JPS61238314A - Method for forming filter material bed in filter machine - Google Patents

Abstract

PURPOSE:To obtain a filter capable of fine dust from the beginning, by allowing a liquid in which a fibrous material such as paper was dispersed and a liquid having a powdery material dispersed therein to successively transmit through a filter. CONSTITUTION:Paper is supplied to a supply cylinder 26, into which a liquid was preliminarily supplied, to be dispersed in said liquid. The resulting dispersion is flowed out from a supply port 19 to the peripheral direction and flowed into a main tank chamber 12 as a vortex stream from the opening provided to the lower end of a partition wall 9. A considerable amount of a fiber is adhered to the outer peripheral surface of a filter 11 and the dispersion is discharged from an outflow port 16 to be recirculated. The formed fiber bed reaches a thickness of about 10mm. Next, a powdery material is supplied to the supply cylinder 26 from the opening thereof to be dispersed in the liquid and the resulting dispersion is transmitted through the filter 11 to be recirculated. By this method, the powdery bed is adhered to the peripheral surface of the aforementioned fiber bed and the filter bed is compressed by the sucking action in the filter by a pump 22. The thickness of the filter material bed is about 3mm.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention provides a filter in which a filter material layer is formed on a filter, and then a liquid to be treated is passed through the filter to perform filtration treatment. The present invention relates to a method for forming a material layer.

<Prior Art> A filtration machine in which a fiber layer of paper or the like is formed on a filter, this is used as a filtration material layer, and a liquid to be treated that has passed through the filter is filtered is disclosed in, for example, Japanese Patent Laid-Open No. 55-59818. It is known that such a filter has good filtration performance and other effects.

In this filter, the filter material layer is formed by passing a liquid in which a fiber material or a mixture thereof is dispersed through the filter, and adhering the fiber material to the peripheral surface of the filter.

<Problems to be Solved by the Invention> By the way, the filter material layer at the time of its formation is cotton-like and thick, and the outermost fibers are floating and not dense. For this reason, when the liquid to be treated was passed through, it was not possible to remove fine dust at the beginning. The filtration material layer develops a predetermined filtration capacity only after dust adheres to the filtration material layer and the adhesion pressure compresses the filtration material tank and makes the microscopic voids in the filtration material dense. be.

For this reason, when the above-mentioned filter medium was initially formed, it had drawbacks such as not being able to carry out the prescribed filtration treatment and requiring a relatively long time to achieve the required filtration capacity. Furthermore, since the filtration ability becomes good after dust is attached, the fine pores of the filter medium are connected by the dust, which causes an increase in the liquid supply pressure. For this reason, there was a drawback that the time required for a well-balanced treatment with good filtration ability and low pressure loss was short.

The present invention aims to eliminate the drawbacks of the conventional methods.

Means for Solving the Problems> The present invention is a filtration device in which a filter is provided in a liquid tank, characterized in that a filtration material layer is formed on the peripheral surface of the filter by the following step. be.

First step: A liquid in which miscellaneous materials such as paper are dispersed is passed through the filter to form a fibrous layer on the peripheral surface of the filter.

Second stage The liquid in which the powder is dispersed is passed through the filter.

Here, the powder includes activated carbon and silicon earth.

Any material can be selected from a wide variety of materials such as coal and metal powder.

The fibrous layer formed in the first step is thick, cotton-like, and the fibers on the outermost periphery are floating and are not dense. When the powder layer is attached to the outer circumferential surface of the filter, the powder layer is attracted to the inside of the filter and presses against the fiber layer, and the fiber #I layer is compressed and its thickness becomes less than half and tightened. The state will be as follows. For this reason, the fiber layer becomes tight, and a filter material layer with a predetermined porosity is formed.

<Example> An embodiment of the invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a liquid tank, and a lower cylindrical body 2 having a conical lower end and a drain port 3 at its lowermost end is disposed at the bottom of the liquid tank. The drain port 3 is provided with an on-off valve 3a, which is closed except during cleaning. Moreover, an upper cylinder 5 having a smaller diameter than the lower cylinder 2 is mounted on the upper surface plate 4 of the lower cylinder 2, and there is a gap between the periphery of the upper cover plate 6 and the upper surface plate 4. The connecting rod 7 connects the lower cylindrical body 2.
and the upper cylinder 5 are connected and fixed. The upper surface Mi4
A fitting hole 8 having a diameter slightly smaller than the inner diameter of the upper cylinder 5 is formed in the upper cylinder 5. It is inserted into the lower cylindrical body 2 through the hole 8.

Further, a communication port 10 is bored in the cover plate 6, and the communication port 1
A cylindrical filter 11 is vertically installed at 0. The filter 11 is formed by covering a cylindrical frame with a mesh, and its lower end is positioned slightly above the lower end of the compartment wall 9.

The interior of the partition wall 9 is a main tank chamber 12 in which a filter 11 is housed. The outer diameter of the partition wall 9 is smaller than that of the fitting hole 8 to form a communication hole 14 therebetween, and the outer periphery of the partition wall 9 forms an annular sub-tank chamber 13.

Further, a cup-shaped liquid reservoir 15 is fixed on the lid plate 6, and an outlet 16 is formed in the wall surface of the reservoir 15. Further, the liquid reservoir 15 is controlled to communicate with the atmosphere via an air vent valve 17.

Furthermore, a supply pipe 18 passes through the lower cylinder 2, and its tip is positioned directly below the upper surface plate 4 of the outer periphery of the compartment wall 9, with its mouth end directed in the circumferential direction. Connect this to supply port 19
It is said that

The pipe connection between the outlet 16 and the supply port 19 will be explained.

The outflow port 16 is connected to a processing liquid tank and a pipe line 2 for recovering the processing liquid.
Connected by 0. In addition, the supply pipe 1 of the supply port 19
8 communicates with a dirty liquid tank such as a plating liquid tank through a conduit 21. A pump 22 is interposed in the pipe line 21, and an auxiliary agent tank 25 is connected at a rear position of the pump 22 via a switching valve 23.
is connected.

The auxiliary agent tank 25 has a supply cylinder 26 erected thereon, and communicates with the inside of the auxiliary agent tank 25 via an on-off valve 27 . The supply tube 26 has a stirring blade 28 installed therein. Further, the supply port of the supply cylinder 26 is connected to the pipe line 20 via a three-way switching valve 29.

In the above configuration, a method for forming the filter material layer 2 on the filter ll will be explained.

First, paper is supplied into the supply cylinder 26 which has been previously supplied with liquid, and the stirring blade 28 is rotated to cut the paper into fibers and disperse it within the supply cylinder 26. Such a dispersion, IIJ]
The closing valve 27 is opened and the auxiliary agent is transferred to the main body of the tank 25. Next, the switching valve 29 of the pipe line 20 is switched to connect the outlet 16 to the supply cylinder 26 side, and then the on-off valve 23 is opened and the pump 22 is driven to supply the dispersion liquid. The dispersion liquid flowing in the circumferential direction from the supply port 19 to the lower circumference of the compartment wall 9 swirls around the compartment wall 9 and descends, forming a vortex from the lower end opening of the compartment wall 9. , main tank chamber 12
flow inside. The purpose of generating such a vortex flow is to uniformly adhere m delamination to the outer circumferential surface of the filter 11. The dispersion liquid adheres a considerable amount of fibers to the filter 11, is collected from the outlet 16 through the pipe line 20, into the auxiliary agent tank 25, and further passes through the circulation path flowing out from the supply port 19, and then returns to the filter 11. Transparent. Due to this circulation, the fibers of the dispersion liquid are collected around the filter 11, and the liquid in the auxiliary agent tank 25 becomes clean. When attached to the filter 11, as shown in FIG. 3, the fiber layer X is a cotton-like coarse material with a thickness of about 1θ layer.

Next, the powder is supplied from the opening of the supply cylinder 26, dispersed in the liquid, and circulated through the filter 11 as described above. As a result, the powder layer y adheres to the peripheral surface of the fiber layer X, and each particle presses the fibers of the ttvta layer X due to the suction action into the filter 11 by the pump 22 described above. Therefore, the fiber layer X is compressed from its periphery.

When most of the powder dispersed in the liquid adheres, the fiber layer X becomes dense, as shown in FIG. arise.

After forming the filter material layer Z, switch the switching valve 29 to the original position to communicate the outlet 16 to the processing tank, further switch the on-off valve 23 to communicate the supply port 19 to the polluted liquid tank,
It passes through the filter material layer 2 and undergoes a filtration process.

If the filtration process continues for a long time, dust will accumulate in the filter medium layer Z, its processing capacity will decrease, and the internal pressure of the liquid tank I will increase. In such a case, the filtering material layer 2 is removed and recovered in the first step.

First, the switching valve 29 is switched to block the outflow port 16, and the air vent valve 17. Open the on-off valve 3a and open the drain port 3. As a result, the purified liquid in the liquid reservoir 15 rapidly flows down from the filter 11 into the main tank chamber 12 due to the action of atmospheric pressure on the liquid surface, and with this force, as shown in FIG. The filter material layer 2 is separated from the outer periphery of the filter 11. The liquid in the main tank chamber 12 descends as the liquid flows out from the drain port 3, and when the liquid falls below the lower end of the partition wall 9, the liquid in the sub-tank chamber 13 flows downward through the communication hole 14. Cylindrical body 2
Flow inwards. By the way, since the liquid level in the sub-tank chamber 13 is not in communication with the atmosphere, the manner in which the liquid level falls is that air bubbles from the lower end of the partition wall 9 rise into the sub-tank chamber 13 and rise above the liquid level. This is carried out every time the pressure of
The flow of bubbles creates a disturbed state. This effect causes turbulence in the liquid within the lower cylinder 2.

Due to this turbulent flow, the filter material separated from the filter 11 is prevented from settling at the inlet of the drain port 3 and blocking the drain port, and smooth liquid outflow is enabled.
The filter media is collected.

After this, the circumferential surface of the filter 11 is again □ by the above-described procedure.
A filter material layer Z is formed on.

The above-described stirring action due to bubbling in the sub-tank chamber 13 can also be produced in order to clean the wall surface of the sub-tank chamber 13.

Note that although the liquid in the liquid reservoir 15 was pressurized at atmospheric pressure, the liquid in the liquid reservoir 1
5 may be pressurized by a pump.

<Effects of the Invention> As described above, the present invention first forms a fibrous layer X on the outer periphery of the filter 11, and further forms a powdery layer y on the fibrous layer Since the dense filter material layer 2 is formed around the filter 11 by compressing X, there are excellent effects such as good filtration effect from the beginning.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal side view, FIG. 2 is a longitudinal side view showing the position of liquid level drop in the sub-tank chamber 13, and FIG. 3 is a view showing the formation of the fiber layer X. FIG. 4 is a partially enlarged vertical side view of the filter 11 shown in FIG. 4, showing the formation of the filter material layer 2. ]; Liquid tank 2: Lower cylinder 3; Drain port 5: Upper cylinder 9; Partition wall 11; Filter 12; Main tank chamber 13
;Sub tank chamber 14;Communication hole 15;Liquid reservoir 16;Outlet 1
8; Supply pipe 19; Supply port 22; Pump 25; Auxiliary agent tank

Claims (1)

[Scope of Claims] A first method for forming a filtering material layer in a filtering device, wherein a filtering material layer is formed on the peripheral surface of the filter by the following step in a filtration device having a filter provided in a liquid tank. A liquid in which a fibrous material such as process paper is dispersed is passed through the filter to form a fibrous layer on the peripheral surface of the filter. Second step: The liquid in which the powder is dispersed is passed through the filter.