JPH0220007Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] 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]

In the present invention, a lower porous body is fixed to the lower part of a pressure filter tank, an upper porous body connected to a float is placed in a floating state in the upper part, and a sponge filter medium is filled between these upper and lower porous bodies. The float is equipped with a pressure receiving plate that receives pressure from the downward flow of liquid, and a raw water inflow pipe is opened at either the lower part of the lower porous body or above the floating upper limit position of the upper porous body, and a treated water outflow pipe is opened at the other side. Further, the present invention provides a clarifying filtration device characterized in that a washing water inflow pipe is opened in the upper part of the tank and a washing water drain pipe is opened in the lower part of the tank.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In Fig. 1, 1 is a pressure filter tank, a lower perforated plate 2 is fixed to the lower part of the tank, and a float 3 is connected to the upper part. Although the upper perforated plate 4 is placed in a floating state, a stopper 5 is provided on the tank peripheral wall to restrict the float 3 from rising too high. A sponge filter material 6 is filled between the lower perforated plate 2 and the upper perforated plate 4, but water-permeable materials such as nets can also be used for these perforated plates, and the openings are filled with the sponge filter material 6. Make sure it does not leak out.

As the sponge filter medium 6, a block of sponge corresponding to the filtration volume, a mat-shaped sponge divided into multiple layers, a regular or irregular-shaped sponge cut to a size larger than the opening of a perforated plate, a thin sheet-like sponge rolled into a roll. A rolled one is used.

In addition, the upper part of the upper perforated plate 4 receives pressure from the downward flow of the liquid and closes to restrict the flow of the liquid.
A flapper 7, which serves as a pressure receiving plate that opens with the upward flow of the liquid so as not to obstruct the flow of the liquid, is pivotally attached to the float 3 or the upper perforated plate 4 as shown in the illustrated example.

Furthermore, a raw water inflow pipe 8 is provided at the bottom of the lower perforated plate 2.
and a washing drain pipe 9 are connected via a three-way switching valve V ₁ , and a treated water outflow pipe 10 is connected to the top of the filtration tank 1 .
are connected via a treated water outflow valve _V2 , and this treated water outflow pipe 10 also serves as a wash water inflow pipe.

During filtration, as shown in Figure 1, the pressurized raw water flows from the raw water inlet pipe 8 to the three-way switching valve _V1.
The water enters the tank through the lower porous plate 2, passes through the sponge filter medium 6 in an upward flow, is filtered, becomes treated water, passes through the upper porous body 4, opens the flapper 7 and flows upward, and the treated water Processed water outflow pipe 1 via outflow valve V ₂
Flows from 0.

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 9,
In this state, cleaning water (treated water or raw water may be used) is introduced into the tank from the treated water outflow pipe 10. At this time, the flapper 7 closes and the upper perforated plate 4 is lowered by the pressure of the washing water, and the sponge filter medium 6
It compresses and discharges the trapped SS. On the other hand, the cleaning water flows downward from the peripheral area of the float 3 and other gaps, and is accompanied by the SS discharged from the sponge filter medium 6, passing through the lower perforated plate 2 and the three-way switching valve _V1 , and then flowing from the cleaning drain pipe 9. Drained.

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 9, the pressure will be the same on the top and bottom surfaces of the float 3, which will reduce the elasticity of the sponge filter medium 6. The upper porous body 4 rises due to the floating of the float 3 and returns to the position where it is pressed by the stopper 5. Thereafter, if the inside of the tank is further communicated with the raw water inlet pipe 8 through the three-way switching valve _V1 , a filtration state as shown in FIG. 1 is achieved.

In addition, SS can be achieved by compressing the sponge filter medium 6 only once.
If the discharge is not sufficient, the upper porous plate 4 may be lowered and raised repeatedly using the washing water.

FIG. 3 shows another embodiment of the present invention, in which the area of the float 3 of the first illustrated example is increased, a float 13 is used which also serves as a pressure receiving plate, the flapper 7 of the first illustrated example is omitted, and the treated water is The connecting position of the outflow pipe 10 is between the floating upper limit position of the float 13 and the upper perforated plate 4, and the washing water inflow pipe 14 is connected to the washing water inflow valve at the top of the tank.
It is connected via _V3 .

Therefore, during filtration, the treated water filtered by the sponge filter medium 6 in an upward flow flows out from between the float 13 and the upper perforated plate 4 through the treated water outflow pipe 10,
During washing, as shown in FIG. 4, the three-way switching valve _V1 was switched, the treated water outflow valve _V2 was closed, and the washing water inflow valve _V3 was opened, and the washing water was introduced from the upper washing water inflow pipe 14.
The float 13 receives pressure from the washing water, and the upper porous plate 4 descends to compress and wash the sponge filter medium 6.

FIG. 5 further shows another embodiment of the present invention,
The positions of the raw water inflow pipe 8 and the treated water outflow pipe 10 of the example shown in the third figure are reversed to perform downward flow filtration, and _V4 indicates the raw water inflow valve.

Therefore, during filtration, raw water passes through the upper perforated plate 4 and is filtered by the sponge filter medium 6 in a downward flow without applying pressure to the surface of the float 13, and the treated water is
The treated water flows out from the outflow pipe 10 via the direction switching valve _V1 . Also, when cleaning, use the 3-way switching valve as shown in Figure 6.
Switch V ₁ , close the raw water inflow valve V ₄ , and close the cleaning water inflow valve
V ₃ is opened and cleaning similar to the fourth illustrated example is performed.

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 simply by opening and closing the valve without the need to start or stop the pump, but filtration cannot be restarted. Immediately after, it is preferable to drain the treated water from the washing drain pipe 9 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...
...Float, 4...Upper perforated plate, 5...Stopper, 6...Sponge filter material, 7...Flatper, 8
... Raw water inflow pipe, 9 ... Washing drain pipe, 10 ... Treated water outflow pipe, 13 ... Float, 14 ... Washing water inflow pipe, V ₁ ... 3-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) A lower porous body is fixed to the lower part of a pressure filter tank, and an upper porous body connected to a float is placed in a floating state in the upper part, and between these upper and lower porous bodies, A sponge filter medium is filled, the float is provided with a pressure receiving plate that receives pressure from the downward flow of liquid, and a raw water inflow pipe is connected to either the lower part of the lower porous body or the upper floating limit position of the upper porous body to the other. A clarification filtration device characterized in that a treated water outflow pipe is opened, a washing water inflow pipe is opened in the upper part of the tank, and a washing water drainage pipe is opened in the lower part of the tank. (2) The float also serves as a pressure receiving plate, and the raw water inflow pipe or the treated water outflow pipe is opened between the float and the floating upper limit position of the upper porous body, Claim No. The clarifying filtration device according to item 1.