JPH0621704U - Backwashable filtration device - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it possible to efficiently backwash the filter medium in the housing with low pressure and a small amount of washing water. [Structure] A housing 1 containing a filter medium 5 and a stock solution flow path (1) through which the stock solution flows from a stock solution inlet / wash water outlet 2 above it toward a filtrate exit / wash water inlet 3 below
5, 14, 16, 11, 1, 12, 19) and the reverse washing flow passages (17, 12, 1,
11 and 18) and a pipe 20 for taking in air from the lower side of the housing 1 during backwashing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a backwashable filtration device for removing various contaminants such as fiber debris contained in processing water such as cloth washing liquid and dyeing liquid.

[0002]

[Prior art]

 In addition to the undiluted solution flow path for filtering the undiluted solution through the inside of the filtration device, a backwash flow channel for flowing the washing water in the opposite direction is provided. Prior to the filing of this application, a backwashable filtration device in which foreign substances such as fiber dust trapped on the granular filtration material are discharged out of the filtration device together with washing water has been already known (Japanese Patent Laid-Open No. Hei 10 (1999) -135242). No. 4-145907).

[0003]

[Problems to be solved by the device]

 The above-mentioned backwashable filtration device causes washing water to flow through the backwash flow passage to stir and wash the granular filtration material in the filtration device, so that fiber debris, etc. captured in the surface layer or deep layer of the filtration material. The filter residue is separated from each granular filter material and is discharged together with the washing water to the outside of the filtration device. To increase its effectiveness, the granular filter material should be shaken and agitated sufficiently in the washing water and the fiber debris should be removed. Sufficient buoyancy must be applied to the filter cake, etc., and it must be reliably discharged to the outside of the filtration device. For that purpose, a large amount of wash water with high water pressure is required.

An object of the present invention is to provide a filtration device that can be backwashed efficiently with low pressure and a small amount of washing water.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a backwashable filtration device of the present invention comprises a housing for housing a filter medium, and a raw liquid solution inlet / washing water outlet above the housing to a filtrate / washing water inlet below. It consists of an undiluted solution flow path through which the undiluted solution flows, a backwash flow path through which washing water flows through the housing in the opposite direction, and a pipe that takes in air from below the housing during backwash.

[0006]

[Work]

 In the backwashable filtration device configured as described above, during normal filtration of the undiluted solution, the undiluted solution flows in through the undiluted solution introduction port above the housing, passes through the granular filter material, and is discharged to the outside of the housing. . At that time, the solid matter contained in the undiluted solution is captured and deposited on the granular filter material, and the solution passing therethrough becomes a clear solution.

Further, at the time of backwashing, washing water enters inside through the washing water inlet below the housing, passes through the granular filter material, and is discharged outside the housing through the washing water outlet above. At that time, air flows into the housing from below, mixes with the cleaning water and moves upward, and then bubbles up into small and large air bubbles from the holes of the backup plate and evenly blows out upward. At that time, the buoyancy and the backwash water flow, together with vigorous agitation of the granular filter medium, violently blows it toward the wash water outlet while pushing the gap open. By this operation, the filter residue such as fiber scraps is separated from the filter material and is carried on the backwash water flow and discharged from the wash water discharge outlet.

[0008]

【Example】

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

This backwashable filtration device has a stock solution inlet / washing water outlet 2 on the upper side, a filtrate outlet / washing water inlet 3 on the lower side, and contains a granular filter medium 5. From the housing 1, the stock solution inlet / wash water outlet 2 to the filtrate exit / wash water inlet 3, the stock solution flow path for allowing the stock solution to flow through the housing 1, and the filtrate exit / wash water inlet 3 to the stock solution inlet It is composed of a backwash flow passage for passing wash water into the housing 1 to the combined wash water outlet 2, and an air intake pipe 20 for allowing air to flow into the interior from the lower side of the housing 1 during backwash.

As shown in FIG. 1, the housing 1 includes an upper housing, an intermediate housing, a lower housing, and a backup plate 6 sandwiched between the intermediate housing and the lower housing. Then, a granular filter material 5 is placed on the backup plate 6. The back-up plate 6 is made of gold steel or a punched plate having an opening size slightly smaller than the particle size of the filter medium 5, and plays a role of uniformly dispersing back-wash water and air bubbles on the entire filtration surface during back-washing. There is.

An air intake port 4 is provided below the filtrate / cleaning water intake port 3, and an air intake pipe 20 is connected to the air intake port 4 via an automatic two-way valve 13. ing. In order to uniformly disperse the backwash water and air bubbles over the entire filtration surface, the length of the straight pipe portion of the filtered liquid outlet / washing water inlet 3 must be at least 5 times the diameter of the air intake 4. Is desirable.

The material of the filter medium 5 is metal, stone, or the like, and if possible, it has a specific gravity of 7 to 9 that can easily rise up on the backwash water flow and is not discharged from the wash water discharge port. However, the size, shape, thickness of the filtration layer and the like differ depending on the size, shape and properties of the solid material to be removed. Further, it is important to select a material capable of forming a surface layer by capturing solid matter on the upper surface of the five layers of the filter medium. The reason for this is that during backwashing, the layered solid matter can be efficiently discharged to the outside of the housing 1 in a short time, and even in the post-treatment of the cleaning liquid containing the solid matter, the solid matter is very solid as a solid. This is because it can be taken out easily. Especially when the solid matter is fiber waste, the trapped solid matter can be collected in a felt-like form.

The stock solution flow path is composed of a stock solution suction pipe 15, a pump 14, a stock solution inlet pipe 16, an automatic three-way valve 11, a housing 1, an automatic three-way valve 12, a filtrate outlet pipe 19, and the like. The cleaning water inlet pipe 17, the automatic three-way valve 12, the housing 1, the cleaning water discharge pipe 18, and the like.

The automatic three-way valves 11 and 12 operate so that the stock solution flows in from the stock solution inlet 2 and is discharged from the wash water inlet 3 during the normal filtration operation, and the wash water is stock solution during the backwash. It switches to flow in the opposite direction to the flow of.

Further, the automatic two-way valve 13 opens at the same time when the automatic three-way valves 11 and 12 are switched during backwashing.

When performing a filtration operation in the backwashable filtration device having such a configuration, the undiluted solution suction pipe 15, the undiluted solution inlet pipe 16, and the automatic three-way valve 11 are supplied from the unillustrated undiluted solution pit by the pump 14. As described above, the stock solution is supplied from the stock solution inlet 2 of the housing 1. The undiluted solution introduced into the housing 1 passes through the layer of the filter medium 5, and the solid matter contained in the undiluted solution is trapped therein and gradually forms the surface layer of the solid matter. On the other hand, the clarified liquid passing therethrough is discharged from the filtrate outlet 3 through the automatic three-way valve 12 and into the filtrate outlet pipe 19.

When backwashing is performed, washing water is supplied from the washing water inlet 3 of the housing 1 through the washing water inlet pipe 17 and the automatic three-way valve 12. At this time, the automatic two-way valve 13 is opened at the same time when the automatic three-way valves 11 and 12 are switched, and air flows into the housing 1 through the air intake port 4. This air mixes with the washing water and moves upward, and then it becomes large and small bubbles from the holes of the backup plate 6 and evenly blows upward, and the buoyancy of itself and the backwash water flow combine to form the granular filter medium 5. While vigorously shaking and stirring, the gap between the granular filter media is pushed open, and blown up violently toward the upper wash water outlet 2. By this operation, the filter residue such as fiber scraps is separated from the filter material 5 and is carried on the backwash water flow and discharged from the wash water discharge port 2.

The cleaning time is controlled by a timer, and when the set cleaning time elapses, the automatic three-way valves 11 and 12 are switched, the automatic two-way valve 13 is closed, and the stock solution filtration operation is restarted.

[0019] By now the conventional apparatus, the supply water pressure and 0.5 kg / cm ^2, the results of the wash water was backwashed send about 20 seconds at a feed rate of filtration area 1c m ² per 14 cc / sec, devised this by the filtering device, the supply water pressure and 0.1 kg / cm ^2, the washing water feeding for about 15 seconds at a feed rate of filtration area 1c m ² per 6 cc / sec, and the air pressure and 1k g / cm ² at the same time, filtration area Comparing with the result of backwashing by sending air at a supply rate of 10 Ncc / sec per 1 cm ^2, the backwashing by the filtering device of the present invention has the same or more backwashing effect as the backwashing by the conventional device. I was able to. That is, the amount of water is about one-third and the supply water pressure is one-fifth.

[0020]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

That is, even if the backwashing time, the amount of wash water used for backwashing, and the supply water pressure are set to three-fourths, about one-third, and one-fifth of those of the conventional apparatus, respectively, they are equal to or more than those of the conventional apparatus. A backwash effect can be obtained. Therefore, it can greatly contribute to energy saving and resource saving.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a housing according to an embodiment of the present invention.

FIG. 2 is a piping system diagram according to an embodiment of the present invention.

[Explanation of symbols]

 1 Housing 2 Undiluted solution inlet / wash water outlet 3 Filtrate outlet / wash water inlet 4 Air intake 5 Filter media 6 Backup plate 20 Air intake pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location D06B 23/20 // D06F 39/10 Z 6704-3B

Claims (1)

[Scope of utility model registration request] 1. A housing for accommodating a filter medium, a stock solution flow passage through which the stock solution flows from an upper part of the stock solution inlet / washing water outlet to a lower part of the filter solution outlet / washing water inlet, and a reverse direction thereof. A backwashable filtration device comprising a backwash flow passage for allowing wash water to flow through the housing, and a pipe for taking in air from below the housing during backwash.