JPH027680Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an apparatus for returning a portion of an oxidizing liquid to a denitrification tank in relatively small-scale water treatment.

[Technical background of the invention and its problems]

In conventional water treatment, a portion of the treated liquid oxidized in the oxidation tank is returned to the anaerobic denitrification tank to reduce nitrate nitrogen and nitrite nitrogen in the oxidized water, as shown in Figure 1. Then, a vertical pipe 20 is inserted into the water of the oxidation tank 2, and an overflow pipe 21 is led out from the middle of this vertical pipe 20 onto the water surface of the anaerobic denitrification tank 1.
Furthermore, a compressed air introduction pipe 22 is inserted into the vertical pipe 20, and compressed air is sent into the introduction pipe 22.
Air bubbles are dispersed in this water to reduce the specific gravity of the liquid and raise the water level in the vertical pipe 20, causing the liquid to flow into the overflow pipe 20.
However, in order to raise the water level in the vertical pipe 20, it was necessary to send a large amount of air, which required a large amount of power from the air compressor. Furthermore, since the amount of overflow cannot be adjusted, it is necessary to either allow a large amount to overflow at once or to stop the overflow.

[Purpose of invention]

In view of the above-mentioned problems, the present invention includes a denitrification tank in which anaerobic treatment is performed, an oxidizing liquid tank in which oxidizing liquid is stored,
The main body of the pump is inserted into the oxidizing liquid tank, and the pump main body receives a portion of the compressed air for aeration and has a valve at the lower end inlet that is closed by the introduction of compressed air and opened by water pressure. and a discharge tube that branches from near the suction port of the suction tube and rises above the liquid surface to discharge the oxidizing liquid into the denitrification tank. The purpose is to suck up a portion of the liquid and discharge it into a denitrification tank, thereby returning the oxidizing liquid with a small amount of power and making it possible to adjust the oxidizing liquid.

[Summary of the idea]

The present invention consists of a denitrification tank where anaerobic treatment is performed, an oxidizing liquid tank where oxidizing liquid is stored, and a pump body inserted into the oxidizing liquid tank. A part of the suction cylinder is introduced into the lower end, and has a valve that closes when compressed air is introduced into the lower end suction port and opens by water pressure. and a discharge tube for discharging the oxidizing liquid into the denitrification tank, and a portion of the aeration compressed air acts to suck up the oxidizing liquid.

[Example of idea]

An embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a denitrification tank into which raw water is introduced and subjected to anaerobic treatment; 2 is an oxidizing liquid tank; an aeration pipe 4 branched from a compressed air pipe 5 led out from an air compressor 3 is introduced;
Furthermore, the pump body 6 is inserted.

The pump body 6 includes an elongated tubular suction tube 7 that is vertically inserted deep into the water above the water surface of the oxidizing liquid tank 2, and is branched from near the lower end of this suction tube 7 and stands up along the suction tube 7 with the upper end above the water surface. A vent pipe 18 is communicated with the upper end of the suction cylinder 7, and a plate-shaped valve 11 faces the valve seat 10 of the suction port 9 opened at the lower end. It is pivoted so that it can be opened and closed. Furthermore, the upper end of the discharge tube 8 branched near the suction port 9 is bent so that the discharge port 12 is opened above the water surface of the denitrification tank 1 through the partition wall 13 . Further, the vent pipe 18 is communicated with the compressed air pipe 5 through a three-way switching solenoid valve 14, and by switching the passage 15, the suction pipe 7 is communicated with the compressed air pipe 5 or the atmosphere. Further, the three-way switching solenoid valve 14 is connected to an operating power supply board 16 having a timer for setting the switching time of the solenoid valve 14. 1
7 is a power source.

Next, the operation of the above embodiment will be explained.

The raw water introduced into the denitrification tank 1 is decomposed under anaerobic conditions, and the liquid is introduced into the oxidizing liquid tank 2, where it is oxidized by the inserted aeration pipe 4, and a portion is discharged. Further, in the illustrated state, the oxidizing liquid is inside the suction tube 7 of the pump body 6 inserted into the oxidizing liquid tank 2.
It has been introduced up to the water level of . At this time, the passage 15 of the solenoid valve 14 is in communication with the compressed air pipe 5 at position a, and a part of the compressed air of 1000 mma.q to 2000 mma.q sent to the aeration pipe 4 is forced into the suction cylinder 7 via the ventilation pipe 18. The liquid that had been introduced is pushed down and valve 1
1 is closed, the liquid is pushed up into the discharge cylinder 8, and is discharged into the denitrification tank 1 from the discharge port 12 at the tip. A part of the air sent to the aeration pipe 4 in this way is introduced into the suction cylinder 7, but air is still being diffused from the aeration pipe 4. Next, when the timer operates at a set time and the passage 15 of the solenoid valve 14 is switched to position b, the introduction of compressed air is cut off and the passage 15 communicates with the atmosphere. Since the inside of the suction cylinder 7 is communicated with the atmosphere through the ventilation pipe 18, the valve 11 is pushed open by the water pressure, and the liquid is introduced into the suction cylinder 7 up to the water level of the tank 2. At this time, the entire amount of compressed air is sent to the aeration pipe 4.

The above operations are repeated, and a portion of the oxidizing liquid in the oxidizing liquid tank 2 is intermittently returned to the denitrification tank 1.

In the above embodiments, the oxidizing liquid tank 2 as an oxidizing tank is provided adjacent to the denitrification tank 1. In some cases, when another tank is interposed between the denitrification tank 1 and the oxidizing liquid tank 2, the oxidizing liquid can be guided to the denitrifying tank 1 using the gutter 19 as shown by the chain line in the figure.

[Effect of idea]

According to the present invention, the pump body is composed of a denitrification tank in which anaerobic treatment is performed, an oxidizing liquid tank in which oxidizing liquid is stored, and a pump body inserted into the oxidizing liquid tank. A part of the air is introduced intermittently, and a suction cylinder has a valve that closes by introducing compressed air into the lower end suction port and opens by water pressure. Since it consists of a discharge tube that rises upward and discharges the oxidizing liquid into the denitrification tank, the pump body uses the pressure of compressed air for aeration to pump up the oxidizing liquid without using any other power source. It can be transferred to the denitrification tank, and since only a portion of the compressed air used in the pump body is sufficient for aeration, there is no problem with aeration, and the pump body is Because of its simple structure, there are few breakdowns and maintenance is easy. Furthermore, since the opening and closing of the valve is controlled by adjusting the compressed air introduction pipe, it is also possible to arbitrarily adjust the amount of oxidizing liquid transferred.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of a conventional device, and FIG. 2 is a vertical side view of an oxidizing liquid return device showing an example of the implementation of the present invention. DESCRIPTION OF SYMBOLS 1... Denitrification tank, 2... Oxidizing liquid tank, 6... Pump body, 7... Suction cylinder, 8... Discharge cylinder, 9... Suction port, 11... Valve.

Claims (1)

[Scope of utility model registration request] It consists of a denitrification tank in which anaerobic treatment is performed, an oxidizing liquid tank in which oxidizing liquid is stored, and a pump body inserted into this oxidizing liquid tank. A suction cylinder has a valve that is introduced into the lower end suction port by introducing compressed air and opens by water pressure, and the suction cylinder has a valve that branches near the suction port and rises above the liquid surface. An oxidizing liquid return device for water treatment, comprising a discharge tube for discharging the oxidizing liquid to the denitrification tank.