JP2003181264A - Agitation apparatus of sewage treating tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitation apparatus of a sewage treating tank, which has a scum accumulation preventing function in itself without necessitating the installation of a separate scum removing equipment and by which sewage can be treated effectively at a low cost by circulating carriers efficiently. <P>SOLUTION: An agitator 2 is supported by a supporting body 1 in the sewage treating tank. An elbow-like discharge bend 9 having a discharge port 10 opened to the direction perpendicularly to a rotary shaft 4 of the agitator 2 is engaged with the peripheral part of an opening of a guide ring 6 to be rotated freely. A downward water current for agitating the sewage in the sewage treating tank is generated by turning the bend 9 to face the port 10 to the downward direction and an upward water current for diffusing the scum on the water surface is generated by turning the bend 9 to face the port 10 to the upward direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD OF THE INVENTION The present invention relates to a stirring device in a wastewater treatment tank.

[0002]

[Prior art and its problems] In a reaction tank for treating sewage,
Scum is generated in the stirring treatment process and floats above the water surface to form a layer. Then, the scum layer is supplemented with the carrier and the stirring is hindered, so that the treatment efficiency of the sewage is reduced.

As a countermeasure, conventionally, scum is removed by a shower type defoaming device S1 as shown in FIG.
Alternatively, as illustrated in FIG. 6, it is necessary to separately install a dedicated device in addition to the agitator, such as sucking scum by the pump S2 floated by a float, and an installation space for that purpose must be secured, and It also becomes a factor that pushes up the initial cost and running cost.

[0004]

It is an object of the present invention that the agitator itself has a scum accumulation preventing function without separately installing a device for removing scum, and effectively circulates the carrier to make effective waste water. It is an object of the present invention to provide an agitator in a sewage treatment tank in which treatment is performed at low cost.

[0005]

In the stirrer for sewage treatment tank according to the first aspect of the present invention, a propeller is fitted to the rotary shaft of a horizontal submersible motor, and a stirrer is formed by surrounding the outer periphery of the propeller with a guide ring. An elbow-shaped discharge bend, which is supported by a support in the processing tank, is rotatably fitted to the peripheral part of the guide ring, and has a discharge port opened in the direction orthogonal to the rotation axis, and the discharge port is directed downward. By rotating the discharge bend so that a downward water flow for stirring in the sewage treatment tank is generated, and by rotating the discharge bend so that the discharge port is in the upward direction, scum spreads on the water surface. It was configured to generate an upward water flow. Further, in the invention according to claim 2, on the premise of the agitating device in the wastewater treatment tank according to claim 1, the discharge port is directed upward by the pulling operation of the pulling tool which is anchored to the outer end of the discharge port and is guided upward. The discharge bend is rotated so that the discharge bend is rotated so that the discharge port is directed downward by an operation of loosening the pulling of the pulling tool.

[0006]

[Operation] When the horizontal submersible motor is driven when the discharge port is downward, a downward water flow is generated by the rotation of the propeller to stir the inside of the wastewater treatment tank. The horizontal submersible motor is reversed with the discharge port inverted. When the propeller is driven, an upward water flow is generated by the rotation of the propeller, and a scum diffusion action on the water surface is generated, so that the carrier easily circulates. Then, after the scum is diffused and the discharge port is inverted again to the downward state, the inside of the sewage treatment tank is agitated due to the downward water flow generated by the propeller. In this way, by alternately generating the upward water flow and the downward water flow, the carrier is efficiently circulated and effective wastewater treatment is performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment will be described below with reference to FIGS.

1 is a support such as a guide pipe standing upright in the sewage treatment tank, 2 is a propeller 5 fitted on a rotary shaft 4 of a horizontal submersible motor 3, and the outer periphery of the propeller 5 is surrounded by a guide ring 6. The stirrer is composed of, for example, an engaging member 7 attached to the rear of the horizontal submersible motor 3 to be supported by being supported by a supporting body 1 such as a guide pipe, and is vertically movable by operating a hanging chain 8. Reference numeral 9 indicates a discharge port 10 in a direction orthogonal to the rotary shaft 4 so as to be rotatably fitted to the peripheral portion of the guide ring 6.
Elbow-shaped discharge bend with opening 11 and discharge port 10
Is a towing tool such as a chain or rod that is anchored to the outer side of the upper part and is guided upward.
The discharge bend 9 rotates so that 0 is in the upward direction, and when the pulling of the pulling tool 11 is loosened, the discharge bend 9 is rotated so that the discharge port 10 is in the downward direction by the action of gravity.
However, it is also possible to change the direction of the discharge port 10 by temporarily raising the stirrer 2 above the water surface and directly rotating the discharge bend 9 by operating the suspension chain 8 without operating the pulling tool 11.

When the horizontal submersible motor 3 is driven in the state shown in FIGS. 1 and 2 in which the discharge bend 9 is rotated so that the discharge port 10 is in the downward direction, the downward flow of water is generated by the rotation of the propeller 5 and the sewage treatment is performed. Stir the inside of the tank. Further, in the state of FIGS. 3 and 4 in which the discharge bend 9 is rotated so that the discharge port 10 is directed upward, an upward water flow is generated to generate a scum diffusion action on the water surface, and the carrier is easily circulated. Become. 1 and 2 in which the discharge bend 9 is rotated so that the discharge port 10 is directed downward again after the scum is diffused, the interior of the sewage treatment tank is agitated due to the downward flow of water. In this way, by alternately generating the upward water flow and the downward water flow, the carrier is efficiently circulated and the effective wastewater treatment is performed. However, the rotation operation of the discharge bend 9 by the traction tool 11 described above is performed on the water surface. May be performed manually by visually recognizing, or intermittently by automatic operation.

[0010]

According to the stirrer in the sewage treatment tank of the present invention, the stirrer itself has a scum accumulation preventing function,
Since the carrier is efficiently circulated and effective wastewater treatment is performed, it is not necessary to separately install a device for removing scum as in the related art, and there is an advantage that initial cost and running cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view illustrating an operation mode of a stirring device in a wastewater treatment tank according to the present invention, showing a state in which a discharge bend is rotated so that a discharge port faces downward.

FIG. 2 is a vertical sectional side view taken along the line AA of FIG.

FIG. 3 is an explanatory view illustrating an installation mode of a stirring device in a wastewater treatment tank according to the present invention, showing a state in which a discharge bend is rotated so that a discharge port faces upward.

FIG. 4 is a vertical sectional side view taken along the line BB in FIG.

FIG. 5 is an explanatory view illustrating an installation mode of a conventional stirring device in a wastewater treatment tank, showing a case where a shower-type defoaming device is additionally provided.

FIG. 6 is an explanatory view illustrating a conventional installation mode of a stirring device in a sewage treatment tank, showing an example in which a scum suction device using a floating pump is provided side by side.

[Explanation of symbols]

1 support 2 stirrer 3 Horizontal submersible motor 4 rotation axes 5 propellers 6 Guide ring 9 Discharge bend 10 outlets 11 Tow

Claims (2)

[Claims] 1. A stirrer in which a propeller is fitted to the rotary shaft of a horizontal submersible motor and the outer circumference of the propeller is surrounded by a guide ring is supported by a support in a wastewater treatment tank, and the stirrer is rotated around the circumference of the guide ring. An elbow-shaped discharge bend, which is movably fitted and has a discharge port opened in the direction orthogonal to the rotation axis, is attached, and by rotating the discharge bend so that the discharge port faces downward, stirring in the sewage treatment tank can be performed. Sewage treatment tank, which is configured to generate an upward water flow for scum diffusion on the water surface by rotating the discharge bend so that the downward water flow for Stirrer inside. 2. The discharge bend is rotated so that the discharge port is in an upward direction by the pulling operation of the pulling tool that is anchored and guided upward at the outer end of the discharge port, and the discharge port is downward by the operation of loosening the pulling of the pulling tool. The stirring device in the wastewater treatment tank according to claim 1, wherein the discharge bend is configured to rotate in a direction.