JP2002210481A - Carrier fluidizing biological filtration tank and method for using carrier to be used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for using carrier in a support fluidizing biological filtration tank, in which a filtration part is promptly formed with desired quantity of the carrier, the desired quantity of the carrier is promptly turned and fluidized and stable sewage disposal is efficiently performed. SOLUTION: In the method for using the carrier in the carrier fluidizing biological filtration tank, as the carrier used for the carrier fluidizing biological filtration tank, a carrier for circling 2 which has a specific gravity a little heavier than water and is circled and fluidized by diffused air and a carrier for constituting 2 filltration part 3 which has a specific gfavity heavier than the carrier for circling 2 and constitutes a filtration part by settling and still standing, are used. The carrier for circling 2 is circled and fluidized all the time and the carrier for constituting the filtration part 3 constitutes the filtration part all the time. Then, the filtration part is formed with the desired quantity of the carrier promptly and the desired quantity of the support is circled and fluidized promptly in accordance with the charging quantities of the carrier for circling 2 and the carrier for constituting the tration part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier fluidized biological filtration tank and a method for using a carrier used in the tank. The carrier-flowing biological filtration tank used for sewage treatment is composed of a decomposition function that the microorganisms attached to the carrier are swirled and flown by the diffuser to decompose organic substances in the sewage, and a filtration unit that sediments the carrier by its own weight. It also has a filtration function of filtering wastewater and separating it into more clear treated water and sludge. In order to sufficiently exhibit these functions, a carrier suitable for swirling flow and a carrier suitable for constituting a filtration unit are well combined, and a carrier flowing biological filtration tank that enhances the effect of sewage treatment and is used for this. The present invention relates to a method for using a carrier.

[0002]

2. Description of the Related Art Heretofore, only a single type of carrier has been used in a carrier fluidized biological filtration tank, and carriers of the same material and the same specific gravity, such as polyvinyl alcohol gel, have been used. The carrier is introduced into the sewage in the carrier-flowing biological filtration tank, and the sewage is agitated and flown with air or the like, and microorganisms are attached to the carrier to decompose the organic matter in the sewage. Then, the sewage is purified while filtering the sewage by the carrier constituting the filtration unit.

[0003]

However, in order to efficiently carry out sewage treatment, in any case, a desired amount of the carrier is quickly swirled and the desired amount of the carrier is settled and settled and filtered. The part needs to be formed promptly.
However, in the conventional carrier fluidized biological filtration tank, when the carrier that swirls and flows and the carrier that forms the filtration unit and the carrier that forms the filtration unit are settled and allowed to stand, the carrier cannot be settled due to filtration resistance in the filtration unit. , There is a problem with the sewage treatment function.

In view of the above circumstances, the present invention enables a filtration section to be formed promptly with a desired amount of carrier, and allows a desired amount of carrier to quickly swirl and flow, thereby efficiently performing a stable sewage treatment. An object of the present invention is to provide a carrier fluidized biological filtration tank that can be used and a method of using a carrier used in the tank.

[0005]

According to the first aspect of the present invention, there is provided a carrier-flowing biological filtration tank, wherein a carrier to be introduced into sewage in the tank has a specific gravity slightly higher than that of water and a swirling carrier which swirls and flows by aeration.
It is characterized by having a specific gravity greater than that of the carrier for swirling and comprising a carrier for constituting a filtration portion which is settled and settled to constitute a filtration portion. The carrier-flowing biological filtration tank according to claim 2 is the invention according to claim 1, wherein the carrier-flowing biological filtration tank comprises a flow chamber provided at an upper portion in the vessel and a biological filtration chamber provided at a bottom portion in the vessel. The biological filtration chamber is formed in a stationary part which is not affected by a swirling flow generated in the fluid chamber. 4. The method for using a carrier used in the carrier fluidized biological filtration tank according to claim 3, wherein the carrier used in the carrier fluidized biological filtration vessel has a specific gravity slightly higher than that of water, and a swirl carrier that swirls and flows by aeration. And a carrier for a filtration part constituting a filtration part which is settled and settled down. The method for using the carrier used in the carrier fluidized biological filtration tank according to claim 4 is the method according to claim 3, wherein the specific gravity of the carrier for rotation is 1.01 to 1.03, and the specific gravity of the carrier for filtration is 1.04 to 1.04. 1.06.

According to the first aspect of the present invention, since the swirling carrier always moves in a swirling flow due to the diffused air, and the carrier for the filtering unit always constitutes the filtering unit, the carrier for the swirling and the carrier for the filtering unit are charged. According to the amount, the filtration part can be formed promptly with the desired amount of the carrier, and the desired amount of the carrier can be swirled immediately. Therefore, stable sewage treatment can be efficiently performed. According to the invention of claim 2, since the sewage and the carrier are fluidized and swirled in the flow chamber of the carrier fluidized biological filtration tank to purify the sewage, and then the biological filtration is performed in the biological filtration chamber, it is possible to obtain good water quality. Can be.
According to the third aspect of the present invention, the swirling carrier always moves in a swirling flow due to the air diffusion, and the carrier for the filtering unit always constitutes the filtering unit. Therefore, according to the input amounts of the carrier for the swirling and the carrier for the filtering unit. As a result, the filtration section can be quickly formed with a desired amount of the carrier, and the desired amount of the carrier can be quickly swirled and flown. Therefore, stable sewage treatment can be efficiently performed. According to the invention of claim 4, since the specific gravity of the carrier for swirling and the carrier for constituting the filtration unit is suitable,
The filtration part can be quickly formed with a desired amount of the carrier, and the desired amount of the carrier can be quickly swirled and flown. Therefore, stable sewage treatment is efficiently performed.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a carrier-flowing biological filtration tank 1 of the present embodiment. As shown in the figure, the carrier fluidized biological filtration tank 1 of the present embodiment has an opening at the top of the tank body b and is covered with a lid, a manhole, or the like. Further, the tank body b is provided with an inflow port 9 and a discharge port 23, and further, in the tank body b, a flow chamber 12, a biological filtration chamber 13, a treated water chamber 14, and a disinfection chamber 15 are provided. Reference numeral 16 denotes a partition plate.

The aeration diffuser 17 is located near the lower end of the flow chamber 12 to generate a swirling flow efficiently, and is connected to a blower 22 by a pipe 20. The back-flushing diffuser tube 18 is located in the biological filtration chamber 13, and the stationary carrier in the biological filtration chamber 13 is floated and swirled into the flow chamber 12 by aeration to wash the carrier. . The back-wash air diffuser 18 is connected to a blower 22 by a pipe 21. The blower 22 has two discharge ports, one for aeration and the other for backwashing. An automatic valve is provided inside the blower 22, and the automatic valve is operated by a controller provided separately, so that the air can be arbitrarily blown for aeration or back washing.

Further, details of the carrier fluidized biological filtration tank 1 of the present embodiment will be described. Two kinds of different gel carriers, that is, a carrier 2 for swirling and a carrier 3 for constituting a filtration unit, are loaded into the wastewater in the tank body b as carriers. The flow chamber 12 of the tank body b
In order to be able to turn easily, it is formed in a substantially rectangular parallelepiped, and a predetermined amount of the turning carrier 2 is charged. At the lower end of the flow chamber 12, that is, at the bottom of the tank body b, a biological filtration chamber 13 is provided. The biological filtration chamber 13 is formed as a stationary part so as not to be affected by the swirling flow of the flow chamber 12. In this case, the carrier 3 for forming a filtration section is retained by a specific gravity difference that is slightly heavier than water, and functions as a biological filtration section.

[0010] The carrier 2 for swirling and the carrier 3 for constituting the filtration unit
Is slightly heavier than water, but the biological filtration chamber 13
Thus, two different types of gel carriers are used because the filtration section is surely configured and the swirling flow is surely performed in the flow chamber 12. In other words, one kind of the carrier 2 for swirling uses a material having a specific gravity close to that of water, and if it is mainly used for flowing, the swirling is performed well, so that the flow efficiency is improved. Another type of the carrier for the carrier filtration unit 3 is one that is heavier than water and is intended to reliably constitute the filtration unit in the biological filtration chamber 13. That is, in the filtration section of the biological filtration chamber 13, filtration resistance is generated due to filtration, and the carrier tends to be washed away. Therefore, when a carrier having a high specific gravity is used so as to overcome these resistance forces, it is effective to use the carrier. A biological filtration unit can be configured. Further, as the carrier 2 for swirling and the carrier 3 for constituting the filtration unit, a polyvinyl alcohol gel having a large specific surface area, having a void on the carrier surface and in the carrier,
By using a gel carrier such as polyethylene glycol gel, the purification efficiency by carrying microorganisms can be further enhanced.

The carrier 2 for swirling and the carrier 3 for constituting the filtration section need only satisfy the following conditions. That is, the turning carrier 2 may be any carrier that has a specific gravity slightly higher than that of water and that swirls and flows due to aeration. The carrier 3 for forming the filtration unit may be any carrier that is larger than the specific gravity of the carrier 2 for swirling and constitutes a filtration unit by being settled down. If the swirling carrier 2 and the filtering unit constituting carrier 3 satisfying these conditions are used, the swirling carrier 2 always moves in a swirling flow due to the air diffusion, and the filtering unit constituting carrier 3 always constitutes the filtering unit. For this reason, it is possible to quickly form the filtration unit with a desired amount of the carrier according to the input amounts of the carrier 2 for swirling and the carrier 3 for constituting the filtering unit, and to quickly swirl and flow the desired amount of the carrier. Can be. Therefore, there is an effect that stable sewage treatment can be efficiently performed.

The carrier 2 for swirling and the carrier 3 for constituting the filtration section
Is sufficient if the above conditions are satisfied, but further effects can be obtained by using the specific gravity shown in FIG. FIG. 2 shows a carrier 2 for swirling and a carrier 3 for constituting a filtration unit.
4 is a table showing the materials and specific gravities. As shown in the figure, the specific gravity of the turning carrier 2 is preferably 1.01 to 1.03. If the specific gravity of the circling carrier 2 is less than 1.01, it will rise,
If it goes over, it may settle down naturally. For this reason, the specific gravity of the swirling carrier 2 is preferably 1.01 to 1.03. In this case, there is an additional effect that the swirling flow is always performed by aeration without standing and settling to form a filtration unit. The material of the turning carrier 2 may be polyvinyl alcohol or polyethylene glycol, and is not particularly limited.

The specific gravity of the carrier 3 for constituting the filtration section is 1.04 to 1.06.
Is preferred. If the specific gravity of the carrier 3 for the filtration part is less than 1.04, it becomes difficult to stand the carrier due to filtration resistance, and if it exceeds 1.06, the carrier becomes too heavy and the carrier may not flow at the time of backwashing. For this reason, the specific gravity of the carrier 3 for constituting the filtration unit is
1.04 to 1.06 is preferable. In this case, the carrier can be quickly swirled and flowed by aeration, and the carrier in the filtration unit can be quickly settled and settled. The material of the carrier 3 for forming the filtration unit may be polyvinyl alcohol or polyethylene glycol, and is not particularly limited.

Next, the operation and effect of the carrier fluidized biological filtration tank 1 of the present embodiment will be described. According to the carrier-flowing biological filtration tank 1 of the present embodiment, the swirling carrier 2 always moves in a swirling flow due to the diffused air, and the filtering unit constituting carrier 3 always forms the filtering unit. For this reason, the carrier 2 for swirling and the carrier 3 for constituting the filtration section
The filtration section can be formed promptly with a desired amount of the carrier, and the desired amount of the carrier can be quickly swirled and flown according to the input amount of the carrier. Therefore, there is an effect that stable sewage treatment can be efficiently performed.

In addition, the fluidizing section 1 of the carrier fluidized biological filtration tank 1
Since the sewage and the carrier are fluidized and swirled in 2 to purify the sewage, and then the biological filtration is performed in the biological filtration chamber 13, it is possible to obtain an effect of obtaining good water quality.

[0016]

According to the first aspect of the present invention, the swirling carrier always moves in a swirling flow due to the diffused air, and the carrier for the filtering unit always constitutes the filtering unit. The filtration section can be formed promptly with a desired amount of the carrier, and the desired amount of the carrier can be quickly swirled and flown according to the input amount of the carrier. Therefore, stable sewage treatment can be efficiently performed. According to the invention of claim 2, since the sewage and the carrier are fluidized and swirled in the flow chamber of the carrier fluidized biological filtration tank to purify the sewage, and then the biological filtration is performed in the biological filtration chamber, it is possible to obtain good water quality. Can be. According to the third aspect of the present invention, the swirling carrier always moves in a swirling flow due to the air diffusion, and the carrier for the filtering unit always constitutes the filtering unit. Therefore, according to the input amounts of the carrier for the swirling and the carrier for the filtering unit. As a result, the filtration section can be quickly formed with a desired amount of the carrier, and the desired amount of the carrier can be quickly swirled and flown. Therefore, stable sewage treatment can be efficiently performed. According to the invention of claim 4, since the specific gravity of the carrier for turning and the carrier for constituting the filtering portion is suitable, the filtering portion can be formed promptly with the desired amount of carrier, and the desired amount of carrier can be quickly turned. Can be fluidized. Therefore, stable sewage treatment is efficiently performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a carrier flowing biological filtration tank 1 of the present embodiment.

FIG. 2 is a table showing materials and specific gravities of a carrier 2 for swirling and a carrier 3 for constituting a filtration unit.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 carrier fluid biological filtration tank 2 carrier for swirling 3 carrier for filtration unit configuration 12 flow chamber 13 biological filtration chamber

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Claims (4)

[Claims] A carrier introduced into sewage in a tank has a specific gravity slightly higher than that of water and a swirling carrier that swirls and flows due to aeration, and a specific gravity greater than the swirling carrier. A carrier-flowing biological filtration tank, comprising: a carrier for a filtration part constituting a part. 2. The carrier-flowing biological filtration tank has a flow chamber provided at an upper portion of the vessel and a biological filtration chamber provided at a bottom of the vessel, and the biological filtration chamber is provided with a swirl flow generated in the fluid chamber. The carrier-flowing biological filtration tank according to claim 1, wherein the tank is formed in a stationary part that is not affected. 3. A carrier used in a carrier-flowing biological filtration tank,
It is characterized by using a carrier for swirling, which has a specific gravity slightly higher than that of water and swirls and flows due to diffused air, and a carrier for forming a filtration unit, which has a larger specific gravity than the carrier for swirling and which is settled down to form a filtration unit. A method for using a carrier used in a carrier fluidized biological filtration tank. 4. The carrier for biological fluid filtration according to claim 3, wherein the specific gravity of the carrier for swirling is 1.01 to 1.03, and the specific gravity of the carrier for filtration is 1.04 to 1.06. How to use the carrier.