and which is wound on the pressurization rollers in a state that the pressurization belt is superposed onto the dehydration belt to form a pressurization dehydrating part for pressurizing and dehydrating the sludge dehydrated by the gravity dehydrating part; and an electro penetrative dehydration unit(60) installed on the frame to dehydrate the sludge pressurized and dehydrated by the dehydration belt and the pressurization belt by electro penetration. The electro-penetrative dehydration unit includes an electrode roller(61), a plurality of supporting rollers(62-65), a caterpillar(70), a power impressing unit(80), and an electrode roller cleaning unit(90).

Description

Gravity Pressurized Electric Penetration Dehydrator

The present invention relates to a dehydration apparatus, and more particularly, to a gravity pressurized electric permeation dehydration apparatus capable of multi-stage dehydration using gravity, pressurization and electropenetration.

In general, sludge (sludge) generated in wastewater and sewage treatment plants uses a polymer flocculant to purify water, and sludge agglomerated by the polymer flocculant is difficult to dehydrate. According to the sludge dewatering rate, there is a big difference in sludge disposal cost and recycling range. Also, if the water content of sludge can be significantly reduced, not only the waste cost is reduced but also the solid components of the sludge are fueled. It is also very economically added value, such as being able to recycle into a furnace. However, the conventional simple pressurized dewatering device has a limitation in the dewatering of the wastewater sludge, so in recent years, an electropenetrating dewatering device having good dewatering efficiency for dewatering the sludge has been utilized.

The electro-osmotic dewatering device is to remove the water combined with the sludge by ion mobility, a rotating drum serving as a positive electrode and a water-permeable pressing belt formed to cover the outer circumferential surface of the rotating drum. And, it consists of a filter belt formed to overlap the surface of the dehydration region of the rotating drum and the pressing belt.

Japanese Patent Application Laid-Open No. 56-60604 and Korean Patent Application No. 1993-0010856 disclose an electroosmotic sludge dewatering apparatus.

The disclosed electro-osmotic sludge dewatering device forms an electric field by applying a constant voltage between the drum and the pressing belt so that the charged water in the electric field moves to the electrode opposite to the charge carried by the sludge particles by electrophoresis and capillary action. By this separation, dewatering from the sludge occurs.

On the other hand, the Applicant rectifies the three-phase alternating current for each phase (R, S, T) so as not to cause a voltage drop, and converts the voltage into DC voltage pulses, and then applies a sequential voltage due to a phase difference to the electrode to dehydrate the voltage. It has been filed in the Republic of Korea Patent Application No. 2003-39471, which is an electropenetrating dehydration device that prevents loss and maintains a constant voltage at all times to increase dehydration performance.

The applicant has applied for a sludge dewatering device that can maximize the dewatering efficiency of the sludge with high moisture content by continuously researching and developing the dewatering device.

It is an object of the present invention to provide a gravity pressurized electric penetration dewatering device that can maximize dewatering efficiency by dewatering sludge in multiple stages using a compressive force and an electropenetration method to gravity.

Another object of the present invention is to provide a gravity pressurized electroporation dehydration apparatus capable of continuously washing the pressurized belt and preventing oxidation of the electropenetrating drum.

Still another object of the present invention is to provide a dehydration apparatus that allows dehydration to occur at both sides of the belt and the drum and maximizes the operating efficiency of the dehydration apparatus.

Gravity pressurized electric penetration dewatering device of the present invention for achieving the above object

Gravity dewatering means for dewatering the sludge by gravity, pressurized dewatering means installed on the outlet side of the gravity dewatering means to pressurize and dewater the sludge dewatered primarily by the gravity dewatering means, and the outlet side of the pressurized dewatering means. And an electrode roller which is installed in the sludge dewatered by the pressurized dewatering means and is insulated by an insulating means installed on the outer circumferential surface of the electrode roller and has a caterpillar in which one side is pressed in contact with the outer circumferential surface of the electrode roller. It is characterized in that it is provided with an electrical penetration dewatering means.

Alternatively, the gravity pressurized electric penetration dewatering device according to the present invention for achieving the above object is

A frame, first and second guide rollers installed to be spaced apart from each other by a predetermined distance, press rollers installed on a side adjacent to the first and second guide rollers,

An endless orbital dewatering belt which is caught by the first and second guide rollers and the pressure roller and is composed of a plurality of dewatering holes or mesh members and forms a sludge gravity dewatering part between the first and second guide rollers;

A pressurized dewatering part which is caught by the press rollers and the first idle rollers installed below the press rollers, is caught by the press roller while being overlapped with the dewatering belt, and pressurizes and dehydrates the sludge dewatered by the gravity dewatering part. Compression belt to be made,

It is characterized in that it is provided on the frame and provided with an electroosmotic dewatering means for electroinfiltration and dewatering the sludge pressurized and dewatered by the dewatering belt and the pressure belt.

In the present invention, the electro-osmotic dewatering means is installed on the first electrode on the outer circumferential surface and the electrode roller is caught on the outer circumferential surface, the second guide rollers and the electrode rollers installed around the electrode roller The caterpillar which overlaps with the clamped belt and is insulated from the electrode roller, the current applying means for applying current to the electrode roller and the caterpillar, and is provided on the side adjacent to the roller to clean the outer peripheral surface of the electrode roller and And washing means for polishing.

And suction suction dehydration means provided between the gravity dehydration unit and the pressurized dehydration unit or the gravity dewatering unit to dewater water from the sludge dehydrated by gravity.

Gravity pressurized electroporation dehydration apparatus according to the present invention can maximize the dewatering efficiency by dewatering the sludge in a multi-stage first by dehydrating the sludge having a relatively high moisture content by gravity and pressurizing and electroinfiltration.

One embodiment of the dehydration apparatus according to the present invention is shown in Figures 1, 2 and 3.

Referring to the drawings, the dewatering device 10 is installed on the frame 11, the gravity dewatering means 20 for dewatering from the sludge 200 by gravity, and is installed on the outlet side of the gravity dewatering means 20 is gravity Pressurized dewatering means 40 for dewatering by pressurizing the sludge dewatered primarily by the dewatering means, and the sludge dewatered by the pressurized dewatering means 40 installed on the outlet side of the pressurized dewatering means 40. And electric penetrating dewatering means 60 by relaying or inducing current.

The gravity pressurized electric penetration dewatering device 10 configured as described above will be described in more detail as follows.

Gravity dewatering means 20 of the gravity pressurized electric penetration dewatering device 10 according to the present invention is the first and second guide rollers 21 and 22 installed on the frame 11 so as to be spaced apart from each other by a predetermined distance, The plurality of pressure rollers 41-45 provided on the side adjacent to the first and second guide rollers 21 and 22, that is, the lower side frame 11 of the first and second guide rollers 21 and 22, may be disposed. Equipped. The first and second guide rollers 21 and 22 and the pressure rollers 41 to 45 are sequentially caught and a plurality of dewatering holes 24 are formed or an endless orbital dewatering belt made of a mesh member ( 23). Naturally, guide partitions for guiding the sludge 200 should be installed at both sides of the dewatering belt 23 between the first and second guide rollers 21 and 22.

Here, the first and second guide rollers 21 and 22 may be installed to be inclined with respect to the horizontal axis in the frame 11 so that the dewatering belt 23 caught therein may maintain an inclined state. That is, by allowing the second guide roller 22 to be positioned above the first guide roller 21 so that the dewatering belt 23 can be inclined between the dewatering belts 23 and the sludge along the dewatering belt. It is desirable to be able to dehydrate by gravity while being moved. In addition, the side adjacent to the first guide roller 21 is further provided with a dewatering belt cleaning unit 25 for washing the dewatering belt 23, the lower side of the side adjacent to the second guide roller 22 To store the dehydration liquid dehydrated by the first suction dehydration unit 26 for sucking and dewatering water from the sludge dehydrated primarily by gravity and the lower part of the dewatering belt 23 between the first and second guide rollers. A liquid tank 27 is installed.

The dewatering belt cleaning unit 25 may dewater the dewatering belt so that the dewatering hole may be washed using the washing water. The dewatering belt washing unit 25 may be in close contact with the upper surface of the dewatering belt adjacent to the first guide roller 21 to clean the area. A first cover member 25b having an opening portion 25a formed on a side corresponding to the washing area of the dewatering belt and the cover member 25b installed to clean the dewatering belt 23 so as to define A nozzle 25c for injecting high pressure washing water into the area is provided. A plurality of nozzles 25c for washing may be installed, and the washing water may be dehydrated by the gravity dewatering means to use a dehydrating liquid stored in the liquid tank 27.

The first suction dewatering unit 26 is installed on the outlet side of the second guide roller 22 and is positioned above the dehydration belt 23 to dewater by applying suction to sludge dewatered by gravity. A suction pump (not shown) that is in close contact with the bottom surface of the belt 23 and is connected to a second cover member 26b having a second opening 26a defining a suction area, thereby providing a suction force to the second opening 26a. C).

On the other hand, between the second guide roller 22 and the pressure roller 41 is provided with a tension applying unit 30 for applying tension to the dewatering belt 23, the tension applying unit 30 is a frame And a tension roller 31 which is rotatably supported by a take-up device (not shown) for fixing the lifting position and on which the dewatering belt 23 is caught. (See FIG. 3).

The pressurized dewatering means 40 is installed on the side adjacent to the tension drum 31 moving between the first and second guide rollers 21 and 22 to pressurize and dehydrate the sludge dehydrated by gravity. For the purpose, the first idler roller 46a installed adjacent to the second guide roller 22 and the plurality of idle rollers located at the lower side or side of the pressing rollers 41-45, that is, the second to sixth children Rollers 46b-46e. And a pressurizing belt 47 engaged with the first eye roller 46a, the tension roller 31, the pressure roller 41-45, and the 2-6 idle rollers 46b-46e.

The pressure rollers 41-45 or tension rollers 31 are radially extending arm members 41b-45b and 31b installed on the rotary shafts 41a-45a and 31a and the rotary shafts as shown in FIG. 4. And a first plate bar 41c-45c, 31c wound in a left screw direction in one direction from the center of the arm members 41b-45b, 31b, and a second wound in a right screw direction in the other direction from the center of the arm member. Plate bars 41d-45d and 31d may be provided.

The pressing belt 47 is connected to the dewatering belt 23 by a first idler roller 46a, a tension roller 31, and a pressing roller 41-45 which are installed adjacent to the first guide roller 22. It is preferable that the sludge moved between the overlapping dewatering belt 23 and the pressurizing belt 47 to be dewatered by the dewatering belt 23 and the pressing belt 47 can be overlapped.

And between the second guide roller 22 and the first idler roller and the tension roller 31 and at least one side of the dewatering belt 23 and the pressing belt 47 which are in close contact with each other from the sludge located between them A second suction dewatering unit 50 for dewatering using suction power is provided. The second suction dewatering unit 50 is substantially the same in configuration as the first suction dewatering unit 26. That is, as shown in FIG. 5, the second suction dewatering part 50 is in close contact with the dehydration belt 23 and has a third cover member 52 having a third opening part 51 defining a suction area. It is provided with a suction pump (not shown) that is connected to provide a suction force to the third opening (51). The third cover member may be formed in a hopper shape.

The third idler roller 46c on which the pressing belt 47 is caught is supported by the tensioning force of the pressing belt 46c on the tension roller 31. Here, the third idler roller 46c is preferably such that the pillow block supporting the rotating shaft can be suspended by the elastic member.

On the side adjacent to the fourth idler roller 46c, there is provided a pressurizing belt washing unit 55 for washing the pressurizing belt 47 by using air and water. The pressurized belt cleaning means 55 is for washing a plurality of dewatering holes or mesh pressurized belts 47 as shown in FIG. 6, and opening the pressurized belt 47 to define a washing area. A portion 56 is formed and includes a fourth case member 57 having an inner space for discharging the washing water through the opening 56. And installed in the fourth case member 57 to supply a high pressure air to the air injection nozzle 58 and the air injection nozzle 58 for injecting high pressure air to the pressure belt 47, And a connecting pipe 59 for supplying water to the internal space of the fourth case member 57 by being dewatered by the compressor (not shown) and the pressurized dewatering means 20. Although not shown in the drawing, the connecting pipe 59 may be provided with a pump.

The electropenetrating dewatering means 60 is installed in the frame 11, as shown in Figures 2 and 7 and the electrode roller 61 for relaying or inducing a three-phase alternating current, and the electrode roller 61 of the Caterpillar 70 is a plurality of support rollers (62-65) installed on both sides and the lower portion, and the contact rollers (62-65) are in contact with a portion of the outer peripheral surface of the electrode roller (61) (see Fig. 1) ) And a power applying means 80 for supplying power to the electrode roller 61 and the caterpillar 70.

 Here, the pressing belt is caught by the electrode roller 61 to insulate the caterpillar 70 from the electrode roller 61. That is, as shown in FIGS. 1 and 2, the pressing belt 47 and the caterpillar 70 are caught by the electrode roller 61 in an overlapping state. Therefore, the sludge dehydrated between the dewatering belt 23 and the pressure belt 47 of the pressure dewatering means is introduced between the pressure belt 47 and the electrode roller 61 caught by the pressure belt 47 to be caterpillar 70. ) Is dewatered by the rotating pressure belt 47 and the electrode roller 61 in close contact with the (). Here, the pressing belt 47 does not necessarily need to be interposed between the electrode roller 61 and the caterpillar 70.

As shown in FIG. 8, the electrode roller 61 may be formed by insulating split electrodes 61a that are insulated from each other on an outer circumferential surface and spaced apart from each other by a predetermined interval. On the outer circumferential surface of the support drum 61b of the electrode roller 61 or the support frame, a channel-shaped electrode holder 61c for fixing the divided electrode 61a may be installed. As shown in FIG. 9, the electrode holder 61e of the electrode roller 61 may be formed of a support bar installed at a predetermined interval on the outer circumferential surface of the support drum 61b. In this case, the split electrodes 61a may have both ends. Can be fixed by the fastening member 61f. The electrode of the electrode roller, that is, the split electrode, preferably uses an iron alloy containing 14% by weight of Si and 0.1% by weight of Mg.

In the case of using the ferroalloy containing 14 wt% of Si and 0.1 wt% of Mg, it was found that the applied current density was 2.16 A / m 2. This indicates that the applied current density is relatively higher than that of 1.09 A / m 2 when stainless is used as the split electrode material.

The split electrode 61a may further include a nonmagnetic layer having a higher magnetic concentration such as copper or aluminum on a lower surface corresponding to the outer circumferential surface of the electrode roller 61. The nonmagnetic layer may be formed by attaching a nonmagnetic plate (c) made of copper or aluminum to the lower surface of the split electrode 61a, that is, the lower surface corresponding to the electrode roller.

As shown in FIGS. 2 and 10, the caterpillar 70 includes connection chains 71 on an orbit and unit electrode members 72 installed at predetermined intervals on the connection chains 71. A plurality of through holes 73 for dewatering are formed in the unit electrode members 72. The caterpillar 70 is not limited to the above-described embodiment may be made of a metallic mesh belt. As shown in FIG. 11, the unit electrode member 72 of the caterpillar 70 may use a channel-shaped bar to reduce its weight. In addition, as shown in FIG. 12, the unit member 75 of the caterpillar is formed by bending a plate-like member, and the fixing portion 75a fixed to the connecting chain 71 and the length of the fixing portion 75a. The number of vertical bending portions 75b and 75c that are bent upward from both ends in the direction, that is, toward the outer circumferential surface side of the electrode roller, and the number of bent inwards parallel to the fixing portions 75a from the ends of the respective vertical supporting portions 75b and 75c. Evaluating pressure parts 75d and 75e and vertical reinforcing parts 75f and 75g which are bent from the edges of the horizontal pressure parts 75d and 75e to the fixing part 75a side. Such a structure can improve structural strength while reducing the unit weight of the unit member 75, and dehydration can be performed between the horizontal pressing parts 75d and 75e, thereby increasing the dewatering efficiency.

 The power applying means 80 is for supplying power to the electrode roller 61 and the caterpillar 70, applying a positive voltage to the split electrode 61a of the electrode roller 61, the caterpillar ( 70 is provided with a direct current power supply for applying a voltage of the cathode or an alternating voltage application for applying a three-phase alternating voltage of 40 Hz or more or a high frequency of 40 Hz or more to the electrode and the caterpillar 70 of the electrode roller 61; Can be. A brush in contact with the unit electrode or the caterpillar may be provided.

On the other hand, on the outer circumferential surface of the electrode roller 61 an electrode roller cleaning means 90 for cleaning the outer circumferential surface of the electrode roller 61 in order to prevent the electrode from being oxidized by the sludge or the like to smoothly supply power. Equipped. The electrode roller cleaning means (90) is rotatably installed on the frame and the arm (91) is elastically biased on the outer peripheral surface side of the electrode roller (61), rotatably installed on the arm (91) the electrode roller A polishing brush 92 for polishing the outer circumferential surface of 61 and a motor provided on the arm to drive the polishing brush 92 are provided. Naturally, the non-rotating polishing brush may be fixed to the arm 91 here. In the case of washing the electrode roller 61 using the polishing brush, it is preferable to dilute acetic acid and use it as washing water.

Reference numeral 100 is a driving motor for driving the dehydration belt and the pressing belt by driving the first guide roller 21. Here, the dewatering belt and the pressing belt and the caterpillar or the rotating drum may be driven by separate driving means.

 Referring to the operation of the dehydration apparatus according to the present invention configured as described above are as follows.

First, in order to dewater the sludge using the dewatering apparatus according to the present invention, the dewatering belt 23 between the first and second guide rollers 21 and 22 in a state driven by the motor of the dewatering apparatus 10. ) To supply the sludge 200 for dehydration. Since the sludge 200 supplied as described above has a plurality of dehydration holes 24 formed in the dewatering belt 23, the dewatered water is dehydrated by gravity and the dewatered water is stored in the liquid tank 27. Here, since the dewatering belt supported by the first and second guide rollers 21 and 22 is inclined toward the second guide roller 22, sludge or water made by dehydration by gravity while the dewatering belt 23 is moved. It moves with separating sludge and sledge.

In this way, the sludge conveyed by the dewatering belt 23 is sucked and dehydrated by the first suction desorbing member 26 installed on the side adjacent to the second guide roller 22. That is, a plurality of dehydration holes are formed in the dewatering belt 23, and suction dehydration is performed by suction force acting by the suction device through the first opening of the first cover member 26b.

 The sludge dewatered by the gravity dewatering means 20 is dewatered by the pressurized dewatering means 40. That is, the dewatering belt 23 is rotated in close contact with the pressing belt 47 to dewater the sludge dehydrated by the gravity dewatering means 20. In this process, since a plurality of dehydration holes are formed in the dewatering belt 23 and the pressing belt 47, they are dewatered from the pressurized sludge through their dehydration holes. In particular, since the third idler roller 46c is rotated while being pressed by the tension roller 31, the third idler roller 46c may pressurize the sludge between the pressing belt 47 and the dewatering belt 23 to increase the dewatering efficiency. The pressure rollers 41-45 or the tension rollers 31 are wound in the first plate bar 41c-45c and 31c wound in the left-hand direction from the center of the arm members 41b-45b and 31b as shown in FIG. 4. ) And second plate bars 41d-45d, 31d wound in the right-hand direction from the center of the arm member to prevent the pressing belt or the dewatering belt from being peeled off from the pressing roller or the dewatering roller 31 during driving. Can be.

The sludge dehydrated by the pressurized dewatering means 40 is moved to the electrofiltration dewatering means 60 and dewatered. The sludge introduced between the outer circumferential surface of the electrofiltration dewatering means 60 and the pressure belt 47 is dehydrated. It is dehydrated by electric infiltration dehydration. In this process, the split electrodes 61a installed on the outer circumferential surface of the electrode roller 61 are contaminated or oxidized by sludge to reduce the electric penetration dehydration. The outer circumferential surface of the electrode roller 61 has a brush of the electrode roller cleaning means. Rotating and cleaning and polishing the surface of the electrode can be equipped with a deterioration of the electrical penetration by the electrode roller contamination. In addition, since a plurality of through-holes 73 are installed in the unit electrode 72 of the caterpillar 70 in close contact with the electrode roller 61, the discharge of water due to the pressurization may be performed smoothly. In particular, when the unit member 75 of the caterpillar 70 is formed by bending the plate member as shown in FIG. 12, since the electrode roller 61 and the horizontal pressurizing parts 75d and 75e come into contact with each other, the pressure belt The contact area with (47) can be reduced, and further, the frictional resistance with the pressurized belt can be reduced. In addition, the reduction of the frictional resistance can reduce the occurrence of magnetism, and consequently can reduce the power consumption.

In addition, since the vertical support portions 75b and 75c are spaced apart from each other by a predetermined interval, resistance of dehydration during pressurization may be reduced.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

The gravity pressurized electric permeation dewatering device according to the present invention configured as described above is a manufacturing process of various products requiring coal, food waste or dewatering from various industrial wastes, mines, including sludge dewatering in sewage treatment plants and sludge dewatering in wastewater treatment plants. There is an advantage that can be applied to.

1 is a perspective view of a gravity pressurized electric penetration dehydration apparatus according to the present invention,

Figure 2 is a side view schematically showing a gravity pressurized electric penetration dewatering device according to the present invention,

3 is a perspective view showing the tension applying unit body;

Figure 4 is a perspective view showing the pressurized roller or tension roller,

5 is a perspective view showing an extract of the second suction dehydration unit,

Figure 6 is a perspective view showing an extract of the pressing belt dewatering means,

7 is a perspective view showing an extract of the electrical penetration dehydration device,

8 and 9 are separated perspective views showing embodiments of the electric roller,

10 is a perspective view showing an extract of a caterpillar,

11 is a perspective view showing the unit electrode of the caterpillar,

12 is a perspective view showing another embodiment of a caterpillar.

Claims (15)

delete Gravity dewatering means for dewatering the sludge by gravity, pressurized dewatering means installed on the outlet side of the gravity dewatering means to pressurize and dewater the sludge dewatered primarily by the gravity dewatering means, and the outlet side of the pressurized dewatering means. An electrode roller which is installed in the sludge dewatered by the pressurized dewatering means and is insulated by an insulating means installed on an outer circumferential surface of the electrode roller, and a caterpillar having one side pressed against the outer circumferential surface of the electrode roller. Equipped with one electrical penetration dewatering means, The gravity dewatering means is a dewatering belt on an endless track consisting of a plurality of perforations or mesh members caught by the first and second guide rollers and the first and second guide rollers which are installed with a difference in height at predetermined intervals in the frame. Gravity pressurized electric penetration dewatering device, characterized in that it is provided with. Frame, First and second guide rollers installed on the frame to be spaced apart from each other by a predetermined interval, and pressure rollers installed on a side adjacent to the first and second guide rollers; An endless orbital dewatering belt which is caught by the first and second guide rollers and the pressure roller and is composed of a plurality of dewatering holes or mesh members and forms a sludge gravity dewatering portion between the first and second guide rollers; Pressurized dewatering to catch the press rollers and the first idle rollers installed below the press rollers, and pressurize and dewater the sludge dehydrated by the gravity dehydrator by being caught by the press roller while overlapping the dewatering belt. A pressurizing belt Gravity pressurized electroporation dewatering device, characterized in that it is provided in the frame provided with an electroosmotic dewatering means for electroinfiltration and dehydration of the dewatering belt and the pressurized dewatered sludge by the pressurizing belt. The method of claim 3, wherein The electric penetration dewatering means is provided with a split electrode on the outer circumferential surface and the electrode roller is caught on a portion of the pressing belt on the outer circumferential surface,  A caterpillar which is overlapped with the second guide rollers installed around the electrode roller and the pressing belt caught by the electrode roller, and is insulated from the electrode roller; Current applying means for applying current to the electrode roller and the caterpillar; Gravity pressurized electroporation dewatering device, characterized in that provided on the side adjacent to the electrode roller provided with an electrode roller cleaning means for washing and polishing the outer peripheral surface of the electrode roller. The method of claim 4, wherein The washing means is installed adjacent to the electrode roller and gravity pressure electric penetration dewatering device characterized in that it comprises a brush for polishing and cleaning the outer peripheral surface of the electrode roller. The method of claim 3, wherein And a suction dehydration means provided between the gravity dewatering portion and the pressurized dewatering portion or the gravity dewatering portion to dewater water from the sludge dehydrated by gravity. The method of claim 3, wherein In order to apply tension to the dewatering belt and the pressurized belt which is overlapped and moved between the gravity dewatering unit and the pressurized dewatering unit is installed to be slidable by the frame, and further provided with a tension roller to which the superimposed dewatering belt and the pressurizing belt are caught. , And the first idler roller selected from one of the first idler rollers is pressed by the tension pulley so as to pressurize the overlapping and rotating tension belt and the pressing belt. The method according to claim 3 or 7, The pressure roller has a rotating shaft, arm members installed in the rotating shaft and extending in a radial direction, a first plate bar in a left screw direction in one direction from the center of the arm member, and a right screw direction in the other direction from the center of the arm member. Gravity pressurized electric penetration dewatering device characterized in that it comprises a second plate bar wound by. The method of claim 3, wherein And a pressure belt washing means for dewatering the pressure belt by using the water dehydrated by the gravity dewatering unit. The method of claim 4, wherein And the current applying means is a three-phase alternating current power source of 40 Hz applied to the electrode roller. The method of claim 4, wherein And the current applying means comprises a direct current power supply for applying an anode to the electrode roller and a cathode to the caterpillar. The method of claim 4, wherein Gravity pressurized electric penetration dewatering device, characterized in that the split electrode is installed on the outer peripheral surface of the electrode roller is coupled and detachable by the electrode holder. The method of claim 4, wherein The caterpillar is a gravity pressurized electroporation dewatering device characterized in that it comprises a connecting chain on the endless track and the unit electrode member is formed at a predetermined interval on the connecting chain and a plurality of through holes formed. The method of claim 4, wherein The caterpillar is an endless track connection chain, a fixed part fixed to the connection chain by being installed at a predetermined interval on the connection chain, and vertical support parts bent from the both ends of the fixing part in the longitudinal direction to the outer peripheral surface side of the electrode roller. And unit electrode members having horizontal pressing parts bent inwardly parallel with the fixing part from the end of each vertical support part. The method of claim 4, wherein The split electrode is a gravity pressurized electroporation dehydration apparatus, characterized in that consisting of an iron alloy containing 14% by weight of Si, 0.1% by weight of Mg.

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