JPH09268636A - Aeration method for waste water stagnation part in sewage force feed pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve aeration effects by blowing air between a waste water surface in a pipeline and an internal circumferential top part of the pipe line from an upper to a lower stream, receiving the air by one end of a pipe arranged in the pipeline, and being emitted into the waste water from the other end of the pipe. SOLUTION: When a pump in a sewage force feed pipeline is stopped, air 3 is made to flow over a water surface 4 of a sewage stagnation part 2 from the upper stream side A to the lower stream side B at all times. Secondly, a pipe 5 is arranged in the adjacent to the sewage stagnation part 2, its top end 5a is opened toward the upper stream side A on the water surface 4, and the bottom end 5b is opened toward the lower stream side B under the water surface 4. Thirdly, a part of the air 3 passes from the opening of the top end 5a through the pipe 5, becomes small air bubbles 7 through holes of a porous plate 6 attached to the opening of the bottom end 5b, and is emitted into the waste water in the sewage stagnation part 2. This constitution can suppress the generation of hydrogen sulfide by aerating the waste water, simplify the structure, eliminate any specified power source, and facilitate its attachment to a place of difficult feeding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for aerating a sewage retention section in a sewage pumping pipeline.

[0002]

2. Description of the Related Art When pumping sewage with a pump, the generation of hydrogen sulfide due to anaerobicization inside the sewage pumping line poses a problem. As one of the countermeasures, it is effective to inject air into the sewage pumping pipeline.

By injecting air, it is possible to suppress the generation of hydrogen sulfide by creating an aerobic environment inside the sewage pumping pipeline. When the pump is continuously operated, the injected air and the sewage are mixed, but when the pump is stopped, the sewage retention part 2 is generated in the middle of the sewage pumping line 1 as shown in FIG. The air 3 flows from the upstream side A toward the downstream side B on the water surface of the dirty water retention portion 2, which is in a state of being separated into a gas phase and a liquid phase. 4 represents the surface of the accumulated sewage.

[0004]

As described above, when the pump is stopped, there is a problem that the gas phase and the liquid phase are separated from each other so that the sufficient aeration effect cannot be obtained and the anaerobicization of waste water proceeds.

An object of the present invention is to provide a method for aerating a sewage retention section which can prevent the progress of anaerobicization in the sewage retention section 2 even when the pump is stopped.

[0006]

A method for aerating a sewage retention section according to the present invention comprises: Air is blown from the upstream side to the downstream side, the air is received at one end of the pipe opened toward the upstream side above the sewage surface, and the other end of the pipe is opened below the water surface of the sewage surface, The air entered from the one end of the pipe is discharged to the waste water from the other end of the pipe to be aerated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A method for aerating a sewage retention section according to the present invention will be described below with reference to specific embodiments shown in FIGS.

[Embodiment. 1] FIG. 1 and FIG. 1], the air in the sewage pumping line 1 is in a state in which the air 3 flows from the upstream side A to the downstream side B on the water surface of the dirty water retention part 2 even in a stopped state.

A pipe 5 having an upper end 5a opened above the water surface 4 of the sewage and a lower end 5b opened below the water surface 4 of the sewage is provided near the sewage retention section 2 of the sewage pumping line 1. . The upper end 5a of the pipe 5 opens toward the upstream side A and the lower end 5a of the pipe 5
b is open toward the downstream side B. The opening at the lower end 5b of the tube 5 is closed by a porous plate 6.

As shown in FIG. 2, the pipe 5 is attached along the inner peripheral portion of the sewage pressure-feeding pipeline 1, and is designed so as not to obstruct the flow of dirty water during pump operation.
With this configuration, part of the air 3 flowing on the water surface when the pump is stopped is pushed through the opening of the upper end 5a of the pipe 5, passes through the internal passage of the pipe 5, and opens at the lower end 5b of the pipe 5. From the holes of the porous plate 6 attached to
And is discharged into the waste water in the waste water retention section 2. As a result, the sewage is aerated and the generation of hydrogen sulfide can be suppressed.

[Embodiment. 2] FIGS. 3 and 4 show [Embodiment. 2] is shown. This [embodiment. 2], [Embodiment. 1], the hood 8 is attached to the opening of the upper end 5a of the pipe 5. The opening area of the hood 8 on the upstream side A is larger than the opening area of the downstream side B, and the opening on the downstream side B is the pipe 5.
Is communicated with the opening of the upper end 5a. Others are described in [Embodiment. 1].

Due to this structure, even if the flow velocity of the air 3 is the same, the hood 8 having an opening area larger than the opening of the upper end 5a of the pipe 5 is attached to the pipe 5, so that Form. More air 3 is sent in than in the case of [1], and the [embodiment. 1]
More air bubbles 7 can be discharged than in the above case, and improvement of the aeration effect can be expected.

[0013]

As described above, according to the aeration method of the sewage retention section of the present invention, the pipe is provided between the sewage surface of the sewage retention section formed in the sewage pumping pipeline and the upper part of the inner circumference of the pipeline. Air is blown from the upstream side to the downstream side of the passage, and this air is received at one end of the pipe that is open toward the upstream side above the wastewater surface, and the other end of the pipe is opened below the water surface of the wastewater surface. Then, the air entering from the one end of the pipe is discharged to the waste water from the other end of the pipe to aerate, so that the air in the gas phase portion is mixed and aerated in the waste water that remains even when the pump is stopped, This makes it possible to suppress the generation of hydrogen sulfide.

Further, no special power source is required to send the air in the gas phase into the liquid phase, the structure is simple, and it can be carried out even in a place where it is difficult to supply power in the middle of the sewer pressure supply pipeline. Is.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. 1] Sectional view

FIG. 2 is an arrow view taken along line XX ′ in FIG.

FIG. 3 shows an embodiment of the present invention. 2] Sectional view

FIG. 4 is a view taken along the line YY ′ in FIG.

FIG. 5 is a cross-sectional view of a sewage accumulating portion generated while the pump is stopped.

[Explanation of symbols]

 1 Sewage pressure feeding pipe 2 Sewage retention part 3 Air flow 4 Water surface of wastewater while pump is stopped 5 Pipe 5a Pipe upper end 5b Pipe lower end 6 Porous plate 7 Bubble 8 Hood

Claims (1)

[Claims] 1. Air is blown from the upstream side to the downstream side of the pipeline between the sewage surface of the sewage retention section formed in the sewage pressure-feeding pipeline and the upper part of the inner circumference of the pipeline, and this air is blown. Is received at one end of the pipe that is open to the upstream side above the sewage surface, the other end of the pipe is opened below the water surface of the sewage surface, and the air entered from the one end of the pipe is supplied from the other end of the pipe. Aeration method of sewage retention part in sewage pressure transmission line which discharges and aerates sewage.