JPH0522005U - Air supply device that is jetted in the countercurrent direction of the filter media that is installed in the sand filter device - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention is a filtration device for clarifying or reusing industrial wastewater or treated water for civil engineering work such as construction of underground walls and actual piles (hereinafter referred to as polluted raw water). , Or a sand filtration device that uses sand as a filter medium in a filtration device for dumping into rivers, the sea, etc. In addition, the present invention relates to an air supply device that ensures the flow of the filter bed filter medium in the countercurrent direction. [Constitution] The present invention relates to a sand filter device for filtering contaminated raw water using a sand filter medium, and a tank having an umbrella-shaped converging floor part which constitutes this sand filtering device, and Sand filter consisting of several air holes opened in the counter-current direction of the filter bed filter material that flows as a result of the flow, and an air supply device consisting of a compressor, a control device, etc., which are connected to these air holes via pipes. It is an air supply device that is jetted in the countercurrent direction of the filter bed filter medium installed in the device. [Effect] The fluidity of the filter bed filter medium is ensured, and agglomeration (clogging) of the filter filter medium is avoided through efficient filtration or smooth replacement of the washing filter medium and the contaminated filter medium.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a filtration device for clarifying or reusing industrial wastewater (hereinafter referred to as polluted raw water), or underground water construction, treated water for civil engineering works such as actual piles, etc. (included in polluted raw water). As a filter medium in a filtration device that clarifies or reuses or discards it into rivers, the sea, etc., and also in various polluted wastewater filtration devices such as live drainage, kitchen drainage, or sewage drainage. In a sand filter that uses sand, it ensures efficient flow in the countercurrent direction of the filter media (in other words, it includes the concept of preventing the filter media from clogging or the formation of crosslinks) for efficient The present invention relates to an air supply device that is sprayed in a countercurrent direction of a filter bed filter medium that achieves simple filtration or smooth replacement of the filter bed filter medium.

[0002]

[Prior Art]

 Conventionally, as a sand filter device for treating this kind of polluted raw water, the sand filter device shown in Fig. 3 is known (of course, not limited to the example of this figure, a device for introducing the polluted raw water from above is also possible. is there.).

In this sand filter device, a contaminated filter medium (contaminated filter medium) is conveyed through a flowing air to above a transport pipe provided in a tank, and thereafter, a cleaning device (cleaning flow path above the filter bed area). ) Will be transported to.

In this cleaning device, the washing filter medium subjected to the washing treatment is sequentially deposited above the filter bed section (in the present invention, this is a flow of the washing filter medium, which is broadly called a flow of the filter bed filter medium). ..).

As described above, the fact that the fluidity of the filter bed filter medium is ensured is a condition in which the contaminated raw water is filtered, in other words, the sand filter device is normally operating (functioning).

[0006] Therefore, in order to secure the flow of the filter bed filter medium, firstly, the contaminated filter medium at the bottom of the tank is convergently guided (flowed) to the lower part of the transport pipe, and this guiding is performed. It is indispensable to transport the contaminated filter media above the transport pipe via the transport pipe reaching the bottom of the converging bottom of the tank and the flowing air supplied to the transport pipe.

[0007]

[Problems to be solved by the device]

 However, there often occurs a situation in which reliable guide of the contaminated filter medium to the lower end opening of the transport pipe is not ensured.

The following can be considered as the factors.

(1) The sand filtering device is extremely small, but it is vertically installed (installed) in an inclined state, and flowing air is not uniformly supplied to the lower part of the transport pipe.

(2) Poor installation of (1) or uneven shape of the bottom of the agitation of the tank, and the porosity of the washed or contaminated filter material (filter bed filter material) accumulated in the filter bed area. However, it is not homogenized and a smooth flow of the washing filter material or the contaminated filter material cannot be ensured.

(3) The adherence of SS to a part of the washing filter media induces agglomeration of the contaminated filter media, failing to ensure reliable guidance to the lower end opening of the transport pipe, and smoothing of the filter bed filter media. Secure flow is not secured.

And so on.

[0013]

[Means for Solving the Problems]

 In view of this, the present invention constantly or intermittently or circulates air to the filter bed filter medium to supply (inject) air to secure the fluidity of the filter bed filter medium, prevent agglomeration, or prevent SS adhesion. The following configuration is adopted in order to achieve almost uniformization.

That is, the air supply device, which is installed in the sand filter device of the present invention and is jetted in the countercurrent direction of the filter bed filter medium, is a sand filter device that filters polluted raw water by using the sand filter medium. A tank having an umbrella-shaped converging floor that constitutes this sand filtering device and an air jet that is opened in the countercurrent direction of the converging floor of this tank and that has an intermittent method and / or order in which each filter material in the filter bed area is used. It is composed of several air holes for controlling the pressure, and a pressure adjusting means connected to the air holes via a pipe, or an air supply device including a compressor, a controller, and the like.

[0015]

[Action]

 Next, the operation of the present invention will be described. The SS of the polluted raw water introduced into the agitation bottom of the tank is removed by contact with the filter bed filter medium.

Then, the polluted raw water flows upward in the filter bed section in a countercurrent direction to the flowing filter bed filter medium, and is gradually clarified, and reaches above the filter bed section. At that point, the fining operation through the filter bed filter medium is completed.

As described above, the clarified treated water then rises toward the clarified water retention chamber formed above the tank and is sent to the outside through the clarified water pipe.

On the other hand, the filter medium, which has been contaminated at the bottom of the agglomerate by contact with the contaminated raw water, is transported in the transport pipe through the air acting as a transport medium to the cleaning device provided in the upper part of the tank.

After that, in the process of flowing down along the cleaning flow path of the cleaning device, the cleaning is performed sequentially, and further, the plate provided in the cleaning flow path or the detouring member is broken or meandered to be efficiently cleaned. It

The thus-cleaned filter medium, so-called cleaning filter medium, falls from the lower end of the cleaning channel of the cleaning device and is sequentially deposited on the upper surface of the filter medium section.

Under the above circumstances, in the present invention, based on a command from the control device, the compressor is operated via the drive device, air is blown from the air holes, and the filter bed area is not filled. Spray on the contaminated filter media at the bottom.

Through the injection of air to the contaminated filter medium, the filter bed filter medium may be agglomerated (closed or cross-linked; the same applies hereinafter) due to SS adhesion, or due to a slight design error such as standing of a tank. The tendency of agglomeration resulting from this can be avoided, and thus smooth guidance of the contaminated filter media at the bottom of the agglomeration to the lower end opening of the transport pipe can be secured.

On the other hand, the reliable and smooth transfer of the contaminated filter medium to the opening of the lower end of the transportation pipe promotes the collapse phenomenon of the filter bed filter medium at the bottom of the agglomeration, thereby providing fluidity to the filter medium in the entire filter bed area. Can be given.

Through the fluidity of the filter bed filter medium described above, efficient filtration of polluted raw water, efficient operation of the apparatus, and the like are achieved.

Note that the injection of air or the like from the air holes is performed continuously from several air holes for a predetermined time or at a variable time (injection; the same applies hereinafter), or several air holes. The control method is intermittently performed under the above-mentioned time conditions, and a predetermined condition, for example, the start or stop of the flow of the washing filter medium or the increase or decrease of the flow amount is confirmed through a sensor (not shown), and the individual control method is used. , Or a centralized management control method.

[0026]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a cylindrical tank having a convergent bottom portion 2. This tank 1 functions as a filter bed section 4 filled with a filter bed filter medium 3 for filtration, and as a clear water retention space or a sedimentation separation chamber. A clear water retention chamber 5 is formed.

The tank 1 is provided with a transportation pipe 6 that transports the contaminated filter medium 3a to a cleaning device described later.

The upper end opening 6 a of the transport pipe 6 extends outside the tank 1, and the lower end opening 6 b thereof reaches the filter bed section 4 of the agglomeration bottom 2.

An opening 6c that communicates with the cleaning flow path of the cleaning device and the cleaning drainage chamber described later is provided in the upper portion of the transport pipe 6.

The opening 6 a of the transport pipe 6 is connected to a cleaning / drainage chamber 9 having a weir 8 provided above the tank 1.

Therefore, the lower end opening 6b of the transport pipe 6 or the contaminated filter material 3a in the vicinity thereof is supplied (injected) into the transport pipe 6 through the pipe 10 to the lower end opening 6b. ) Due to the transportation action of air, it is guided to the transport pipe 6 through the lower end opening 6b, then rises in the transport pipe 6 and reaches the opening 6c provided above it.

Most of the contaminated filter material 3 a (which has been cleaned to some extent) that has reached the upper side is flowed down into the cleaning flow path 7 through the opening 6 c of the transport pipe 6, and then enters the cleaning flow path 7. At that time, it is cleaned as before.

This washed filter material 3 b is deposited above the filter bed section 4.

In the figure, 11 is a conical umbrella for diffusing the cleaning filter medium 3 b, 12 is a sewage pipe extending from the washing / drainage chamber 9, and 13 is a clarification water pipe extending from the clarification water retention chamber 5. is there.

Reference numeral 14 is an air hole formed in the convergent bottom portion 2 of the tank 1, and the opening direction of the air hole 14 is a direction (countercurrent direction) above the tank 1, that is, in the downward direction of the filter medium. It is opened in the flow direction).

The air hole 14 is supplied with air through a branch pipe 15 and / or a main pipe 16 such as a blower or a compressor 17, a drive device 18, and a control device (preferably automatic control) 19. It is connected to the device 20.

A pressure adjusting means such as a pressure tank 21 is provided in front of the blower or the compressor 17 to give a strong or weak injection pressure to the injection pressure from the air hole 14 to obtain the block shape. It is possible to effectively deal with the degree of deterioration or SS adhesion.

Therefore, as described above, a predetermined amount of air A is mainly injected to the contaminated filter medium 3a from each air hole 14 through the automatic and / or manual control of the control device 19.

[0040]

[Effect of the device]

 As described in detail above, the present invention has the following effects because it has a configuration in which several air holes that open in the countercurrent direction are provided in the bottom of the convergence of the tank.

(1) The sand filtering device is installed upright in an inclined state, or is unreasonable due to the uneven convergence angle of the bottom of the convergence, that is, the filtration of the contaminated filter material into the lower end opening of the transport pipe. Poor supply of floor filter media can be avoided.

(2) The sand filter apparatus is erected, and the accuracy and the like are facilitated.

(3) Fluidity can be imparted to the entire filter bed filter medium by injecting air to the filter bed filter medium at the bottom of the convergence.

(4) It is possible to prevent a part of SS from adhering to the filter medium or agglomeration of the filter bed filter medium such as a contaminated filter medium due to other reasons.

(5) Efficient filtration and efficient maintenance management are achieved.

(6) It is possible to control the injection of air, the fluidization of the filter media such as the contaminated filter media, and the cleaning speed through the control device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an essential part of the present invention.

FIG. 2 is a cross-sectional view showing a convergence bottom portion of the tank of FIG.

FIG. 3 is a vertical cross-sectional view showing the entire sand filter device.

[Explanation of symbols]

 1 Tank 2 Convergence Bottom 3 Filter Bed Filter Material 3a Contaminated Filter Material 3b Wash Filter Material 4 Filter Bed Area 5 Clarified Water Reservoir 6 Transport Pipe 6a Top Opening 6b Bottom Opening 6c Open 7 Wash Flow 8 Wash 9 Drain 10 Pipe 11 Umbrella 12 Pipe 13 Pipe 14 Air hole 15 Branch pipe 16 Main pipe 17 Blower or Compressor 18 Drive device 19 Control device 20 Air supply device 21 Pressure tank etc. A Air

Claims (4)

[Scope of utility model registration request] 1. A sand filter device for filtering contaminated raw water using a sand filter medium, comprising: a tank having an umbrella-shaped converging floor part which constitutes this sand filtering device; A sand filter device consisting of several air holes opened in the countercurrent direction of the filter bed filter medium and an air supply device consisting of a compressor, a control device, etc. which are connected to these air holes via pipes. An air supply device that is sprayed in the counter-current direction of the filter media that is installed. 2. The countercurrent direction of the filter bed filter medium equipped in the sand filter apparatus according to claim 1, wherein the air supply to the filter bed filter medium through the several air holes of claim 1 is controlled to be performed intermittently. Air supply device that is sprayed on. 3. The filter bed filter medium equipped in the sand filter apparatus according to claim 1, wherein air supply to the filter bed filter medium through the several air holes of claim 1 is controlled to be performed intermittently and sequentially. Air supply device that is jetted in the counter-current direction. 4. An air supply device for injecting in a countercurrent direction of a filter bed filter medium equipped in the sand filter device according to claim 1, wherein the compressor according to claim 1 is provided with pressure adjusting means.