JPH0220008Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a clarification filtration device that separates and removes suspended solids (SS) contained in water, sewage, industrial water, industrial wastewater, etc. for clarification. It is.

[Problems to be solved by conventional techniques and ideas]

As a clarifying filtration device that can handle highly turbid raw water,
Filtration devices that use sponge as a filter medium have come into use, and cleaning of the sponge filter medium can be broadly classified into the following two types.

Method of cleaning with air and water at the same time.

A method that utilizes the elasticity of a sponge to compress the sponge and discharge the SS inside the sponge.

In the above method, during cleaning, the liquid and sponge remaining in the tank are compressed by compressed air flowing from the top to the bottom of the filter tank, and the sponge inside the filter is compressed.
SS is what is removed. The advantage of this method is that the liquid can be removed in a short time, but the disadvantage is that after each cleaning the filter tank has to be filled with the raw water to be filtered, and of course there is no air source for compression. It becomes necessary.

Further, in the above method, the sponge is surrounded by one fixed perforated plate and one perforated plate connected to the piston, and these two perforated plates are brought closer together with the help of the piston. This compresses the sponge, but the disadvantage is that the water in the filter tank must be drained before compression, and it must be filled with raw water after cleaning, which takes time, and it takes time to move the piston. An air source or some other power source is required.

The present invention solves the above-mentioned problems in compression cleaning of sponge filter media, and provides a clarifying filtration device that enables easy compression cleaning of sponge filter media using water pressure without the need for an air source. The purpose is to

[Means for solving problems]

The present invention includes a lower porous body in which an upper porous body is fixed to the upper part of a pressure filter tank, a sponge filter medium is interposed in the upper porous body, and a pressure receiving plate is provided at the lower part to receive pressure from the upward flow of liquid. Connected so as to be able to rise freely, a raw water inflow pipe is opened in either the upper part of the upper porous body or below the lowest position of the lower porous body, and a treated water outflow pipe is opened in the other, and a wash water inflow pipe is opened in the lower part of the tank. The present invention provides a clarifying filtration device characterized in that a washing drain pipe is opened at the upper part of the tank.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a pressure filter tank, and an upper perforated plate 2 is fixed to the upper part of the tank. A lower perforated plate 5 with a filter medium 3 interposed therebetween and a pressure receiving plate 4 attached to the lower part for receiving pressure of the upward flow of liquid is connected so as to be able to rise freely, and a stopper 6 is provided on the tank peripheral wall to prevent the pressure receiving plate 4 from descending too much. is installed to limit its descent. A water-permeable material such as a net may be used as the upper perforated plate 2 and the lower perforated plate 5, and the openings thereof are designed to prevent the sponge filter medium 3 from flowing out.

As the sponge filter medium 3, a block of sponge corresponding to the filtration volume, a mat-like sponge divided into multiple layers, a regular or irregular-shaped sponge cut to a size larger than the opening of the perforated plate, a thin sheet-like sponge rolled into a roll. A rolled one is used.

In addition, the pressure receiving plate 4 in the first illustrated example has a flapper 4 that partially closes with the upward flow of the liquid to restrict the flow of the liquid, and opens with the downward flow of the liquid so as not to obstruct the flow of the liquid. '

Furthermore, a raw water inflow pipe 7 is provided on the upper part of the upper perforated plate 2.
and a washing drain pipe 8 are connected via a three-way switching valve V ₁ , and a treated water outflow pipe 9 is connected to the lower part of the filtration tank 1 via a treated water outflow valve V ₂ . The pipe 9 also serves as a wash water inflow pipe.

During filtration, pressurized raw water flows from the raw water inlet pipe 7 to the three-way switching valve V ₁ as shown in Figure 1.
The water enters the tank through the upper porous plate 2, passes through the sponge filter medium 3 in a downward flow, is filtered, becomes treated water, passes through the lower porous body 5, opens the flapper 4' and flows downward for treatment. The treated water flows out from the outflow pipe 9 via the water outflow valve _V2 .

If this kind of filtration is continued for a long time, the filtration resistance will increase, and in some cases, SS will begin to leak into the treated water, as in conventional filtration equipment, so the filter media should be cleaned.

To clean the filter media, use the 3-way switching valve as shown in Figure 2.
Switch V ₁ to communicate the inside of the tank with the cleaning drain pipe 8,
In this state, cleaning water (treated water or raw water may be used) is introduced into the tank from the treated water outflow pipe 9. At this time, the flapper 4' closes under the pressure of the washing water, and the lower porous plate 5 rises to compress the sponge filter medium 3 and discharge the trapped SS. on the other hand,
The cleaning water flows upward from the periphery of the pressure receiving plate and other gaps, is accompanied by the SS discharged from the sponge filter medium 3, and is drained from the cleaning drain pipe 8 through the upper perforated plate 2 and the three-way switching valve _V1 . Ru.

After discharging the SS to the outside of the tank, if the three-way switching valve V ₁ is switched to cut off the communication with the cleaning drain pipe 8, the pressure receiving plate 4
Since the pressure is the same on both the upper and lower surfaces, the lower perforated plate 5 is lowered by its own weight and the elasticity of the sponge filter medium 3. After that, 3-way switching valve
When the inside of the tank and the raw water inflow pipe 7 are communicated through V ₁ , a filtration state as shown in FIG. 1 is obtained, and the pressure receiving plate 4 is prevented from lowering by the stopper 6 .

In addition, SS can be achieved with just one compression of sponge filter media 3.
If the discharge is not sufficient, the lower porous plate 4 may be raised and lowered repeatedly using the washing water.

FIG. 3 shows another embodiment of the present invention, in which the flapper 4' of the first embodiment is omitted and the connection position of the treated water outflow pipe 9 is between the pressure receiving plate 4 and the lowest position of the lower perforated plate 4. A wash water inlet pipe 10 is connected to the lower part of the tank via a wash water inlet valve _V3 .

Therefore, during filtration, the treated water filtered by the sponge filter medium 3 in a downward flow flows out through the treated water outflow pipe 9 from between the pressure receiving plate 4 and the lower porous plate 5, and during cleaning, as shown in Fig. 4. , switch the 3-way switching valve V ₁ ,
Close the treated water outflow valve V ₂ and open the wash water inflow valve V ₃ .
The pressure receiving plate 4 receives pressure from the wash water flowing in from the lower wash water inflow pipe 10, and the sponge filter medium 3 is compressed and washed by the rise of the lower porous plate 5.

FIG. 5 further shows another embodiment of the present invention,
The positions of the raw water inflow pipe 7 and the treated water outflow pipe 9 of the example shown in the third figure are reversed to perform upward flow filtration, and _V4 indicates the raw water inflow valve.

Therefore, during filtration, raw water passes through the lower perforated plate 4 and is filtered by the sponge filter medium 3 in an upward flow without applying pressure to the pressure receiving plate 4, and the treated water is filtered through the three-way switching valve.
The treated water flows out from the outflow pipe 9 via _V1 . Also,
At the time of cleaning, the three-way switching valve _V1 is switched as shown in FIG. 6, the raw water inflow valve _V4 is closed, and the cleaning water inflow valve _V3 is opened, thereby performing the same cleaning as in the example shown in the fourth figure.

In addition, in each of the above embodiments, when treated water or other clear water is used as the washing water, filtration can be restarted as it is after washing, but if the raw water is relatively clean, the raw water may be used as the washing water. In that case, by branching the raw water inflow pipe and connecting it to the wash water inflow pipe, cleaning can be performed by simply opening and closing the valve without the need to start or stop the pump, but it is possible to restart the filtration. Immediately after, it is preferable to drain the treated water from the cleaning drain pipe 8 for a certain period of time.

[Effect of idea]

As described above, according to the present invention, the sponge filter medium can be easily compressed and cleaned using only the water pressure of the cleaning water, so there is no need for an air source or other equipment, such as a compressor or blower. This results in energy savings.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, Fig. 2 is an explanatory diagram of the state of Fig. 1 during cleaning, Fig. 3 is a longitudinal cross-sectional view showing another embodiment of the present invention, Fig. 4 The figure is the third
FIG. 5 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 6 is an explanatory diagram of the state of FIG. 5 during cleaning. 1...Pressure filter tank, 2...Lower perforated plate, 3...
...Sponge filter material, 4...Pressure plate, 4'...Flapper, 5...Lower perforated plate, 6...Stopper, 7
... Raw water inflow pipe, 8 ... Washing drain pipe, 9 ... Treated water outflow pipe, 10 ... Washing water inflow pipe, V ₁ ... Three-way switching valve, V ₂ ... Treated water outflow valve, V ₃ ... Washing water inflow valve, V ₄ ...Raw water inflow valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An upper porous body is fixed to the upper part of the pressure filter tank, a sponge filter medium is interposed in the upper porous body, and a pressure receiving plate that receives the upward flow of liquid at the lower part. A lower porous body provided with the above porous body is connected so as to be able to rise freely, a raw water inflow pipe is opened in either the upper part of the upper porous body or below the lowest position of the lower porous body, and a treated water outflow pipe is opened in the other, and A clarification filtration device characterized by having a washing water inflow pipe at the bottom of the tank and a washing water drain pipe at the top of the tank. (2) The clarification filtration device according to claim 1, wherein the raw water inflow pipe or the treated water outflow pipe is opened between the pressure receiving plate and the lowest position of the lower porous body. .