JPS62221406A - Fixed bed horizontal flow type filter - Google Patents

Abstract

PURPOSE:To obtain the titled equipment wherein it has a compact structure and filtered water quality is enhanced and amount of drainage after washing is minimized by combing a horizontal flow filtration system and a fixed bed backflow system. CONSTITUTION:In a filtration process, raw water is allowed to flow in the horizontal direction through a raw water chamber 6 which is space formed by a tank body 1 and an outer supporting wall 2 and filtered in a filter chamber 7 which is space formed by the outer supporting wall 2, an inner supporting wall 3 and a supporting bed 5 and collected in both an outer catchment chamber 10 which is space formed by the inner supporting wall 3 and a catchment wall 4 and an inner catchment chamber 11 which s space of the inside of the catchment wall 4 and taken out to the outside of the system as clarified water. After performing filtration for definite time, filtration is interrupted to be shifted to a washing process. In the washing process, air and clarified water are allowed to flow through a washing water chamber 12 which is space formed by the tank 1 and the supporting bed 5 and filter sand 9 being a filter medium is washed and its drainage is collected in a drainage chamber 13 which is space formed by the tank 1 and the top surface of filter sand 9 and taken out to the outside of the system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for filtering a suspended liquid to obtain clear water.

[Conventional technology]

As a means to obtain clear water by filtering, Patent No. 155.75
6, and in recent years, representative examples include Japanese Patent Publication No. 48-20070 and Japanese Patent Publication No. 51-34587. What these have in common is as follows.

■ An outer wall, an inner wall, and a water collection chamber inside the inner wall are provided concentrically in the tank, and a filter material is filled in the space between the outer wall and the inner wall, so that suspended water is filtered in a horizontal flow.

■ The filled filter media descends and rises in the pipe line in the water collection chamber horizontally or by air, and the filter media in the filter media layer moves downward.

■ Openings are provided in the outer and inner walls to allow contaminated water and clear water to pass through, while supporting the material forming the filter layer.

■ The filter media that has risen in the pipe either rolls down a chute below the pipe outlet or directly settles in water onto the upper surface of the filter media layer. Due to the rolling action of the filter medium, there is a tendency for the distribution to be divided into coarse particles and fine particles.

■ Suspended matter (including large and small contaminants) captured by the filter media is removed from the ice surface and out of the system. In particular, some are equipped with gnarled overflow gutters that have a rectifying effect.

From these explanations, the following can be understood.

By passing water across the filter media layer, the filter media can trap suspended matter and obtain clear water. This operation involves separating suspended matter from sand and removing it while circulating through the filter media.

[Problem that the invention seeks to solve]

These filtration devices have the advantage of being able to handle a large amount of water per installed area, and because they perform filtration and cleaning at the same time and only use air as the cleaning source, they do not require a cleaning water tank or a cleaning pump, making the device compact. ing. However, as described above, since filtration and washing are performed simultaneously, it is necessary to reduce the quality of filtrate water and to improve separation of filtrate water and washing wastewater, the amount of washing wastewater needs to be about 10% of the raw water inflow.

Therefore, an object of the present invention is to provide a filtration device that has a compact structure, improves the quality of filtrated water, and suppresses the amount of washing wastewater to about 3% when the raw water is suspended water at the level of secondary treated sewage water.

[Means for solving problems]

In order to achieve this objective, the present invention is characterized by a combination of a horizontal flow filtration system and a fixed bed backflow system, which are conventional technologies.

That is, an outer support wall and an inner support wall through which water can pass into the tank, and a support bed perpendicular to the support wall are provided in the lower part of the tank, and a filter material is filled between these walls and the bed. Further walls are installed inward of the inner support wall to form a raw water chamber, a filtration chamber, an external water collection chamber, and an inner water chamber from the tank body side, and a washing water chamber between the lower part of the tank and the support floor. Configure. On the other hand, a washing and draining chamber is formed between the upper surface of the filter medium and the tank.

In this device configuration, the filtration process and the washing process are performed separately. In other words, in the filtration process, raw water flows horizontally from the raw water chamber, is filtered in the filtration chamber, is collected in the outer and inner water chambers, and is taken out of the system as clear water. After filtration for a certain period of time, filtration is interrupted and the process begins with a cleaning process.

In the cleaning process, air and clear water are flowed in from the cleaning water chamber at the bottom of the tank to clean the filter media, and the waste water is collected in the cleaning and drainage chamber at the top of the tank and taken out of the system.

The above is realized by the configuration of this device.

〔Example〕

FIG. 1 shows a schematic configuration of the present invention.

The tank body 1 may be cylindrical or polygonal, and an outer support wall 2, an inner support wall 3, and a water collecting wall 4 are provided in the tank 1 substantially concentrically.

A support floor 5 is provided below the inner support wall 3. tank body 1
The space formed by the outer support wall 2 and the outer support wall 2 is the raw water chamber 6, and the space formed by the outer support wall 2, the inner support wall 3, and the support bed 5 is the filtration chamber 7. The lower part is filled with support gravel 8, and the upper part is filled with a filter medium. A certain filter sand 9 is filled. The space formed by the inner support wall 3 and the water collection wall 4 is defined as an outer water collection chamber 10, and is defined as a water collection chamber 11 in the space inside the water collection wall 4.

The space formed by the tank 1 and the support floor 5 is defined as a wash water chamber 12.

The space formed by the tank 1 and the upper surface of the filter sand 9 is defined as a washing and draining chamber 13.

For each piping to the tank, a raw water pipe 14 is provided below the tank 1 to communicate with the raw water chamber 6 in order to supply suspended water to the raw water chamber 6, and a raw water pipe 14 is provided below the tank 1 in communication with the raw water chamber 6, and an inner water chamber 11 is provided in order to take clear water out of the system. A filtration water pipe 15 is provided above the tank 1 in communication with the tank 1, and air is used for air cleaning to loosen the filter sand 9 and promote separation of the filter sand 9 and suspended matter before cleaning with clear water. An air pipe 16 is provided below the tank 1 in communication with the washing water chamber 12 in order to supply the washing water chamber 12 with clear water for cleaning the filter medium. A cleaning water pipe 17 is provided below the tank 1, and a drainage pipe is installed 100 to 200 m above the bottom of the cleaning drainage chamber 13 to drain water from the cleaning drainage chamber 13 before cleaning in order to suppress the expansion of the lumber during cleaning. 18 is provided above the tank 1 in communication with the washing and draining chamber,
An air vent pipe 19 is provided above the tank 1 to communicate with the cleaning drainage chamber 13 during cleaning with air, and a cleaning drainage pipe 20 is provided above the tank 1 to exhaust air from the cleaning drainage chamber 13 during cleaning with clear water. It is provided above the tank 1 in communication with the chamber.

The peripheral structure of the filtration chamber 7 will be described in detail with reference to FIGS.

The outer support wall 2 is provided with a plurality of parts as shown in FIGS. 2 and 3, each consisting of a clapboard 21, a hole 22, and a check valve 23 for preventing backflow of material during cleaning. The check valve 23 portion may utilize a spring mechanism or rubber elasticity.

A clapboard 21 with an arc-shaped or folded plate-shaped cross section serves as a filtration chamber 7.
The hole 21 and the check valve 23 are provided above the horizontal line 25 that contacts the lower end 24 so that the mechanism of the check valve 23 by the filter medium 9 cannot be prevented.

FIG. 3 shows a cross section of the inner support wall 3. The filtration chamber 7 is filled with filter sand 9 and is separated from the outer water collection chamber 10 by the inner support wall 3.
It is desirable to have a configuration in which filter sand 9 does not pass through inner support wall 3, but only clear water passes through it. In the present invention, the void 27 on the outer surface 26 is made smaller and the void 29 on the inner surface 28 is shown in FIG. 3 as an embodiment.
An example of a bar screen in which each cross section is approximately triangular in size is illustrated. As another example, the inner support wall 3 may be formed of porous ceramic. When the inner support wall 3 is subjected to vibrations caused by a motor or ultrasonic waves, the possibility of clogging of the inner support wall 3 with the filter medium can be avoided.

FIG. 4 shows the vicinity of the suspension water supply, and FIG. 5 shows the vicinity of the opposite side to the center of the tank 1 in FIG.

A suspension water supply pipe 14 is provided in the tank 1 so that the suspension water enters the raw water chamber 6. The body plate 30 is parallel to the inner surface of the tank 1.
are provided, and a plate 31 connects them to form a space 32. The lower end 33 of the space 32 is open to the raw water chamber 6, but a plate 34 is provided only near the raw water pipe 14 to ensure uniform flow to the opposing position 35.

Note that if the cross-sectional area of the space 32 increases as it goes from the raw water pipe 14 to the opposing position 35, the pressure and flow velocity inside the raw water chamber 6 will be uniform.

FIG. 6 shows the washing water supply section 3 from the washing water chamber 12 to the filtration chamber 7.
6 is shown. The wash water supply section 36 includes a hole 37, a pipe 38, and a conical umbrella 39. The lower end 40 of the umbrella 39 is the upper end 41 of the tube
Support gravel 8 is placed in the pipe 38 so that it is located at a lower position.
A space 42 is formed so that no particles can enter. A plurality of washing water supply units 30 are provided on the support bed 5.

As another example, the cleaning water supply section 30 may be formed of porous ceramic or a porous pipe.

The filtration step and the washing step will be explained with reference to FIGS. 1 to 6.

Suspended water enters the space 32 through the raw water pipe 14 and reaches the lower end 33
The raw water chamber 6 is filled with uniform flow rate and pressure.

The suspended water that has passed through the holes 22 in the outer support wall 2 is rectified by the clapboard 21 and enters the filtration chamber 7. Suspended matter is removed while passing through the filter medium 9 of the filtration chamber 7, and the clear water flows into the void 27 of the inner support wall 3.
29 and reaches the external water collection chamber 10. It descends through the outer water collection chamber 10, reaches the inner water collection chamber 11, rises, and is taken out from the filtration water pipe 15.

Next, the cleaning process will be explained.

After the filter sand 9 captures a certain amount of suspended matter, the filter sand 9 is washed.

First, after draining water from the washing and draining chamber 13 through the drain pipe 18, approximately 1 rrr/rrrmin is drained from the air pipe 16.
Air is sent into the wash water chamber 12 at a flow rate of . Air passes from the wash water chamber 12 through the hole 37 and the pipe 38, is rectified by the umbrella 39, and reaches the supporting gravel 8. Next, the filter medium 8 is reached, after which the filter medium and suspended matter are separated and the filter medium is loosened, the cleaning and drainage chamber 1 is reached.
3, and the yarn comes out from the air vent tube 19.

Next, approximately 0.7 rd/n? from the washing water pipe 17. mi
Clear water is fed into the wash water chamber 12 at a flow rate of n. Clear water passes from the wash water chamber 12 through a hole 37 and a pipe 38, is rectified by an umbrella 39, and reaches the support gravel 8. Next, it reaches the filter sand 9, and while entraining the separated suspended matter in the filter sand 9, it reaches the washing drain chamber 13, and exits from the system through the washing drain pipe.

〔Effect of the invention〕

Since the filtration device of the present invention uses a horizontal flow filtration method, a large throughput per installation area can be obtained.

On the other hand, since filtration and washing are performed separately, the quality of filtrate water is improved and the amount of washing water is reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a detailed view showing a cross section of the hole in the outer support wall 2, FIG. 3 is a detailed view showing a cross section of the inner support wall 3, and FIG. 5 is a detailed view showing a cross section of the polluted water supply port, FIG. 5 is a detailed view showing a cross section of a portion opposite to FIG. 4, and FIG. 6 is a detailed view showing a cross section of the wash water supply section 36. Agent Patent Attorney Taka Ishibashi Ma Fig. 1 Fig. 2 Fig. 3 Fig. 28: Inner surface 31: Board Fig. 6

Claims (1)

[Claims] 1. Inside the vertical tank, install an outer support wall, an inner support wall, an outer water collection wall, and an inner water collection wall concentrically from the outside to the inside, and use the space between the tank and the outer surface of the outer support wall to collect raw water. The space formed by the outer support wall and the inner support wall is used as a filtration chamber and is filled with filter media.
In a filtration device in which the space formed by the inner support wall and the water collection wall is the outer water collection chamber, and the inner surface of the water collection wall is the inner water collection chamber, the washing water chamber is formed at the lower part of the tank perpendicular to the support wall. A fixed bed horizontal flow filtration device characterized by having a supporting bed and a washing and draining chamber above the tank.