JPH02277519A - Precoat filter - Google Patents

Abstract

PURPOSE:To improve working efficiency by providing the plate type filter cloth so as to be allowed to pull out in the direction to cross the movement of the raw water to be filtered. CONSTITUTION:After filter layer is formed, raw water is introduced from a water taking-in pipe G, and captured filthy substances into the filter layer E, and entered into a water collecting chamber B, and only the water treated with filtration is discharged from a discharge pipe H. Then, a water taking-in valve F is closed, and an air supply pipe (d) is connected to a compressed air pump, and an air supply valve I is opened to send compressed air gradually into a tank A. The compressed air fills the inside of the tank A to press the water down, and the water in the tank A is discharged from the tank A. When the water in the tank A is discharged and the water level is lowered under a lower plate (b), the air supply valve I is closed and the filter cloth (a) is taken out. By this method, the secondary pollution due to the washing of filter cloth is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application of Industry-H> The present invention relates to a precoat type filtration device using diatomaceous earth or the like.

<Prior Art> As one of the conventional filtration devices, there is a pre-coat type filtration device as shown in FIG.

The general structure of this precoat type filtration device is that a water collecting shaft 5 is installed inside a tank 1 of the main body of the device, and a disk-shaped filter cloth 2 is inserted and installed through this. At this time, the spacing between the filter cloths is rAit, and a ring-shaped spacer 6, which also serves as a packing, is installed at the same time.

First, a solution of diatomaceous earth is injected into the tank from the water intake pipe 4 using a pump, and the diatomaceous earth is deposited on the outer peripheral surface of the filter cloth to form the filter layer 3.

Next, the filtered raw water 7 is poured into the tank 1, the filth in the filtered raw water 7 is captured by the filter layer 3, and only the filtered water 8 is taken out from the water collection pipe 5.

<Problems to be Solved by the Present Invention> The conventional precoat type filtration device described above has the following problems.

The filter cloth layer 3 formed by precoating is compressed to the filter cloth 2 by the pump pressure during filtration operation, but it disappears when the filtration operation is stopped, and if the device is stopped for a long time, it will become stuck to the filter cloth 2 as shown in Figure 2. The filter layer 3 falls off.

If filtration operation is restarted in this state, filtration failure will occur.

Therefore, when the apparatus is stopped, it is necessary to pre-coat and recreate a new filter layer each time.

When removing diatomaceous earth adhering to a filter cloth, the conventional method has been to wash the filter cloth with a shower or the like, or to wash it away by flowing treated water etc. back through the water collection pipe 5.

However, the wastewater generated at this time contains very highly concentrated filth captured by the filter layer 3.

Therefore, in the conventional method, this wastewater had to be transferred to a sedimentation layer again for purification work, and then to be dewatered.

Therefore, problems arise in that work efficiency is significantly reduced and filtration costs are increased.

OBJECT OF THE INVENTION The present invention was made to solve the above-mentioned problems, and it does not generate waste water when regenerating filter cloth, improves the efficiency of filtration work, and provides a low-cost filtration system. The purpose is to provide

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to one drawing.

B. Structure of the filtration device of the invention (FIG. 3) The tank A of the main body of the device is open at the top and has a rectangular shape with a low profile, and the bottom is formed integrally with the outer peripheral wall surface.

At the bottom of tank A, install a horizontal low plate.

The low plate is a perforated plate made of punched metal or the like, and a support column k is provided protruding from the bottom of the tank to support it.

In the upper room partitioned by a low board, there is a water intake pipe G and an air supply pipe d.
is provided, and a fixing mechanism for fixing the filter cloth a and a door C for taking in and taking out the filter cloth a are provided.

In addition, a drain pipe H is provided in the water collection chamber B under the low plate.

Flanges α are provided at both ends of the outer peripheral wall surface of the filtration tank, allowing for attachment of the tank lid.

While being used to fix the filter, it is also possible to stack the filtration tanks A in several stages if necessary.

The filter cloth a is in the form of a plate, and can be selected from Saran or the like cut to match the shape of the low plate, reinforced with a stainless steel net, filter paper, resin filter, etc. as required.

The fixed aD has a handle m as shown in Fig. 4.

It consists of its rotation Mg and a filter cloth presser e.

The rotating shaft g is installed to penetrate the wall surface of the tank A.

A handle m is fixedly attached to the end of the rotating shaft g on the outside side of the tank, a cam n is fixed to the end on the inside side of the tank, and a filter cloth holder e is connected so as to be movable eccentrically with the rotation of the rotating shaft g.

As a result, the handle mt! : By rotating,
Via the rotating shaft e that interlocks with it, the rotational movement becomes vertical movement due to eccentric rotation, and the effect of pressing down the filter cloth can be expected.

How to use the device of the present invention> The filtration device of the present invention is used as follows.

<1> Filtration work (Figs. 3 to 7) ■Setting the filter cloth (I3!4 from Fig. 3) Open door c of the opening provided on the wall of filtration tank A, lower the filter cloth, and the filter Insert the filter cloth between the cloth retainers e, and fix the filter cloth with the fixing device D using the lower plates that overlap horizontally.

The result is as shown in FIG.

At this time, it is also possible to provide a packing f between the filter cloth and the lower plate.

After setting the filter cloth, close the door 〇 and seal it.

The door C is a lid for an opening provided on the wall of the filtration tank A through which a filter cloth is taken in and taken out, and has a flange shape and is attached with bolts or the like to seal the opening.

The technology selected is a conventional one.

(2) Formation of a filter layer (FIG. 5) Next, a solution such as diatomaceous earth is injected from the water intake pipe G to form a filter layer E on the surface of the filter cloth C, as in the conventional case.

At this time, keep the air supply valve closed.

■Filtration operation (Figure 6) After the filter layer is formed, raw water for filtration is injected from the water intake pipe G, and after the filth is captured by the filter layer E that was previously formed, it reaches the water collection chamber B, where it is filtered. Only the treated water is discharged from drain pipe H.

At this time, the filtered raw water and the filtered water follow a path like arrow C.

■Discharge of internal water (Figure 7) Close the water intake valve F, connect a compressed air pump, etc. to the air supply pipe d, open the air supply valve f, and gradually feed compressed air into the tank A.

The compressed air fills the tank A and pushes down the water in the tank A, and the water inside the tank A follows the path shown by arrow J and is discharged from the tank A.

■Cleaning work (Figures 3 and 7) After draining the water in tank A to a level below the plate, close air supply valve I and then remove filter cloth a.

At this time, since the water in tank A has already been drained, filter cloth a
can be taken out at the same time as the near-dry filter layer.

Then, the removed filter cloth a and filter NIE can be easily and safely washed by knocking them outside, etc., without generating sewage or the like.

<Effects of the present invention> Since the filtration device of the present invention is as described above, the following effects can be expected.

■Since the filter cloth and filter layer are installed horizontally on a low plate,
Even if the filter yz1i is stopped during operation, the filter layer does not fall off, and a stable filtration effect can be easily obtained.

Therefore, compared to conventional filtration devices, it is easier to operate, and improvements in work efficiency and human cost can be expected.

■The filter cloth can be easily removed from the filter, and no special skills are required for maintenance.

Therefore, the efficiency of one work is improved.

■The structure allows the filters to be stacked as needed, saving space and allowing additional filtration equipment to be added in a short time and at low cost after the filters are installed. .

■When cleaning the filter cloth, first drain the water in the tank with compressed air, and then take out the filter cloth along with the dry filter layer through the filter cloth loading/unloading door i provided on the filter. conduct.

As a result, it is possible to eliminate the highly concentrated polluted wastewater that was conventionally unavoidable when cleaning the filter layer, and also eliminate the occurrence of secondary contamination due to cleaning the filter cloth.

We can strive to protect the natural environment.

■The filtration device of the present invention drains the water in the tank using compressed air, and the filter cloth can be taken out along with the dry filter layer from the filter cloth loading/unloading door provided in the filter. Condition filter cloth and! The layer is beaten externally, etc.
It is easy to clean, and the running costs conventionally spent on secondary treatment of cleaning wastewater can be significantly reduced.

[Brief explanation of drawings]

Figure 1 = Explanatory diagram of conventional technology Figure 2: Explanatory diagram of the bending point in the conventional technology Figure 3: Detailed explanation of the invention Figure 4 = Partial explanatory diagram of the structure of the invention Figure 5: Explanatory diagram showing filtration work Figure 6 = Explanatory diagram of filtration operation Figure 7: Illustration of cleaning operation

Claims (1)

[Claims] A filter cloth is installed inside the filtration device body, a dissolved solution such as diatomaceous earth is injected into the device, and diatomaceous earth is attached to the filter cloth to form a filter layer, and this filter layer captures filtered waste from the filtered raw water. In a precoat type filtration device, a plate-shaped filter cloth is installed so that it can be pulled out in a direction transverse to the movement of the raw water to be filtered, and the filter cloth after the waste water has passed is pressurized with compressed air, dehydrated, and then filtered. A filtration device that features the ability to pull out cloth.