JPS5817810A - Sludge dehydrator - Google Patents

Abstract

PURPOSE:To improve dehydration effect while maintaining a negative pressure state by providing a water suction chamber and making the filtrate flowing in air suction pipes interruptable. CONSTITUTION:A titled device consisting of an endless screening belt which conveys sludge 16 and filters the water in the sludge, a suction chamber 26 which sucks water and a suction means which sucks the air from the chamber 26 to a prescribed negative pressure through air suction pipes 54. The sludge 16 is conveyed with said belt 18 continuously from a filtration zone 10 via a suction zone 12 to a compression zone 14 where the sludge is dehydrated. The chamber 26 is provided in the zone 12 to prevent the entry of the filtrate into the pipes 54. A negative pressure state is maintained and a dehydration effect is improved.

Description

[Detailed description of the invention] The present invention relates to a sewage sludge dewatering device, and particularly relates to a sewage sludge dewatering device.

Scree the water in sewage sludge! It relates to a device that dewaters sludge by suctioning it through a secondary belt.

Has it been implemented for a long time? The method of naturally dewatering sludge using an IJ mud drying bed has become possible due to the lack of space and labor. Therefore, it is necessary to artificially dehydrate the sludge to the point where it can be scooped up with a hoe, and to make it into an i-form that is easy to transport.

Various devices have been proposed to achieve this purpose. For example, after using a relatively large amount of coagulation accelerator,
An apparatus is known in which a considerable amount of negative pressure is applied to the sludge spread on an endless scree rut from below the Jungbelt to dewater the sludge by suction.

However, in conventional devices of this type, a large amount of filtrate dehydrated from sludge flows into the suction device itself that supplies negative pressure, making it difficult to supply sufficient negative pressure. arise.

The present invention may be made in consideration of the above-mentioned points, but its purpose is to provide a sludge dewatering device that can reliably supply negative pressure and reliably achieve the sludge dewatering effect by suction. That's true.

That is, the sludge dewatering apparatus of the present invention includes an endless screen that transports sludge and allows moisture in the sludge to pass through, and a daver belt.
It consists of a suction chamber that suctions the moisture that passes through the belt, and a suction means that sets the inside of the suction chamber to a predetermined negative pressure state 11 through an intake pipe that communicates with the side of the suction chamber. Features.

In the present invention, since the suction pipe is connected to the side of the suction chamber, it is possible that the v-liquid, which is fed through the screen Jungbelt and falls to the bottom of the suction chamber, flows into the suction pipe. The inside of the suction chamber can be always set to a negative pressure state, and the sludge dewatering effect by suction can be reliably achieved.

Another feature of the invention is that the process comprises artificially dewatering sewage sludge by using an endless screening belt and spreading the sludge on said screening belt, with or without the addition of coagulation accelerators. , Its characteristic is that the sludge spread on the screening belt passes continuously through a filtration zone, a slightly low-pressure suction zone, and finally a squeezing zone.

By combining dehydration with filtration, suction, and compression, it can be done at low cost.
The bulk φ dehydration effect can be obtained.

Hereinafter, preferred specific examples of the present invention will be explained based on the drawings. The frant as a sludge dewatering device consists of three consecutive zones: a transit zone 170, a suction zone 12 and a squeezing zone 14. Sewage sludge 16ti is introduced via a stirring device 62. The agitation device 62 is equipped with a drive mechanism for agitation scree, and the introduced sludge 16 is mixed with a coagulation accelerator 6.
Mix with 8. lf here! It should be noted that the amount of coagulation accelerator required in this new plant is significantly less than that required in the conventional plant. From the filtration press 162, it is dispersed onto the endless screening belt 18. Screening belt 18 in this zone
is arranged at a slight upward slope in the direction of travel.

The dispersing device or roller 32 is connected to the screening belt 18.
It functions to distribute sewage sludge on top with an even width and thickness. Due to this equalizing effect, at the same time the screening belt 18 is coated with an even layer of sludge before reaching the suction zone 12.

The dispersing device or roller 32 may be an applicator knife 34 disposed transversely to the direction of travel of the screening belt 18 and spaced apart from the belt 18. The applicator knife is arranged perpendicularly to the surface of the screening pel (18) according to FIG. 1a. However, it may also be arranged as in FIG. ib, in which case the deformation dispersion means 3
6 is inclined in the direction of movement of the screening belt 18.

It is also possible to use a roller 32 as shown in FIG. 1 instead of the dispersing knife. Similarly, the rollers marked with #32 are placed at an adjustable distance from the screening belt, may be of the free-rotating type, or the screening belt) 18
The roller 32 may be connected to a drive mechanism that rotates the roller 32 in the advancing direction or in the opposite direction. The rollers completely disperse and spread the sludge 16 onto the screening pel 18. Filter zone 10 with any type of dispersion device
be placed close to the end in the direction of travel.

In the filtration zone, a screening pel (18) functions as a furnace cloth. That is, a portion of the moisture contained in the sludge 16 freely flows down through the screening belt 18 solely by its own gravity.

Actuation takes place without applying pressure. That is, there is no suction from below the screening belt 18, and there is no -
No pressure is applied; however, the pressure applied by the dispersion device is insignificant. Falling moisture is collected in a nozzle 76 and then drained into a sump 56 via a pipe 78m.

A tensile roll 80 of the screening belt 18 is installed within the V passing zone 10.

The suction zone 12a is directly connected to the rear of the filtration zone IO in the direction of movement. The suction zone 12 essentially consists of a completely closed suction chamber 26. A permeable support member 22 is mounted on top of the suction chamber 26 over which the screening belt 18 slides and unrolls onto the screening belt 18 to convey the nine sludge cakes 16. The support member 24 may be a grid plate or perforated grate or some other suitable flat permeable dent-like member with openings 24 of some shape; the sludge cake 16 is inserted into the chamber 26 from above the openings 24;
And the elastic seals attached to the side frames on both sides seal the passage of the screening belt 18 and reliably function as side guides and seals.

Ninth, the chamber 26 is provided with a side opening 52 that connects to a suction/extraction device 54 for establishing a slight low pressure, for example on the order of 500-2000 mwmAy. The opening 52 is disposed on the side of the chamber 260 at a considerable distance from the holding tank 42 disposed below, so that there is no risk that the aspirated fluid will flow into the suction opening 52; may be collected in the tank. The arm fs4 is connected to the collection ear 85, and the /4 ear 85 is guided to the discharge trap 84. The water entrained in the discharge trough f84 is captured/transferred to the drainage sump 5 via the pipe 86.
Sent to 6th. A vacuum pump 88 as suction means, schematically illustrated, serves to establish a low pressure and is connected via a pipe 87.

The water sucked into the chamber 26 from the sludge 16 and collected in the holding tank 42 flows in an inclined direction and flows into the pipe f43 from the outlet 40. The above-mentioned 4-ear 4B extends to the lowest part of the water surface of the drainage basin 56], and since low pressure prevails in the chamber 26, a part of the 4-ear 4B formed, for example, as a transparent material/die l. At any given time, the F fluid is rising, so that the degree of this rise can be used as a measure of the low pressure present in chamber 26.

Details of the nine compression zones 1-4 connected to the rear of the suction zone 12 are shown in the left-hand part of FIG. In the squeezing zone 14 the screening bell 18 rotates along a relatively large diameter impermeable drive roller 20.

The sludge 16 pre-dried in the filtration zone 1O and the suction zone 12 is conveyed in the advancing direction from the inlet of the compression zone 14 via tensile rollers 2, 8&. It is squeezed. The squeeze 4i) 3G is permeable) and is driven along the squirrel (228) through a total of three glues (228) in this embodiment. 9
28b is fixedly arranged, the axis of said tensioning roll or roller 28b can be formed as a support and pivot axis of the tensioning four-roll 2-a;
The shaft of the roll 28b is an extension rod 94 whose length can be freely adjusted.
The length of the support can be adjusted by, for example, two opposing screws and one threaded sleeve surrounding these screws.

By doing this, the distance between the axes of the rollers 28b and 28a is adjusted, and the tension of the squeezing belt 30 is also adjusted, and by adjusting this tension, the pressure applied to the driving roller 20 and thus the screening. The pressure applied to the belt) 18 is adjusted and blocked, and the screening belt 1B and the pressing belt 3
0 ÷ sludge cake 1 The pressure applied to the 16 can be adjusted. Furthermore, the axis of the tension roll or roller 28m may be loosely fixed in a position at an adjustable angle from the parallel line of the screening belt 18 in the direction of the arrow, so that the sludge cake 16 is Gradually, it is sent to the pressing process.

The squeezing takes place between the screening belt 18 and the squeezing belt 30 in the area of the drive roller 20.

Since the driving roller 20 is impermeable, the water remaining in the sludge cake 16 passes through the squeezing belt 30 and is collected in the holding tank 9OK via the drain tank 56.
is discharged.

Although not necessary, a slotted suction port 60 may be opened and connected to the suction collection port 4'85 to assist in this process. The area Kll is guided and faces the compression belt 30. It is sucked in by the suction port 60 and the
(by conventional simple equipment, not shown) and then transported to a holding tank 90.

In many cases, the papery pan 1' of sludge material from the sludge cake 16 in the squeezing zone 14? 4 is formed and can be easily transported via the company's conveyor belt 75) and later removed from the plant in a suitable manner.

As is clear from the figure, the loop angle of the screening belt 18 around the drive roller (2200 m) is small, so that the paper-like breadcrumbs 4 of sludge material can easily be separated into two pieces. Move away from the belt.

The press bell (3G) on its way back inside the press zone 14, ie the press belt between the rollers 28 and 28b, can be cleaned of adhering sludge particles by means of a suitable cleaning device 73). In this case, the water is gradually dehydrated in stages and the opening of the Ryosurusha pressing belt 30 is opened and screened! There is no tendency for the water to enter the opening of the belt 18 and adhere to the belt ζ, so the amount of water required for the cleaning process aimed at completely cleaning the press belt is extremely small, and the cleaning process is also sometimes performed. Furthermore, the cleaning of the screening belt 180 on the way back can be carried out in a simple manner by means of the drive reeler 20, a separate drum controller 79, and the freshwater utilization device 77 located in the OUK. . The water is collected in a small tank at the cleaning head office and conveyed to the wastewater 115i1 via the tube 91.

A must have for the cleaning process! The water is supplied via the water pipe 50. Also, a relatively clean liquid may be used.

Finally, the belt 18 that passed through the Ntrolov 9 is guided to the primary tensioner 4-280, passes through this tensioner, and passes through the 9th screen/-4
#) 111 Start a new cycle necessary for Hiro series 11.

In addition, even if the suction is formed in multiple stages 5 and the low pressure is gradually increased in one direction to the stage 41, it will not work (Wk suction zone O multi-stage structure 11EK), even in the initial stage 1 carefully. Regardless, a high go mobilization is achieved in the final suction stage and a smooth transfer of the sludge cake to the squeezing zone is achieved.

FIG. 2 is an overall view showing another specific example of the present invention. Among these examples, those with the same reference numerals as those in FIGS. 1, 11, and 1b are as follows:
Since the components are similar to those in the previous example and they function in the same way, detailed explanations regarding them will be omitted. It will be destroyed. A pressing belt 30 is placed on top of this sludge. This pressing belt runs in the conveying direction Kjl1 at the entrance of the pressing noon 14 in front of the ten V sun roller 28.

The squeezing bell) 30 is transparent, and in this variant, it is guided through three rollers 2g and a pan of 29.39, and is driven by the screening belt 18. The take-up roller 29 is in a fixed state, and the axis of the tension roller 28 may be formed as a support and pivot axis for the roller 29. The axial distance between the rollers 28 and 29 is adjustable. ) The squeezing bell) 3040 tension can be adjusted, and through the consistency of this tension, the pressing force on the sludge mass 16 between the screening belt 18 and the squeezing bell) 30 at the same time on the drive roller 20 can also be adjusted. becomes. Further, the tension roller 280 shaft can be fixed at a position slightly angled from the parallel line of the chain 9-Jungbel 18 in the direction of the arrow. This is to slowly compress the sludge mass 16 with slight shear. Such a configuration is the same as the above-mentioned example. In the compression zone 14, a paper-like band or crushed sludge material is generated from the sludge mass 16. This easily crawled away through the screening route 82 and formed the fourth drainage zone! - to the container 15 - can be transported in any suitable manner.

The nogdeg zone 1s consists of a number of rollers whose axes are mounted horizontally to the screening belt 18.820 (transverse to the direction of conveyance) and to the screening belt 18.82.

The rollers 78 are horizontal in the conveying direction and are mounted longitudinally with respect to one another so that the screening belts 18,82 guided between the rollers run in an undulating manner during operation. The screening belt 82 is guided around a turning roller 84 before and after the jig deguson. This screening belt 82 is also formed as an endless belt.

The sludge mass is squeezed! After passing through the tube 14 and falling onto the screening belt 82, the sludge mass is conveyed while being held between the two screening belts 18 and 82, and then conveyed between the guide rollers 78 in a wave-like interlocking manner. At this time, the sludge mass is sufficiently compressed and sheared by both the compressive stress and the Kll shear stress. This further drains the sludge mass.

Water removed in the Gudeda zone 15 is directly sent to the receiving tank 7.
6 flows into the interior. Since this receiving water tank is an integrated component of the entire device, the entire device enclosed by the casing 86 can be installed as a tight structural unit anywhere in any desired location. After passing Zogdeg Zone 150, Sludge Mass 1
6 is lifted up from the deflection roller 84 and placed on the conveyor belt 88 .

The drained sludge mass is carried away in a very good manner by means of this conveying belt.

In order to be able to adjust the degree of shear stress, the guide rollers 7B, in particular the upper rollers, are mounted movably transversely to the conveying direction. In particular, the sigdegnone may be divided into two separate steps, in which case the longitudinal offset of the blade in the f41 process is less than 1 in the wE2 step, so that in the second step the 11. A large shear stress is also generated. At the end of each step, the rollers may be directly interlocked, so that the shear stress causes the sludge mass to be compressed again by the compressive stress.

Finally, the screening belt 18 is guided to the tension roller 80, and behind this roller 800, the screening belt 1B starts circulating anew. This circulation is necessary for continuous operation.

Note that even if a fourth drainage zone is added, the structural dimensions of the entire sludge dewatering device can be reduced.

Suction the fourth drainage noon! - It is possible to arrive at K111 below K111.

As described above, in the present invention, a suction channel/4 is provided for sucking the moisture passed through the screening route, and the trachea on the ΔO side of this channel communicates with the suction channel/4 for sucking the moisture passed through the screening route. Since the inside of the suction chamber 1 is set to a predetermined negative pressure state by the means, it is possible to prevent as much as possible the filtrate that falls to the bottom of the suction chamber d from flowing into the suction pipe. The chamber/electronic chamber can always be set to a negative pressure state 11, and the effect of dewatering the sludge by suction can be ensured.

Some examples of one mode of implementing the invention are listed below.

(1) A patent claim characterized in that the squeezing zone is a device for the IV row 90 section Kl of the screening belt o II l! The device according to (t) or (2).

(2), - The screening belt passing through the filter passes through the two-cloth shape O filtration zone very freely, and drives the front upper part of the suction chamber which is not covered by the support member with the suction belt,
Patent claim o111!1(j), characterized in that the pressing zone is subjected to the pressure of an endless pressing belt guided by at least 42 rows 2.

1. , , (2) and the device according to any one of the preceding sections.

(3) Claim I characterized in that the screening belt is guided over an impermeable surface with a squeeze iron.
! (1) , tz>* and the device according to any one of the above items.

(4) The apparatus according to claim 8 (1) or (2), characterized in that in the filtration noon, dehydration is carried out without applying negative pressure, and in the subsequent suction noon, dehydration is carried out under slightly low pressure.

(5) The final stage of the compression zone runs in the vertical direction! 1 (1) * (2)
and the device according to any of the above items.

(6) The apparatus according to any one of claims (1) and (2) and each of the above items, characterized in that the nine-pressing belt is spaced apart from the screening belt and moves straight ahead by a certain distance.

(7) A fourth drainage zone is provided behind the squeezing zone, in which shear stress is applied to the sludge mass formed in the squeezing zone. Range (2) K-described Of device.

(8), the preceding item (7), characterized in that the sludge mass is compressed in accordance with the progression of a certain shear stress inside the fourth drainage zone;
The device described in.

(9) The apparatus according to any one of the preceding clauses (7) and (8), wherein the sludge lumps that are transported in a wave-like motion in the transport direction are referred to as 41' mold.

The device according to claim (1) or (2), characterized in that in the oOl-transfer zone, the screening belt is distributed with an inclination of slightly above the center in the direction of travel.

ol, the dispersion knife is arranged at a distance from the X cleaning belt (D
@! i The device according to (1) or (2).

(b) The device as described in the preceding paragraph, characterized in that the dispersion knife is disposed directly against the surface of the screening belt.

(To) The device according to item # above, characterized in that the dispersion knife is inclined in the advancing direction of the screening belt.

α◆, 4Ill characterized in that the roller is arranged at a distance from the screening belt! (f) The apparatus according to claim (1) or (2) K. (b) The injection O apparatus according to the preceding clause (nK), characterized in that (b) and (b) and (b) and (a) are free-sphere transpositions.

(To) The apparatus described in the preceding item α◆, characterized in that the roller can be driven in a direction opposite to the traveling direction of the screening belt.

(b) The device according to the preceding item ◆, characterized in that the roller can be driven in the same direction as the screening belt.

(to) The suction means comprises a suction channel, and the 4-ft) connecting pipe opens into the suction channel from the side above the holding tank. 1)
or (2) the device described in K.

(b) The suction chamber is subdivided into several O-chambers each having a lower pressure that increases in the direction of the screening belt's travel. 1(
1) I (2) or the device described in the preceding paragraph (to).

(e) The suction chamber/4 communicates with the water tank via a pipe line, and the pipe line is immersed in the tank and is thereby formed as a pressure measuring device in the suction chamber. Claim 1 is characterized in that: j (1) I (
2) or the device described in the preceding section (to) k.

2. Device according to claim 1, characterized in that the sag-impermeable surface is the surface area of the drive roller for the screening belt of the squeezing zone.

(2) The apparatus described in the preceding item), wherein the pressing belt presses a screening belt that is conveyed by a drive roller.

11(1), (2) and any of the preceding clauses, characterized in that the squeezing belt can be moved by the screening belt without a self-driving mechanism.

(Incorporated), the pressure in the compression zone can be adjusted freely by changing the tension of the compression belt, Claim O Scope '(1), (2) and any one of 6 of the preceding paragraphs. Device.

(c) Against the screening belt of the pressing belt t61
sl! The apparatus according to any one of claims 1 and 2 and the preceding clause, characterized by a head whose angle is adjustable.

Claims characterized in that a device for freely adjusting the tension or opening angle of the compression belt is formed (
1), ←), the device described in the previous section - t and the previous section @.

(Incorporated), according to claim 11(1), I(2) and any of the preceding paragraphs, characterized in that the residual water squeezed out from the squeezing belt is suctioned by one or several suction devices. The device described.

(c) The pressing belt is separated from the drive roller according to a smaller loop angle than the screening belt.Claim II (1), (2)'
*The device described in any of the preceding paragraphs.

■The compression belt is separated from the screening belt.
The device according to item (to) k above, characterized in that the device is transported over a short distance in a tangential direction.

The preceding item H is characterized in that the ring and loop angle are adjustable.
The device described in.

0I, Claims (1) and (2) characterized in that the final guide roller of the squeezing belt has a significantly smaller diameter than the drive roller of the screening belt.
*Or the device described in any of the preceding paragraphs.

(to) The device according to claim (1) or (2). having the following features.

(a) An endless screening belt is conveyed freely in the transit zone as a C cloth, moves over a suction chamber covered by a support member in the suction zone, and is supported by at least two rollers in the squeezing zone.゛Receives the pressure of the squeezing belt. (Nishiki) Dewatering in the filtration zone is performed without using low pressure. (ab) The filtration zone 0 screening belt is arranged with an upward slope of the core in the direction of travel. me) A device disposed in the filtration zone in a direction transverse to the m-row direction of the screening belt spreads and disperses sewage sludge with an even thickness and width on the screening belt; (ms) said device is arranged at a distance from the screening belt and is free to rotate in the direction of travel of the screening belt or in the opposite direction; (bb) Dewatering of the suction zone is carried out at a slightly lower pressure, (
b@) The suction chamber consists of a closed chamber with a holding tank inclined towards the outlet and a support member arranged above, for sewage sludge to be conveyed by the screening belt via the support member. Side seals are provided, and the suction chamber/bone furthermore has a low pressure device connected to the suction device. The low pressure increases in the direction of movement of the screening belt. (Cbt) The suction channel I9 is opened to the sump through the ino in I (C@) The squeezing noon is placed in the area of the guide roller of the screening belt, (ad) The screening belt of the squeezing zone (C) The impermeable surface is the surface area of the roller that drives the screening belt in the squeezing zone; (ef) The squeezing belt is the screening belt that is transported by the driving roller can be pressed. It is movable by the screening belt without any self-driving mechanism.

(@g) A device configured to freely change the tension of the pressing belt 7 and the opening angle of the screening belt allows the pressure of the pressing noon to be adjusted freely. (@h) The residual snow moisture that is discharged is on the 1st side.
or several suction means, (-〇At the final stage of the squeezing noon, the screening belt running vertically, and the large squeezing belt separated from it, guided in the tangential direction for a short distance, (・J) E-squeezing belt is separated from the drive roller according to a small adjustable loop angle (0 rule l angle); It has an inherently small diameter.

(to) (7) a (8) or (9), characterized in that in the fourth drainage zone, an additional screening belt is guided between the screening belts and at least one end roller; ).

The device according to item (1) above, characterized in that the upper roller and/or the lower roller are movable in the direction above the adjacent rollers across the conveyance direction.

(to) The apparatus according to any one of the preceding clauses and (b), characterized in that at least two of the rollers are movable.

(g) The device according to item (2) above, characterized in that the rollers are mounted so as to press against each other at the ends of each roller lock.

(b) Claim (1) characterized in that the fourth drainage zone is installed below the suction zone.

The device according to any one of (2) and the preceding item) to (to).

(to) Patent claim O range i, characterized in that the integrated receiving tank accommodates large amounts of water removed in all four drainage zones!
1(t)*(2) and the device according to any one of # items (b) to (2).

Zeng, j114 The large moisture removed in the drainage zone is transferred to JIJI, and the moisture removed in the drainage and suction zones flows into the receiving tank via the conduit (2).
The device described in.

11. The device according to the preceding item (to), characterized in that the drain port of the receiving tank is installed at a high position so that a constant water level is maintained in the tank.

Seagull, suction! - The conduit for conveying the water removed in the zone extends into the water of the receiving tank, and the conduit for guiding the water removed in the passing zone leads above the water level O of the receiving tank. The device according to any one of the preceding clauses (2) to -〇.

Claim 8(1) characterized in that the entire device is transportable and is formed as a unit that can be installed in four units, and the receiving water tank is incorporated into the unit. I (2
) and the device described in any of the preceding sections (2) to UO.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the device of the present invention, FIG.
110 device and the device of the present invention having a different configuration O. This is a schematic explanatory diagram of the fist 10...-excess zone, 12... suction! -n, 14・
...Squeezing zone, 16...Sludge, sludge keigo, 18.
...Screening belt, 20...Roller, 22.
... Support member, 24... Opening, 26... Suction channel/f% 28... Low 9.30... Pressing belt,
32...Roller, 34...Applying knife, 36...
Dispersion means, 4G... Outlet, 42... Tank, 52
...opening, s6...sump, 60...(-),
62... Stirring device, 68... Coagulation accelerator, 73...
・Washing device, 74...Paper/4nd, 75...Conveyor belt, 76...Tank, 77...Fresh water utilization device, 79...Drum controller, 80...Tensile filter) , 84... Trap, 88... Vacuum 4nd, 90... Tank, 94... Rod. Daihojin Benho Officer Hiro Iro 1

Claims (1)

[Claims] (!) An endless screen belt that conveys the sludge and treats the water in the sludge, a suction channel that sucks the water that passes through this belt, and a side part of the A sludge dewatering device in which suction that sets the inside of a suction chamber to a predetermined negative pressure state through a communicating suction pipe is continuously conveyed from a transit zone to a squeezing zone via a suction zone. The sludge dewatering device according to claim (1)K, characterized in that a suction chamber is provided.