JPH05228488A - Microbial column for water treatment - Google Patents

Abstract

PURPOSE:To minimize the use of power and thereby supply the air efficiently to the deepest area so that bacterial treatment can be performed. CONSTITUTION:The interior of a bacterial reaction tank for waste water treatment of a required size is divided at least in more than two sections in a water depth direction using a shelf-like partition screen 4. In addition, an aeration device is provided in the each partitioned chamber divided in the form of a shelf using the partition screen 4. Further, each partition section is filled with a fixing microbe, and a column 11 is installed so that the microbial concentration becomes higher in the water depth direction. After that, a required minimum quantity of air is supplied to the each partitioned section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microbial column for water treatment, which minimizes power and efficiently supplies air to a deep water region and performs biological treatment.

[0002]

2. Description of the Related Art A large amount of organic substances are contained in domestic, industrial and other waste water. This wastewater is biologically treated to be pollution-free, and then discharged to rivers, lakes and marshes. The aeration method is generally used as a method for biologically treating this wastewater. In this aeration method, air is supplied to wastewater and aeration is performed while stirring, and as an example, Japanese Patent Publication 55-
There is one disclosed in Japanese Patent Publication No. 29756. This is to arrange a cylindrical body in the tank, and to provide a screw in this cylindrical body, thereby blowing air into the wastewater in the cylindrical body to generate a downward flow, and after reaching the bottom of the tank, the outer circumference of the cylindrical body This is a method of circulating the inside of the tank by making the part upward flow.

[0003]

In recent years, it has become difficult to obtain sufficient land for wastewater treatment in the vicinity of a large city. Therefore, deep-water aeration tanks are being adopted to treat the increasing amount of wastewater in a limited space each year. However, aeration at high water depth requires a large amount of power due to the water pressure, and its treatment efficiency is poor.

It is an object of the present invention to effectively supply oxygen into wastewater with respect to input aeration power.

[0005]

The present invention has been made to achieve the above object, and in a biological reaction tank for wastewater treatment having a required size, the inside of the reaction tank is divided into a shelf plate by a partition screen. The gist is that at least two tanks are partitioned in the water depth direction, and an aeration device is provided in each partition chamber partitioned into shelf-like shapes by this partition screen.

[0006]

In the deep reaction tank, a solid-liquid separation screen is used to form a shelf plate, which is partitioned into at least two layers in the depth direction of the water, and each partition chamber is equipped with an aeration device and, if necessary, filled with immobilized microorganisms. Then, the concentration of microorganisms is increased in the water depth direction, and control is performed so that the minimum necessary air is supplied into each partition chamber. As a result, it is known that the solubility of oxygen is more likely to dissolve in a higher concentration range where the water pressure increases, and the amount of microorganisms at each depth is increased by using immobilized microorganisms so that the concentration of microorganisms increases in the depth direction. Supply the amount of air commensurate with. Therefore, it becomes possible to reduce the amount of unused air diffused into the atmosphere.
The amount of microbial oxygen used per input aeration power increases, and effective aeration treatment can be performed.

[0007]

EXAMPLE A microbial column for water treatment of the present invention will be described below with reference to the illustrated example. In the figure, 11 is an aeration reaction tank having a required size and depth, and the inside of the reaction tank 11 is divided by using partition screens 4 in a shelf shape so as to divide the inside of the reaction tank 11 into at least two stages in the depth direction. A low-concentration microbial reaction tank 1, a medium-concentration microbial reaction tank 2, and a high-concentration microbial reaction tank 3 are sequentially partitioned from the upper part, and aeration devices 12 are provided in the reaction tanks 1, 2 and 3 of each partition chamber.

Further, a water receiving tank 5 is arranged separately from the aeration reaction tank 1, and the sewage supplied into the water receiving tank 5 is supplied into the lowermost high-concentration microbial reaction tank 3 through a sewage pump 6 and a pipe 13. To do. In this case, the current plate 7 is installed so that the sewage is uniformly supplied into the reaction tank 3 from the bottom thereof.

Further, the aeration device 12 installed in the reaction tanks 1, 2 and 3 of each stage is supplied from the blower 8 through the air supply pipe 14 and the air regulating valve 9 to aerate in each stage tank. The amount of air supply should be adjusted to the appropriate value in each stage of the reaction tank.
Controlled by.

A solid-liquid separation screen 10 is provided in the uppermost reaction tank 1 so that only clear fresh water is filtered and drained from this screen 10.

As described above, the deep-layer reaction tank is partitioned in the water depth direction, and the reaction tanks 1, 2 and 3 in the respective compartments are filled with immobilized microorganisms in the water depth direction to form a microorganism column. The microbial column 11 is divided into three tanks in the depth direction by the reaction tank partition screen 4, and the respective reaction tanks 1, 2 and 3 are filled with entrapment-immobilized activated sludge, and the deeper reaction tank has a larger amount of microorganisms. adjust.

On the other hand, the sewage flowing into the water receiving tank 5 is evenly distributed by the sewage pump 6 and the pipe 13 to the highest concentration microbial reaction tank 3 at the deepest part of the microbial column via the straightening plate 7. Water treatment in the high-concentration microbial reaction tank is the first stage of the microbial column, and the wastewater contains a large amount of organic matter.

For this reason, it is desirable that the concentration of the microorganisms in the first tank is high. However, since the microorganisms require a large amount of oxygen in order to decompose the organic matter, oxygen deficiency is a concern. Since the water pressure is large, the solubility of oxygen is high and the environmental conditions are maintained so that the amount of microorganisms can be maintained at a high concentration.

At the same time, however, there is a problem that the air pushing pressure of the blower becomes large. Therefore, the power for feeding the blower is such that the required amount of air is sent only to the high-concentration microbial reaction tank and is controlled to the minimum.

The sewage thus treated in the first step is transferred as an upward flow to the upper middle-concentration microbial reaction tank 2, but the high-concentration microbial pellets are blocked by the reaction tank partition screen, Stay in the reaction tank. In the treatment in the second-stage medium-concentration microbial reaction tank, the organic matter in the wastewater is decomposed to some extent, so it is not necessary to increase the microbial concentration as in the deepest part. Only a considerable amount needs to be supplied to the tank.

The same operation and adjustment are performed in the third-stage low-concentration microbial reaction tank, but the number of stages of this treatment can be increased or decreased according to the target water quality of the treatment, and sewage is separated into solid-liquid separation in the final tank. The clear water is passed through the screen 10 to the disinfecting tank to complete the water treatment.

[0017]

INDUSTRIAL APPLICABILITY The microbial column for water treatment of the present invention divides the inside of the reaction tank into at least two tanks in the depth direction with a partition screen into partition plates, and each partition chamber partitioned into shelf plates with this partition screen. Since the aeration device is installed in the column, the microbial column has a vertical structure, space can be saved, and the amount of high-concentration microorganisms can be retained in a high water depth area where oxygen solubility is high, thus improving treatment efficiency. Further, it is possible to control the amount of air according to the amount of microorganisms and the water depth, and by performing the minimum required amount of aeration at each water depth, there is an advantage that the amount of oxygen used by microorganisms per aeration power input increases.

[Brief description of drawings]

FIG. 1 is an explanatory view of a microorganism column for water treatment of the present invention.

[Explanation of symbols]

 1 Low-concentration microbial reaction tank 2 Medium-concentration microbial reaction tank 3 High-concentration microbial reaction tank 4 Reactor partition screen 5 Water receiving tank 6 Sewage pump 7 Rectifier 8 Blower 9 Air regulating valve 10 Solid-liquid separation screen 11 Microbial column

Claims (2)

[Claims] 1. A bioreaction tank for wastewater treatment having a required size, wherein the inside of the reaction tank is divided into at least two tanks in the depth direction by a partition screen, and the partition screen is used to form a shelf plate. A microbial column for water treatment, wherein an aeration device is provided in each of the partitioned compartments. 2. The biological reaction tank for wastewater treatment is partitioned into at least two tanks in the depth direction by a partition screen in the form of a shelf plate, and an aeration device is provided in each partition chamber and immobilized microorganisms are provided in each partition chamber. A microbial column for water treatment, characterized in that the column is installed so that the microbial concentration is high in the depth direction of the water, and the minimum amount of air required for each compartment is supplied.