JPH02241508A - Filtration apparatus with both upward and downward flows - Google Patents

Abstract

PURPOSE:To contrive an improvement in capacity and to make filter media washed easily and surely by packing a floating filter medium and a sinking filter medium into a filtration tank equipped with a supply port for an original water at its middle part so as to make a filtration possible both in upward and downward directions. CONSTITUTION:An original water is filled into a filtration chamber 1a through a supply port 8 and separates a floating filter medium 6 and a sinking filter medium 7 upward and downward from each other due to a density difference between them. Two filter medium layers are, therefore, formed both at the top and the bottom of the chamber 1a. The original water is divided into upward and downward flows, which are filtered by layers of the floating filter medium 6 and the sinking filter medium 7 respectively. When a rate of filtration becomes slow, a pump P is stopped, the original water is made to flow reversely and discharged through the supply port 8 and a discharge pipe 12 until a water level arrives at a lower limit L of a water level gauge 15. Next, a washing air is ejected into the original water by a blower B, the floating filter medium 6 and the sinking filter medium 7 are agitated for the sake of having suspended substances, which are attached to them, removed, and the original water containing those substances is discharged out the discharge pipe 12. The washing of filter media is finished and the filtration process is reopened, after the original water is once again supplied into the filtration chamber 1a, the aeration washing is repeated for a short time and the original water containing remaining suspended substances is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an up-and-down bidirectional flow filtration device used to remove suspended matter contained in polluted water such as river water or industrial wastewater.

[Conventional technology]

Conventionally, the filter bag 2 that removes suspended solids contained in polluted water such as river water or industrial wastewater usually uses granular filter media, and the granular filter media contaminated by filtration is backwashed within the device to repurify it. It is possible to do so.

These conventional filtration devices are categorized according to the direction of filtration. Downflow filtration device.

A single layer of granular filter media (hereinafter referred to as floating filter media) with a specific gravity smaller than that of water is arranged above the raw water supply port [JP-A-60-10
6511.61-187908], or a floating filter medium and a granular filter medium (hereinafter referred to as a sinking filter medium) having a higher specific gravity than water are arranged in a reverse layer [JP-A-59-123505. 6
2-38214], ■ Upward flow filtration device that filters raw water upward. ■Vertical counterflow filtration device [Utility Model Publication No. 58-33764, Japanese Patent Publication No. 48-50352.59
-95907] etc.

[Problem to be solved by the invention]

The processing capacity of a filtration device is proportional to its filtration area, so
In a system that filters in a single direction, such as the above-mentioned conventional (1) downward flow filtration device and (2) upward flow filtration device, only half the capacity of 1 Ita can be obtained compared to the above-mentioned conventional (2) vertical counterflow filtration device.

On the other hand, in the above-mentioned conventional vertical counterflow filtration device that takes water from within the filter media layer placed in the middle, the filtration area is doubled compared to the downward flow filtration device and the upflow filtration device. However, when using granular filter media, when backwashing it,
The filter media is classified by individual weight and particle size and arranged with a difference in the top and bottom, and the filter media layer that is reconstituted after backwashing causes a difference in filtration loss between the top and bottom, making it impossible to distribute raw water evenly in the top and bottom. However, there is a problem in that the filtration capacity cannot be improved commensurately with doubling the filtration area.

Another possible method is to place a floating filter medium in the upper part and a sinking filter medium in the lower part, and then input raw water into the middle part of the tank to filter it in both directions, but in this case, the upper part of the filtration tank and Since it is necessary to provide a water collection mechanism on both sides of the lower part, even if backwash water is sent into the filtration tank from below or above to clean the filter media, the backwash water, which has an increased concentration of suspended solids due to filter media cleaning, will If the wash water is discharged from the top or bottom, the water collection mechanism at the top or bottom will be contaminated and subsequent filtration will be hindered. In this case, a filter media strainer is required to prevent the filter media from being washed away along with backwash water. On the other hand, if a filter media strainer is provided in the filtration layer, the filter media strainer may become contaminated with suspended matter and become clogged. Or,
Because the filter media that tries to flow out with the backwash water becomes clogged, there are problems such as the backwash water not being able to be drained smoothly unless frequent cleaning is performed, and maintenance and management related to filter media cleaning. However, due to the difficulties involved, it has not been put into practical use as a device.

The present invention can solve the above-mentioned problems with the conventional filtration device, that is, it can filter both up and down, improving processing capacity, and the filter medium can be easily and reliably washed. The purpose is to provide equipment.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following configuration. That is, the vertical two-way flow filtration device of the first invention includes a granular filter medium having a specific gravity smaller than that of water, and a filtration tank having a water collection mechanism in the upper and lower parts and a raw water supply port in the middle part. filled with a granular filter medium having a specific gravity greater than that of water, and
The suction and exhaust pipes are connected and branched to the upper filtration pipe connected to the upper water collection mechanism, and the cleaning air supply pipe is connected and branched to the lower filtration water pipe connected to the lower water collection mechanism, while the raw water supply port is connected and branched. A drain pipe is connected and branched to a communicating water supply pipe, and a strainer for preventing granular filter media from being washed away is provided in the common water supply/drainage pipe between the raw water supply port and the drain pipe.

In addition to the above-described configuration, the second invention provides a two-way flow filtration device in which a backwash water supply pipe is connected and branched to the lower filtration water pipe communicating with the lower water collection mechanism.

[Effect]

In the up-and-down bidirectional flow filtration device of the present invention, the filtration tank is filled with granular filter media whose specific gravity is smaller than that of water and granular filter media whose specific gravity is larger than that of water. By feeding raw water into the interior through the mouth, a filter layer made of granular filter media with a specific gravity smaller than that of water is formed in the upper part of the filtration tank, and a filter media layer made of granular filter media with a higher specific gravity than water is formed in the lower part of the filtration tank. It can be filtered in the opposite direction. Furthermore, by filtrating in both directions, it is possible to obtain twice the filtration area in a filtration tank of the same capacity as in a single direction filtration system such as an upward or downward flow filtration device.

In addition, since the upper and lower water collection mechanisms are provided, the flow rate of filtrate through the upper and lower filtration water pipes that communicate with the upper and lower water collection mechanisms can be adjusted to easily increase the amount of filtration in both directions. can be equalized to

Hereinafter, cleaning of the granular filter medium in the up-and-down bidirectional flow filtration device of the present invention will be explained along the steps. First, the supply of raw water is stopped, and a predetermined amount of raw water in the filtration tank is drained from a branched drain pipe that is connected to a water supply pipe that communicates with the raw water supply port. Air is sucked into the upper part of the filtration tank through the intake and exhaust pipes that are connected to the water pipes and branched. Then, the water level in the filtration tank is set lower than the lower end of the upper water collection mechanism.

Next, cleaning air is supplied into the filtration tank from the cleaning air supply pipe that is connected to and branched off from the lower filtration water pipe that communicates with the lower water collection mechanism, while the air supply pipe is connected and branched to the upper filtration water pipe that communicates with the upper water collection mechanism. Exhaust air from the intake and exhaust pipes. The upward air flow that is formed in the filtration tank by the supply and discharge of this cleaning air agitates the granular filter media in the filtration tank, causing them to collide and rub against each other. The suspended solids are separated and suspended in the raw water in the filtration tank. When supplying this cleaning air, the upper water collection mechanism is located above the water surface and is not contaminated by contact with the raw water in the filtration tank, which has an increased concentration of suspended solids (on the other hand, the lower water collection mechanism , backwashed by cleaning air.

Next, a small amount of raw water is sent from the water supply port side to the filtration tank side, and a strainer for preventing granular filter media from being washed away is installed in the common water supply/distribution pipe between the raw water supply port and the drain pipe. Backwash. This is to prevent the granular filter media stirred by the above-mentioned supply and discharge of cleaning air from entering the strainer to prevent runoff and causing clogging when draining raw water as described below. During this backwashing, the granular filter medium that has entered the strainer for preventing spillage and the pipe section between the strainer and the feed port is returned to the filtration tank.

Next, the raw water in the filtration tank is drained from a drain pipe that is connected to and branched from a water supply pipe that communicates with the raw water supply port.

By this drainage, the suspended solids separated from the granular ill filter material are discharged and removed from the system. In addition, during this drainage, the granular filter media in the ILI filtration tank is blocked by a strainer installed in the common water supply/distribution pipe between the raw water supply port and the drain pipe, preventing it from flowing out to the outside. will be prevented.

Continuing from the above, a predetermined amount of raw water is re-feeded into the filtration tank from the water supply pipe side, and the same air cleaning, strainer backwashing, and drainage cleaning steps as described above are repeated several times to remove the granular filter media. The separated suspended solids can be reliably discharged and removed from the system.

In addition, in the upper and lower two-way flow filtration device of the second invention, instead of re-feeding the raw water from the water supply pipe side as described above, from the backwash water supply pipe that is connected and branched to the lower filtration water pipe that communicates with the lower water collection mechanism. By supplying backwash water and discharging it from the drain pipe after passing through the filtration tank, suspended solids separated from the granular filter material can be efficiently discharged and removed from the system.

〔Example〕

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

FIG. 1 is a conceptual explanatory diagram of the up-and-down bidirectional flow filtration device of this embodiment.

In FIG. 1, (1) is a filtration tank, and this filtration tank (1) is a vertical airtight container. ) and a water collection chamber (1c) below it.

At the top of this filtration tank (1) is an upper water collection strainer (
2), and on the other hand, a plurality of lower water collecting strainers (3) are arranged on the lower partition wall (lb), and a filtration chamber (lb) is provided.
a) and the water collection chamber (1c) are communicated with each other through these lower water collection strainers (3) so that water can flow therethrough.

In addition, cylindrical air distribution short pipes (3a) are installed vertically on the lower surface of the partition wall (lb) directly below these lower water collection strainers (3), and each air distribution short pipe (3a
As shown in FIG. 2, which is a partially enlarged cross-sectional view of FIG.

(4) is an upper filtration water pipe, and (5) is a lower filtration water pipe, and these upper and lower filtration water pipes (4) and (5) are communicated with the upper water collection strainer (2) and the water collection chamber (LC). In addition, filtered water valves (4a) and (5a) are provided in the middle of each, and the outlet ends are connected to and merged with the filtered water main pipe.

(6) is a floating filter medium, and this floating filter medium (6) is a particulate material that floats on water (specifically, expanded polystyrene particles, polypropylene particles, etc. used in a normal upward flow filtration system), As shown in the figure, raw water W fed into the filtration tank (1)
It floats inside and forms a filter medium layer above the filtration chamber (1a) of the filtration tank (1).

(7) is a sinking filter medium, and this sinking filter medium (7) is a granular material that sinks in water (specifically, sand grains, anthracite grains, etc. used in normal downward flow filtration systems), as shown in the figure. As such, it sinks in the raw water W fed into the filtration tank (1) and forms a filter medium layer in the lower part of the filtration chamber (la) of the filtration tank (1).

(8) is a raw water supply port, and this raw water supply port (8) is connected to a filtration tank located slightly above the upper interface of the filter medium layer formed by the sinking filter medium (7) at the bottom of the filtration chamber (1a). (1) It is provided through the side wall.

(9) is a filter medium strainer, and this filter medium strainer (9) is attached to the water supply pipe G[Il that communicates the raw water supply port (8) and the raw water pump P. Further, this filter medium strainer (9) is removably installed in the vicinity of the raw water supply port (8), and on the other hand, the water supply pipe 0ω is equipped with a raw water valve (LOA).

00 is a bypass pipe, and this bypass pipe 00 has a filter medium strainer (9) installed by connecting the front and back of the part, and when the filter medium strainer (9) is removed for cleaning etc., the raw water is removed. This serves as a W feed path. In addition, valves are provided before and after the filter medium strainer (9) and in the middle part of the bypass pipe (11).
By opening and closing these valves, the filter medium strainer (9) can be removed and cleaned even during filtration.

02+ is a drain pipe, and this drain pipe 021 is equipped with a drain valve (12a), and has a filter medium strainer (9) and a raw water valve (
10a) is connected to and branched from the water supply pipe 0[D].

03) is an intake/exhaust pipe, and the intake/exhaust pipe side is equipped with a float valve (13a) and is connected to and branched from an upper filtration water pipe (4) located directly above the filtration tank (+).

(Incorporated) is an air supply pipe, and the air supply pipe side is equipped with an air valve (14a), and is connected and branched to the lower filtration water pipe (5) directly below the filtration tank (1), and is used for cleaning. It is connected to a blower B for pressure-feeding air.

Q5) is a water level detector, and this water level detector 0ω is
The upper water collection strainer (
2) A ball detection water level L1 located slightly below the lower end and a lower detection water level L2 located below this ball detection water level Ll are detected, and are connected to an operation control device not shown here. It is.

00 and plane are flowmeters, and these flowmeters 0007
) is attached to the upper filtration water pipe (4) and the lower filtration water pipe (5) upstream of the filtration water valves (4a) and (5a).

The side is a backwash water pipe, and one end of this backwash water pipe surface is connected to the water supply pipe θ0) between the raw water valve (10a) and the raw water pump P, and the other end is connected to the filtration tank (1). It is connected to the lower filtration water pipe (5) between the cleaning air supply pipes (14), and is equipped with a backwash water valve (18a) in the middle.

09) and ■ are drainage pipes, and these drainage pipes OgJ
121 is connected and branched on the upstream side of the filtrate valves (4a) and (5a) of the upper filtration water pipe (4) and the lower filtration water pipe (5), and is provided with a waste water valve (19a) and (20a), respectively. It is something.

Note that the opening and closing of the valves provided in each of the above-mentioned pipelines is controlled by an operation control device, which is not shown here. Further, these valves have a structure in which the degree of opening can be freely set, and the flow rate can be controlled by adjusting the degree of opening.

Filtration and filter medium cleaning by the vertical two-way flow filtration device of this embodiment having the above configuration will be described in detail below along with each step.

(a) jlU! 1 The operation control device controls the raw water valve (10a) of the water supply pipe 0ω and the filtrate water valve (4a) of the upper and lower filtration water pipes (4) (5) (
5a) is opened, the drain valve (12a) of the drain pipe 02) and the air valve (14a) of the cleaning air supply pipe 070 are operated to close, and the raw water pump P is operated to start pumping the raw water W. .

Raw water W from the raw water pump P is sent to the filtration tank (1) side via the water supply pipe 0■ and the filter medium strainer (9), and fills the filtration chamber (1a) through the raw water supply port (8). At the same time, the floating filter material (6) and the sinking filter material (7) filled in this filter chamber (la) P'7 are separated into upper and lower parts due to the difference in specific gravity, so that a filter material layer is formed on both the upper and lower sides of the filter chamber (1a). to form.

Moreover, the raw water W fed into the filtration chamber (la) is divided into upper and lower parts within this filtration chamber (1a). Then, the upward raw water W is filtered through the floating filter medium (6)N, and reaches the filtrate main pipe via the upper water collection strainer (2) and the upper filtration water pipe (4), while the downward raw water W The water is filtered through the sinking filter medium (7) layer, and after passing through the lower water collection strainer (3) and collecting in the water collection chamber (LC), it passes through the lower filtration water pipe (5) and reaches the water intake main pipe. They join together at the water intake main and are discharged outside the system.

As described above, the two-way up and down flow filtration device of this embodiment can filter the raw water W in both directions, up and down, compared to a system that filters in a single direction like an up or down flow filtration device. , it is possible to obtain twice the filtration area with a filtration tank of the same capacity, making it possible to double the filtration capacity.

In this example, the amount of filtrate water discharged through the upper filtration water pipe (4) and the lower filtration water pipe (5) is measured by the flowmeter 0007) provided in these upper and lower filtration water pipes (4) and (5). At the same time, check each filtrate valve (4a) (5
By adjusting the opening degree of a), the amount of upward filtration water and the amount of downward filtration water were continuously equalized.

(b) Kashibayashi Enkaku In the up-and-down bidirectional flow filtration device of this embodiment, when the filtration speed decreases to a certain degree due to continued filtration, the filter medium is cleaned by the following steps.

■Water drainage process; At the same time, stop the operation of the raw water pump P and stop pumping the raw water W, and at the same time, the raw water valve (10a) of the water supply pipe 0
) and the filtrate water valves (4a) (
5a) to close, and then open the drain valve (12a) of the drain pipe (+2). At this time, the filtration chamber (1
The raw water W above the sinking filter medium (7) N in a) flows backward through the raw water supply port (8) and the filter medium strainer (9) and begins to flow out from the drain pipe (+2), while the filtration chamber ( The float valve (13a) on the intake/exhaust pipe surface due to the drop in the water level in
The float automatically lowers and the float valve (13a)
is in the open state, and the filtration chamber (1
a) Air is drawn into. Subsequently, when the water level in the filtration chamber (1a) drops to the lower detection water level L2 of water level detection 2W 05), the drain valve of the drain pipe 021 is activated via the operation control device connected to this water level detector θω. (12a) is activated to complete the water removal process.

At the end of this draining process, the upper water collection strainer (2) is exposed to the air pocket formed in the upper part of the filtration chamber (1a) of the filtration tank (1).

■Draining process: Following the water draining process, the air valve (14a) of the air supply pipe is opened and the blower B is operated to start pumping the cleaning air.

The cleaning air from blower B is sent into the water collection chamber (1c) of the filtration tank +1) via the air supply pipe 04 and the lower filtration wood pipe (5), and from this water collection room (lc), the air distribution short Pipe (3a)
The water is evenly distributed and ejected into the raw water W in the filtration chamber (la) through the lower water collection strainer (3).

The air blown into the raw water W in the filtration chamber (1a) violently stirs the raw water W and the floating filter media (6) and sinking filter media (7) in the raw water W, and then flows through the upper water collection strainer ( 2), is exhausted to the outside via the upper filtration water pipe (4), the float valve (13a), and the intake/exhaust pipe Q3).

Through this air washing step, the floating filter medium (6) in the filtration chamber (la)
The suspended solids trapped on the surface of the sinking filter media (7) are peeled off by the collision and friction between the floating filter media (6) and the sinking filter media (7) due to stirring, and are mixed into the raw water W in the filter tank.・Can be suspended. In addition, in this air washing process,
Since the upper water collection strainer (2) is located higher than the water surface of the raw water W and the upper surface of the floating filter layer (6), it does not impede the discharge of stirring air, and the suspended solids concentration increases. There is no fear of contamination due to contact with raw water W.

■' Stray ゛q; The floating/sinking filter media (6) and (7) stirred in the air washing process are transferred to the filter media strainer (9) and between the filter media strainer (9) and the raw water supply port (8). They may enter the water supply pipe θω, and during the next drainage process, they may catch suspended solids in the source water W and cause clogging, making normal drainage impossible. In this process, in order to prevent such a situation from occurring,
This is done in order to return the floating/sinking filter media (6) (7) that have entered the filter media strainer (9) and water supply pipe 0 (D) into the filtration chamber (1a).

After sufficient air washing, first, the blower B is stopped and the air valve (14a) of the air supply pipe 04) is closed.Next, the raw water pump P is operated at the same time.
Open the raw water valve (10a) to supply raw water W to the water supply pipe aω.
and is pumped into the filtration chamber (1a) through the filter medium strainer (9).

As a result, the filter medium strainer (9) and the water supply pipe 0 [D
The floating/sinking filter media (6) (7) that has entered the raw water W
is returned to the filtration chamber (1a).

When the water level in the filtration chamber (la) rises to the water level Ll detected by the water level detector c, this water level detector 0ω
An operation control device connected to stops the raw water pump P and at the same time closes the raw water valve (10a).

At this time, the water level in the filtration chamber (1a) is located slightly below the lower end of the upper water collection strainer (2).
Since it stops at the height of the ball detection water level L1, there is no concern that the upper water collection strainer (2) will come into contact with the raw water W with an increased concentration of suspended solids and be contaminated.

■Two steps of clean water; following the filter media strainer backwashing process, the drain valve (
12a) is operated to open, and the raw water W in which the concentration of suspended solids in the filtration chamber (la) has increased is discharged from the drain valve (12a). At this time, the water level of the raw water W in the filtration chamber (la) gradually decreases, and the lower end of the floating filter material (6) layer floating in this raw water W reaches the raw water supply port (8). Although the floating filter media (6) tries to flow out of the system through the raw water supply port (8), they are captured by the filter media strainer (9) and are prevented from flowing away.

■Ice bed construction and; At the stage where the drainage process is finished, the filtration chamber (+)
Suspended substances remain on the surface of the floating filter medium (6) and in the gaps between the submerged filter medium (7) at the same concentration as during air washing, so the remaining suspended substances are removed and removed in the following water washing process. Discharge and repurify the floating/sinking filter medium (6).

First, close the drain valve (LOA) of the drain pipe, and
0) is opened, and the raw water pump P is operated to re-feed new raw water W into the filtration chamber (1a). When the water level in the filtration chamber (1a) reaches the lower detection water level L1 of the water level detector θ, the operation of the raw water pump P is stopped, the raw water valve (10a) is operated to close, and the raw water W stop resupplying.

Next, the above-mentioned (1) air washing process is performed for a short time, and the suspended solids remaining on the surfaces and gaps of the floating/sinking filter media (6) and (7) are mixed into the resupplied raw water W. Q After making it cloudy, perform the filter medium strainer backwashing step (1) described above, followed by the draining step (2) described above.

Normally, it is possible to return to the above-mentioned (a) filtration by resupplying and draining the raw water W as described above, but if the floating/sinking filter medium (6) is not sufficiently cleaned by this water washing step alone, ■By repeating the water washing process several times, more thorough cleaning and repurification can be achieved.

Note that the filter medium strainer (9) is contaminated by suspended solids in the raw water W that is fed and discharged, but the raw water W that is drained plays the role of backwashing the dirt caused by the raw water W that is being fed. In addition, since the supplied raw water W plays an adverse role in lη leakage caused by the raw water W being drained, this filter medium strainer (9) is not blocked by suspended matter in the raw water W and is always in normal condition. The raw water W can be distributed to.

As described above, the filter medium cleaning can be completed and filtration can be resumed. However, in order to wash the filter medium in a shorter time, the following ② reverse upturn process is performed instead of the above ② water washing step.

From the state in which the above-mentioned drainage process (1) has been completed, that is, from the state in which all valves other than the float valve (13a) of the intake/exhaust pipe 0 (2) and the drain valve (12a) of the drain pipe 021 are closed, the backwash water pipe 08 ) is opened and the raw water pump P is operated to start supplying raw water W.

Raw water W from the raw water pump P is sent to the water collection chamber (lc) of the filtration tank (1) via the backwash water pipe 0υ and the lower water collection pipe (5), and from this water collection chamber (lc), the water is sent to the lower water collection chamber (lc). Water collection strainer (
3) and is ejected into the filtration chamber (la).

Then, this raw water W backwashes the lower water collection strainer (3), and the floating/sinking filter medium (6) in the filtration chamber (1a).
While stirring (7), the suspended substances remaining on the surfaces of these substances are mixed and suspended and taken in, and are discharged from the drain pipe (11) through the filter medium strainer (9).

By this reverse process, the suspended solids remaining on the surfaces and gaps of the floating/sinking filter media (6) and (7) in the filtration chamber (1a) are reliably and efficiently discharged from the system.

Through the steps described above, normal filter medium cleaning is completed and filtration is restarted, but clearer filtered water is required, and the contamination of the water collection chamber (1c) and lower water collection pipe (5) by raw water is purified. If necessary, immediately after restarting filtration,
Upper and lower filtration water pipes (4) (5) filtrate water valve (4a) (
5a) and close the drainage pipe 0! D@'s drainage valve (19
a) Open (20a) and drain the filtered water from the drain pipe 09)el, and after the drained water becomes clear, flow the filtered water to the filtrate main pipe side to proceed to normal filtration. do.

As shown in No. 2, according to the up-and-down bidirectional flow filtration device of this embodiment, it was captured by the filter medium during filtration! A: Turbid substances can be efficiently washed and discharged/removed from the system, filtration efficiency can be easily restored, and the water source and feed pump for washing water can be unified, making the configuration simple. It can be taken as a thing.

In addition, in the vertical bidirectional flow filtration device of this embodiment, backwashing with normal filtered water, which is performed when clearer filtered water is required, is also possible.

In other words, following the above-mentioned ■drainage process or ■water washing process,
The filtered water is sent back from the main water collection side to the filtration chamber (1a).
By discharging this water from the drain pipe, normal backwashing with filtered water can be performed. In this case, the filtered water that is sent back from the main water collection pipe is controlled by the opening and closing of the filtrate valves (4a) and (5a).
4) and the lower water collection pipe (5), the floating filter medium (6) 1! It is also possible to backwash both the submerged filter medium (7) and the submerged filter medium (7) at the same time.

In addition, in the up-and-down bidirectional flow filtration device of this embodiment, the backwash water pipe 0IID is connected to the raw water pump, and backwashing is performed with raw water W. It may also be connected and used as a source for backwashing with other backwash water.

〔Effect of the invention〕

As described above, according to the up-and-down bidirectional flow filtration device of the present invention, raw water can be filtered in both the up and down directions, and the upward or downward flow i1. ! Compared to a method that filters in a single direction such as a filtration device, it is possible to obtain twice the filtration area with a filtration tank of the same capacity, making it possible to double the filtration capacity. The suspended solids trapped in the filter media can be reliably and efficiently washed, discharged and removed from the system, and the filtration efficiency can be easily restored, which simplifies maintenance and management related to cleaning the filter media. It is possible to achieve remarkable effects such as being able to unify the water source of the washing water and the feed pump, and simplifying the configuration.

[Brief explanation of drawings]

FIG. 1 is a conceptual explanatory diagram of a vertical two-way flow filtration device according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of FIG. 1. Upper water collection station (3) - Lower water collection station (4) - Upper filtration wood pipe, (6) - Floating filter medium, (8) - Raw water supply port, 00) - Water supply pipe, Side - Suction/exhaust pipe, 051 -Water level detector, B-Blower, P-Raw water pump, (LA)--Filtration chamber, (LC)--Water collection chamber, Lena, (5)-Lower filtration water pipe, (7)-Sinking Filter medium, (9) - Filter medium strainer, 021 - Drain pipe, θ4 - Air supply pipe, 08) - Backwash water pipe, D - Filtered water main pipe, W - Raw water. Patent Applicant: Shinko Faudler Environmental Management Co., Ltd. Agent: Akira Kanamaru, Patent Attorney: Hand υε (heavy pressure (l)) 1. Display of the incident 1999 Patent Application No. 611913 2, Name of the invention Device 3, Person making the correction Relationship with the cow Patent applicant Location 1-4'fi78, Wakihama-cho, Chuo-ku, Kobe Name Name: Shinko Faudler Environmental Management Co., Ltd. Representative Sakae Katayama - Postal code: 657 Nada, Kobe City Nissin Blueprint Building 4F 4, 5-1-3 Iwaya Kitamachi, Ward 4, Agent Address 6, “Detailed Description of the Invention” column 7 of the specification to be amended, Contents of the amendment (1) Page 17 of the specification In line 17, “in the filtration tank”
The text has been corrected to read "inside the filtration chamber (1a)." (2) On page 20, line 5 of the specification, the phrase “floating/sinking filter medium (6)” was replaced with “floating/sinking filter medium (6) (
7)”. (3) On page 20, line 6 of the specification, “Drain valve (10a
) should be closed," should be corrected to read, "The drain valve (12a) should be closed." (4) “Lower detection water level L” on page 20, line 10 of the specification
1" is corrected to "lower detection water level L2." (5) Ming! Book Ill, page 20, line 20 says, “Levitation.
Where it says “Sinking filter media (6)”, replace it with “Floating/Sinking filter media (
6) Correct j in (7). (6) On page 22 of the specification, line 8, the phrase “from drain pipe (II)” is amended to read “from drain pipe 0 to 21.”

Claims (2)

[Claims] (1) Filling a filtration tank with a water collection mechanism in the upper and lower parts and a raw water supply port in the middle part with a granular filter medium having a specific gravity lower than that of water and a granular filter medium having a specific gravity higher than that of water, In addition, the suction and exhaust pipes are connected and branched to the upper filtration water pipe that communicates with the upper water collection mechanism, and the cleaning air supply pipe is connected and branched to the lower filtration water pipe that communicates with the lower water collection mechanism, while raw water is supplied. A drain pipe is connected and branched to the water supply pipe communicating with the mouth, and a strainer for preventing granular filter media from being washed away is provided in the common supply/drainage pipe between the raw water supply port and the drain pipe. Up and down bidirectional flow filtration device. (2) The vertical bidirectional flow filtration device according to claim 1, characterized in that a backwash water supply pipe is connected and branched to the lower filtration water pipe communicating with the lower water collection mechanism.