KR200221815Y1 - Fluidized bed system for sewage treatment - Google Patents

Abstract

The present invention relates to an air distribution device for supplying the gas required for the growth of microorganisms to the fluidized bed sewage treatment device, one side is open, the other side is formed with a plurality of through holes and 45 ° of the upper one side of the air distribution pipe It characterized in that the air distribution device for gas supply, characterized in that provided with an inclined surface.

The air distribution pipe and the fluidized bed sewage treatment apparatus using the same according to the present invention have the advantage of uniformly increasing the oxygen transfer rate in the treatment tank by using the power ratio less than the existing diffuser or the underwater aeration system by effectively circulating the sewage in the treatment tank. have.

Description

Fluidized bed system for sewage treatment

When air is blown into the sewage and stirred, various microorganisms multiply by using the organic matter in the sewage and form flocculating flocs. This is called activated sludge, and is composed of microorganisms such as bacteria, protozoa, and welfare animals, and non-biological inorganic and organic substances.

When activated sludge is mixed with oxygen, organic matter in sewage is adsorbed to activated sludge and oxidized or assimilated according to the metabolic function of the microbial group that forms activated sludge, and part of it is converted into activated sludge.

In the activated sludge method, oxygen is supplied into the reaction tank by blowing air or mechanical water agitation, and the activated sludge is kept in a suspended state by the water flow in the reaction tank.

At different interfaces, such as gases and liquids, solids and liquids, materials tend to be physically and chemically concentrated, a phenomenon commonly called adsorption. Adsorption of organic matter by activated sludge is a phenomenon in which organic matter is concentrated on the surface of activated sludge.

Mixing and abandoning the sewage and activated sludge removes the organics expressed as C-BOD from the sewage. Most organics in sewage are removed in a short time when they come into contact with activated sludge. This phenomenon is called initial adsorption. The organic matter removed by the initial adsorption is hydrolyzed and ingested into the microorganism to be oxidized and assimilated.

Therefore, the oxygen consumption of activated sludge is apparently independent of the organic matter removal amount and increases in proportion to the aeration time until oxidation and assimilation proceeds.

Oxygen consumption increases as sewage organics and their removal increases.

An acid pipe is used to blow air into the reaction tank, and the supplied oxygen mixes the aeration tank. Factors affecting the amount of oxygen delivered to the dissolved oxygen in the air are the size of the air bubble, the amount of air to be fed to the air diffuser, the arrangement of the air diffuser, and the flow rate of water. At the same blowing amount, as the size of the air bubble increases, the area where air and water contact each other decreases, so that the amount of oxygen transfer decreases.

In other words, when the size of the air bubble is doubled, the contact surface of air and water is reduced by half. In addition, the greater the rate of rise of the air flowing out of the air diffuser, the shorter the air bubbles reach the surface of the water and the oxygen transfer efficiency is reduced.

Therefore, it is effective to install the diffuser at the bottom of the aeration tank and to distribute the diffuser evenly at regular intervals.

The present invention relates to a fluidized bed sewage treatment apparatus for supplying air into a treatment tank in biological treatment of a sewage treatment plant.

Existing devices for supplying air to the sewage treatment plant have been used, such as diffusers and submersible pumps, but the replacement of facilities is required due to the high price of equipment compared to oxygen transfer efficiency.

Oxygen delivery devices, such as diffusers, have a plurality of small diameter holes to supply fine air into the treatment tank as mentioned above.

The gas supplied from the diffuser moves upward through the diffuser hole, which helps the aerobic microorganisms grow in the treatment tank. Therefore, for the smooth operation of the fluidized bed sewage treatment apparatus, uniform dispersion and mixing of the fluidizing gas supplied into the treatment tank is very important.

However, since the diffuser or submersible pump used in the conventional fluidized bed sewage treatment apparatus is only directed upward, it is not possible to promote the mixing motion of the fluid medium, and thus there is a limit in improving the reaction efficiency in the treatment tank. On the outer side, the problem that oxygen transfer rate does not occur easily occurred.

In this regard, the present invention provides an air distribution pipe capable of uniformly supplying air into a treatment tank, thereby increasing the activity of aerobic microorganisms in biological sewage treatment to smoothly remove organic substances from raw water to be treated.

In addition, another object of the present invention is to provide a fluidized bed sewage treatment apparatus that can maximize the oxygen transfer efficiency by maximizing the oxygen transfer efficiency by disposing the air distribution device properly.

1 is a three-dimensional view showing the structure of a fluidized bed sewage treatment apparatus according to an embodiment of the present invention

Figure 2 is a cutaway perspective view of the fluidized bed sewage treatment apparatus according to the present invention

Figure 3a and 3b is a plan view showing the shape of the air distribution pipe installed in the fluidized bed sewage treatment apparatus

** Description of symbols for the main parts of the drawing **

1: fluidized bed sewage treatment device 2: exhaust pipe

3: air inlet pipe 4: treated water inlet pipe

5: treated water discharge pipe 6: sludge discharge pipe

7: support stand 8: upper guide plate

9: Air distribution pipe support 10: Air distribution pipe

10a: inclination angle 10b: air distribution pipe air outlet

11: overflowware 12: lower guide plate

13 venturi nozzle

The present invention for achieving the above object is to be installed in the flow water and sewage treatment unit 1, such as a conventional diffuser or underwater aeration pump. The air supply pump for supplying air to the fluidized water and wastewater treatment device 1 is not shown in the drawing, but is provided on the outside of the treatment tank to supply air into the fluidized water and wastewater treatment device 1.

The raw water supply into the fluidized sewage treatment apparatus 1 is introduced into the treatment tank through the treated water inlet pipe 4 provided on one side of the upper portion of the fluidized sewage treatment apparatus 1.

The introduced treated water flows down to the lower surface of the fluidized sewage treatment apparatus 1, and at this time, the air required for the activation of microorganisms is introduced into the fluidized sewage treatment apparatus 1 through the air inlet pipe 3. And the treated water are mixed to help the growth of aerobic microorganisms in the fluidized sewage treatment apparatus (1).

This will be described in detail with reference to the accompanying drawings.

Figure 1 is a three-dimensional view showing the structure of the fluidized bed sewage treatment apparatus according to an embodiment of the present invention, Figure 2 is a cutaway perspective view of the fluidized bed sewage treatment apparatus according to the present invention, Figure 3a and 3b is a fluidized bed sewage treatment apparatus The top view which shows the shape of the air distribution line installed is shown.

As shown in FIG. 2, the treatment water supply into the fluidized sewage treatment apparatus 1 is made through the treatment water supply pipe 4, and the treated water is supplied by the air inlet pipe 3 while flowing downward. As the air escapes through the air distribution pipe 10, the air is rotated in the water and sewage treatment apparatus 1. At this time, the adsorption of organic matter occurs by the microorganisms, etc. present in the treatment tank, and the generated sludge is collected in the lower sludge collecting unit 14.

In order to collect the generated sludge into the sludge collection unit 14, the outer surface of the air distribution pipe support 9 must be perforated, and the sludge descends.

The air supplied through the air inlet pipe 3 is to be injected through the venturi nozzle 13, wherein the installation angle of the venturi nozzle 13 is preferably matched with the installation angle of the air distribution pipe 10.

It is important to reduce the dead-space in order to increase the treatment efficiency in the fluidized water and sewage treatment system 1. To this end, an upper guide plate 8 is installed at an elevated level due to the supplied air. Providing the guide plate 12 contributes to the improvement of processing efficiency.

The sludge collected by the sludge collection unit 14 is discharged to the outside through the sludge discharge pipe (6), the treated water is discharged through the treated water outlet pipe (5) beyond the overflow wear (11).

The main feature of the present invention is that the installation angle of the venturi nozzle 13 is matched with the air distribution pipe 10 so as to uniformly supply the air into the fluidized water and wastewater treatment apparatus 1, and the air content to increase the treatment efficiency. Characterized in that the upper surface is inclined so as to have a rotational force around the center of the installation angle of the pipe (10).

3a and 3b shows the shape of the air distribution pipe 10 of the present invention. As shown in the figure, it can be seen that the upper surface of the air distribution pipe 10 is inclined to be inclined, which shows the shape of inducing the flow so that the supplied air chamber can have rotational force as shown in FIG. 3A.

Since the diffuser or submersible pump used in the conventional fluidized bed sewage treatment apparatus is only directed upward, there is a limit in improving the reaction efficiency in the treatment tank because it cannot promote the mixing motion of the fluid medium. When installed at the bottom of the fluidized water and sewage treatment device, it is possible to distribute the air evenly throughout the reaction vessel, so that all the supplied air can be used by the microorganisms in the reaction vessel without loss.

That is, in the past, the oxygen transfer rate does not occur well in the upper outer side and the lower outer side of the reactor, but when the air distribution device according to the present invention is applied, the microorganisms are effectively grown by circulating the air supplied to the entire reactor effectively without loss. It can help to improve the sewage treatment efficiency.

Claims (2)

A treatment water supply pipe 4 for supplying treatment water is provided on one side of the upper portion of the fluid water treatment system 1; The air supplied through the air inlet pipe (3) is to be injected through the venturi nozzle 13, wherein the installation angle of the venturi nozzle 13 is provided to match the installation angle of the air distribution pipe (10); A sludge discharge pipe for treating sludge generated during the treatment process is installed under the flow water and sewage treatment apparatus 1; Flow water and sewage treatment apparatus characterized in that the upper guide plate (8) and the lower guide plate (12) is provided as a device for reducing the dead-space to increase the treatment efficiency in the treatment tank In the above, the air distribution pipe (10) is formed in a cylindrical sphere, and has a shape in which the upper part is inclined to be inclined so that the air bubbles have rotational power when supplied into the treatment tank.