JP2001327811A - Device for treating scum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform solid-liquid separation of the scum discharged from a settling pond and a final settling pond of a sewage treatment plant without causing the clogging of a drum screen. SOLUTION: This scum treating device has the drum screen which is horizontally hung to be freely rotatable and into which the scum is supplied and separated into solid and liquid. The drum screen is formed by using a plurality of long-length base materials so that they are arranged at the prescribed intervals in the same direction as the axial direction of the drum screen to form a screen mesh and an entanglement preventing wall projecting toward the outside direction of the drum screen is disposed on each of the base materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scum processing apparatus capable of efficiently performing solid-liquid separation processing without causing clogging of scum discharged from a water treatment facility such as a first sedimentation site or a final sedimentation basin of a sewage treatment plant. About.

[0002]

2. Description of the Related Art Conventionally, the first sedimentation basin of a sewage treatment plant (first sedimentation)
The scum generated from the final sedimentation basin (final sedimentation) contains a large amount of water, and is subjected to solid-liquid separation processing by a scum processing device in order to increase the efficiency of the subsequent incineration treatment and landfill disposal.

[0003] As a scum processing apparatus for solid-liquid separation of scum, a drum screen type scum processing apparatus according to the present applicant is known. This drum screen type scum processing device is configured by providing a rotatable and horizontally rotatable drum screen in a closed cover. This drum screen is constituted by a drum screen having openings that do not allow scum to pass through.

In order to process scum generated from the first sedimentation basin or the last sedimentation basin of the sewage treatment plant by the scum treatment apparatus having the above-described structure, scum is supplied into a drum screen rotating in one direction. Then, the moisture contained in the scum passes through the drum screen, is received in the cover, and is first returned to the raw water side of the sedimentation basin. Also,
The scum remaining on the inside of the drum screen is
After being discharged from one end of the drum screen to the outside of the cover, a predetermined process such as an incineration process is performed.

[0005]

However, the above-mentioned conventional scum processing apparatus has a disadvantage that the drum screen is easily clogged. In order to eliminate such drawbacks, a nozzle is provided for spraying washing water onto the drum screen from the inside and outside of the drum screen. However, when long narrow objects such as hair are caught in the openings of the drum screen, the washing is performed. Removal by water was difficult and required manual removal on a regular basis. In addition, in order to firmly remove contaminants entangled with the openings of the drum screen, it has to be burned with a burner and removed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a scum processing apparatus having a drum screen which is hardly clogged.

[0007]

In order to achieve the above object, a scum processing apparatus according to the present invention provides a scum processing apparatus for supplying scum into a rotatably mounted drum screen and separating solid and liquid. , The drum screen
A number of long base materials are formed in the same direction as the axial direction of the drum screen, and are arranged at predetermined intervals so as to form predetermined openings. The present invention is characterized in that entanglement preventing walls projecting outward from the drum screen are provided. Also,
The base is made of a wedge wire. The drum screen is provided with a nozzle for injecting washing water.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a scum processing apparatus according to one embodiment, and FIG. 2 is a part of an enlarged sectional view taken along line AA of FIG. In FIG. 2, hatching indicating a cross section is omitted in order to prevent the drawing from being complicated (the same applies to FIG. 3 described later).

In FIG. 1, reference numeral 1 denotes a gantry, on which a cover 2 for covering the whole of a drum screen 10 to be described later in a sealed manner is provided. At the bottom of the cover 2, there are provided a drain port 3 for discharging the separated water separated by the drum screen 10 and a discharge port 4 for discharging the scum (small material) separated by the drum screen 10. . The cover 2 is provided with a duct for sucking and removing the odor in the cover 2, but is omitted here.

In FIG. 1, M denotes a motor having a speed reduction mechanism, and a rotation drive shaft 11 of a drum screen 10 is connected to a rotation shaft M 'of the motor M extending in the horizontal direction. The rotation drive shaft 11 is supported by a bearing 1 a provided on the gantry 1.

The drum screen 10 is supported by the above-mentioned rotary drive shaft 11 in a cantilever manner, and is rotatably suspended. That is, one end side (the left end side in FIG. 1) of the drum screen 10 is closed by the end plate 12, and the above-described rotary drive shaft 11 is attached to a center portion of the end plate 12. Although the horizontal state of the drum screen 10 is omitted in the drawing, it is slightly inclined so that the above-described one end is higher and the other end (the side opposite to the rotary drive shaft 11) is lower. It is provided. The other end of the drum screen 10 is formed in an open opening 13 through which a scum supply gutter 14 supported by a support member (not shown) and a washing water supply pipe are provided. 15 is the drum screen 1
0.

The scum supply gutter 14 is connected to the drum screen 1.
The cleaning water supply pipe 15 is provided inside the drum screen 10 through a nozzle (not shown) provided in the cleaning water supply pipe 15 so that scum can be supplied substantially uniformly inside the drum screen 10. Is provided so as to be able to jet uniformly.

In FIG. 1, reference numeral 16 denotes a washing water supply pipe provided outside the drum screen 10, and a nozzle (not shown) provided on the washing water supply pipe 16 outside the drum screen 10. It is configured so that the washing water can be jetted uniformly.

As shown in FIG. 2, the drum screen 10 is a long base material 2 made of a large number of wedge wires.
Are provided in the same direction as the axial direction of the drum screen and at a predetermined interval so as to form a predetermined opening, facing the end plate 12 and the end plate 12. The outer peripheral edge of the end plate 12 and the ring member 12a having the same shape are arranged and formed. Then, the base materials 20 and 2
.. Are provided with anti-jam walls 21, 21... Protruding a predetermined length outward of the drum screen 10, respectively, to form the screen members 30. The anti-entanglement wall 21 of the screen material 30 can be provided by welding to the base material 20 and can also be formed by integrally forming the base material 20 and the anti-entry wall 21 (see FIG. 3 described later). ).

The above-mentioned aperture, that is, the distance D between the substrates 20, is 2 to 5 mm when the scum is discharged from the first sedimentation basin or the last sedimentation basin of the sewage treatment plant. If it is smaller than this, it is not preferable because a large amount of water is contained in the separated scum. On the other hand, if it is larger than this, the proportion of scum (small material) mixed in the separated water is not preferable. The length L of the screen material 30 including the anti-entanglement wall 21 and the base material 20 is preferably 25 mm to 150 mm. If the length L of the screen material 30 is less than 25 mm, the effect of preventing long narrow objects from sticking to the screen material 30 is undesirably reduced. If the length L of the screen material 30 exceeds 150 mm, the outer diameter of the drum screen 10 increases, and the diameter of the cover 2 increases, so that not only the driving energy but also the overall size of the apparatus increases. Is not preferred.

In order to process the scum generated from the first sedimentation basin and the last sedimentation basin of the sewage treatment plant by the scum treatment apparatus having the above structure, the drum screen 10 is rotated in one predetermined direction via the motor M ( When the scum is supplied from the scum supply gutter 14 into the drum screen 10, the moisture contained in the scum passes through the drum screen 10 and is collected at the bottom of the cover 2. It is discharged from 3. The separated water discharged from the drain port 3 is returned to the first settling basin (not shown) for processing.

The scum (small material) remaining inside the drum screen 10 moves to the opening 13 side of the drum screen 10 as the drum screen 10 rotates, and is discharged from the opening 13 to the discharge port 4. You. The scum (small material) discharged to the discharge port 4 is disposed of by incineration or landfill.

The cleaning water is supplied from the cleaning water supply pipes 15 and 16 during the above-mentioned scum processing or intermittently.
By the supply of the washing water, the complicated matter remaining in the openings is washed off, and clogging can be effectively prevented. In addition, since the contaminants remaining in the openings do not stick to the base material 20 due to the action of the anti-entanglement wall 21, there is a feature that the impurities can be easily washed away by spraying the washing water.

FIG. 3 shows that the screen member 30 shown in FIG. 2 is composed of a long base material 20 and an anti-entanglement wall 21. In this case, however, a long base material 20 'and an anti-entanglement wall 21' are used.
Are integrated to form a drum screen 10 '. Therefore, in the present invention, the case where the anti-entanglement wall is provided on the base material includes the case where the base material 20 'and the anti-entanglement wall 21' are integrated as described above. In this example, also,
Even when the above-described wedge wire is used, the plane forming the inside of the drum screens 10 and 10 'can move the scum (small objects) in the drum screens 10 and 10' more favorably when it is flat. .

[0020]

According to the scum processing apparatus of the present invention,
The drum screen is formed by arranging a number of long base materials in the same direction as the axial direction of the drum screen and at predetermined intervals so as to form predetermined openings. Since the material is provided with anti-entanglement walls protruding outwardly of the drum screen, scum can be efficiently separated into solid and liquid while preventing clogging. When the base material is a wedge wire, the inner surface of the drum screen can be formed flat. And when the nozzle which sprays washing water is provided in a drum screen, a drum screen can be wash | cleaned easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scum processing apparatus according to an embodiment of the present invention.

FIG. 2 is a part of an enlarged sectional view taken along line AA of FIG. 1;

FIG. 3 is another example of a drum screen.

[Description of Signs] 1 base 2 cover 10, 10 'drum screen 11 rotation drive shaft 15, 16 washing water supply pipe 20, 20' base material 21, 21 '

Claims (3)

[Claims] 1. A scum processing apparatus for supplying scum into a rotatably suspended drum screen for solid-liquid separation, wherein the drum screen comprises a plurality of long base materials in an axial direction of the drum screen. In the same direction as above, and at predetermined intervals so as to form a predetermined aperture, the base material is provided with anti-winding walls protruding outwardly of the drum screen. A scum processing device. 2. The scum processing apparatus according to claim 1, wherein the base is made of a wedge wire. 3. The scum processing apparatus according to claim 1, wherein a nozzle for jetting cleaning water is provided on the drum screen.