JPH10249337A - Scum removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the range capable of being covered with one scum skimmer. SOLUTION: Scum is sucked from a scum skimmer 5 along with water, and discharged through a suction pump 4, a rotary air-lift pipe 1, a fixed air-lift pipe 2 and a scum transfer pipe 6. When the scum removing device is intermittently operated for a short time to suppress the lowering of the water purifying efficiency, the rotary air-lift pipe 1 is alternately rotated back and forth by the motor 12 provided with a reduction gear. Consequently, the scum suction pipe 4 and skimmer 5 directly connected to the rotary air-lift pipe 1 are alternately rotated back and forth to cover almost the entire surface of a storage tank C. Accordingly, the range where the scum is not sucked in is not practically left in the large storage tank even with a small number of scum skimmers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scum (scum) removing device, and more particularly, to a scum removing device, which floats near a water surface of a storage tank for storing industrial wastewater, sewage, settlement wastewater and the like discharged from factories and canteens. The present invention relates to a scum removal device that sucks and discards scum (those in which fats and oils, microorganisms, etc. float in the vicinity of the water surface in a lump or film form).

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a conventional scum removing apparatus. The scum removing device includes an air lift pipe 51 installed in a storage tank C, an air pipe 53 for blowing compressed air into the air lift pipe 51 to generate air bubbles rising in the air lift pipe 51, A scum suction pipe 54 having a lower end connected to the bottom of the pipe 51; a scum skimmer 55 set at the upper end of the scum suction pipe 54;
And a scum transfer tube 56 connected to the head.

The upper part of the air lift pipe 51 is above the water surface, but most of the air lift pipe 51, the air pipe 53, the scum suction pipe 54, and the scum skimmer 55
Is in the water in the storage tank C. The water surface is determined by the height of the overflow weir D, and the scum skimmer 55 is slightly below the water surface.
Is located.

[0004] The air lift pipe 51 is moved from the air pipe 53 to the air lift pipe 51.
When compressed air is blown into the bottom of the
1 rises out of the scum transfer tube 56. The upward flow of the bubbles acts as a so-called bubble pump (or air lift pump), and water is sucked from the scum skimmer 55 and discharged through the scum suction pipe 54, the air lift pipe 51, and the scum transfer pipe 56.

Sewage (industrial wastewater, sewage, settlement wastewater, etc.)
Flows into the storage tank C from the inflow pipe A and the center tube B, and accumulates in the storage tank C. Then, the sludge in the sewage settles to the bottom of the storage tank C, and the supernatant water on the water surface flows into the overflow weir D, and scum floats near the water surface in a region surrounded by the overflow weir D. The settled sludge is discharged from the bottom of the storage tank C. Also,
The supernatant water that has flowed into the overflow weir D is sent through an outflow pipe E to a subsequent processing step (such as a filtration process or a sterilization process). Further, the scum is combined with water with a scum skimmer 5.
Scum suction pipe 54, air lift pipe 5
1 and discharged through the scum transfer tube 56. In addition,
The scum around the scum skimmer 55 decreases as the scum is discharged (starts the operation of the bubble pump), so that the ratio of water discharged from the scum removing device increases. For this reason, the amount of the supernatant water sent to the subsequent processing step decreases, and the water purification efficiency = (the amount of the supernatant water sent to the subsequent processing step) / (the amount of the inflowing sewage) decreases. Therefore, the scum removing device is intermittently operated for a short time in order to suppress a decrease in water purification efficiency.

[0006]

As described above, since the scum removing device is operated intermittently for a short period of time, the ability to suck scum is not high, and the range in which scum can be sucked is at most from the scum skimmer 55. It is within 5m. However, in the conventional scum removing device, for example, 4.5
For example, since only two scum skimmers 55 are fixedly installed in a large storage tank C of mx 4.5 m, there is a problem that a large area where scum cannot be sucked remains. Therefore, an object of the present invention is to provide a scum removing device that can cover a wide range of a storage tank and hardly leaves a range where scum cannot be sucked.

[0007]

According to a first aspect of the present invention, there is provided a scum skimmer and a scum removing device for sucking scum floating near a water surface in a storage tank into a scum skimmer and a scum suction pipe and discarding the scum. A scum removing device having a movable structure, wherein the scum skimmer is moved in a predetermined horizontal range in the storage tank by an electric motor. In the scum remover according to the first aspect, the scum skimmer is moved within a predetermined range of the water surface in the storage tank by the electric motor, so that the range that can be covered by one scum skimmer can be expanded. Therefore, it is possible to cover a wide range of the storage tank with a small number of scum skimmers, and to hardly leave a range where scum cannot be sucked.

In a second aspect, the present invention relates to an air lift pipe installed in a storage tank, an air pipe for blowing air into the air lift pipe to generate air bubbles rising in the air lift pipe, and the air lift pipe. A scum suction pipe having a lower end connected to the bottom of the scum suction pipe, and a scum skimmer set at the upper end of the scum suction pipe, wherein the scum suction pipe and the scum skimmer are horizontally moved around the air lift pipe. Provided is a scum removal device characterized by being rotatable. In the scum removal device according to the second aspect, the scum skimmer can be rotated horizontally by mechanical drive or manually, so that the range that can be covered by one scum skimmer can be expanded. Therefore, it is possible to cover a wide range of the storage tank with a small number of scum skimmers, and to hardly leave a range where scum cannot be sucked.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this. 1 and 2 show a scum removing device according to an embodiment of the present invention. The scum removing device includes a rotary air lift pipe 1 and a fixed air lift pipe 2 installed at the center of a center tube B in a storage tank C, and an air pipe 3 set coaxially in the air lift pipes 1 and 2.
A scum suction pipe 4 having a lower end connected to the bottom of the rotary air lift pipe 1, a scum skimmer 5 set at an upper end of the scum suction pipe 4, and a scum transfer pipe 6 connected to the fixed air lift pipe 2; An exhaust pipe 7 for exhausting a part of the compressed air blown from the air pipe 3; a rotary joint 8 for rotatably connecting the rotary air lift pipe 1 to the fixed air lift pipe 2; A bearing 9 rotatably supported, a stage 10 supporting the bearing 9 on a storage tank C, a gear 11 fixed to the rotating airlift pipe 1, and the gear 11 are alternately rotated in reverse to rotate the gear. An electric motor 12 with a speed reducer for alternately reversing and rotating the air lift tube 1 is provided.

Although the upper part of the rotary air lift pipe 1 and the upper part of the air pipe 3 protrude above the water surface, the rotary lift pipe 1
, The lower part of the air pipe 3, the scum suction pipe 4, and the scum skimmer 5 are in the water in the storage tank C. The water surface is determined by the height of the overflow weir D, and the scum skimmer 5 is located slightly below the water surface.

When compressed air is blown into the bottom of the rotary air lift pipe 1 from the air outlet 3a of the air pipe 3, air bubbles rise in the rotary air lift pipe 1 and the fixed air lift pipe 2, and the scum transfer pipe 6 and the exhaust pipe Get out of 7.
The upward flow of the bubbles acts as a so-called bubble pump (or air lift pump), and water is sucked from the scum skimmer 5 and passes through the scum suction pipe 4, the rotary air lift pipe 1, the fixed air lift pipe 2, and the scum transfer pipe 6. Is discharged.

Sewage (industrial wastewater, sewage, settlement wastewater, etc.)
Flows into the storage tank C from the inflow pipe A and the center tube B, and accumulates in the storage tank C. Then, the sludge in the sewage settles to the bottom of the storage tank C, and the supernatant water on the water surface flows into the overflow weir D, and scum floats near the water surface in a region surrounded by the overflow weir D. The settled sludge is discharged from the bottom of the storage tank C. Also,
The supernatant water that has flowed into the overflow weir D is sent through an outflow pipe E to a subsequent processing step (such as a filtration process or a sterilization process). Further, the scum is combined with water with a scum skimmer 5.
And is discharged through the scum suction pipe 4, the rotating air lift pipe 1, the fixed air lift pipe 2 and the scum transfer pipe 6. The scum removing device is operated intermittently for a short time in order to suppress a decrease in water purification efficiency. At that time, the rotating airlift pipe 1 is alternately rotated by the motor 12 with the speed reducer. Therefore, the scum suction pipe 4 and the scum skimmer 5 connected to the rotary air lift pipe 1
As shown by an arrow α, the rotation is alternately reversed to cover almost the entire surface of the storage tank C. Therefore, it is possible to hardly leave a range where scum cannot be sucked. The fixed air lift pipe 2 is not rotated because it is connected to the rotary air lift pipe 1 by the rotary joint 8.

[0013]

According to the scum remover of the present invention, the range that can be covered by one scum skimmer can be expanded. Therefore, even in a large storage tank, it is possible to hardly leave a range where scum cannot be sucked.

[Brief description of the drawings]

FIG. 1 is a plan view showing a scum removing device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line X-X 'of FIG.

FIG. 3 is a plan view showing an example of a conventional scum removing device.

FIG. 4 is a sectional view taken along line X-X ′ of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating air lift pipe 2 Fixed air lift pipe 3 Air pipe 4 Scum suction pipe 5 Scum skimmer 6 Scum transfer pipe 8 Rotary joint 9 Bearing 10 Stage 11 Gear 12 Motor with reduction gear

Claims (2)

[Claims] 1. A scum remover for sucking scum floating near the water surface in a storage tank into a scum skimmer and a scum suction pipe and discarding the scum skimmer, wherein the scum skimmer is movable, and the scum skimmer is stored by an electric motor. A scum removing device, wherein the scum is removed within a predetermined horizontal range in a tank. 2. An air lift pipe installed in a storage tank,
An air pipe for blowing air into the air lift pipe to generate bubbles rising in the air lift pipe, a scum suction pipe having a lower end connected to the bottom of the air lift pipe, and a scum set at an upper end of the scum suction pipe A scum remover comprising a skimmer, wherein the scum suction pipe and the scum skimmer are horizontally rotatable about the air lift pipe.