JPH0721279Y2 - Aeration device for sewage treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an aerator for sewage treatment using an air diffuser and a contact material for purifying sewage such as wastewater and sewage.

(Prior Art) Conventionally, an aeration tank has been used for wastewater treatment. Regardless of whether it is a batch type or a continuous type, this aeration tank is equipped with a tube equipped with a nozzle for generating bubbles at the bottom of the tank, and by blowing air into this tube, the oxygen dissolution rate in wastewater is increased and organic pollution is increased. It promotes the decomposition reaction by aerobic microorganisms of high quality. In addition to this, re-aeration is also performed to make the surface of sewage undulate and promote the dissolution of oxygen.

(Problems to be solved by the invention) Since the means for injecting air into the wastewater to increase the oxygen dissolution rate in the wastewater is performed by the air nozzle, in order to increase the oxygen dissolution rate, the air pressure should be increased or the air nozzle should be used. There is a limit because it must be increased. Therefore, many proposals have been made to improve the contact efficiency of aerobic microorganisms to wastewater.

The present invention provides a contaminated aerator for treating sewage, in which convection is caused by aeration in sewage, and aerobic microorganisms are contacted during the convection and maintenance can be easily performed.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention arranges a contact material in an aeration tank with a space above and below the aeration tank, and vertically arranges the contact material in the central part of the material. A water channel penetrating therethrough is bored, an air diffusion box is hung on the lower part of the water channel with a string or the like, and an upper diameter expanding cylindrical body protruding upward is provided on the upper part of the water channel.

(Operation) Since the present invention is configured as described above, when air is sent to the diffusing box, air is discharged as bubbles from the diffusing box into the water channel of the material. While touching, the air rises along with the sewage, jets out from the upper end of the expanding cylinder, is sprayed on the material, and some of the air in the bubbles is released into the air, while other air and moisture are in the material. Descend through
In the meantime, it comes into contact with aerobic microorganisms (adherent microorganisms), undergoes oxidative decomposition, and organic matter settles into excess floc sludge. It is sufficient to continue such convection to purify the wastewater and drain the supernatant water.

Further, since the diffusing box is suspended by a string, it is possible to easily perform cleaning, repair, replacement, or sludge removal by pulling up the diffusing box. If the drainage is done from the bottom, the rest of the operation is just the control of the contact material and there is no inconvenience in operation.

This device can also be used in the activated sludge process.

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

In FIGS. 1 and 2, the aeration tank 1 has a cylindrical shape,
The top is open and the bottom is mortar-shaped. A valve 1a for sludge discharge is provided at the center of the bottom.

In the aeration tank 1, the contact material 2 is arranged without any gap while maintaining a space above and below. The contact member 2 may be, for example, a honeycomb-shaped core installed so that the through holes are oriented in the vertical direction, and a large number of plastic short cylinders are filled from above from an outer frame such as a disc-shaped cage. You can use what you have done.
The point is that it has a structure that increases the area of contact with sewage.

A cylindrical water channel that penetrates vertically is provided at the center of the contact member 2.

At the lower part of the water channel 3, an air diffuser box 4 is suspended from above the aeration tank 1 by a string, a wire, a chain or the like 5.

As shown in FIG. 3, the air diffuser box 4 includes a short tubular body 6 having a hollow portion 8 in the upper portion and a weight portion 9 in the lower portion, a hanging band 7, and a hollow portion located above the short tubular body 6. Air duct connected to section 8
10, and is arranged annularly from the hollow portion 8 to the inner wall of the short tubular body 6,
And a plurality of air ejection holes 11 provided so as to penetrate therethrough.
A chain 5 is connected to the hanging band 7 and is suspended from an appropriate position above the aeration tank 1. The air diffuser box 4 can be pulled up from the hole 3 by the chain 5. Air supply duct 10
Is connected to an appropriate air compressor, etc. 12, and the air supply duct
Send compressed air to 10.

At the upper part of the water channel 3, there is a cylindrical body 13 whose diameter is increased toward the upper end.
Is provided so as to project.

Further, in the figure, 15 is a sewage or raw water supply duct, and 16 is a treated water extraction duct.

When compressed air is sent from the air compressor 12 to the air diffuser 4 of the aeration tank 1 having the above structure, air is ejected from the air ejection holes 11, 11 ... of the air diffuser 4 to the center of the air diffuser 4. Ascends as bubbles through the path. Then, the sewage and bubbles rise along the water channel 3 of the contact member 2, jet out from the upper end of the cylindrical body 13 provided above the contact member 2, pass through the contact member 2 and move toward the lower part of the air diffuser box 4 convection ( Circulation). Oxygen is dissolved while sewage is in contact with air and circulates, and when it passes through the contact material, minute floating substances, colloidal or soluble organic substances are adsorbed on the biofilm formed on the contact material. It is oxidatively decomposed and settled as excess sludge.

In the present invention, since the air diffuser box 4 is suspended from above in the water channel of the contact material 2, when the biofilm is used, when the biofilm becomes thicker, the biofilm is aerated from the contact material 2 in the aeration tank. When settling on the bottom and accumulating on the bottom, the aeration box 4 can be pulled up through a water channel, and the sludge at the bottom can be easily discharged from the water channel by using a suction hose or a sludge pump.

The aeration tank shown in FIGS. 1 and 2 has a cylindrical shape, but it may have another rectangular tube shape. In the figure, 17
Is a settling tank.

Another embodiment shown in FIG. 4 is a case where a plurality of air diffusers 4 are provided in the aeration tank 1. The same members as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

As can be seen from this embodiment, the water penetrating vertically in the center of the contact material 2 and 3 need only be in a position for efficiently discharging the dirty water discharged from the water channel 3 above the material 2. Therefore, the "central portion" of the drilled position has such a meaning.

(Effect) Since the present invention is configured as described above, it is possible to spray the dirty water sucked in from the upper expanded cylinder in the form of a contact material, and to the air of the dirty water during this period. The chances of contact can be increased and sewage can be spread all over the contact material. Further, since the air diffuser box is mounted by suspending it in the water channel of the contact material, there are effects that the maintenance is easy and that the sludge can be drawn out through the water channel, so that the work is also easy.

[Brief description of drawings]

FIG. 1 is a vertical side view of the device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a partially cutaway perspective view of an air diffuser box, and FIG. 4 is a vertical side view of another embodiment of the present invention. Is. 1-Aeration tank, 2-Contact material, 3-Water channel, 4-Aeration box, 13
~ Upper expanded cylinder.

Claims (1)

[Scope of utility model registration request] 1. A contact material is placed in an aeration tank with a space above and below the material, and a water channel is formed vertically through the center of the material, and a water channel is formed in the lower part of the water channel. An aerator for sewage treatment, wherein an air box is hung with a string or the like, and an upper diameter expanding cylindrical body protruding upward is provided in the upper part of the water channel.