JPH07275611A - Filtering device for waste liquid and method for washing filter medium - Google Patents

Abstract

PURPOSE:To provide a filtering device for waste liquid and a method for washing the filter medium by which the filter medium can be washed efficiently, and treatment of the drain waste liquid produced by washing can be treated easily. CONSTITUTION:A filtration tank 11 is divided into filtration chambers 13a, 13b,... which are filled with a filter medium 20. Waste liquid is recovered by pressing the filter medium 20 with a porous press plate 16 while the bottom plates of the filtration chambers 13a, 13b,..., which can be freely opened, are closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration technology for separating a solid liquid by filtering a liquid (hereinafter referred to as "waste liquid") such as sewage, sewage, river or lake water, and more specifically, a filtration used for filtration. The present invention relates to a treatment device and a method for cleaning a filter material.

[0002]

2. Description of the Related Art As a device for filtering waste liquid, as shown in FIG. 6, a filtering material b such as sand is contained in a filtering tank a, and a solid component of the waste liquid c supplied from the upper portion of the filtering tank is filtered. The purified liquid d remaining after filtering at b can be recovered from the recovery pipe e at the bottom of the filter tank a. Further, since the filter material b is clogged due to the attachment of the solid component, the washing water is sent in the reverse direction through the water supply pipe f connected to the bottom of the filtration tank a, and at the same time, the air is sucked through the intake pipe g connected to the bottom of the filtration tank a. The solid component that has been sent and is clogged between the filter media b is washed away through the drainage pipe h above the filter tank a.

As another method for cleaning the filter medium, a compression cleaning technique for compressing and cleaning the filter medium in the filter tank is disclosed in, for example, JP-A-58-119390 and 64-56195.
It is known from the publication.

[0004]

The above-mentioned conventional filtering device and method have the following problems.

<B> In the former cleaning method, a large amount of cleaning water is consumed, but the cleaning efficiency is low, and a cleaning water and air supply facility is required, resulting in a large-scale filtration device.

<B> In the former cleaning method, the drainage pipe h
Since a large amount of drain waste liquid containing solid components is generated through the above, a problem of treating the collected drain waste liquid newly occurs.

<C> In the latter cleaning method, since the layer thickness of the filter medium is large, the solid component causing the clogging penetrates deeply, so that even if the filter medium is compressed, it is difficult to remove the solid component and the cleaning is performed. The effect is low. Therefore, it is inevitable that the filtration function of the filtration device will deteriorate over time.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a simple structure with a high cleaning effect on a filter medium and an easy drain waste liquid treatment. An object of the present invention is to provide a device for filtering a waste liquid and a method for cleaning a filter material.

[0009]

The present invention is directed to a waste liquid filtering apparatus in which a filter medium is housed in a filter tank and the waste liquid supplied from above the filter tank is filtered, and the filter tanks are divided into a plurality of stages. The filter chamber is formed, a filter medium is housed in each of the filter chambers, a porous press plate for compressing the filter medium is vertically arranged in each of the filter chambers, and an open / close valve that can be opened and closed is provided on the bottom plate of each of the filter chambers. And a drainage pipe for draining drained waste liquid is connected to the bottom of each filtration chamber.

Further, the present invention provides a method for cleaning a filter medium housed in each of the filtration chambers having a plurality of compartments in the filtration tank,
The bottom plate of each filtration chamber is provided with an on-off valve that can be opened and closed during filtration, and the drainage liquid is collected by simultaneously squeezing the filtration medium in each filtration chamber with the on-off valve closed. It is a cleaning method.

[0011]

Embodiment 1 An embodiment will be described below with reference to the drawings.

<B> Filtration Tank FIG. 1 shows an example of the filtration device. Reference numeral 11 denotes a filter tank having a bottomed structure, in which a plurality of filtration chambers 13a, 13b, 13c ... Are formed by a multi-stage porous bottom plate 12, and a water collection chamber 14 is formed at the lowest position. Has been done. An elevating shaft 15 penetrating the center of the perforated bottom plate 12 is arranged in each of the filtration chambers 13a, 13b, 13c, ... Porous squeeze plates 16 facing the respective porous bottom plates 12 are fixed to the elevating shaft 15, and the respective porous squeeze plates 16 are vertically moved in the respective 13a, 13b, 13c. A drainage pipe 17 is connected to a lower portion of each of the filtration chambers 13a, 13b, 13c ..., and a valve 18 of each drainage pipe 17 is opened to collect a drainage waste liquid generated at the time of cleaning the filter medium 20 in the water collection chamber 14. It can be collected without going through.

<B> Filtration Material In each of the filtration chambers 13a, 13b, 13c ...
Is housed. The filter material 20 may be a material having elasticity and a filtering function, and for example, sponge or fiber is suitable.

<C> On-off valve An on-off valve function is provided on the bottom surface of each filtration chamber 13a, 13b, 13c .... As shown in FIG. 3, this on-off valve is composed of a laminated body of a perforated bottom plate 12 and a perforated rotary plate 19, and each hole 12a, 19a formed in both plates 12 and 19 by the rotating operation of the perforated rotary plate 19. Are opened when they coincide with each other, and closed when both holes 12a and 19a are displaced. The opening / closing valve function provided to the bottom surface of each of the filtration chambers 13a, 13b, 13c ... Is not limited to the above-mentioned structure, and various valves may be directly incorporated in the bottom surface, for example. To rotate each rotary plate 19, for example, as shown in FIG. 4, if a handle 19b provided on the rotary plate 19 is inserted into a guide port 11a formed horizontally on the side surface of the filtration tank 11, filtration is performed. The turning operation can be performed from the outside of the tank 11. In this case, it is necessary to provide a sealing material 11b on the guide port 11a to seal the handle 19b so as to prevent water from leaking from the inserted portion.

[0015]

Next, the operation of the filtration device will be described.

<a> Filtration of waste liquid FIG. 1 shows the time of filtration of the waste liquid.
The open / close valves on the bottoms of 3b, 13c ...
The valve 18 of No. 7 is closed. Further, each porous press plate 16 is located at the top. When the waste liquid is supplied from the upper part of the filtration tank 11 in this state, the waste liquid is supplied from the upper to the lower filtration chambers 13
The light is sequentially transmitted toward a, 13b, 13c ... The waste liquid supplied into the uppermost filtration chamber 13a passes through the porous press plate 16, then the filtering material 20, and further passes through the holes 19a and 12a of the rotary plate 19 and the porous bottom plate 12 to pass through the lower filtration chamber. It is sequentially supplied to 13b, 13c ... When the waste liquid passes through the filter medium 20 in each of the filtration chambers 13a, 13b, 13c ...
As a result of the filtration of the solid component, the content of the solid component contained in the waste liquid decreases toward the bottom. The purified water 30 thus purified is finally collected in the water collecting chamber 14 and discharged to the outside of the tank.

<B> Cleaning of Filter Material When cleaning the filter material 20, the operation of filtering the waste liquid is temporarily stopped, and as shown in FIG. 2, the filter chambers 13a, 13b, 13 are
The rotating plate 19 of c ... is rotated to close the on-off valve, and the valve 18 of the drainage pipe 17 is opened. And lifting shaft 15
The porous press plate 16 connected to the filter is simultaneously lowered to press the filter medium 20 in each of the filtration chambers 13a, 13b, 13c .... As a result, the drain waste liquid 32 in which the solid component is mixed with the waste liquid water contained in the filter medium 23 becomes the drain chambers 13a and 13a.
b, 13c ... are squeezed out and discharged to the outside of the tank through the drainage pipe 17 and collected. When the cleaning of the filtering material 20 is completed, the porous pressing plates 16 are raised and the filtering operation is restarted.

[0018]

[Embodiment 2] As shown in FIG. 5, each filtration chamber 13a, 13
The water supply pipe 21 for supplying water into the inside of b, 13c ... may be attached so that water can be sprayed onto each filter medium 20 from the water spray nozzle 22 at the tip of the water supply pipe 21. Water supply is intended to supply the minimum amount of water necessary for removing solid components in each filter medium 20 by squeezing, and is not intended to be washed away only by water supply. Therefore, water is sprinkled on the filter medium 20 before the pressing and not during the pressing.
As the water supply source, the purified water 30 may be pumped by the pump 23, or separate water may be supplied by the pump. In this embodiment, since the cleaning of the filter medium 20 can be repeated, the cleaning effect of the filter medium 20 is enhanced.

[0019]

[Embodiment 3] In the above embodiment, the case where a plurality of filtration chambers 13a, 13b, 13c ... Is formed in the filtration tank 11 has been described, but only one filtration chamber may be provided.

[0020]

Since the present invention is as described above, the following effects can be obtained.

<B> Since the filter medium can be squeezed and washed while the on-off valve is closed, a large amount of washing water is not required as in the past.

<B> The collected drainage effluent has a high concentration and a small amount as compared with the conventional washing method in which the washing water is made to flow backward to wash the filter medium, and therefore the treatment thereof is very easy.

<C> Since the filter medium is divided into a plurality of layers, even if a solid component enters the inside of the filter medium, the removal rate by squeezing becomes high and the filtration performance of the filter medium can be maintained for a long period of time. .

<D> When the on-off valve is composed of a laminated body of a porous bottom plate and a rotary plate, the structure of the on-off valve can be simplified and the cost can be reduced.

<E> When the water supply means is provided in the filtration tank or the filtration chamber, the filter material can be repeatedly pressed and washed, so that the washing effect is enhanced.

<F> It can be used in a wide range of fields from post-treatment of sewage to countermeasures against water-bloom in reservoirs, and has wide versatility.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a filtration processing apparatus according to a first embodiment.

FIG. 2 is an explanatory diagram of a filtration processing device when cleaning the filtration material.

FIG. 3 is a perspective view of a perforated bottom plate and a rotating bed that constitute the on-off valve.

FIG. 4 is a partial cross-sectional view of a filtration tank for explaining a turning operation of an opening / closing valve.

FIG. 5 is an explanatory view of another embodiment provided with water supply means.

FIG. 6 is an explanatory view of a filtration device on which the present invention is based.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Yai 1-16-14 Shibuya, Shibuya-ku, Tokyo Tokyu Construction Co., Ltd. (72) Kyoko Ueki 1-16-14 Shibuya, Shibuya-ku, Tokyo Tokyu Construction company (72) Inventor Hideki Harada 1-4-28 Nagamachi, Niigata Prefecture Nagaoka Housing 2-204

Claims (10)

[Claims] 1. A device for filtering a waste liquid, wherein a filter material is housed in a filter tank and the waste liquid supplied from above the filter tank is filtered, and a porous press plate is provided above the filter material in the filter tank so as to be movable up and down. An apparatus for filtering waste liquid, wherein an open / close valve that can be opened and closed is provided on the bottom plate of the filtration tank, and a drain pipe for draining drain waste liquid is connected to the bottom of the filtration tank. 2. A device for filtering a waste liquid, wherein a filter medium is housed in the filter tank and the waste liquid supplied from above the filter tank is filtered, and the filter tank is divided into multiple stages to form a plurality of filtration chambers. A filter medium is housed in the filter chamber, a porous press plate for compressing the filter medium is vertically arranged in each of the filter chambers, an open / close valve is provided on the bottom plate of each of the filter chambers, and each filter chamber is provided below the filter chamber. A drainage filtration device, wherein a drainage pipe for draining drainage drainage is connected. 3. A filter device for a waste liquid, wherein a filter medium is housed in a filter tank and the waste liquid supplied from above the filter tank is filtered, and the filter tank is divided into multiple stages to form a plurality of filtration chambers. A filter medium is housed in the filter chamber, a porous press plate for compressing the filter medium is vertically arranged in each of the filter chambers, and an open / close valve is formed on the bottom surface of each of the filter chambers. A drainage liquid filtration apparatus, characterized in that a drainage pipe for draining drainage liquid is connected to and a water supply means is provided in each filtration chamber. 4. A device for filtering a waste liquid, wherein a filter material is housed in the filter tank and the waste liquid supplied from above the filter tank is filtered, and a porous press plate is provided above and below the filter material in the filter tank so as to be vertically movable. An open / close valve configured by rotatably laminating a perforated rotary bed is provided on the perforated bottom surface of the tank, and a drainage pipe for draining drained wastewater is connected to the bottom of the filtration tank. Filtration processor. 5. A device for filtering a waste liquid, wherein a filter medium is housed in a filter tank and the waste liquid supplied from above the filter tank is filtered, and the filter tank is divided into multiple stages to form a plurality of filtration chambers. A filter material is housed in the filter chamber, a porous press plate for pressing the filter material is vertically arranged in each filter chamber, and a rotary bed having a perforated structure is rotatably laminated on the porous bottom surface of the filter tank. An on-off valve is provided, and a drainage liquid drainage drain discharge pipe is connected to the lower side of each filtration chamber. 6. A waste liquid filtering device, wherein a filter medium is housed in a filter tank and the waste liquid supplied from above the filter tank is filtered, wherein the filter tank is divided into multiple stages to form a plurality of filtration chambers. A filter medium is housed in the filter chamber, a porous press plate for compressing the filter medium is vertically arranged in each filter chamber, and a rotary bed having a perforated structure is rotatably laminated on the porous bottom surface of the filter tank. A filtration device for waste liquid, characterized by comprising an opening / closing valve for controlling the drainage liquid, connecting a drain pipe for draining drain waste liquid below each filtration chamber, and providing a water supply means in each filtration chamber. 7. A method for cleaning a filter medium contained in a filter tank, wherein a bottom plate of the filter tank is provided with an opening / closing valve that can be opened and closed during filtration, and the filter material is squeezed and drained with the opening / closing valve closed. A method for cleaning a filter medium, which comprises collecting waste liquid. 8. A method of cleaning a filter medium housed in each filtration chamber having a plurality of compartments inside the filtration tank, wherein a bottom plate of each filtration chamber is provided with an on-off valve that can be opened and closed during filtration, and the on-off valve is closed. In this state, the filter media in each filtration chamber are squeezed at the same time to recover the drain waste liquid. 9. A method of cleaning a filter medium contained in a filter tank, wherein a bottom plate of the filter tank is provided with an openable / closable open / close valve, and a water supply means for watering the filter medium in the filter tank is provided. A method for cleaning a filter medium, which comprises repeating the step of supplying water to the medium and the step of stopping the water supply and squeezing the filter medium with the on-off valve closed to recover the drain waste liquid. 10. A method for cleaning a filter medium contained in each filtration chamber having a plurality of compartments inside the filtration tank, wherein the bottom plate of each filtration chamber is provided with an openable / closable open / close valve which opens at the time of filtration. The process of supplying water to the filter medium by supplying water to the filter medium and the process of stopping the water supply and simultaneously squeezing the filter medium in each filtration chamber with the on-off valve closed to recover the drainage waste liquid are repeated. A method for cleaning a filter medium, which is characterized in that