JPS59166218A - Method and device for filtering and thickening - Google Patents

Abstract

PURPOSE:To enable an improvement in the density of filter media by the pressing force of floating bodies in the state of filtering raw water in upward countercurrent and to permit easy backwashing by suspending many flexible fibers supported at the top end over the entire surface and coupling the bottom ends thereof to the floating bodies. CONSTITUTION:Raw water is supplied through a raw water feed port 5 into a filter tank vessel 1. When said water is filtered in upward countercurrent, a filter bed 2 of flexible fiber bundles is pressed upward by spherical (lumped) floating bodies 3 having buoyancy to form the filter bed consisting of the dense fiber layer. Suspended matter is captured mainly by the bottom surface of said filter bed. A valve 6 is closed upon ending of the filter operation and when a valve 7 in a discharging port for thickened water is opened in the stage of starting backwashing and regenerating operations, a negative pressure is generated in the inside. The air flows directly into the chamber S2 under the filter bed by flowing through an air outlet and inlet 10 and an air introducing port 16 without passing the filter bed and lowers the water level in the lower chamber in the state of leaving the filter water in the upper chamber S1. The filter bed of the fiber bundles is then released and the washing by the downflow filter water from the upper chamber is made possible.

Description

Detailed Description of the Invention The present invention combines a liquid-permeable hearth made of a large number of flexible fibers suspended over the entire surface, and a buoyant ball (lump), cylindrical KAF shape, and grid-like object. A filtration device characterized by using a new hearth and having an air inlet to enhance the cleaning effect of the hearth, and using the same to filter and trap suspended matter in water and concentrate it. Regarding the method, the earlier application
This is an improvement of 9516.

A well-known type of filtering device that uses a flexible fiber hearth is a rotating body type in which a long-haired hearth cloth is stretched around the outer periphery of the drum. The force of the drum caused the hairs to flutter and stick together to form a hearth, and when water passed from the outside to the inside of the drum, a cake was formed on the surface layer.

This method has the advantage of being able to perform continuous filtration, but on the other hand, since it is a rotating chain, there are mechanically operating and sliding parts, which increases production and maintenance costs, and it is difficult to clean the furnace bristles. There are many disadvantages, such as being insufficient.

On the other hand, in this system, the floating body used in the upward flow is a floating sphere (clump), which itself serves as the hearth, so the hearth has coarse mesh and poor filtration accuracy. In order to improve the filtration accuracy, the diameter of the sphere (lump) body is reduced.7 The buoyancy is small, and the separation from the cake is poor, and together with the backwash water, this rod sphere (
There was a drawback that the lumps) leaked out.

For this purpose, zeolite is placed at the top of the floating sphere (clump) hearth.
Methods have been taken to supplement filtration accuracy by providing a fixed or fixed layer of diatomaceous earth or sand, or by providing an auxiliary hearth such as a mat-like fiber layer.

However, these auxiliary hearths have the disadvantage that when simply backwashing with a downward flow, the particles or fibers in the mat that make up the hearth are not spaced, and the hearth is not sufficiently washed and regenerated. there were. For this reason, the auxiliary hearth had to be taken out and washed with high-pressure water, which had serious drawbacks, and despite its many advantages, a floating furnace was used.'' - The countercurrent flow system is not used much today.

The filtration device according to the present invention partitions a filtration tank container into an upper chamber and a lower chamber with a liquid-permeable hearth formed by hanging a large number of flexible fibers over the entire surface, and in the lower chamber, the undiluted solution floats, It is equipped with a buoyant floating body capable of pushing up the flexible fiber bundle in a compact manner, and is also provided with a stock solution supply J430 and an air inlet/outlet.

A few lines further, in the filtration device that uses a combination furnace body of the flexible fiber bundle hearth 2 and the floating body 3 that presses the flexible fiber bundle hearth 2 from below by buoyancy force, the present application further uses the royal By adding a mechanism that directly introduces air, the consolidation (during filtration) of the fiber bundle hearth by the floating body and the unclamping and drooping (during backwashing) operations are made complete and reliable.
It has been possible to provide a filtration device with extremely few mechanically operating parts (c), which is therefore inexpensive, easy to maintain, and has good filtration accuracy.

This will be explained in more detail with reference to FIG.

When raw water is supplied into the filtration tank container 1 from the raw water supply port 5 and filtered in an upward flow, the flexible fiber bundle hearth 2 is moved upward by the buoyant ball (clump)-shaped floating body 3. It is crimped to form a tight fiber bed hearth, the lower surface of which primarily collects suspended matter.

However, when considering backwashing and regeneration of the hearth, if backwashing is performed by simply changing the flow direction to a downward flow in this state, a very powerful water flow will push down the floating objects or the lower chamber S
Unless a stirrer is provided in the hearth, the floating spheres (clumps) consolidate the bed, and the cleaning effect of the fibers forming the hearth is low. We discovered that this required a large amount of washing water, which diminished the concentration effect, and as a result of various attempts to improve this, we found that by providing the air inlet 16, it was possible to achieve a high washing effect with a minimum amount of water. It was a success.

That is, when the overflow operation is finished, the valve 6 is closed, and the knob 7 of the concentrated water outlet is opened when proceeding to the backwashing and regeneration operations, the internal pressure becomes negative, so that air can pass through the hearth. through the air inlet/outlet lO and the air inlet 16 to the lower hearth chamber S2.
will flow directly into.

Therefore, by lowering the water level in the royal chamber and lowering the position of the floating body while leaving the reactor water in room 11 s1,
The hearth cleaning effect is enhanced because the fiber bundle hearth is opened and allowed to hang in the air, and the fiber bundles remain in the L room S1 or are washed down on weekends.

The air inlet 6 may be of any route as long as it has a structure that allows air to be fed directly into the chamber below the hearth without passing through the hearth during backwashing, but for example, the structure 17 shown in FIG. An example is structure 21 shown in the figure.

What is shown in FIG. 2 is a back washing process, when valve 6 is closed and valve 7 is opened, negative pressure is created inside and from pipe 17,
In the case shown in FIG. 4, air flows directly into the lower chamber S2 from the pipes 21.

To explain in a related manner, as the fiber material forming the flexible fiber layer hearth, the flexible natural fiber ζ may be any synthetic fiber, and this fiber bundle is supported in parallel rods or in an annular shape. The inverted U-shaped 2 and ring-shaped 26 (Fig. 5) K are lined up on the entire surface of the metal fitting 18, and the upper end is fixed to the support metal fitting 18.

Also, a base fabric with so-called long hair, which is attached to a liquid-permeable support such as a wire mesh over the entire surface of the fabric, can also be used as having the same effect.

Next, an example of a floating object for crimping is a spherical or lumpy object with buoyancy, but in the case of the present invention, it is not expected to have a hearth effect of its own, so it is thicker than the conventional floating spherical hearth. With fine eyes, diameter 0.5~IOC! m, particularly preferably 2
A size of ~50m is suitable; if the buoyancy is too small, it will be discharged with the slurry during backwashing and there will be loss due to dissipation.On the other hand, if it is too large, unevenness will occur during consolidation of the fiber layer. . Materials such as hollow glass spheres and polymeric foam blocks are easily available on the market.

In addition, as another alternative to the floating body for crimping, a cylindrical empty shell body with both ends sealed can be cited as having the same effect. In this case, as shown in FIGS. 2 and 3, the upper end of the fiber bundle is glued or tied to the fiber bundle support fitting 18 fixed to the wall of the filtration tank, and the lower end to the end envelope-shaped hollow shell 19. There is also one that is in a hanging state.

Therefore, depending on whether the water level rises or falls, the floating body also rises or falls, and the fiber bundle can be consolidated or released/expanded between directly above the fixed fiber bundle support.

FIG. 4 and FIG. 5 are examples of a grid-like floating body 27. In some cases, a fiber bundle (2,
26), a wire mesh 29 may be applied to the entire surface in order to uniformly press the parts 26).

In the device of the present invention, the floating body is lowered by directly introducing air into the lower chamber, and cleaning and regeneration are carried out with the fiber bundle hearth fully expanded and expanded, so it is efficient with the small amount of reactor water remaining in the royal chamber. Although this can often be done, if cleaning with reactor water alone in the upper chamber is insufficient due to the nature of the suspended material, cleaning with reactor water may also be used in combination to make this more complete and reliable. can.

The materials, shapes, operations, and effects of the individual parts have already been described in the main text, but here I would like to describe the characteristics when the device according to the present invention is applied to a method for concentrating suspended matter.

The first advantage cited as a feature is that the apparatus H of the present invention does not have any mechanically moving parts such as rotating bodies, running of the furnace cloth, stirring, etc. This means that there are fewer failures, easier maintenance, fewer auxiliary machines such as vacuum pumps and high-pressure pumps, and less energy consumption.

The second advantage is that the filtration pressure can be achieved only by the naturally occurring head pressure difference (Hl-H2) between the raw water tank and the reactor water tank, and from this point of view as well, it is energy-saving.

The third advantage is that the effect of the consolidated fiber bundle hearth created by the floating body traps suspended matter not only in the surface layer but also in the depth and depth, so the trapping capacity is large despite the relatively high furnace speed. One example is that. Furthermore, since the regeneration and cleaning are performed with the fiber bundles spread out by lowering the float and upper body, the cleaning effect is great.

A fourth advantage is that by providing an air inlet in the lower chamber, the amount of washing water can be reduced and the washing effect can be further enhanced, which is a complete accomplishment of the present invention.

[Brief explanation of the drawing]

The figure schematically shows an embodiment of the present invention. Figure 1 is a side sectional view of a type of device (filtration process) using a spherical floating body for crimping, and Figure 2 is a tubular floating body for crimping. Figure 3 (A) is an enlarged view of the hearth and floating body parts in Figure 2, and Figure 3 (B) is A cross section taken along line M-N of A) is shown. FIG. 4 is a side cross-sectional view of a device that uses a wire mesh lattice-like floating body and also has a shower cleaning function. FIG. 5(A) is an enlarged view of the hearth and floating body portions in FIG. 4, and FIG. 5(B) shows a cross section taken along line EF in FIG. 5(A). FIG. 6 is a plan view of the wire mesh annular floating body. Description of symbols 1; Filtration tank container 2; Fiber bundle (inverted U-shape) 3; Spherical floating body 4; Perforated plate for preventing integral outflow of floats 5; Raw water supply port 6: Raw water supply valve 7; Concentrated water discharge valve 8; Concentrated water storage tank 9; Reactor water storage tank lo;
Air inlet/outlet storage tank 14; Raw water = 57m x'7, 15; Concentrated water outlet pipe 16i x'7. ; Air inlet 18
; Fiber bundle support fitting 19: End envelope-shaped floating body 2
0i Fiber bundle Kuku I) String 21; Air inlet 2
2; Float type check valve 23; Water supply bong for shower. 24; Lobe for suspending the floating body 25; Chain 26; Fiber bundle (ring-shaped) 27; Lattice-shaped floating body H
1; Raw water shellfish 1', l, H2 Kojimizu! I? f tatemeshi 8" 1shi figure 3

Claims (1)

[Scope of Claims] (1) A filtration tank is equipped with a buoyancy float that suspends a large number of flexible fibers over the entire surface and is floated by the raw solution to push up the flexible fiber bundles in a consolidated manner. A concentrating device according to claim (1). (3) A superconcentration device according to claim (1), wherein the two floats are constructed by arranging end envelope-like empty shells. (4) The filtration and concentration device according to claim (1), wherein the floating body is configured in a lattice shape, annular shape, or spiral shape. (5) The filtration/concentration device according to claim (1), wherein the floating L body is attached to the lower end of the flexible fiber bundle. (6) The floating body is attached to the lower end of the flexible fiber bundle. The superconcentration device according to claim (1) is a superconcentration device that incorporates special equipment suspended from a support fitting for a sex fiber bundle by a rope, chain, etc. The upper and lower chambers are partitioned by a liquid-permeable furnace material floor made of flexible fibers suspended over the entire surface, and the lower chamber has a floater that floats with the raw solution and pushes up the flexible fibers in a compacted manner. When carrying out this process, the undiluted solution to be filtered is introduced from the royal family, passed through the furnace material which has been consolidated to form a layer by the buoyancy of floating bodies loaded in the undiluted solution, filtered and collected suspended matter, and passed through the furnace material. Water is discharged from the upper chamber to the outside of the filtration tank, and when recycling the clogged door material,
The filtrate in the upper hearth chamber is drawn out while introducing air below the container, and the floating body is lowered to bring the hearth made of flexible fibers into a suspended state. A filtration/concentration method Q characterized in that the water is passed through, and then washed and regenerated. The filtration and concentration method according to claim (8), characterized in that water jetted from the filter is used in combination.