JP2536318B2 - Method for cleaning filter media in a filter using floating filter media - Google Patents

Description

Detailed Description of the Invention

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a method for cleaning a filter medium in a filter using a lightweight granular filter medium such as styrofoam, which is capable of cleaning and regenerating the filter medium in a short time without stopping the supply of raw water. The purpose of the present invention is to provide a cleaning method that can be performed.

[0002]

2. Description of the Related Art As a method of cleaning a filter medium in a filter using this type of conventional floating filter medium, Japanese Patent Laid-Open No. 63-185 has been proposed.
There is 416. With this product, in order to wash the clogged filter medium, the raw water supply is stopped, the filter medium is mechanically agitated to loosen the filter medium, then part of the wastewater is discharged, and then the raw water is stored in the tank. And stirred again,
It discharges dirty water.

[0003]

That is, in the above-mentioned prior art, when cleaning the filter medium, the supply of the undiluted solution is stopped to wash a part of the filter medium, and then the undiluted solution is supplied to clean the entire filter medium. Since the cleaning is performed, it takes a long time to perform stirring and cleaning twice, and it takes a long time to discharge the cleaning wastewater and to inject the raw water to restart the operation. And
During this time, all filtration operations must be stopped.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to shorten the washing time that does not contribute to filtration when washing and regenerating a clogged filter medium in a filter using a floating filter medium.

That is, the main point is that the sealed tank
The top of the closed tank is filled with granular flotation filter media.
A nozzle for removing the filtrate is provided on the bottom, and the filter material is washed at the bottom of the nozzle.
In an upflow filter of raw water with a drainage outlet,
When washing the clogged filter medium, after stirring and dispersing the clogged filter medium, the raw water supply pipes embedded in the filter medium layer, which are provided in at least two upper and lower stages, eject the raw water into the dispersed filter medium to wash the filter medium. After that, it was taken out from the bottom of the waste water tank.

[0006]

According to the method of the present invention, since the raw water is used as the cleaning water for cleaning the filter medium, the supply of the raw water into the tank is not interrupted during the cleaning, and the filter medium and the filter medium are not interrupted. Only the dirty water is discharged while rinsing the washed and washed filter medium, and the tank is not emptied during this time. Therefore, the cleaning can be finished and the next filtration operation can be immediately started. That is, it is possible to wash the filter medium in a much shorter time as compared with the case where the inside of the tank is emptied twice while worrying about the outflow of the filter medium. The present invention will be specifically described below with reference to the drawings.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a closed tank, 2 is a partition plate, 3 is a water collecting nozzle mounted on the partition plate, 4 is a floating filter material layer, 5 is a filtrate reservoir, and 6 is a filtrate withdrawal pipe. , 7 is a pit for supplying raw water and discharging sewage, 7a is a raw water supply pipe, 7b is a sewage discharge pipe 8 is a stirring blade of a filter medium, 9 is a nozzle pipe for jetting raw water in the filter layer, Reference numeral 9a denotes a jet nozzle, and the nozzle tube 9 is a source tube 1 for the raw water in the illustrated example.
It is provided by branching from 1. In addition, reference numerals V1 to V5 indicate valves respectively provided in the above-mentioned respective pipelines.

In the filter constructed as described above, filtration and washing of the filter medium are performed as follows. That is, in the case of filtration work, the raw water from the supply pipe 11 is supplied to the valve V
3, it is sent to the tank 1 via the supply pipe 7a and the pit 7.
Then, while rising in the filter medium layer 4, the contained contaminants are captured, and the filtrate is taken out of the machine through the water collecting nozzle 3 and the take-out pipe 6.

When the filter medium is clogged during the above-described filtration operation, the valve V3 is closed to stop the stock solution from the pit 7, the valve V4 is opened and the valve V1 is opened.
And V2 are opened, and raw water is jetted into the filter medium layer 9. By doing so, the raw water is ejected from the ejection nozzle 9a, the clogging filter medium is expanded and dispersed, and the impurities are separated. Then, the heavy contaminants are washed away by the raw water that is subsequently supplied, settled, and discharged out of the machine through the pit 7 and the discharge pipe 7b .

That is, the present invention is characterized in that the filter medium and the contaminants are separated by the raw water, and the separated contaminants are placed on the raw water stream and drained. The filter medium is washed as compared with the conventional method. When this is done, the tank is not emptied and the filtration operation of the next stage after washing the filter medium can be started immediately.

In the above-mentioned case, the clogging filter medium layer is easily dispersed, but when the clogging is strong, the present invention can wash the filter medium using the following method. That is, the stirring blade 8 provided at the bottom of the closed tank 1
After stirring the filter material layer solidified by, dispersing the filter material and allowing it to stand still, it is placed in two layers above and below in the filter material layer as described above.
By ejecting the raw water from the nozzle 9a, heavy impurities are discharged to the outside of the machine and the raw water is used to filter the filter medium.
You can do it right away.

FIG. 2 shows the operating states of the valves and the stirring blades during the above-mentioned filtration work and cleaning of the filter medium. When the cleaning water is drained (when the valve V4 is open), the valves V1 and V2 are opened. However, the raw water is supplied to the closed tank 1 so that the closed tank is not emptied, and it is possible to immediately proceed to the filtration work of the next stage only by operating the valve.

[0013]

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, in a filter using a floating filter medium, when the filter medium is clogged, the filter medium can be washed and regenerated without draining the raw water in the filtration tank. When the conventional filter of this kind was used for cleaning the filter medium, the time to drain the raw water from the tank and supply it again was completely eliminated, and the operation rate of this filter was improved.
In particular, it is effective when it is used for treating discharged water, for example, without using filtered water.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional side view of a filtration device using a floating filter medium used in the present invention.

FIG. 2 is a table showing operating states of valves and agitating blades used in various parts when the filter according to the present invention is operated.

[Explanation of symbols]

 1 Closed tank 3 Nozzle 4 Filter layer 7 Pit 9 Nozzle tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-187908 (JP, A) JP-A-63-185415 (JP, A) Jikkouhei 1-443129 (JP, Y2)

Claims (1)

(57) [Claims] 1. A closed tank 1 is filled with a granular floating filter medium, a nozzle 3 for collecting filtrate is provided at the top of the closed tank 1, and a discharge port 7 for washing and draining the filter medium is provided at the lower bottom thereof. In the upflow filter of raw water, in washing the clogged filter medium, after stirring and dispersing the clogged filter medium,
Floating filter medium characterized in that raw water is jetted into the filter medium through at least two upper and lower raw water supply pipes embedded in the filter medium layer 4 to wash the filter medium, and then waste water is taken out from the lower bottom portion of the closed tank 1. A method for cleaning a filter medium in a filter using the.