JPH04145907A - Backwashable filter - Google Patents

Abstract

PURPOSE:To effectively renew a filter medium by discharging the solid collected on the granular filter medium packed in the filter in layers outside the filter along with cleaning water when the cleaning water is passed through a backwashing passage. CONSTITUTION:The backwashing passage for passing cleaning water through a filter 1 in the opposite direction to the flow of the raw liq. consisting of a cleaning water inlet pipe 13, valve 10, filter 1, automatic two-way valve 15, cleaning water outlet pipe 14, etc., is provided in addition to a raw liq. passage consisting of the raw liq. pit 6, pump 7, automatic three-way valve 8, filter 1, automatic three-way valve 10, clarified liq. outlet pipe 11, etc. The cleaning water is passed through the backwashing passage, and the solid collected on the granular filter medium 5 packed in the filter 1 in layers is discharged outside the filter 1 along with the cleaning water. As a result, a liq. contg. the solid such as fiber flocks causing clogging and difficult to remove from a filter body is efficiently filtered, the filtered material is efficiently recovered, and the filter medium is effectively reverved.

Description

[Detailed Description of the Invention] A. Purpose of the Invention [Field of Industrial Application] The present invention provides a granular filter material for removing various solid substances such as fibers contained in liquids such as fabric washing liquids and dyeing liquids. The present invention relates to a filtration device having the following features.

[Conventional technology]

In general, to remove solids from a liquid, in addition to surface filtration using a wire mesh, punched plate, etc., internal filtration methods such as filter cloth are used.

[Invention or problem to be solved]

In the case of surface filtration, even if the filter vortex becomes clogged, it can be cleaned relatively easily by backwashing, etc., but in the case of internal filtration, cleaning by backwashing etc. is difficult.

In particular, if the solids contained in the liquid are fiber debris, even if surface filtration is performed, the fiber debris will become entangled with the mesh portion, making backwashing ineffective. For this reason, for fiber waste etc.
A sea urchin type filter is often used.

However, the Weno type filter has a slit shape to prevent fiber waste from getting entangled, and although it is less prone to clogging, it allows a considerable amount of thread waste to pass through, reducing the filtration effect.

This invention is easy to cause clogging like fiber waste,
In addition, even liquids containing solids that are difficult to remove can be efficiently filtered, and even in the event of clogging, the filtration section can be easily and efficiently recovered by backwashing, and the filter media can be effectively removed. The purpose is to provide a filtration device that can be cleaned and regenerated.

Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, in the backwashable filtration device of the present invention, in addition to the flow path for the undiluted solution, there is a channel in the filtration device opposite to the flow of the undiluted solution. A backwash channel is provided to flow wash water in the same direction, and when the wash water flows through the backwash channel, the solids trapped on the granular filter material packed in layers in the filtration device are removed together with the wash water. It is something that is discharged outside.

[For production]

In the washable filtration device configured as described above, when it is appropriate to normally filter the undiluted solution, the undiluted solution enters from the inlet of the filtration device, passes through the granular filter material, and is discharged to the outside of the filtration device. At this time, the solids contained in the stock solution are captured and deposited on the granular filter medium, and the liquid passing therethrough becomes a clear liquid.

When flushing water flows through the backwash channel, the cleaning water enters the filtration device from the clarified liquid outlet, passes through the granular filter material, and is discharged from the filtration device from the raw liquid inlet.

At this time, the solid matter layer captured and formed on the granular filter medium is carried by the flow of the wash water and discharged out of the filtration device along with the wash water. At the same time, the granular filter material is also agitated and washed by the jet of washing water, and the solid matter that has accumulated inside flows out and is discharged outside the filtration device.

〔Example〕

An embodiment of the backwashable filtration device of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, a passing device 1 forming the main body of this device is composed of an upper housing 2, a lower housing 3, and a back-up plate 4 held between them.

A granular filter material 5 is placed on the back-up plate 4. The back-up plate 3 is made of gilt copper or a punched plate with an opening size slightly smaller than the particle size of the filter medium 5.

The filter material 5 may be made of any material such as metal, resin, stone, etc., as long as it is larger than the liquid type, but its size, shape, thickness of the filtration part, etc. will depend on the size of the solids to be removed, Varies depending on shape and properties. That is, the filter vortex part 9 in which the filter media 5 are laminated
A type that captures solids as much as possible on the upper surface of the filter and forms a surface layer with the solids, a type that reduces pressure loss as much as possible in the filtration vortex section with laminated filter media, and a type that can trap solids as much as possible on the upper surface of the filter. It is important to select one that is sufficiently agitated by the jet of washing water.

The stock solution is supplied from the stock solution pit 6, through the pump 7, through the automatic three-way valve 8, and from the upper stock solution inlet 2a of the filtration device 1, as in the conventional device. The stock solution introduced into the filtration device 1 passes through the filtration vortex section 9 in which filter media 5 are laminated, and the solids contained in the stock solution are captured by the filtration vortex section 9, and the solids are gradually transferred to the filtration vortex section 9. Forms the surface layer of objects. The clarified liquid that has passed through the filtration vortex section 9 passes through the automatic three-way valve 10 from the clarified liquid outlet 3a, and is discharged into the clarified liquid outlet pipe 11. That is, the flow of liquid during steady state follows the path shown by the solid line arrow in FIG.

In the filtration device of the present invention, the configuration described below is further added to enable backwashing.

First, pressure gauges P1 and P2 are installed to measure the pressure of the raw liquid population 2a and the pressure of the clarified liquid outlet 3a of the filtration device 1, respectively, and the measured pressure difference between them is constantly observed, and the signal value exceeds a certain set value. Backwashing should be started when this happens. As a simple method, it is possible to simply detect the increase in inlet pressure using the pressure gauge P1.

In addition, a pump circulation pipe 12 is installed between the stock solution pit 6 and the automatic three-way valve 8, a washing water inlet pipe 13 is connected to the automatic three-way valve 10, and a washing water outlet pipe 14 is connected to the stock solution port 2a. An automatic two-way valve 15 is attached to the.

Then, when the automatic three-way valve IO is switched to the pump circulation pipe 12 side, the automatic three-way valve 10 is switched to the wash water inlet pipe 13 side, and the automatic one-way valve 15 is opened, the wash water is released as indicated by the dotted line arrow in FIG. It flows through the channel and is backwashed. That is, the washing water is
It passes through an automatic three-way valve 10 and is supplied to the filtration device 1 from a clear liquid outlet/wash water inlet 3a at the bottom of the filtration device. The washing water supplied from the lower part of the filtration device flows in reverse to the filtration vortex section 9, and the solid layer that has been captured and formed on the upper surface of the filtration section is carried on the upward flow of washing water, and the solid material layer is transferred to the raw solution inlet together with the washing water. The cleaning liquid is discharged from the cleaning liquid outlet 2a through the automatic three-way valve 15 and into the cleaning liquid outlet pipe 14. At the same time, in the filtration vortex section 9, the filter medium 5 is agitated and washed by a jet of washing water from below, and the solids that have accumulated inside the filtration section are flowed out and discharged together with the washing water into the washing liquid outlet pipe 14. Ru. In this way, the filter medium 5 is also cleaned. The cleaning time is controlled by a timer, and as the set cleaning time elapses, the automatic three-way valve 8 is switched to the undiluted solution 2a side, the automatic three-way valve 10 is switched to the clear liquid outlet pipe Il side, and the automatic three-way valve 15 of the clean liquid outlet pipe 14 is switched to the clear liquid outlet pipe Il side. Close, respectively, and start the stock solution filtration process again.

Note that it is desirable that the captured solids form a layer in the filtration vortex section 9. With Nasase, it is possible to efficiently discharge the accumulated solids outside the machine during backwashing in a short time, and even in the post-processing of the cleaning solution containing the solids discharged outside the machine, the solids can be removed as lumps. This is because the processing can be performed very easily.

Particularly when the solids are fibrous waste, it is possible to collect the trapped solids in a felt-like form. Furthermore, in order to quickly guide the solid matter layer out of the machine during backwashing, it is preferable that the part from the second part of the filtration vortex part 9 to the cleaning liquid outlet 2a be tapered so that there is no step.

C8 Effects of the invention Since this invention is configured as explained above,
This produces the effects described below.

In other words, the solid layer that has been trapped and formed on the granular filter media can be removed efficiently and easily in a short time by using a jet of backwash water, and the filter media can be agitated and washed. can now be reliably cleaned and regenerated. Moreover, the device has an extremely simple structure.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a filtration device according to an embodiment of the present invention;
FIG. 2 is a system diagram according to an embodiment of the present invention. 1- Filtration device, 2a--Standard liquid inlet and cleaning liquid outlet, 3a
Clarifying liquid outlet and washing liquid inlet, 5 Particulate filter agent agent Yasushi Moto Fujii, patent attorney

Claims (1)

[Claims] 1. In addition to the flow path for the stock solution, a backwash flow path is provided in the filtration device that allows wash water to flow in the opposite direction to the flow of the stock solution, and when washing water flows through the backwash flow path, it is filled in a layered manner inside the filtration device. A backwashable filtration device that discharges the solids trapped on the granular filter media out of the filtration device along with the wash water.