JPH1024299A - Aerobic treatment of organic sewage and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating org. sewage with the aerobic decomposition capacity enhanced by practically eliminating the wear of a carrier, charging the whole amt. of the necessary carrier at the start of operation, incubating a microorganism in the carrier bed while passing water through the device and repeatedly passing the water through the carrier bed. SOLUTION: Org. sewage is introduced into an aerobic treating tank 1. A reticular body 2 for blocking the passage of a carrier 3 is horizontally fitted in the tank 1 in a single stage or in multiple stages to vertically divide the inside of the tank 1 into several compartments. The floatable microorganism immobilizing carrier 3 is packed in each compartment, the water to be treated is passed through the carrier 3 bed in each compartment, air is diffused by a blower 5 from the bottom of the tank 1, the water is circulated in the tank 1 by a circulating pump 7, and the water is purified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating organic sewage such as sewage, which is highly biologically purified by a very rational treatment method and apparatus.

[0002]

2. Description of the Related Art Conventionally, a granular material comprising an organic polymer compound has been used as a carrier for immobilizing microorganisms (hereinafter referred to as a carrier). To purify sewage, a carrier having an amount corresponding to 5 to 70% of the volume in a treatment tank is required. It is immersed and charged, diffuses and circulates in the treatment tank, and the carrier is freely moved to make contact with the water to be treated.

[0003]

In the case of purifying organic wastewater with a conventional fluidized bed, a large power is required to circulate the carrier together with the water to be treated, and the carrier rubs against the wall of the treatment tank during the circulation. There was a problem that wear was severe and durability was lacking. In addition, at the initial stage of loading of the carrier, there is no growth of microorganisms, the specific gravity is small, the surface floats near the water surface, and no swirling occurs. In addition, the input amount of the carrier correlates with the growth of
In order to input the%, it is necessary to perform an input operation in small amounts of about six months, which is troublesome, and the processing capacity is limited during this time.

[0004] In view of the above, the present invention is characterized in that there is almost no wear of the carrier, the entire amount of the carrier required at the start of the operation is charged, and the microorganisms are cultivated in the carrier layer and the water is repeatedly passed through the carrier layer while running the water. Accordingly, it is an object of the present invention to provide a method and an apparatus for treating organic sewage, in which aerobic decomposition capacity can be promptly exerted.

[0005]

According to the present invention, there is provided a method for introducing organic wastewater into an aerobic treatment tank, wherein a network for preventing the carrier from passing through the tank is provided in a single stage or in multiple stages. Horizontally laid horizontally, the inside of the tank is divided into several chambers in the vertical direction, each chamber is filled with a buoyant microorganism-immobilized carrier, and the water to be treated passes through the carrier layer in each chamber, and at the same time the bottom of the tank. It is characterized by performing more aeration and purifying by circulating the water to be treated in the tank.

In the method of the present invention, the organic wastewater is introduced laterally into aerobic treatment tanks divided into several tanks, and a mesh for preventing the passage of carriers is provided in each tank in a single stage or in multiple stages. Horizontally, each tank is divided into several chambers in the vertical direction, each chamber is filled with a buoyant microorganism-immobilized carrier, and water to be treated is passed through the carrier layer of each chamber at the same time. It is characterized in that air is diffused from the bottom of the tank, the water to be treated is circulated in each tank, and the water to be treated is sequentially transferred from the foremost tank to the last tank to perform a purification treatment. In the method of the present invention, part of the water to be treated is returned from the last tank of the aerobic treatment tank to the forefront tank in the aerobic treatment method for organic wastewater according to claim 2, and the purification treatment is repeated. It is characterized by the following.

In the method of the present invention, the organic wastewater is introduced into an aerobic treatment tank divided into several tanks in a horizontal direction, and a mesh body for preventing passage of a carrier is provided in each tank in a single stage or in multiple stages. Horizontally laid horizontally, each tank is divided into several chambers in the vertical direction, each chamber is filled with a buoyant microorganism-immobilized carrier, and water to be treated passes through the carrier layer of each chamber, and each tank is simultaneously filled. Aeration from the bottom of the tank, sequentially transfer the water to be treated from the foremost tank to the last tank, return a portion of the to-be-treated water from the last tank to the forefront tank, and repeat the purification process. It is characterized by the following.

In the apparatus of the present invention, the inside of the aerobic treatment tank is divided into several chambers in a vertical direction by a net-like body that blocks the passage of carriers horizontally arranged in a single stage or in multiple stages. A microorganism-immobilized carrier having the same is filled, an air diffuser is installed at the bottom of the tank, and a circulating device for circulating the water to be treated in the tank is installed in the tank. is there.

In the apparatus of the present invention, the aerobic treatment tank is divided into several tanks in a horizontal direction by a partition wall, and the inside of each tank is a net-like body for preventing passage of a carrier horizontally laid in a single stage or in multiple stages. The chamber is vertically divided into several chambers, each chamber is filled with a buoyant microorganism-immobilizing carrier, an air diffuser is installed at the bottom of each tank, and each tank is treated in each tank. A circulating device for circulating water is provided, and the partition wall is provided with an advancing section for the water to be treated to a subsequent tank.
Further, the apparatus of the present invention returns a part of the water to be treated in the last tank to the last tank of the aerobic treatment tank of the aerobic treatment apparatus for organic wastewater according to claim 6 to the front tank. A return means is provided.

[0010] In the apparatus of the present invention, the aerobic treatment tank may be divided into several tanks by a partition wall in a horizontal direction, and the inside of each tank may be a single-stage or multi-stage horizontally-arranged carrier for preventing passage of carriers. The chamber is vertically divided into several chambers, and each chamber is filled with a buoyant microorganism-immobilizing carrier, and a diffuser is installed at the bottom of each tank, and the partition wall is connected to a subsequent tank. An advection section for the water to be treated is provided, and a return means for returning a part of the water to be treated to the frontmost tank is provided in the last tank.

According to the first and fifth aspects of the present invention, since the carrier in the aerobic treatment tank is divided by a mesh for preventing passage of the carrier, a carrier layer is formed in each chamber. The carrier is in a floating state, but does not move in the upper and lower mesh sections. Further, since the water to be treated circulates in the tank, it passes through the carrier layer that aerobically decomposes organic impurities several times, so that the number of times of contact of microorganisms inside and outside the carrier increases, and purification is promoted. The mesh and the carrier are prevented from being clogged by aeration and the flow of the water to be treated.

Further, the present invention according to claims 2 and 6 is used for a large aerobic treatment tank or the like which requires a large processing capacity, and the aerobic treatment tank is divided into several tanks in a lateral direction. The inside of each partitioned tank has the same function as that of the first and fifth aspects of the present invention, and the water to be treated is sequentially transferred from the foremost tank to the last tank so that the microorganisms in the carrier layer are transferred. The number of contacts is increased to increase the processing capacity.

The present invention according to claims 3 and 7 has the same function as the inventions according to claims 2 and 6, but when the aerobic treatment tank is divided into several tanks, the circulation is performed in each tank. After the water to be treated is circulated in the last tank, a part of the water to be treated is returned to the foremost tank and subjected to repeated purification treatment, so that aerobic decomposition can be performed more efficiently. it can.

Further, in the present invention according to claims 4 and 8, the carrier in the aerobic treatment tank is divided by a mesh that blocks the passage of the carrier, so that a carrier layer is formed in each chamber, and the carrier is It is in a floating state but within the upper and lower mesh sections and does not move.
Similarly, the mesh body and the carrier are prevented from being clogged by aeration and flow of the water to be treated, but after passing through the carrier layer that aerobicly decomposes the organic impurities in each tank, the final portion of the material to be treated is treated. Since a part of the water is returned to the forefront tank again and repeatedly subjected to the purification treatment, aerobic decomposition can be performed efficiently as in the case of circulating the water to be treated in each tank.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the first and fifth aspects of the present invention, FIG. 2 is a block diagram showing one embodiment of the second and third aspects of the present invention, and FIGS. FIG. 7 is a configuration diagram showing one embodiment of the inventions of claims 4 and 8.

In FIG. 1, reference numeral 1 denotes an aerobic treatment tank, and a net 2 is horizontally disposed in the aerobic treatment tank 1 so that an upper chamber 1A, a central chamber 1B, and a lower chamber 1 1C. Although it is divided into three stages in the drawing, it can be divided into a single-stage or a multi-stage room.

Upper chamber 1A, central chamber 1B and lower chamber 1C
Inside, a carrier layer is formed, which is slowly filled with a large number of buoyant carriers 3 carrying aerobic microorganisms that aerobically decompose organic impurities contained in the water to be treated. The mesh of the mesh body 2 is formed in a size that prevents the passage of the carrier 3, and the carrier 3 does not exit from the room.

The material of the carrier 3 is not particularly limited as long as it is a particulate material having a floating property. Known materials such as a foamed or processed product of an organic polymer compound can be used. Are preferable, and urethane resin is particularly preferable. For example, an elastic porous granular material such as a flexible polyurethane foam in which a polymer chain of a polyol as a main raw material is formed of an ether bond is produced by foaming a plastic such as a urethane resin by a foaming method for forming open cells to obtain a desired shape. Cut to size and use. Its size is 10 to 30 mm, and its shape can be square, spherical or various other shapes, but square is preferred. If an ether-based flexible polyurethane foam is used, it is resistant to hydrolysis and has sufficient durability.In addition, since the pores on the inner surface and the outer surface communicate with each other, microorganisms enter the inside of the carrier, so that cultivation is easy, and Microorganisms do not exfoliate due to treated water or air flow.

Reference numeral 4 denotes an air diffuser provided at the bottom of the aerobic treatment tank 1, and air or pure oxygen is supplied into the tank from a blower 5 provided outside the aerobic treatment tank 1 via an air supply pipe 6. 4, a blower 5, and an air pipe 6 constitute an air diffuser. Reference numeral 7 denotes a circulation pump provided at the bottom of the aerobic treatment tank 1. A circulation pipe 8 is connected to the circulation pump 7, and the tip of the circulation pipe 8 projects above the water surface and is bent downward, so that the water to be treated is supplied into the tank. The circulating device that can circulate is constituted. 9 is a sewage supply pipe, 10
Reference numeral denotes a sedimentation tank following the aerobic treatment tank 1, and a partition wall 11.
Of the aerobic treated water from the aerobic treatment tank 1 at the bottom of
Is provided. Reference numeral 13 denotes a drainage pipe of the treated water provided in the sedimentation tank 10.

Next, in FIG. 2, portions corresponding to those in FIG. 1 are denoted by the same reference numerals. In the drawing, the aerobic treatment tank 1 is divided into three tanks in the horizontal direction, but it can be divided into an arbitrary number of tanks depending on the installation scale. Each partitioned tank has a structure including a carrier 3 layer made of a mesh body 2 similar to the aerobic treatment tank 1, a circulation pump 7, an air diffuser 4, a blower 5, and an air diffuser including an air pipe 6. A circulating pipe 8 connected to a circulating pump 7 provided at the bottom of the last tank is provided with a return pipe 14 for branching and returning to the upper part of the foremost tank. Part can be returned to the upper part in the forefront tank.

In the drawing, the circulation pump 7 and the circulation pipe 8 in the last tank share the circulation pump for return and the return pipe 14, but they can of course be installed separately.
Reference numeral 15 denotes a valve provided in the circulation pipe 8 and the return pipe 13 of the last tank. A partition wall 16 is provided at the boundary of each tank.
In the center of the tank, there is provided a flow path 17 of the water to be treated, which is partitioned on all sides by walls. A vertically extending upwardly extending chimney-shaped advection section having an opening 19 is formed, and the water to be treated to each tank flows downward. The advection section is not limited to such a configuration, and the overflow water may simply flow from above the partition wall of each tank.

The boundary between the last tank and the sedimentation chamber 10 is the same as before in that the advection port 12 is formed at the bottom of the partition wall 11.

Next, in FIG. 3, portions corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals. In the drawing, the aerobic treatment tank 1 is divided into three tanks in the horizontal direction, but it can be divided into an arbitrary number of tanks depending on the installation scale. Each partitioned tank has a carrier 3 layer made of the same net 2 as the aerobic treatment tank 1 and an air diffuser including an air diffuser 4, a blower 5, and an air blower 6, and a circulation device is installed in each tank. It has not been. Then, a return means including a circulation pump 7 and a return pipe 20 for returning a part of the water to be treated to the frontmost tank is provided in the last tank. An advection section similar to that shown in FIG. 2 is formed at the boundary between the tanks.

[0024]

According to the present invention, although the carrier is in a floating state, the carrier is in the upper and lower meshes, and only the water to be treated passes between the carriers, so that the carrier is not worn due to circulating flow, and the carrier is durable. Has the property. Since the carrier is divided into multiple stages of the net, the net is not damaged by the buoyancy and weight of the carrier, so that the net is safe. Also, since the carrier is not circulated, the initial loading into the aerobic treatment tank does not require acclimation even if there is no growth of microorganisms, and the amount of the carrier is 30 to 80% of the volume of the aerobic treatment tank. And the aerobic decomposition capacity can be significantly improved. Moreover, since the water to be treated repeatedly passes through the carrier layer, it can be efficiently subjected to aerobic treatment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

FIG. 3 is a configuration diagram showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aerobic treatment tank 1A Upper chamber of aerobic treatment tank 1B Central room of aerobic treatment tank 1C Lower chamber of aerobic treatment tank 2 Net-like body 3 Carrier 4 Air diffuser 5 Blower 6 Air supply pipe 7 Circulation pump 8 Circulation pipe 9 Sewage Supply pipe 10 Precipitation tank 11 Partition wall 12 Outflow port 13 Drain pipe 14 Return pipe 15 Valve 16 Partition wall 17 Flow path 18 Transfer port 19 Opening 20 Return pipe

Claims (8)

[Claims] 1. An organic wastewater is introduced into an aerobic treatment tank, and a mesh body for preventing passage of a carrier is horizontally laid in a single stage or a multistage in the tank, and the inside of the tank is vertically divided into several chambers. Separate and fill each chamber with a buoyant microorganism-immobilizing carrier, allow the water to be treated to pass through the carrier layer in each chamber, and simultaneously diffuse air from the bottom of the tank, and circulate the water to be treated in the tank. An aerobic treatment method for organic wastewater, comprising performing a purification treatment. 2. An organic wastewater is introduced laterally into aerobic treatment tanks divided into several tanks, and a mesh body for preventing passage of a carrier is horizontally provided in each tank in a single stage or in multiple stages. Each tank is vertically divided into several chambers, each chamber is filled with a buoyant microorganism-immobilized carrier, and water to be treated is passed through the carrier layer of each chamber and simultaneously scattered from the bottom of each tank. An aerobic treatment method for organic wastewater, wherein air is circulated and water to be treated is circulated in each tank, and the water to be treated is sequentially transferred from the foremost tank to the last tank for purification treatment. 3. An aerobic treatment method for organic wastewater according to claim 2, wherein a part of the water to be treated is returned to the forefront tank from the last tank of the aerobic treatment tank, and the purification treatment is repeated. The method for aerobic treatment of organic wastewater according to claim 2, characterized in that: 4. An organic wastewater is introduced laterally into an aerobic treatment tank divided into several tanks, and a mesh body for preventing passage of a carrier is horizontally laid in each tank in a single stage or in multiple stages. Each tank is vertically divided into several chambers, each chamber is filled with a floating microorganism-immobilized carrier, and the water to be treated is passed through the carrier layer of each chamber and diffused from the bottom of each tank at the same time. Organic water characterized by repeating the purification process by sequentially transferring treated water from the foremost tank to the last tank, returning a portion of the to-be-treated water from the last tank to the foremost tank, and repeating the purification process. Aerobic treatment method for sewage. 5. The aerobic treatment tank is vertically divided into several chambers in a single-stage or multi-stage net-like structure that blocks the passage of carriers horizontally disposed thereon, and immobilizes microorganisms having a floating property in each room. While the carrier is filled, an air diffuser is installed at the bottom of the tank,
An aerobic treatment device for organic sewage, wherein a circulation device for circulating water to be treated in the tank is installed in the tank. 6. An aerobic treatment tank is divided into several tanks in a horizontal direction by a partition wall, and inside each tank is a net-like body for preventing passage of a carrier horizontally laid in a single stage or in multiple stages. Each chamber is filled with a buoyant microorganism-immobilizing carrier in each chamber, a diffuser is installed at the bottom of each tank, and the water to be treated is circulated in each tank in each tank. An aerobic treatment apparatus for organic sewage, wherein an apparatus is installed and an advection section for treated water to a subsequent tank is provided on the partition wall. 7. A return for returning a part of the water to be treated in the last tank to the last tank of the aerobic treatment tank of the aerobic treatment apparatus for organic sewage according to claim 6. The aerobic treatment apparatus for organic sewage according to claim 6, wherein means is provided. 8. The aerobic treatment tank is divided into several tanks in a horizontal direction by a partition wall, and each tank has a mesh in a vertical direction by a mesh body for preventing passage of a carrier horizontally arranged in a single stage or a multistage. While being partitioned into chambers, each chamber is filled with a floating microorganism-immobilized carrier, and an air diffuser is installed at the bottom of each tank,
The partition wall is provided with an advancing section for the water to be treated to a subsequent tank, and the last tank is provided with a return means for returning a part of the water to be treated to the front tank. Aerobic treatment equipment for organic sewage.