JP3198496B2 - Method and apparatus for cleaning filter media in filtration machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning and regenerating a filter medium using a floating filter medium when the filter medium is clogged, and an improvement of the apparatus.

[0002]

2. Description of the Related Art Conventionally, a filter using such a floating filter medium is disclosed in, for example, Japanese Patent Publication No. 22682/1990.
In the present invention, in order to wash and regenerate when the filter medium is clogged,
After the supply of the undiluted solution is stopped and the filter medium clogged with the stirring blade is stirred and dispersed to separate and settle the clogged impurities, the settled impurities are removed together with the contaminated water so as not to lose the filter medium. . If the filter medium cannot be completely washed only by the amount of water in the tank, the washing water is supplied from the filtrate take-out section to flush away the contaminated water.

[0003]

In the conventional cleaning method as described above, stirring and regenerating a clogged filter medium are performed by stirring. Since each operation such as washing is separately performed, it takes time, and a great amount of energy is required for stirring the filter medium, supplying washing water, and the like, and the filtration effect is poor. That is, during the time required for stirring the filter medium, injecting the washing water, and draining the polluted water, the filtration is stopped, and during this time, the energy that does not contribute to the filtration, such as the stirring power and the cleaning water supply power, is also used. Has been consumed.

[0004]

According to the present invention, as described above, the operation time of the filter which has conventionally been separately performed is repeatedly set, so that the operation time is greatly reduced and the operation is repeated. The operating energies overlap to exert a synergistic effect, thereby saving energy consumption.

[0005] That is, the gist of the present invention is to provide a filter in which a floating filter medium is filled in a closed tank and to clean and regenerate the clogged floating filter medium .
The agitating impeller provided at the bottom of the tank agitates the floating filter medium and simultaneously injects washing water into the agitated and dispersed floating filter medium. The washing water to be injected may be a downward flow from the upper part to the lower part of the closed tank, or a swirling flow along the inner peripheral surface of the closed tank.

[0006] As an apparatus for performing the above-described operation , a floating filter medium is sealed in a cylindrical closed tank, and a stirring impeller and a raw water supply pipe are provided at the bottom of the closed tank. A switching valve provided in the supply line of raw water by opening the filtrate extraction pipe and the washing water pipe.
A switching valve provided in the washing water pipe is linked to a drive motor of the stirring impeller , and when the filter medium is washed, the drive motor is started and at the same time the switching valve provided in the washing water pipe is opened. , The switching valve provided in the raw water supply line closes
You. Then, when the drive motor is stopped ,
Switching valve closed, switching valve provided in raw water supply line
Is to open .

[0007]

In other words, according to the present invention, in order to stir the clogged filter medium, washing water is injected at the same time that the stirring impeller is driven, so that the washing water accelerates the stirring water flow by the stirring impeller and disturbs it. Since the washing water is injected into the scattered filter medium, the wash water collides with the dispersed filter medium, and the clogging substances attached to the filter medium can be efficiently removed.

Further, as described above, the washing water can increase the speed of the stirring water caused by the rotation of the stirring impeller, so that the power for stirring can be reduced. Since the polymerization is performed, the time required for the polymerization is polymerized, and the operation rate as a filter can be increased as compared with the conventional method in which these are separately performed. The amount of water in the closed tank corresponding to the washing water injected during the stirring is appropriately discharged. At this time, it is needless to say that the filter medium is prevented from flowing out by a screen or the like. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0009]

DETAILED DESCRIPTION FIG. 1, Ri flowsheet diagram der filtration apparatus according to the present invention, the floating filter medium 2 is constituted by foamed styrol sealed tightly closed tank 1, the drive motor M on the bottom of the closed tank 1 The driven impeller 3 is installed, and a raw water supply pipe 4 and a polluted water drain pipe 5 are opened at the bottom,
An outlet pipe 6 and a washing water pipe 7 for treated water (filtrate) are opened at the top of the closed tank 1. In the drawing, reference numeral 8 denotes a screen for collecting water, and in FIG. 1, the drainage pipe 5 of the polluted water rises in a U-shape with respect to the closed tank 1 so that the filter medium flows out at the time of drainage. the is to prevent you, emerged filter material
Raw water is used to wash 2. Symbol in FIG.
Reference numerals 9 and 10 denote switching valves for cleaning the floating medium 2
In this case, the switching valve 10 is closed and the switching valve 9 is opened.
I let go.

Although not shown, these switching valves 9 and 10 are linked to the drive motor M of the stirring impeller 3, and when the drive motor M is started, the switching valve 10 is closed. And the switching valve 9 opens,
The driving motor M to that the changeover valve 9 is closed stops, are as switching valve 10 is opened.

[0011] In the filtration device constructed as described above, to wash play floating filter medium 2 was clogged, the changeover valve 1
0 is closed and the switching valve 9 is opened to start the drive motor M. In this way, the floating filter medium 2 clogged by the stirring impeller 3 is stirred and dispersed, and at the same time, the raw water is poured into the floating filter medium 2 where the raw water is stirred and dispersed as washing water from the washing water pipe 7, and the surface of the dispersed filter medium 2 Washing and peeling can be performed up to clogging. Then,夾miscellaneous precipitated is a closed tank 1 bottom being peeled can and score takeout outside the tank together with the polluted water from the drain pipe 5 of polluted water. At this time, it is needless to say that the floating filter medium 2 is prevented from flowing out from the opening of the drainage pipe 5 of the polluted water.

In the washing and regenerating operation when the filter medium is clogged, according to the present invention, the agitation of the filter medium and the washing operation are performed at the same time. There is enhanced, it is possible to strongly peel off the夾miscellaneous <br/> substance attached to the filter media. In addition, by repeating the stirring operation and the washing operation, the washing and regenerating operation of the filter medium can be performed at the same time, so that the operation time is longer than in the conventional case where the stirring and the washing of the filter medium are performed separately. It can be shortened to width.

FIG . 2 is a diagram showing the above situation, in which the vertical axis represents the concentration of the cleaning wastewater and the horizontal axis represents the cleaning time (number of times).
Has taken. In the figure, a curve a shown by a chain line is obtained by using the cleaning method according to the present invention, and a solid curve is obtained by cleaning by the conventional method using the same apparatus.

According to the chart of FIG . 2 , one cleaning by the method according to the present invention is performed three times by the conventional method (b).
1, b2, b3) The concentration of the washing wastewater after the repetition is obtained (see the imaginary line C). Also, since the washing time is one washing, the washing time is 1/4 (T1
To T4). This indicates that strong washing can be performed by simultaneous washing with stirring, and that the stirring power used for washing, the pump power for washing water injection, and the amount of washing water can be significantly reduced.

[0015]

As is apparent from the above description, the present invention provides a filter using a floating filter medium which is capable of cleaning and regenerating clogged filter medium as compared with a conventional filter of this type. The cleaning time has been greatly reduced, and the driving power of the agitator and the cleaning water pump has been greatly reduced. Naturally, no special equipment is required for cleaning. The benefits gained by operating a filter using PF are significant.

[Brief description of the drawings]

FIG. 1 is a flow sheet diagram schematically showing the operation of a filter according to the present invention.

FIG. 2 is a chart for explaining the effect of cleaning a filter medium when the method according to the present invention is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed tank 2 Floating filter medium 3 Stirrer impeller 4 Raw water supply pipe 5 Dirty water drain pipe 6 Filtrate take-out pipe 7 Washing water pipe M Drive motor 9 Switching valve 10 Switching valve

Claims (3)

(57) [Claims] 1. A closed tank (1) filtration machine using floating filter medium (2) into, per clogged floating filter medium (2) to be cleaned reproduction, stirring blade provided in the sealed tank (1) bottom the method of cleaning filter media in the filtration unit to feature to inject cleaning water toward the top to bottom in the car (3) in floating filter media (2) stirring the the floating filter medium stirring dispersion simultaneously (2). Wherein the sealed tank the floating filter medium (2) (1)
The bottom is provided with stirring blade wheel (3) washing the filter media in the filtration apparatus of claim 1, feature to inject a swirling flow at the same time washing water and stirred in the dispersed floating filter medium (2) in Method. 3. A floating filter medium in a cylindrical closed tank (1) .
With encapsulating (2), stirring impeller at the bottom of the closed tank (1) (3) and the raw water supply pipe (4) provided in the upper part of the closed tank (1), take-out pipe of the filtrate (6 ) And wash water pipe
(7) is opened and provided in the raw water supply pipe (4).
Switching valve (10) and switching provided in the washing water pipe (7)
A valve (9) and a drive motor for the stirring impeller (3)
(M) is linked to the drive motor for cleaning the filter media.
(M) is started, the switching valve (9) is opened , the switching valve (10) is closed, and the drive motor (M) is started.
Is stopped, the switching valve (9) closes and the switching valve
Lube (10) cleaning devices filter media in the filtration unit to feature that was made to open.