KR101466765B1 - Apparatus and method for discharging backwashing water of filter basin - Google Patents

Abstract

The present invention is characterized in that a separate auxiliary air supply pipe 10 is connected to the air supply pipe 5 of the rapid filter paper and the valve 1 13 and the auxiliary air supply pipe 10 are connected to the air supply pipe 5, The auxiliary air supply pipe 10 is connected to the air injection pipe 12 which is connected to the inside of the outer wall 2 of the filter paper through the side wall 16 and fixed to the outer wall of the filter paper, Lt; / RTI >
The air injection port 12 is formed with an air injection port 11 and the air injection port 11 is formed into a circular or slit shape. When the air injection port 11 is circular, the diameter is 3 to 15 mm and the interval is 5 to 25 cm And the air jet opening 11 is provided at a lower level than the level of the filter paper, that is, the height of the inner wall 1, preferably at a lower level of 5 to 15 cm. The backwashing water is discharged to the outside of the filter paper.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for discharging backwash water from a filter paper,

The present invention relates to a method for easily discharging backwash water containing contaminants such as sludge, which is a foreign substance by backwash, into a dehydrator when a backwashing process is performed in a filter paper such as a water purification plant and a sewage treatment plant, And more particularly, to a method and apparatus capable of easily discharging contaminated backwash water by the pressure of air without using a trough or using raw water.

Generally, in a water purification plant or a sewage treatment plant, a filtration process is performed before the disinfection process in the final treatment stage, and it is well known in the art to use a strainer block type filter paper for the filtration process.

When the raw water flows into the upper portion of the filter paper, the filtration water passes through the filtration layer, and mainly suspended substances are removed, and the filtered purified water is collected through a strainer block through a water pipe to be purified water.

If the filtration ability of the filtration layer is deteriorated due to the adhesion of the suspended material to the filtration media as the filtration action is repeated, the filter material is washed through the backwashing process.

Such a backwashing process is classified as a backwash process (water washing) by backwash water or a backwash process (handwashing) in which backwash air and backwash water are mixed, but the latter, which is superior in terms of backwash efficiency, Choosing is popular.

In the first step, the filter medium and the contaminants are peeled off by the micro-vibration by the backwashing air, and the air and the backwash water are supplied in the second step to further separate the filter material and the contaminant. And a multistage process for removing and cleaning separated contaminants.

As a method for discharging the backwash water containing the pollutants by the three steps of the backwashing process, a separate drainage hole was installed to discharge the backwash water to the top, but the outer wall The backwash water containing the contaminant on the side 2) can not be used as the drainage water and vortexing phenomenon occurs, so that rapid and uniform discharge can not be performed. Therefore, the backwash water containing contaminants continues to be discharged until the drain water is completely drained. There is a problem that the purified water is wasted.

Therefore, in order to improve this, the raw water is supplied to the opposite side of the discharge port through the raw water supply unit to discharge the contaminated backwash water on the opposite side of the discharge water outlet to the discharge port by the water pressure of the raw water (refer to Korean Utility Model Publication No. 1997-020970) The waste water of the waste water is unnecessarily wasted and the water pressure of the waste water is low so that the contaminated backwash water can not be discharged quickly and the backwash water and waste water are wasted due to the low efficiency.

Further, a filter paper provided with a trough for draining contaminated backwash water on the top of the filter paper has been proposed.

In order to solve this problem, there is a problem in that the filter paper having the improved structure of the filter has a problem in that the filtration paper having the above-mentioned troughs has a problem in that the cross-sectional area of the trough is narrowed, (Registered Patent No. 10-0420376, No. 10-0544829, Registration Utility Model No. 20-0251845).

However, the above-mentioned filter paper requires an extra cost to install the filter separately, is complicated in configuration, and still fails to completely solve the problem of filter media leakage.

In order to solve the above-mentioned problems, the present invention eliminates the waste of washing water, raw water, and filter media, eliminates the need for separate troughs, simplifies the construction thereof, And a method and an apparatus for easily discharging the backwash water containing the water.

According to an aspect of the present invention, there is provided a strainer block type filter paper comprising a conventional water backwash device, a separate auxiliary air supply pipe connected to the air supply device, The present invention is directed to a method and an apparatus for supplying air to a plurality of air injection holes provided in a spray tube and discharging backwash water containing contaminants by the air pressure to a water outlet.

1, the rapid filter paper is formed on both sides by the inner and outer walls 1 and 2, and a discharge port 3 is formed at the center of the filter paper. In the filter paper 4, And an air inlet pipe 5 and a water purification valve 6 disposed at the center of the water collecting chamber 7 and a lower portion separated from the water discharge port 3, As shown in Fig.

The filtration method in the rapid filter paper is such that the raw water is uniformly introduced into the upper layer of the filter material layer 4 in the filtration area through the raw water distributor 8 and adhered to the filter material mainly through the filtration material layer, Remove the material.

 As the filtration process of the rapid filter paper progresses, the contaminant accumulates in the filter material layer, and when the filtration efficiency decreases, the level of the raw water in the filter paper increases. When reaching a certain level, filtration is stopped and backwashing is performed.

In the backwashing process, as described above, the backwash air is strongly supplied to the air supply pipe (5) to separate the suspended substances and the like attached to the filter paper of the filter material layer in the first stage, and then, through the air supply pipe and the water purification valve The backwash air and the backwash water are supplied at the same time to further disperse the suspended material separated in the filtration step in the second step process and finally the impurities such as the suspended substances separated in the filtration material layer in the third step process are cleaned with the backwashing water, (3).

In the conventional three-step process, the raw water is supplied to the raw water distributor 8, and the backwash water containing the suspended substances floated above the filter paper is pushed out to the drainage port by the pressure of the raw water (see FIG. 2) And the water pressure of the raw water is low. Therefore, it takes much time to discharge the backwash water containing the pollutant, and thus the backwashing time is prolonged, resulting in a problem of waste of backwash water. The present invention has been completed through a lot of research and experiments.

Therefore, in order to quickly discharge the backwash water containing contaminants in the conventional backwashing three-step process, the auxiliary air supply pipe 10 is installed in the air supply pipe, 11, the backwash water containing contaminants is quickly discharged to the discharge port by the pressure of the air, thereby improving the backwashing efficiency, thereby reducing the amount of backwash water and raw water, It is an economical and useful invention.

The present invention uses a conventional backwashing air supply device without the need for a separate air supply device and discharges backwash water containing contaminants using the air pressure, thereby improving the backwashing efficiency and shortening the backwashing time And it is possible to save the use of backwash water and raw water, and it is possible to discharge the backwash water containing contaminants in a very simple and economical manner as there is no need to install a trough.

1 is a cross-sectional view of a common rapid filter paper.
Fig. 2 is a discharge flow chart of backwash water containing conventional pollutants. Fig.
3 is an installation cross-sectional view of the present invention.
4 is a cross-sectional view taken along line AA of FIG. 3 of the present invention;
5 is a front view of the air injection tube of the present invention.
6 is another embodiment of the air injection tube of the present invention.

Hereinafter, a method and apparatus for discharging backwash water containing pollutants of the present invention will be described in detail with reference to the drawings.

The rapid filter paper of the present invention is not particularly limited in its construction, and can be used in conventional filter paper in which backwashing is used.

FIGS. 3 and 4 are cross-sectional views illustrating the installation of an auxiliary air supply pipe and an air injection pipe according to the present invention.

Figures 5 and 6 relate to the configuration of the air injection port of the air injection pipe.

4, a separate auxiliary air supply pipe 10 is connected to the air supply pipe 5 of the conventional rapid filtering paper, and the air supply pipe 5 is connected to the valve 1 (13) and the auxiliary air supply pipe 10 The valve 2 14 and the air pressure control safety valve 15 are installed.

3, the auxiliary air supply pipe 10 is connected to the air injection pipe 12, which is connected to the inside of the outer wall 2 of the filter paper through the side wall 16 and is fixed to the outer wall of the filter paper by the length of the filter paper, do.

The air injection port 12 is formed with an air injection port 11 and the air injection port 11 is formed into a circular or slit shape. When the air injection port 11 is circular, the diameter is 3 to 15 mm and the interval is 5 to 25 cm , And a length of 5 to 20 cm in a width of 1 to 10 mm in the case of a slit shape, and it is a matter of course that it is possible to adjust the size according to the size of the filter paper in the person skilled in the art.

In order to inject air at a constant pressure, the air injection pipe (12) and the air injection hole (11) have a cross section in which the diameter of the air injection pipe is reduced from the inlet to the end, (Refer to Korean Patent No. 10-0530613 of the present inventor), a configuration in which the diameter of the front and rear of the air injection tube is the same and the diameter of the air injection port is changed (see the present invention's patent No. 10-1115311) The cross sectional area of the air injection pipe may be set to be 2 to 5 times larger than the sum of the total cross sectional area of the air injection hole while using pipes having the same diameter.

With this configuration, the air can be injected at a constant pressure to uniformly discharge contaminants.

Further, it is preferable that the air jet opening 11 is provided below the water level of the filter paper, that is, below the height of the inner wall 1, and 5 to 15 cm below.

If the value falls outside the lower limit of the above-mentioned range, the air is excessively pressurized to blow air over the water surface, and if it exceeds the upper limit value, the air pressure is lowered and the discharge ability of the pollutant-containing backwash water is lowered.

The safety valve 15 for controlling the air pressure is for controlling the backwashing of the backwashing air blowing pump (not shown) to be higher than the pressure of the air blowing pipe 12.

The backwashing method according to the present invention will be described in detail.

The raw water flowing into the upper portion of the filter medium layer 4 through the raw water inlet 9 of the raw water distributor 8 passes through the filter medium layer 4 by gravity and is filtered.

In this process, contaminants contained in the raw water are filtered by the filter medium layer 4.

The raw water sequentially passes through each of the subfilter layers constituting the filter medium layer 4 and collects in the lower water collecting chamber 7 and is discharged to the water collecting chamber (not shown) through the central water purification valve 6.

As the filtration process proceeds for a certain period of time, contaminants accumulate in the filtration layer, resulting in lower filtration efficiency and a rise in the level of the filter paper. When the raw water reaches a certain level, the supply of raw water is stopped, and the filtration process is stopped and backwashing is performed.

In the backwashing process, the air supply pump (not shown) is operated in one step and the valve 1 (13) of the air supply pipe (5) is opened to supply air to the pressure chamber (7) The backwash air is passed through the filter medium layer through a strainer (not shown, refer to the applicant's patent application No. 29058, filed on the applicant's patent application No. 29058, entitled "Filter strainer") attached to the strainer block, Or the deposited contaminants are removed from the filter media.

After the first step process, the backwash water (using purified water) is supplied to the filter material layer through the strainer at the same time with the air through the backwash valve (purified water valve) (6) - Perform backwash with water.

The backwashing valve 6 serves as a backwashing valve for backwashing. When the backwashing valve 6 is used as a backwashing valve, And the backwash pipe valve is opened when the backwash pipe valve and the purified water pipe valve are backwashed by the separate backwash pipe valve and the purified water pipe valve. The purified water pipe valve is closed and the backwash water is supplied through the backwash valve. On the contrary, Which is known in the art, so that the illustration and the process thereof are omitted.

By the second step process, the pollutant which is not separated or separated in the first step is separated from the filter medium and washed.

When the second step process is completed, the valve 1 (13) of the air supply pipe is closed while the backwash water is continuously supplied, and the valve 2 (14) of the auxiliary air supply pipe is opened to supply air to the auxiliary air injection pipe (10).

At this time, contaminants such as contaminants separated from the filter medium layer 4 float in the water surface direction together with the flow of backwash water.

The contaminants that float on the water surface are flowed in the direction of the central discharge port 3 by the pressure of the air jetted from the air injection port 11 of the air supply pipe 12 to flow through the discharge port 3 ).

 At this time, the drain valve (not shown) of the drain outlet 3 is kept open.

During the backwashing process, the supply of raw water is stopped to prevent the waste of raw water.

When this backwash is complete, close valve 2 (14) and drain valve, stop backwash water supply and restart valve 1 (13) and raw water supply valve to restart the filtration process.

By the process of the present invention, the backwash water containing contaminants can be rapidly discharged by the pressure of the air during the backwashing, thereby improving the backwashing efficiency without using the raw water, thereby saving the raw water and the backwash water. The back washing time can be shortened and the cost can be reduced.

The present invention can be applied to all backwashing apparatuses other than the above-described embodiments. In particular, the present invention can be applied to filter paper provided with troughs.

That is, the same purpose and effect can be achieved by removing the troughs of the filter paper provided with the troughs, forming the structure of the central inner wall 1 at the same height, and providing the air injection tube of the present invention at the outer wall side.

 By virtue of such a constitution, there is no need to provide a trapezoid, so that the structure is simplified, loss of the filter material can be prevented, and economical backwashing is possible.

The above-described pollutant-containing backwash water discharging method and apparatus are not limited to the configuration and method of the embodiments described above, but the embodiments may be modified so that all or part of the embodiments may be selectively And may be configured in combination.

1: inner wall, 2: outer wall, 3: drainage hole, 4: filter medium layer, 5: air supply pipe, 6: water purification valve, 7: water chamber, Wherein the air inlet is provided at a side wall of the valve body so as to communicate with the valve body.

Claims (6)

A method for discharging contaminated backwash water from a filter paper,
A separate auxiliary air supply pipe 10 is connected to the backwash air supply pipe 5 and an air blown through the side wall 16 to the inside of the outer wall 2 of the filter paper through the auxiliary air supply pipe, Wherein the air is supplied to a plurality of air injection openings (11) provided in the capillary tube (12), and the backwash water contaminated by the air pressure is discharged to the deballhouse (3) Discharge method. The method according to claim 1,
Wherein the air jet opening (11) is formed in a circular shape and has a diameter of 3 to 15 mm and an interval of 5 to 25 cm. The method according to claim 1,
The air jet opening (11) is formed in a slit shape and has a width of 1 to 10 mm and a length of 5 to 20 cm. The method according to claim 1,
Wherein the air ejection port (11) is installed on the outer wall (2) and is located 5 to 15 cm below the height of the inner wall (1). The method according to claim 1,
Wherein the cross sectional area of the air injection pipe (12) is 2 to 5 times the sum of the cross sectional areas of the air injection port (11). A separate auxiliary air supply pipe 10 is connected to the backwash air supply pipe 5 of the quick filter paper and the valve 1 13 is connected to the air supply pipe 5 and the valve 2 14 is connected to the auxiliary air supply pipe 10, A safety valve 15 is installed and the air supply pipe 10 is connected in a T shape to the inside of the outer wall 2 of the filter paper through the side wall 16 and fixed to the outer wall of the filter paper, And an air injection port (11) formed in the air injection pipe (12).

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