JP2004160321A - Screw type filtering dehydrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw type filtering dehydrator having an effective filtered water treatment function for eradicating defects of a preceding technique to properly separate filtered water flowing out of a filtered water outflow groove. <P>SOLUTION: A cylindrical filter member 1 is horizontally provided above a storage tank 16 and the start end opening part thereof is set as a sewage raw water send-in port 8 while the terminal opening port thereof is set as a dehydrated cake send-out port 9 and a screw conveyor 11 is fitted and mounted in the center hole 10 of the cylindrical filter member 1. A drain passage 14 is opened in the rear part of the storage tank 16 and a receiving trough 15, which reaches the drain passage 14 provided to the storage tank 16 from the front end in the storage tank 16, is provided just under the filter member 1. The receiving trough 15 is bent in a downward inclined state from the central part thereof to both end directions thereof so as to be tiltable before and behind. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention, for example, a suspension containing suspended fine particles generated in a relatively small-scale sewage treatment work represented by the oxidation ditch method and the like, by a low concentration state without passing through the concentration step, the suspension with the filtrate The present invention relates to a screw-type filtration dewatering apparatus for separating fine particles into fine particles.
[0002]
[Prior art and its problems]
A large number of annular filtration plates are fixed in a stacked state while maintaining a required interval, and an annular movable plate is loosely fitted between the respective stacked layers of the annular filtration plates to form a gap between the respective plates with a drainage outflow groove. A cylindrical filter body is formed, and the filter body is laid horizontally above the storage tank, and a screw conveyor is provided in the center hole with its start opening as the feed port for sludge raw water and the end opening as the outlet for the dehydrated cake. 2. Description of the Related Art A screw-type filtration and dewatering device fitted with a screw is known (for example, see Patent Document 1). The sludge raw water sent in from the inlet is separated while moving in the filter body by driving the screw conveyor, and the filtered water flowing down from the drain outlet and the dewatered cake sent out from the outlet are separately processed. It is generally done. In this type of filtration and dewatering device, the squeezing effect generally increases from the middle part to the end part of the filter body, so that unlike the drainage that flows down from the drainage outlet near the start end, the filtration near the end where the water content is reduced. The suspended fine particles flow out from the water outflow groove. In order not to mix the filtered water in the initial stage and the suspended particulates from near the terminal end in the filter body, the filtered water in the initial stage is drained directly from the drain port, and the subsequent filtered water is stored in the storage tank, There is also a proposal that after separating the supernatant water and the settled sludge according to the specific gravity difference, the supernatant water is drained from the drainage port, and the settled sludge is pulled out of the tank from the drainage port in a timely manner (FIG. 1 of Japanese Patent Application No. 2002-188992). And FIG. 2).
[0003]
[Patent Document 1]
JP 2001-25618 (FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
In the filtration dehydrator of Patent Document 1, it is inevitable that a large amount of suspended fine particles are mixed in the drainage discharged from the filtrate discharge pipe. Therefore, such drainage cannot be discharged to a river or the like as it is. Further, the filtration and dewatering device of Japanese Patent Application No. 2002-188992 is inefficient because it takes time to settle the filtrate in the storage tank.
[0005]
An object of the present invention is to provide a screw-type filtration and dewatering apparatus that eliminates the above-mentioned disadvantages of the prior art, performs proper separation of drainage flowing out from a drainage outlet, and has an effective drainage treatment function. And
[0006]
Configuration of the Invention
In the screw type filtration dewatering apparatus according to the present invention, a large number of annular filtration plates are fixed in a stacked state while maintaining a required interval, and each annular movable plate is loosely fitted between the respective stacked layers of the annular filtration plates. A cylindrical filter body is formed with the slit between the plates as a drainage drainage groove. The filter body is laid horizontally above the storage tank, the starting end opening of which is a feed port for sludge raw water, and the end opening of which is dewatered. A screw conveyor is fitted into the center hole as a cake outlet, and a drainage channel is opened in the rear part of the storage tank, and a gutter reaching from the front end in the storage tank to the rear part of the drainage path immediately below the filter. The trough is bent downward from the center toward both ends and is configured to be tiltable back and forth.
[0007]
[Action]
When the rear part of the gutter is inclined downward to the drainage channel side and the front part is held almost horizontally, the drainage water flowing out from the drainage outlet groove is guided to the drainage channel along the inclination of the rear part of the gutter, and the gutter is received. If suspended troughs are tilted forward as suspended particulates accumulate in the front part of the vessel, the suspended particulates fall into the storage tank and the trough is washed by the flow-down action of the filtrate.
[0008]
【Example】
This will be described with reference to the following embodiments shown in FIGS.
[0009]
Reference numeral 1 denotes a cylindrical filter, which fixes a large number of annular filtration plates 2... 2 in a laminated state while maintaining a required interval, and is annularly movable between the laminated layers of the annular filtration plates 2. The plates 3 are loosely fitted to form gaps between the plates in the drainage outflow grooves 4. On the outer periphery of each annular filtration plate 2,..., For example, there are seats 5,... Formed with a larger diameter than the outer diameter of each annular movable plate 3,. The spacing between the respective annular filtration plates 2... 2 is regulated by the holders 6... To be slightly larger than the thickness of the respective annular movable plates 3. 7, 7 are fixed bodies that support the respective seat portions 5,..., And are installed along the outside of the filter body 1 so as to be in a non-contact state with the respective annular movable plates 3,.
[0010]
The filter body 1 configured as described above is provided laterally above the storage tank 16, the opening at the start end thereof becomes the feed port 8 for the raw sludge water, and the end opening 9 becomes the discharge port 9 for the dehydrated cake. Is fitted with the screw conveyor 11. Reference numeral 12 denotes a prime mover for driving the screw conveyor 11, and reference numeral 13 denotes a discharge pressure adjusting valve attached to the delivery port 9. As an example, as shown in the drawing of the practical example, the screw conveyor 11 is formed such that the outer diameter of the screw blade 11B is smaller than the inner diameter of the annular filtration plate 2 and larger than the inner diameter of the annular movable plate 3, and is driven by the prime mover 12. The suspended movable particles are transferred, and the outer edge of the screw blade 11B is slid obliquely to the inner peripheral portion of the annular movable plate 3 to rotate the annular movable plate 3 eccentrically. Prevents clogging of drainage drain grooves 4. As another embodiment for eccentrically rotating the annular movable plates 3,..., The outer diameter of the screw blade 11B is formed to be slightly smaller than the inner diameters of the annular filtration plates 2,. The eccentric rotary shaft (not shown) disposed outside the filter body 1 performs eccentric rotary motion in conjunction with the driving of the screw conveyor 11, and slides on the outer periphery of the annular movable plates 3. A system in which the annular movable plates 3 are eccentrically rotated may be used.
[0011]
14 is a drainage channel opened in the rear part of the storage tank 16, 15 is a gutter provided immediately below the filter 1 from the front end of the storage tank 16 to the drainage path 14 in the rear part, It is bent from the center toward both ends in a slanted shape and forms a U-shape on the side, and can be tilted back and forth with the horizontal axis 21 as a fulcrum by operating the push / pull mechanism 20. Reference numeral 18 denotes a drain port led out from the drain channel 14, but may be configured so as to be able to be closed as needed. Reference numeral 19 denotes a mud outlet led out of the bottom plate 17 of the storage tank 16 in a normally closed state, and has a configuration in which articles can be opened as needed when necessary.
[0012]
By operating the push / pull mechanism 20, the rear part 15A of the gutter 15 is inclined downward to the drainage channel 14 side and the front part 15B is held substantially horizontally, and when the prime mover 12 is driven, the screw conveyor 11 rotates, The annular movable plates 3 perform an eccentric rotational movement along the gap between the annular filtration plates 2, and the sludge raw water fed into the filter 1 from the inlet 8 rotates along the screw blade 11B. In the process of moving forward in the axial direction, the filtered water flows out of the drainage outflow grooves 4 and falls down onto the receiving gutter 15 and is guided to the drainage channel 14 along the inclination of the rear portion 15A, The water is sequentially sent out from the drain 18. On the other hand, the dewatered cake having a reduced water content due to dehydration in the filter body 1 is sequentially discharged from the front delivery port 9, and if suspended particulates accumulate on the trough front part 15B during that time, a push-pull mechanism is provided. By the operation of 20, the front part 15B of the trough 15 is tilted downward and the rear part 15A is tilted upward, so that the suspended fine particles fall into the storage tank 16 and the trough is drained using the flow-down action of the drainage water. 15 Wash on top. Further, the settled sludge in the storage tank 16 is pulled out from the discharge port 19 at an appropriate time and discharged outside the apparatus.
[0013]
【The invention's effect】
In the present invention, the disadvantages of the prior art are wiped out, and the drainage water obtained by the filter body 1 is further guided into the drainage channel 14 with the suspended fine particles removed on the receiving gutter 15 and is guided through the drainage port 18. Since it is discharged, it can be discharged directly to rivers and the like. Further, there is an advantage that a quick and continuous drainage separation operation can be effectively performed without requiring a precipitation step, and the receiving trough 15 is automatically cleaned.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view schematically showing the configuration of the device of the present invention.
FIG. 2 is a vertical sectional side view of a main part of a filter in the apparatus of the present invention.
FIG. 3 is a vertical sectional front view of a filter in the apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical filtration body 2 Annular filtration plate 3 Annular movable plate 4 Filtration outflow groove 8 Sludge raw water inlet 9 Dewatering cake outlet 10 Filtration center hole 11 Screw conveyor 14 Storage tank 15 Receiving gutter 16 Storage tank

Claims (1)

A large number of annular filtration plates are fixed in a stacked state while maintaining a required interval, and an annular movable plate is loosely fitted between the respective stacked layers of the annular filtration plates to form a gap between each plate with a drainage outflow groove. A cylindrical filter body is formed, and the filter body is laid horizontally above the storage tank, and a screw conveyor is provided in the center hole with its start opening as the feed port for sludge raw water and the end opening as the outlet for the dehydrated cake. The drainage channel is opened at the rear part in the storage tank, and a gutter is provided immediately below the filter from the front end in the storage tank to the drainage part at the rear part. A screw-type filtration dewatering apparatus characterized in that it is bent downward in a direction and is configured to be tiltable back and forth.

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