JPH1043784A - Fluid bed type biological treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the flow property of carriers and to increase an effective capacity to an installation area by providing the top of the one half surface in the bottom of a treating vessel which is a rectangular parallelepiped with an air diffuser forming an ascending flow area and providing the lower part of the descending flow area on the other half surface of the bottom with an inclined bottom wall. SOLUTION: The ascending flow area A side of the treating vessel 1 is provided with an introducing pipe 2 and the air diffuser 3 is installed to the bottom 1c. An underwater partition plate 4 is installed in the central part of the treating vessel 1 by inclining this plate to the ascending flow area A side. The lower part of the descending flow area B side of the treating vessel 1 is provided with the inclined bottom wall 5 rising to a drain side lateral wall 1b. Further, the upper part of the descending flow area B side is provided with an outflow preventive plate 8 having a perpendicular part 6a which falls to the drain side lateral wall 1b side and curves perpendicularly. When the underwater partition plate 4 is inclined to the ascending flow area A side in such a manner, the sectional area is gradually narrowed in the lower part of the descending flow area B and, therefore, the swirling flow velocity is slow in the upper part and fast in the lower part. Consequently, the flow property of the carriers in the lower part of the descending flow area B is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed treatment apparatus used for treating organic wastewater.

[0002]

2. Description of the Related Art Conventionally, a treatment tank of a fluidized-bed biological treatment apparatus (hereinafter referred to as a treatment apparatus) used for treating organic wastewater has a structure shown in FIG.
As shown in Jpn. Pat. Appln. KOKAI Publication No. 6-34880, an outflow prevention plate 6A and a rectifying plate 8 are provided in a descending flow area B of a processing tank 1A. In some cases, a long inclined bottom wall 5A having a long inclined surface formed in a tapered shape near the device 3 was formed.

In the above treatment apparatus, the water to be treated introduced from the introduction pipe 2 together with the air bubbles from the air diffuser 3 travels through the underwater partition plate 4A to the ascending flow area A and the descending flow area B as carriers (not shown). Circulating). In subsidence area C,
Most of the carrier descends and is guided by the descending flow of the descending flow zone B, and is again introduced into the ascending flow zone A.

[0004]

The above-mentioned conventional fluidized bed processing apparatus has the following drawbacks.

First, a tapered inclined bottom wall 5A cut to the vicinity of the air diffuser 3 is required to guide the carrier, and the effective capacity for the installation area of the processing tank is small.

Second, since the inclined bottom wall 5A is deep and the inclined surface is long, the carrier may stay above the inclined bottom wall.
The current plate 8 is required in preparation for winding up the carrier, and as a result, the area of the sedimentation area in the processing tank increases, so that the effective capacity with respect to the installation area of the processing tank is small.

It is an object of the present invention to improve the fluidity of a carrier, reduce the size of an inclined bottom wall, increase the effective capacity with respect to the installation area, and simultaneously reduce the area of a sedimentation zone. An object of the present invention is to provide a processing device.

[0008]

SUMMARY OF THE INVENTION A fluidized bed biological treatment apparatus according to the present invention comprises a rectangular parallelepiped treatment tank having a rectangular bottom, and an air diffuser provided on one half of the bottom to form an ascending flow area. An inclined bottom wall provided at a lower part of a descending flow area on the other half surface of the bottom, an underwater partition plate provided at a central portion of the treatment tank and inclined toward the ascending flow area, And an outflow prevention plate provided at an upper part of the region.

[0009]

The operation of the present invention will be described with reference to FIG. Drainage, which is water to be treated, flows into the treatment tank 1 from the introduction pipe 2, passes through the ascending flow area A caused by the air lift effect by aeration, and descends in the descending flow area B in which aeration is not performed.
It turns inside the processing tank 1 and is purified while being in contact with the carrier, and is discharged from the drain pipe 7.

By tilting the underwater partition plate 4 at the center of the treatment tank 1 toward the upward flow area A, the lower part of the downward flow area B
Since the cross-sectional area is gradually narrowed, the swirling flow velocity is slower in the upper part and faster in the lower part. As a result, the fluidity of the carrier in the lower part of the descending flow zone B is improved, and the carrier is returned to the upward flow zone A.
Can be made smaller.

By this operation, the effective capacity with respect to the installation area of the processing tank 1 is increased, and the carrier is not wound up at the vertical portion 6a of the outflow prevention plate 6, so that the rectifying plate 8 conventionally used becomes unnecessary.

[0012]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a processing apparatus for explaining an embodiment of the present invention.

In FIG. 1, a processing tank 1 has a square bottom 1.
It is composed of a rectangular parallelepiped having a ratio of the long side of c to the effective water depth of 1: 2 or more. The bottom 1c of the processing tank 1 does not have to be a square, but it is preferable to make the bottom 1c since the effective capacity per installation area can be maximized.

An inlet pipe 2 is provided on the ascending flow area A side of the processing tank 1, and an air diffuser 3 is provided on the bottom 1c about 1 mm from the inlet side wall 1a.
/ 2 (half side). Depending on the angle of the central partition plate 4, the location of the diffuser 3 may be 以下 or less or 以上 or more from the introduction side wall 1a, but when the aeration is stopped, the carrier (not shown) flows again. Introducing side wall 1a
The flow starts most quickly when the air diffuser is installed up to about 1/2 of the distance.

In the central part of the treatment tank 1, the upper and lower gaps are placed one by one on the ascending flow zone A side so that the upper and lower gaps are each about 1/6 of the effective water depth.
The underwater partition plate 4 is installed at an angle of 5 to 25 °. The angle of inclination of the underwater partition may be 15 ° or less or 25 ° or more.
The wastewater flows quickly when inclined at an angle of about 25 °.

An inclined bottom wall 5 is provided at the lower portion of the downward flow zone B of the treatment tank 1 at about 45 ° from one-third of the length of one side of the bottom 1c to rise to the drain side wall 1b. On the upper part of the descending flow area B side, the drain side wall 1 is set at 45 ° from one third of the length of one side of the bottom part 1c from the drain side wall 1b.
b, 3/20 of the length of one side of the bottom 1c from the drain side wall 1b, or 3/20 of the length of one side of the bottom 1c.
Is larger than 0.5 m, an outflow prevention plate 6 having a vertical portion 6a that is bent vertically at about 0.5 m is provided.

The above and below gaps and angles of the central partition plate 4, and the rising position and angle of the inclined bottom wall 5 are numerical values at which the carrier flows best, and depend on the amount of carrier added. , May be greater than or less than the numerical value.

The length of the vertical portion 6a of the outflow prevention plate 6 is set to 1/10 to 1/5 of the effective water depth. This value is a value within a range in which the carrier is not involved in the sedimentation area, May be greater or less than that value, depending on. The wastewater flows into the treatment tank 1 through the introduction pipe 2, is treated while being in contact with the microorganism-adhering carrier rotating in the ascending flow area A and the descending flow area B in the treatment tank 1, and is discharged from the water distribution pipe 7.

The carrier used is a rectangular parallelepiped having a size of 3 to 5 mm or a sphere having a diameter of 3 to 5 mm.
One flows well. Hereinafter, an experimental example of the processing apparatus of the present invention will be described.

A capacity of 40 L, an angle of the underwater partition plate 4 of 20 °,
Processing tank 1 with vertical portion 6a of outflow prevention plate 6 having a length of 8 cm
To be treated was introduced. As a result, as shown in Table 1, the BOD concentration can be reduced to 6 to 12%,
Sufficient processing capacity was obtained.

[0021]

[0022]

[Table 1]

[0023]

As described above, according to the present invention, by inclining the submerged partition plate 4 toward the upward flow area A, the capacity of the sedimentation area can be reduced because the straightening plate is unnecessary, and the inclined bottom wall 5 can be reduced. Can be reduced in size. As a result, there is an effect that the effective capacity with respect to the installation area of the processing tank can be increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a processing apparatus for describing an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional processing apparatus.

[Explanation of symbols]

 1, 1A Treatment tank 1a Inlet side wall 1b Drain side wall 1c Bottom 2 Introductory pipe 3 Air diffuser 4, 4A Underwater partition plate 5, 5A Inclined bottom wall 6, 6A Outflow prevention plate 6a Vertical part 7 Water distribution pipe 8 Straightening plate A Upflow area B Downflow area C Settling area

Claims (2)

[Claims] 1. A rectangular parallelepiped processing tank having a rectangular bottom,
An air diffuser provided on one half of the bottom to form an ascending flow area, an inclined bottom wall provided below a descending flow area on the other half of the bottom, and a central part of the processing tank. A fluidized-bed biological treatment apparatus, comprising: an underwater partition plate provided to be inclined toward the ascending flow region; and an outflow prevention plate provided at an upper portion of the descending flow region. 2. The fluidized bed biological treatment apparatus according to claim 1, wherein the angle of inclination of the underwater partition plate is 15 to 25 °.