JP2505133Y2 - Water treatment device with integrated reaction tank and precipitation tank - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] This invention applies to water pretreatment and sewage 3
The present invention relates to the improvement of reaction tanks and precipitation tanks used for secondary treatment, industrial wastewater treatment, etc.

[0002]

2. Description of the Related Art As a means for treating waste water, a sedimentation tank is arranged at the rear stage of a bio-oxidation reactor, and a mixture of sludge and treated liquid discharged from the reactor at the front stage is settled and separated in the sedimentation tank at the rear stage, and the supernatant is removed. It is known that the liquid overflows and the sedimented sludge is returned to the reactor again.

Recently, a small-capacity, high-performance reaction tank called an ultra-high-load reaction tank has been developed as a bio-oxidation type reactor, and as a result, a small (for example, 1500φ) ultra-high-load reaction tank, The number of cases where large-scale (for example, 4000φ) settling tanks are installed side by side has increased, and due to imbalance of the installation area, vacant land that cannot be diverted is created, or it becomes disproportionate in terms of location and the installation location is selected. There are problems such as difficulty in

In order to avoid the above problems, if the ultra-high load reaction tank and the precipitation tank are installed separately according to the site conditions, the piping connecting them will become long and the facility cost and required power will be uneconomical. Another problem will arise.

[0005]

The present invention solves the above two problems at the same time, and efficiently installs a small-capacity ultra-high load reaction tank and a large-capacity sedimentation tank in parallel with a minimum installation area. Therefore, it is an object of the present invention to provide a water treatment facility that enables efficient use of the site and that is easy to maintain and manage.

[0006]

The present invention provides a means for solving the above-mentioned problems, in which a small diameter and a high height are provided at the center of a settling tank 1 having a large diameter and a low height. A cylindrical bio-oxidation reaction tank 2 is installed concentrically, and a cylindrical center well 3 whose lower part is opened with a slight gap S from the outer circumference of the reaction tank 2 in the precipitation tank 1 is rotatable. The raw water introducing pipe 4 and the air introducing pipe 5 are connected to the bottom of the reaction tank 2, and the reaction liquid discharged from the upper part of the reaction tank 2 is introduced into the gap S through the pipe 6. Moreover, the supernatant of the settling tank 1 overflows from the overflow weir 7, and the settled sludge is returned to the bottom of the reaction tank 2 through the sludge return pipe 8.

[0007]

EXAMPLE 1 In the figure, 1 is a donut-shaped precipitation tank having a large diameter and a low height, and a cylindrical biological oxidation treatment reaction tank 2 having a small diameter and a high height is installed concentrically at the center thereof. There is. Although the structure of the reaction tank 2 itself is arbitrary, a vertical moving disk is provided inside, raw water and air are introduced from the bottom, and the reaction liquid subjected to high-speed oxidation treatment is discharged from the upper part by the function of the vertical moving disk. Preference is given to using the known reactors of the type known as ultra-high load reactors.

Inside the settling tank 1, a cylindrical center well 3 having an open lower portion is arranged with a slight gap S from the outer circumference of the reaction tank 2. This center well 3
Is rotatable, and is driven to rotate at a very low speed by a motor M via a speed reducer (not shown).

A raw water introducing pipe 4 and an air introducing pipe 5 are connected to the bottom of the reaction tank 2, and a pipe 6 is connected to the upper portion of the reaction tank 2 to discharge the reaction liquid through the pipe 6. It is configured to be guided to the gap S through the above.

An overflow weir 7 is provided on the outer peripheral upper edge of the settling tank 1, and the treated water overflows from the overflow weir 7.
On the other hand, the settled sludge merges with the raw water via the sludge return pipe 8,
It is designed to be returned to the bottom of the reaction tank 2. In addition, P is a pump for sludge return.

Reference numeral 9 denotes a sludge attractor suspended from the center well 3, which is slanted at a slight speed together with the center well 3 which is rotationally driven by a motor M, and sludge accumulated on the bottom of the settling tank 1 is inclined. It is for scraping along the center portion, and the structure itself is known.

[0012]

Since the present invention has the above-described structure, the raw water introduced from the bottom of the biological oxidation treatment reaction tank 2 is oxidized in the reaction tank 2 and the reaction solution is discharged from the upper pipe 6. It

This reaction solution is introduced into the gap S between the outer periphery of the reaction tank 2 and the center well 3, and the center well 3
A flow in the circumferential direction is generated with the rotation of, and is then inverted at the lower open end and introduced into the settling tank 1 to be separated by sedimentation.

The supernatant liquid separated by settling overflows from the overflow weir 7 and is discharged as treated water, and the sludge settling at the bottom is scraped by the sludge scraper 9 and passed through the sludge return pipe 8 to the reaction tank. It is returned to No. 2 and bio-oxidized again.

[0015]

According to the present invention, a large-diameter and low-height sedimentation tank 1 and a small-diameter, high-height biological oxidation treatment reaction tank 2 are integrated, so that a small installation area can be efficiently and compactly installed. An ultra-high-load reactor with a large capacity and a large-capacity sedimentation tank can be installed side by side, which not only enables effective use of the site but also requires short piping and allows easy maintenance for maintenance and inspection. Processing equipment can be provided.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.

[Explanation of symbols]

 1 Precipitation tank 2 Bio-oxidation reaction tank 3 Center well 4 Raw water introduction pipe 5 Air introduction pipe 6 Piping 7 Overflow weir 8 Sludge return pipe 9 Vertical baffle plate 9 Sludge attractor M Motor P Pump S Gap

Claims (2)

(57) [Scope of utility model registration request] 1. A large-diameter, low-height settling tank (1) with a small-diameter, high-height cylindrical biooxidation reaction tank (2) at the center.
Are installed concentrically, and the reaction tank is placed in the precipitation tank (1).
A cylindrical center well (3) with an open lower part was rotatably arranged with a slight gap (S) from the outer periphery of (2), and a raw water inlet pipe (4) was installed at the bottom of the reaction tank (2). ) And air inlet pipe
(5) is connected, the reaction solution discharged from the upper part of the reaction tank (2) is introduced into the gap (S) through the pipe (6), and the supernatant of the precipitation tank (1) is The sludge that overflows from the overflow weir (7) and the settling sludge passes through the sludge return pipe (8) to the reaction tank.
A water treatment device in which a reaction tank and a precipitation tank are integrated, wherein the water is refluxed to the bottom of (2). 2. A sludge scraper at the bottom of the center well (3)
The water treatment device according to claim 1, wherein (9) is suspended.