JPH06320185A - Aeration device - Google Patents

Abstract

PURPOSE:To provide an aeration device which can uniformize the amt. of air supplied from each air feed pipe to perform a uniform aerating operation. CONSTITUTION:An aeration amt. controller 100 is provided with a valve member 17 freely movable between a lower and an upper position of an outer cylinder 10 and the valve member is provided integrally with a lower float 18 which gradually decreases the space between itself and the outer cylinder 10 as it moves downward and an upper float 19 which gradually decreases the space between itself and the outer cylinder 10 as it moves upward. When the amt. of air supplied from air feed pipe is increased, the valve member 17 is entirely moved upward to decrease the space between its upper float 19 and the outer cylinder 10, thereby holding down an increase in the overall amt. of air flow in the aeration amt. controller 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to treated water stored in a water tank, various aeration tanks in a water treatment apparatus, an aeration apparatus which can be utilized for water quality conservation in natural water areas such as ponds, lakes and marshes.

[0002]

2. Description of the Related Art Conventionally, microbial treatment of organic wastewater (for example, activated sludge treatment method, contact aeration method), prevention of anaerobic treatment of organic wastewater or sludge treatment tank, water quality improvement of landscape ponds, lakes and moats. In the fluidized bed method in which water containing bioparticles is circulated, aeration devices 50 to 52 for blowing air into the treated water in the treatment tank are used.

The aeration device 50, as shown in FIG.
The diffusing towers 3 are horizontally arranged in a row along the vicinity of the lower part of one wall surface 2 of the treatment tank 1, and an air supply pipe 4 for supplying air to each of these diffusing towers 3 is connected to the air. A control valve 5 for controlling the supply amount of air is provided in the middle of the supply pipe 4, and air is supplied to each of these air supply pipes 4 from a common blower 6 through a branch portion. It is like this. The aeration device 50 of FIG.
Indicates the activated sludge method by the one-sided swirling flow method or the contact aeration method. Also, in the following description, common components will be assigned the same reference numerals.

The aeration device 51, as shown in FIG.
A large number of air diffusion towers 3 are arranged in a matrix in a horizontal plane near the bottom of the treatment tank 1, and air supply pipes 4 for supplying air to each of these air diffusion towers 3 are connected to these air supply pipes. Similar to the aeration device 50 described above, control valves 5 for controlling the supply amount of air are provided in the middle of 4, respectively, and each of these air supply pipes 4 has a common blower through a branch portion. Air is supplied from 6. In addition, the aeration device 51 of FIG. 5 shows the activated sludge method by a full surface aeration method, or a contact aeration method.

The aeration device 52, as shown in FIG.
An air diffuser tower 3 is arranged in each of the plurality of divided treatment tanks 1A to 1D, and an air supply pipe 4 for supplying air to each of the air diffusion towers 3 of the respective treatment tanks 1A to 1D is connected. Similar to the aeration devices 50 and 51 described above, control valves 5 for controlling the supply amount of air are provided in the middle of the air supply pipes 4, and these air supply pipes 4 are
Air is supplied from a common blower 6 through the branch portion. In addition, the aeration device 52 of FIG. 6 is applied to, for example, a plurality of treatment tanks provided in the underground beam space of a wastewater treatment facility, sewage of a sludge storage tank, a gray water storage tank, an activated sludge treatment tank, Air is sent to the sludge storage tank and various storage tanks by the same blower 6. The aeration devices 50 to 52 shown in FIGS. 4 to 6 are provided with a control valve denoted by reference numeral 7, and the control valve 7 determines the initial flow rate at the start of aeration. (Only shown in FIGS. 4 and 5).

[0006]

By the way, FIG. 4 and FIG.
In the aeration apparatus shown in Fig. 3, even if the air supply pipes 4 connected to the air diffusing towers 3 are each provided with the control valve 5, if the aeration process is continued, dust may be attached to the air diffusing tower 3 The air supply amount of the air supply pipe 4 leading to the clogged air diffusing tower 3 may decrease and the air supply amount of the other air supply pipes 4 may decrease due to clogging or adhesion of sludge. As a result, the aeration of the processing tank 1 becomes unbalanced, resulting in a decrease in overall purification efficiency.

Further, in the aeration apparatus shown in FIG. 6, since the air is supplied from the common air source to each of the plurality of treatment tanks 1A to 1D, the water levels in the respective treatment tanks 1A to 1D are not uniform. And the water level applied to each air diffusing tower 3 becomes non-uniform. As a result, the water pressure applied to the diffusing tower 3 having the lowered water level is reduced, so that the aeration amount of the air from the diffusing tower 3 is increased as compared with the other diffusing towers 3. As a result, the other aeration tower 3 has a problem that the aeration amount of air is reduced.

When the amount of aeration in the treatment tank becomes non-uniform as described above, some activated sludge is deposited and decomposed (activated sludge treatment method), and the flow in the tank becomes uneven, which causes a local problem. Occurrence of clogging (contact aeration method), local deposition of bioparticles (fluidized bed method), anaerobicization, solid matter deposition (in the case of organic wastewater and sludge storage tank), uneven oxygen concentration As a result, there are problems that the purification efficiency is lowered, and rotting and odor are generated.

The present invention has been made in view of the above circumstances, and when air sent from a common air source is supplied to each of a plurality of branched air supply pipes, each air supply is performed. An object of the present invention is to provide an aerator capable of uniformizing the supply amount of air to the pipe and performing uniform aeration in the treatment tank.

[0010]

In order to achieve the above object, in the present invention, the aeration fluid sent from a common blower is divided into a plurality of supply pipes, and the flow rate of the aeration fluid is in the middle of each supply pipe. In the aerating device in which the aeration amount controller for adjusting the aeration amount is provided in the vertical direction, the aeration amount controller is provided with a tubular body through which the aeration fluid flows, and in the axial direction of the tubular body that is arranged in the tubular body. A valve member movably provided along the tubular member, the valve member being movable between a lower position and an upper position of the tubular body, The lower float, which gradually reduces the distance, and the upper float, which gradually decreases the distance between the cylindrical body as it moves upward, are integrated.

[0011]

According to the present invention, in the middle of each of the plurality of divided supply pipes, a tubular body through which the aeration fluid flows, and a tubular body which is disposed in the tubular body and is movable along the axial direction of the tubular body. An aeration amount controller consisting of a valve member provided on the cylindrical body is provided, and the valve member of the aeration amount controller is movably provided between a lower position and an upper position of the tubular body, and is moved downward. A lower float that gradually reduces the interval with the tubular body as it moves,
Since the upper float that gradually reduces the distance from the tubular body along with the upward movement is integrated, the supply pressure of the aeration fluid flowing from the lower side to the upper side of the supply pipe, the weight of the valve member, etc. The lower float of the valve member stays in a vertically balanced position.

At this time, for example, when a certain supply pipe is clogged with dust, the flow rate of the aeration fluid is decreased in the clogged supply pipe, and relatively other Will increase the flow rate of the aeration fluid in the supply pipe. Then, when the flow rate of the aeration fluid in the supply pipe increases in this way, in the aeration amount controller provided with the supply pipe, the valve member is generally moved upward due to the increase in the aeration fluid amount. Further, when the valve member moves upward by a certain amount, the interval between the upper float of the valve member and the cylindrical body is reduced, which causes the flow rate of the entire aeration amount controller to be small. It can be suppressed only by increasing the amount. That is, in the aeration apparatus of the present invention, even when the aeration fluid flow rate of the supply pipe is relatively increased due to the influence of other systems, the aeration amount controller provided in the supply pipe aerates the aeration. The increase of the fluid is suppressed to a minute amount, so that the amount of the aeration fluid flowing in each supply pipe does not vary.

[0013]

Embodiments of the present invention will be described below with reference to FIGS. Note that the aeration amount controller 1 shown in this embodiment is
00 and 101 are provided instead of the control valve 5 shown in FIGS. 4 to 6, and are arranged vertically along the air supply pipe 4.

First, referring to FIG. 1, an aeration amount controller 100 according to a first embodiment will be described. In this figure, the reference numeral 10 is an outer cylinder, and the outer cylinder 10 is
A lower taper pipe 10a provided on the lower side about 1/3 and having a diameter gradually increasing upward, a cylindrical pipe 10b having the same diameter on the middle portion, and about 1/4 to 1/3 on the upper side. The upper taper pipe 10c, which is provided in the
It consists of and. In addition, the upper end of the outer cylinder 10,
Mounting flanges 11 and 12 for connecting to the above-described air supply pipe 4 are provided at the lower end portion, and the center shaft supports 14 and 15 are provided in the air flow passage 13 in the outer cylinder 10.
The center shaft 16 fixed by is arranged along the center line.

A valve member 17 is provided in the air flow passage 13 of the outer cylinder 10 so as to penetrate the center shaft 16 and to be movable along the center shaft 16. The valve member 17 is composed of a lower float 18 provided on the lower side, an upper float 19 provided on the upper side, and a tie rod 20 connecting the floats 18 and 19 to each other. 1
8 is within a range between a lower position where downward movement is restricted by the taper of the lower tapered pipe 10a and an upper float 19 is between upper position where upward movement is restricted by the taper of the upper tapered pipe 10c. It is designed to be moved vertically.

With this structure, the valve member 1
When the valve member 17 moves downward, the lower float 18 moves the lower taper pipe 1 as the valve member 17 moves downward.
The lower float 1 close to the tapered wall of 0a
8 and the lower taper pipe 10a are gradually reduced, and when the valve member 17 moves upward, as the valve member 17 moves upward, the upper float 19 Is close to the tapered wall surface of the upper taper pipe 10c, and the upper float 19 and the upper taper pipe 10c are
The gap formed between and is gradually reduced. That is, the tapered wall surfaces respectively located on the inner surface sides of the lower taper pipe 10 a and the upper taper pipe 10 c function as valve seats of the lower float 18 and the upper float 19 of the valve member 17.

Next, the operation of the aeration amount controller 100 configured as described above will be described. Since the lower taper pipe 10a of the outer cylinder 10 is provided so as to expand upward, the valve member 1 is opened by the air flowing upward from below.
7 stops at the position where the lower float 18 is balanced. The position of the lower float 18 is determined by the supply pressure of the blower 6 that blows air, the state of the air flow, the weight of the valve member 17, and the like.

In the aeration amount controller 100 provided for each of the air supply pipes 4 as described above, for example, when clogging due to dust occurs in a diffuser 3 (FIGS. 4 and 5).
In the example), the air flow rate in the air supply pipe 4 in which such a situation occurs decreases, and the air flow rate in the other air supply pipe 4 relatively increases. Further, in the example of FIG. 6, when the water level in each of the processing tanks 1A to 1D fluctuates and the water surface of a certain processing tank 1A to 1D lowers, such a situation occurs. The air flow rate in the air supply pipe 4 increases, and the air flow rate in the other air supply pipe 4 relatively decreases.

When the air flow rate of the air supply pipe 4 is increased in this way, the valve member 17 is entirely moved upward by the increased air pressure, and the valve member 17 is further moved upward. When the fixed amount is moved to a certain amount, the distance between the upper float 19 of the valve member 17 and the upper taper pipe 10c of the outer cylinder 10 is reduced, so that the flow rate of the entire aeration amount controller 100 is very small. It can be suppressed only by increasing the amount. That is, in this aeration amount controller 100,
Even when the air flow rate is relatively increased due to the influence of other systems, the increase of the air is suppressed to a very small amount, so that the amount of air flowing through each air supply pipe 4 does not vary, Uniform aeration can be performed in the treated tank 1 or 1A to 1D.

Next, a second embodiment of the present invention will be described with reference to FIG. The difference between the aeration amount controller 101 of the second embodiment and the aeration amount controller 100 of the first embodiment is that
In the structure of the valve member and the outer cylinder corresponding to the valve member. That is, the valve member 21 of the second embodiment includes the lower float 22 provided on the lower side and the intermediate float 2 provided on the intermediate portion.
3 and the upper float 24 provided on the upper side, and the floats 22 to 24 are connected to each other.
3 and a tie rod 25 that rotatably supports 3.

Further, the outer cylinder 10 has a lower taper pipe 10a whose diameter gradually increases upward, an intermediate pipe 10d provided in an intermediate portion, and an upper taper pipe 10c whose diameter gradually decreases upward. And an intermediate tube 1
0d is formed in a shape in which the upper side corresponding to the intermediate float 23 of the valve member 21 gradually increases in diameter upward. In the valve member 21 configured as described above, the lower float 22 and the intermediate float 23 are
0a, the lower position of the intermediate pipe 10d is restricted by the taper of the intermediate pipe 10d, and the upper float 24 between the upper position where the upward movement of the upper taper pipe 10c is restricted by the taper of the upper taper pipe 10c. It is supposed to be moved to.

Further, the lower float 22 and the intermediate float 2
In FIG. 3, facets 22A and 23A are formed in the bulge portion that is a part that protrudes to the outside.
When air is sent to the air flow passage 13 by A and 23A, the lower float 22 and the intermediate float 23 are forcibly rotated at high speed, whereby the valve member 21 is moved to the outer cylinder 1.
It is located at the center of 0. That is,
As shown in FIG. 1, the valve member 21 is in a state in which it can be freely moved in the horizontal direction without being guided by the center shaft 16 in the outer cylinder 10, but the lower float 22 and the intermediate float of the valve member 21. 23 is a facet 22A, 23
Since the valve member 21 is rotated at a high speed by A, the valve member 21 is located at the center of the outer cylinder 10 without being closer to the outer cylinder 10 side.

In this way, in the system of the second embodiment in which the whole of the valve member 21 is located in the central portion of the outer cylinder 10 by rotating the lower float 22 and the intermediate float 23 in this way, the valve of the first embodiment is used. Unlike the member 17, the friction between the valve member 17 and the center shaft 16 does not affect, so that the vertical movement of the valve member 21 at the time of adjusting the flow rate can be performed without hindrance.

Although air is supplied by the common blower 6 in the above embodiment, the common blower 6 is used.
The number is not limited to one, but two or more may be provided as shown in FIG. In addition, in each of the aeration amount controllers 100 and 101 shown in the above embodiment, the tie rod 2
By appropriately changing the lengths of 0 and 25, the width of flow rate adjustment can be set arbitrarily.

[0025]

As is apparent from the above description, in the aeration apparatus of the present invention, even if the air flow rate of the supply pipe is relatively increased, the aeration amount controller provided in the supply pipe , The increase in air is suppressed to a very small amount, so that there is no variation in the amount of air flowing through each supply pipe, and it is possible to perform even aeration of the processing liquid stored in the processing tank. It is possible to prevent deterioration of purification efficiency, deterioration, and odor.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an aeration amount controller 100 of a first embodiment, (a) is a front sectional view thereof, and (b) is a plan view of a center shaft support 15 (14).

FIG. 2 is a front sectional view showing an aeration amount controller 101 of a second embodiment.

FIG. 3 is a piping diagram when one or two common blowers are provided.

FIG. 4A is a plan view showing a conventional aeration amount control device 50, and FIG. 4B is a side view of FIG.

FIG. 5 is a plan view showing a conventional aeration amount adjusting device 51.

FIG. 6 is a plan view showing a conventional aeration amount adjusting device 52.

[Explanation of symbols]

 1 treatment tank 4 air supply pipe 6 blower 10 outer cylinder (cylindrical body) 13 air flow passage 17 valve member 18 lower float 19 upper float 21 valve member 22 lower float 24 upper float 100 aeration amount controller 101 aeration amount controller

Claims (1)

[Claims] 1. An aerator in which aeration fluid sent from a common blower is divided into a plurality of supply pipes, and the flow rate of the aeration fluid is adjusted by an aeration amount controller in the middle of each supply pipe, The aeration amount controller has a tubular body through which the aeration fluid flows, and a valve member disposed in the tubular body and movably provided along an axial direction of the tubular body, the valve member Is movable between a lower position and an upper position of the tubular body, and has a lower float that gradually reduces the interval between the tubular body and the tubular body as it moves downward and a tubular shape that moves upward. An aerator characterized by being integrally provided with an upper float that gradually reduces the distance from the body.