JPH11216458A - Screen device and separation of natural fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen device enabling to excellently separate natural fiber from human waste or sewerage. SOLUTION: The screen device 1 is provided with a tank 2 for receiving a liquid removed relatively larger foreign matters from the human waste or sewerage, a screen 3 having an opening for dividing this tank 2 into a first room 4 and a second room 5, an agitation member 6 disposed in the first room 4 and stirring the liquid received in the tank 2, a first discharge path 7 communicated with the first room 4, and a second discharge path 8 communicating with the second room 5. The opening part has a 50-70 mesh size and the liquid received into the tank 2 is stirred with the agitation member 6 and a lump of the organic matters contained in the liquid is crushed and passed through the opening part but the natural fiber contained in the liquid is not passed through and retained in the tank, thus the fiber can be separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a screen device and a natural fiber separation method, and more particularly to a screen device and a natural fiber separation method capable of satisfactorily separating natural fibers from human waste or sewage.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Hei 4-31727 discloses a natural fiber that can be separated from human waste or sewage.
There is one described in Japanese Patent Publication No.

The device disclosed in Japanese Patent Publication No. Hei 4-31727 removes stones, gravel and metals in human waste with a sand remover.
Thereafter, non-natural fibers such as vinyl and polyester cotton yarn are removed by an internal pressure backwash type screen device, and thereafter, natural fibers mainly composed of chile paper are removed by a feed screen device.

[0004]

However, there is no specific description of the feed screen device.
The feed screen device is used for density adjustment in a thickener described in Japanese Patent Publication No. 7-502577.
In the above-mentioned Japanese Patent Publication No. 4-31727, it is not possible to separate the lump of organic matter contained in human waste or sewage that has passed through the internal pressure backwash type screen device, and the feed screen device uses a natural fiber mainly composed of chile paper. However, there is a problem in that organic matter remains in the natural fibers and the separation is not good.

[0005] It is an object of the present invention to provide a screen device and a method for separating natural fibers, which eliminate the above-mentioned problems.

[0006]

In order to achieve the above-mentioned object, a screen device according to the present invention comprises a tank for receiving a liquid obtained by removing relatively large foreign matter from human waste or sewage, and this tank is provided with a first chamber and a first chamber. A screen having an opening sectioned into two chambers, a stirring member provided in the first chamber for stirring the liquid received in the tank, and a first discharge communicating with the first chamber. The passage, the second discharge passage communicating with the second chamber, and the opening having a size of 50 to 70 mesh, the liquid received in the tank is stirred by the stirring member, and the liquid is mixed with the liquid. By crushing the lump of organic matter contained and passing through the opening, so that natural fibers contained in the liquid do not pass through the opening,
It can be separated by keeping it in the tank.

Further, in the method for separating natural fibers according to the present invention, a liquid obtained by removing relatively large foreign matter from human waste or sewage is received in a tank, and the liquid received in the tank is agitated to remove organic matter contained in the liquid. Crushed, and the crushed material was passed through a screen having an opening having a size of 50 mesh to 70 mesh, so that natural fibers contained in the liquid were retained in the tank. It separates natural fibers from sewage.

Further, according to the method for separating natural fibers of the present invention, a relatively large foreign substance is removed from human waste or sewage by a first screen having a first opening, and the liquid after removing the foreign substance is placed in a tank. Receiving, stirring the liquid received in this tank, pulverizing the lump of organic matter contained in the liquid, and pulverizing the pulverized material having a size of 50 mesh to 70 mesh smaller than the size of the first opening. Natural fibers are separated from human waste or sewage by passing through a screen having an opening so that natural fibers contained in the liquid remain in the tank.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A screen device and a method for separating natural fibers according to one embodiment of the present invention will be described with reference to the drawings. FIG.
, 1 is a screen device, and the screen device 1
Has a tank 2 for receiving a liquid obtained by removing relatively large foreign matter from human waste or sewage.

The tank 2 is supported by a support member 22 erected on a base 21 and has a screen 3 having an opening.
It is divided into a first chamber 4 and a second chamber 5. The opening of the screen 3 has a size of 50 mesh to 70 mesh, for example, is formed in a mesh shape by crossing the plastic wire 31 (the size of the mesh opening is, for example, 50 mesh to 70 mesh). 2, the front of the plastic wire 31 is supported by a front support member 32, and the back of the plastic wire 31 is supported by a back support member 33, and the shape of the screen 3 is held in a substantially cylindrical shape. It is formed.

Reference numeral 7 denotes a first discharge passage communicating with the first chamber 4. An opening / closing valve for opening and closing the passage of the first discharge passage 7 (not shown) is provided in the middle of the first discharge passage 7. Is provided.

Reference numeral 8 denotes a second discharge passage communicating with the second chamber 5, and reference numeral 9 denotes a supply passage for supplying a liquid obtained by removing relatively large foreign matters from human waste or sewage into the tank 2.

Reference numeral 6 denotes a stirring member which stirs the liquid received in the tank 2. For example, the stirring member 6 is opposed to the inside of the substantially cylindrical screen 3 and protrudes stepwise on the outer periphery of the substantially cylindrical shape. 61 are provided. Reference numeral 62 denotes a motor supported by a support member (not shown) erected on the base 21. The rotation of the motor 62 is transmitted to a rotating shaft 64 via a belt 63, and the stirring member 6
Is designed to rotate. 65 is a bearing for the rotating shaft 64,
The bearing 65 is supported by a support member 66 erected on the base 21.

Next, a case where the screen device 1 is applied to a system for processing human waste will be described with reference to FIG.

Reference numeral 10 denotes a transport vehicle for transporting human waste, and the human waste transported by the transport vehicle 10 is received in an input tank 11. Input tank
The human waste in 11 is supplied to a first screen device 12 by a crushing pump 13.
Is supplied by a supply pipe 14 having The first screen device 12 includes a first screen having a first opening (not shown) and, preferably, a stirring member (not shown). The size of the first opening is larger than the opening of the screen 3 of the screen device 1 described above. The diameter of the first opening is 1 mm to 5 mm for a round hole, and the width of 0.1 mm for a slit.
~ 0.4mm Length is about 50mm.

Accordingly, relatively large foreign matters can be removed from the human waste (or sewage) supplied through the supply pipe 14 by the first screen device 12. Foreign matter is guided to the first belt conveyor 15, and human waste that has passed through the first screen (not shown) of the first screen device 12 is guided to the storage tank 16.

The human waste in the storage tank 16 is supplied to the above-mentioned screen device 1 by a supply pipe 18 having a pump 17.
In the screen device 1, when the human waste (liquid) received in the tank 2 is stirred by the stirring member 6, the lump of organic matter contained in the human waste (liquid) that has passed through the first screen device 12 is pulverized, and The crushed material passes through the opening of the screen 3 and is guided to the explosive tank 40 via the supply pipe 19.

On the other hand, natural fibers contained in the human waste (liquid) in the tank 2 of the screen device 1 (see FIG. 1) cannot pass through the opening of the screen 3 and the first discharge passage 7 has a passage. , Which is closed by an open / close valve (not shown)
It will stay in the tank 2. Then, the first discharge passage 7
By opening an opening / closing valve (not shown) provided in the middle, the human waste (liquid) containing a large amount of natural fibers is guided to the drum screen 42 through the discharge pipe 41. The drainage of the drum screen 42 is guided to the detonation tank 40 via the discharge pipe 44.

Human waste (liquid) guided to the drum screen 42
In the drum screen 42, for example, human waste (liquid) containing 1% concentration of natural fiber is concentrated into human waste (liquid) containing about 3% concentration. Manure (liquid) containing natural fibers at a concentration of about 3% is guided to the screw press 43. Drainage from the screw press 43 is guided to the explosive tank 40 via a discharge pipe 45. In the explosive tank 40, the air compressor 46
From the air supply pipe 47 to the air supply pipe 47
Water is supplied to the wastewater within 40.

The natural fibers compressed by the screw press 43 are conveyed to the belt conveyor 15 via the belt conveyor 50 and the belt conveyor 51. The natural fibers conveyed to the belt conveyor 15 and the foreign matter separated by the first screen device 12 are guided to a screw press 52 and compressed. After being compressed, it is guided to an incinerator 54 through a passage 53 and incinerated in the incinerator 54.

The human waste (liquid) in the explosive tank 40 is decomposed by bacteria and the like, and is supplied to a stirring tank 57 by a supply pipe 56 via a pump 55. In the stirring tank 57, the human waste (liquid) is stirred by receiving the supply of the coagulant from the coagulant tank 58, and after stirring, water is further removed by the belt press 59 to be processed into the dewatered cake 60.

In the embodiment shown in FIG. 3, a first screen device 12 is arranged upstream of the screen device 1. If the first screen device 12 is, for example, a slit-type screen (strainer), the slit-type screen (strainer) has a high complementarity for capturing solid and granular foreign matters, and thus the sent urine is discharged. The large solid or granular foreign matter in the inside can be captured and removed, but the paper fibers in the human waste sent easily pass through a slit-type screen (strainer) in shape. Therefore, the acceptance of the first screen device 12 in the first stage includes a large amount of paper fibers and organic substances.

For this reason, the screen device 1 is arranged downstream of the first screen device 12.

That is, in the screen device 1, the liquid from which relatively large foreign matter has been removed from the human waste is stirred by the stirring member 6, and the lump of organic substances contained in the liquid is pulverized to reduce the pulverized substance to 50 to 70 mesh. The natural fibers can be satisfactorily separated from the human waste by allowing the natural fibers contained in the liquid to pass through the openings through the mesh-sized openings and not passing through the openings.

Then, the high-speed rotation of the stirring member 6 (for example,
20 m / s) to prevent clogging of the slit type screen (strainer) due to cavitation caused by the cavitation, and to crush lumps of organic substances other than fibers by crushing force due to cavitation.
It is made to pass through an opening having a size of mesh to 70 mesh.

The natural fibers compressed by the screw press 43 were incinerated in the incinerator 54. In some cases, the natural fibers compressed by the screw press 43 were guided to a coagulant tank 58, and used as a substitute for the coagulant. Alternatively, natural fibers compressed by the screw press 43 may be used as a raw material for re-papermaking.

In the present embodiment, an example in which the present invention is applied to a system for treating human waste conveyed by the transport vehicle 10 has been described. However, the present invention is not limited to this, and is similarly applied to a system for treating sewage. You can do it.

[0028]

According to the first aspect of the present invention, the liquid obtained by removing relatively large foreign matter from human waste or sewage is stirred by the stirring member, and the lump of organic substances contained in the liquid is pulverized to 50 mesh. Natural fibers can be satisfactorily separated from human waste or sewage by passing through an opening having a size of about 70 to 70 mesh and preventing natural fibers contained in the liquid from passing through the opening.

According to the natural fiber separation method of the present invention, the liquid from which relatively large foreign matters have been removed from human waste or sewage is stirred by the stirring member, and the lump of organic substances contained in the liquid is pulverized to 50 mesh. Natural fibers can be satisfactorily separated from human waste or sewage by passing through an opening having a size of about 70 to 70 mesh and preventing natural fibers contained in the liquid from passing through the opening.

According to the natural fiber separation method of the present invention, the liquid from which relatively large foreign matter has been removed from human waste or sewage is stirred by the stirring member, and the lump of the organic matter contained in the liquid is pulverized to 50 mesh. Natural fibers can be satisfactorily separated from human waste or sewage by passing through an opening having a size of about 70 to 70 mesh and preventing natural fibers contained in the liquid from passing through the opening.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a screen device according to one embodiment of the present invention.

FIG. 2 is a schematic partially enlarged sectional view of the screen device of FIG. 1;

FIG. 3 is a schematic explanatory view when the screen device of FIG. 1 is applied to human waste processing.

[Explanation of symbols]

 Reference Signs List 1 screen device 2 tank 3 screen 6 stirring member

Claims (3)

[Claims] 1. A tank for receiving a liquid obtained by removing relatively large foreign matter from human waste or sewage, a screen having an opening for dividing the tank into a first chamber and a second chamber, and the first chamber A stirring member provided in the tank and for stirring the liquid received in the tank; a first discharge passage communicating with the first chamber; a second discharge passage communicating with the second chamber; The opening has a size of 50 mesh to 70 mesh, the liquid received in the tank is stirred by the stirring member, and a lump of organic matter contained in the liquid is crushed and passed through the opening, A screen device wherein natural fibers contained in a liquid can be separated so as not to pass through the opening, but to be retained in the tank. 2. A liquid in which relatively large foreign substances have been removed from human waste or sewage is received in a tank, and the liquid received in the tank is stirred, and a lump of organic matter contained in the liquid is pulverized. Is passed through a screen having an opening having a size of 50 mesh to 70 mesh, and the natural fibers contained in the liquid are retained in the tank to separate the natural fibers from human waste or sewage. Characteristic method for separating natural fibers. 3. A relatively large foreign substance is removed from human waste or sewage by a first screen having a first opening, and the liquid after removing the foreign substance is received in a tank, and the liquid received in the tank is removed. Is stirred to pulverize the lump of organic matter contained in the liquid, and the pulverized substance is passed through a screen having openings of 50 mesh to 70 mesh smaller than the size of the first opening. A method of separating natural fibers from human waste or sewage by keeping natural fibers contained in the liquid in the tank.