JPH04126702U - Filter layer cleaning device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a filter layer cleaning device in which horizontal rotary tubes on the surface of the filter layer and inside the filter layer are configured to be rotatable independently so that surface cleaning can be reliably performed prior to backwashing. do. [Structure] Horizontal rotating tubes 3 and 4 are installed in upper and lower stages on the surface of the filter layer and within the filter layer. Then, a rotary joint 9 is provided between the horizontal rotating pipe 3 on the surface of the filter layer and the fixed water supply pipe 8, and
A rotary joint 9 is also interposed between the horizontal rotary tube 3 on the surface of the filter layer and the horizontal rotary tube 4 in the filter layer, so that the upper and lower horizontal rotary tubes 3 and 4 can be rotated independently. do. When cleaning water is supplied from the fixed water supply pipe 8 to the horizontal rotating pipes 3 and 4 and is injected from the multiple injection nozzles 7 provided in the horizontal rotating pipes 3 and 4, the horizontal rotating pipes 3 and 4 are sprayed by the injection reaction force at that time. 4 rotate independently to ensure that the dirt-fixed layer on the surface of the filter layer is destroyed and peeled off from the filter medium, which is the original purpose of surface cleaning.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is a filter layer cleaning device for sand filtration equipment in water treatment plants, sewage treatment plants, etc. Regarding the improvement, in detail, cleaning of the surface part of the filter layer (surface cleaning) and cleaning of the inside of the filter layer. The horizontal rotary pipes installed for this purpose are configured to be able to rotate independently, and the This invention relates to a filter layer cleaning device capable of surface cleaning.

0002

[Conventional technology]

Traditionally, suspended solids trapped in the filter layer of filtration ponds at water treatment plants, etc. are separated from the filter media. In order to eliminate the disadvantages of backwashing only and to make backwashing more effective, a filter layer is added. Surface cleaning is performed by washing the surface layer from above with high-pressure water (for example, (See Publication No. 25455).

0003 The purpose of such surface cleaning is firstly to destroy the fixed surface contaminant layer and secondly to remove the contaminant. It's far away. The surface layer of the filter layer before cleaning, which traps contaminants and causes filtration blockage, becomes solidly turbid. Forms a fixed fixed layer. If this is not destroyed before backwashing, turbidity A ball-shaped lump (this is called a mud ball) is formed in which the toro wood is stuck. Matt Debords significantly reduce the filtration function, so we must prevent their occurrence as much as possible. It won't happen. The turbid layer, which has been finely broken up by the pressure water, is removed by continuous surface cleaning. (See the cleaning process diagram of the present invention in Figure 7(a)).

0004 By the way, in the case of the two-layer filtration basin shown in the right diagram of Figure 6, its pollution level is the same as the pollution distribution shown in the left diagram. As shown in the figure, the surface layer of the upper filter medium 1 is the largest, and it decreases rapidly as it goes downward. The degree of contamination increases again at the interface of the lower filter medium 2, and as it goes downwards, it increases again. Decrease sharply.

[0005] In the case of multilayer filtration, the suspended solids have entered the interior, so cleaning only the surface is necessary. However, there are some areas that cannot be cleaned completely, so it is necessary to clean not only the surface but also the inside of the filter layer. Ru. Further, backwashing alone is insufficient because suspended matter cannot be sufficiently removed from the filter medium.

[0006] Therefore, in order to increase the cleaning effect inside the black filter layer, two horizontal rotating tubes 3 and 4 were installed as shown in Figure 5. As a stage type, the first stage is on the filter layer surface (upper filter material) 1, and the second stage is on the filter media boundary inside the filter layer. It is installed on the surface (lower filter material) 2. In Figure 5, W is the water surface and 7 is horizontal rotation of the upper and lower stages. A large number of injection nozzles are arranged in a row with a constant injection direction on the pipes 3 and 4, and 8 is a horizontally rotating pipe 3. , 4 is a fixed water supply pipe for supplying cleaning water, and 9 is a rotating pipe provided on the fixed water supply pipe. The fitting is shown.

In this device, cleaning water of 2 to 4 kg/cm ² is supplied to the horizontal rotary tubes 3 and 4 through the fixed water supply pipe 8 and jetted from the fountain nozzle 7, and the jet reaction force at that time causes the rotary joint 9 to It is constructed so that the surface of the filter layer and the inside of the filter layer are simultaneously cleaned while rotating the horizontal rotary tubes 3 and 4 in two stages, upper and lower, as a center.

[0008]

[Problem that the idea aims to solve]

In the conventional device described above, the rotary joint 9 is fixedly connected to the first stage horizontal rotary pipe 3. It is installed only in one place on the water supply pipe 8, and the first and second stage horizontal rotating pipes 3 and 4 are integrated. Because it is configured to rotate in the Even if you try to rotate the filter by supplying it with It does not rotate due to the resistance of the material, and therefore the first horizontal rotating tube 3 on the surface of the filter layer also does not rotate. This will result in a situation where the problem occurs. In other words, with this conventional device, the backwashing performed after this Therefore, the vertical and horizontal rotating tubes 3, 4 will start rotating.

[0009] However, with this method, the turbidity fixed layer on the surface of the filter layer cannot be destroyed before backwashing. , which causes mud balls (Figure 7(a)(b) Comparison of this invention and conventional cleaning process diagrams) reference) . Moreover, considering the contamination distribution as shown in Figure 6, it is necessary to In both cases, it is necessary to rotate the horizontal rotary tube 3 in the first stage to perform surface cleaning. Ru.

0010 In addition, in the case of a type in which the upper and lower horizontal rotating tubes 3 and 4 rotate integrally as shown in Fig. 5, The flow of filter media increases due to the entrained water flow (rotating water flow accompanying the rotation of the upper and lower horizontal rotating tubes). There is a big risk of it coming out. In particular, coarse-grained, low-density filter media, such as aluminum In the case of multilayer filtration with a layer of anthracite (anthracite: specific gravity 1.4 to 1.6), the upper layer There are many leaks of anthracite, and a considerable number of cases have been reported in the past, making it a problem. Ru.

[0011] In this invention, horizontal rotating tubes on the surface of the filter layer and inside the filter layer are configured to be able to rotate independently. A cleaning device that enables cleaning of the surface layer of the filter layer (surface cleaning) prior to backwashing. The purpose is to provide

0012

[Means to solve the problem]

In order to achieve this purpose, the filter layer cleaning device according to the present invention supplies cleaning water from a fixed water supply pipe. The liquid is supplied to a horizontal rotating tube and injected from a number of injection nozzles provided on the horizontal rotating tube. In a cleaning device in which the horizontal rotating tube is rotated by the jet reaction force of A horizontal rotating tube is installed on the surface and within the filter layer, and the horizontal rotating tube on the surface of the filter layer and the fixed A rotary joint is provided between the water supply pipe and the horizontal rotary pipe on the surface of the filter layer and the filter layer. The feature is that a rotary joint is also interposed between the inner horizontal rotary tube.

[0013]

[Effect]

In the above configuration, when the cleaning water is supplied through the fixed water supply pipe, water on the surface of the filter layer The horizontal rotating tubes in the filter layer are configured to be able to rotate independently, so the horizontal rotation tubes in the filter layer Even when the rotating tube does not rotate due to the resistance of the filter media, at least the most heavily contaminated filter layer The horizontal rotating tube on the surface moves in a predetermined direction due to the reaction force of the jet of cleaning water from the fountain nozzle. Rotate to destroy the turbidity fixed layer on the surface of the filter layer before backwashing, and then filter it out. It performs its original surface cleaning action by removing it from the material. And usually this is followed by Enhances the effectiveness of backwashing performed during cleaning.

[0014] When backwashing starts and the inside of the filter bed becomes fluidized, the horizontal rotating tube inside the filter bed also rotates open. First, the inside of the filter layer is cleaned (in the case of two layers, the interface is cleaned). In this case, the filter layer Due to the resistance of the filter media in the horizontal rotating tube inside, the rotation operation usually does not start until the surface of the filter layer is reached. It lags behind the horizontal rotating tube above, and the rotational speed is also different, so the rotational phase difference between the two is arise. In this case, the entrained water flow will be smaller than when the vertical and horizontal rotating pipes rotate together. This reduces the risk of the filter media in the surface layer flowing out.

[0015]

【Example】

Embodiments of the present invention will be described below with reference to the drawings.

[0016] FIG. 1 is a front view of the device of the present invention with the right half omitted. Same as the conventional technology mentioned above Components are shown with the same reference numerals.

[0017] Figure 1 shows the case of a two-layer filter. Upper layer formed below the water surface W (upper filter medium) 1 has coarser particles and lower specific gravity than, for example, a sand layer, from the viewpoint of high efficiency and high-speed filtration. Anthracite (anthracite) is used, and the lower layer (lower filter medium) 2 is a sand layer.

[0018] On the surface of the upper filter medium (filter layer surface) 1 and the lower filter medium (filter layer boundary surface) 2, that is, the filter There are filters on the layer surface 1 and inside the filter layer for surface cleaning and interface cleaning, respectively. Horizontal rotating pipes 3 and 4 in two stages, parallel to the material surface, are connected via connecting pipes 5 and 6, respectively. It extends from left to right. Each of the horizontal rotating pipes 3 and 4 has a plurality of fountain nozzles 7. Many of them are arranged in rows with the firing direction pointing slightly downward. A fixed water supply is provided in the upper connecting pipe 5. A pipe 8 is connected via a rotary joint 9, and horizontal rotation is possible through this fixed water supply pipe 8. Cleaning water is supplied to the pipes 3 and 4. And the upper and lower horizontal rotating pipes A rotary joint 9 is also interposed at the connection between the upper and lower horizontal rotary pipes 3 and 4. 4 are configured to be able to rotate independently. That is, through the fixed water supply pipe 8 When cleaning water is supplied, the lower horizontal rotating tube 4 in the filter layer rotates due to the resistance of the filter media. Even when not being rotated, the upper horizontal rotary tube 3, which is on the most heavily contaminated filter layer surface 1, rotates in a predetermined direction due to the jet reaction force when cleaning water is jetted from the fountain nozzle 7. Cleaning of the filter layer surface 1, that is, surface cleaning is ensured. And then, This is usually followed by backwashing (passing water in the opposite direction to the filtration direction). When the inside of the filter layer becomes fluidized by washing), the horizontal rotating tube 4 inside the filter layer also starts rotating. In addition, cleaning of the boundary filtration layer (this is called interface cleaning) is also possible. It has become.

[0019] That is, as shown in the cleaning process diagram of the present invention device in Fig. 7(a), the first 1 to 3 The surface contamination layer that has solidified during the surface cleaning for several minutes is broken down into small pieces by the pressure water. This destroyed turbid layer continues to be washed for 1 to 5 minutes (at this point, the surface is washed in reverse). (Start rinsing) to separate it from the filter media, then continue washing for 3 to 10 minutes. Suspended matter is discharged by backwashing. In this way, the present invention uses backwashing. It destroys the surface contaminant layer that has adhered to the surface before cleaning, and then peels off the suspended solids from the filter media. The original purpose of surface cleaning is reliably achieved.

[0020] The above-mentioned rotary joint 9 may be of a conventionally known type; in particular, when rotation control is required, this The one described in Utility Model Publication No. 2-25455 proposed by the applicant may be used.

[0021] The fountain nozzle 7 provided on the horizontal rotating tube 3 on the filter layer surface 1 has a spray direction that is 3, diagonally to the filter layer surface, that is, about 15 to 30 degrees below the horizontal. It is set up so that This allows water to be sprayed onto the filter layer surface 1 and the filter layer can be agitated. turbidity exfoliation is promoted. The horizontal rotating tube 4 installed in the filter bed is equipped with a preferably at symmetrical positions where the injection direction is about 15 to 30 degrees above and below the horizontal line. fountain nozzles 7 are provided. Providing it diagonally upward in this way is simply a matter of providing it diagonally upward. You can clean a wider area by spraying it upward as well, rather than just cleaning the area. This is because the cleaning effect is effective on the entire filter layer.

[0022] In the embodiment shown in FIG. However, it may be installed on the opposite side so that the injection direction is completely reversed. . This is because the upper and lower horizontal rotary tubes 3 and 4 are configured to be able to rotate independently. In this case, the rotation of the upper and lower horizontal rotary tubes 3 and 4 is The directions are reversed, and the entrained water flows accompanying the rotation of horizontal rotating pipes 3 and 4 cancel each other out. Therefore, the effect of preventing the filter media from flowing out becomes remarkable. The specific gravity of anthracite on the surface of the filter layer is This is a great advantage because it is small and easily leaks out. Originally, as shown in Figure 1, the vertical and horizontal rotation Horizontal rotation in the filter layer can also be achieved by configuring the transfer tubes 3 and 4 to be able to rotate independently in the same direction. Since the transfer tube 4 receives resistance from the filter medium, there is a phase difference in the rotation of the upper and lower horizontal rotation tubes 3 and 4. This also suppresses the entrained water flow and prevents the filter media from flowing out. The risk decreases. In addition, in order to improve the cleaning effect, the fountain nozzle 7 can be rotated vertically and horizontally. It is also conceivable to arrange the pipes in a staggered manner between the transfer pipes 3 and 4.

[0023] The cleaning depth with a single-stage horizontal rotating tube is generally about 10 to 20 cm of the filter layer, and currently The thickness of the filter layer most commonly used in water treatment plants, etc. is 60 cm, so it is difficult for dirt to progress. Judging from the contamination distribution diagram in Figure 6, two stages of horizontal rotating tubes are sufficient. But below In the water treatment and sewage treatment fields, filter layers of 1 m or more are used, and granular activated filters are also used. In charcoal adsorption tanks, the layer thickness is 1.5 to 2 m. In this case, as shown in Figure 2, there are many Make it tiered so that the second and subsequent tiers rotate together. In other words, the horizontal rotation from the second stage onward There is no particular need to rotate the transfer tube 4 independently, and it is similar to the two-stage type shown in Figure 1. , the rotary joint 9 connects the fixed water supply pipe 8, the horizontal rotary pipe 3 on the surface of the filter layer, and the horizontal rotation inside the filter layer. It is sufficient to provide only two locations between the transfer tube 4 and the transfer pipe 4. The horizontal rotating tube 4 in the filter layer is configured in multiple stages. By doing so, even deep filtration ponds and adsorption ponds can be effectively cleaned.

[0024]

[Effect of the idea]

According to the present invention explained above, the horizontal rotating tube installed on the surface of the filter layer inside the filter layer is Since each can be rotated independently, the following effects are achieved.

[0025] (a) Achieving the original purpose of surface cleaning Prior to backwashing, the surface of the filter layer can be reliably washed. table The original purpose of surface cleaning is to destroy the fixed surface contaminant layer before backwashing and to prevent the subsequent turbidity. As a result of reliable layer separation, the effectiveness of backwashing can be further enhanced. Ru.

[0026] (b) Preventing filter media from flowing out A rotational phase difference occurs between the horizontal rotating tube on the surface of the filter layer and the horizontal rotating tube inside the filter layer, and the same Since the wake flow can be made small, it prevents the flow of filter media such as anthracite with low specific gravity. It can be prevented. The injection direction will be opposite to the upper and lower horizontal rotating tubes. A sea urchin fountain nozzle was installed and the vertical and horizontal rotating tubes were configured to rotate in opposite directions. In some cases, the entrained water currents cancel each other out, making the effect of preventing filter media outflow even more pronounced.

[Brief explanation of drawings]

FIG. 1 is a partially omitted front view of the device of the present invention.

FIG. 2 is a front view of a multi-stage horizontal rotary tube.

FIG. 3 is a diagram showing how a fountain nozzle is attached to a horizontal rotating tube installed on the surface of a filter layer.

FIG. 4 is a diagram showing how a fountain nozzle is attached to a horizontal rotating tube installed inside a filter layer.

FIG. 5 is a partially omitted front view of a conventional two-stage filter layer cleaning device.

FIG. 6 is a contamination distribution diagram in the case of two-layer filtration.

FIG. 7(a) is a diagram of a cleaning process using the device of the present invention, and FIG. 7(b) is a diagram of a cleaning process using a conventional device.

[Explanation of symbols]

1... Upper filter medium (filter layer surface) 2...Lower filter medium (filter layer boundary surface) 3...Horizontal rotating tube (on the surface of the filter layer) 4...Horizontal rotating tube (in the filter layer) 7...Fountain nozzle 8...Fixed water supply pipe 9...Rotating joint

Claims (1)

[Scope of utility model registration request] Claim 1: A cleaning system in which cleaning water is supplied from a fixed water supply pipe to a horizontally rotating tube, is sprayed from a number of injection nozzles provided on the horizontally rotating tube, and the horizontally rotating tube is rotated by the reaction force of the injection. In the device, a horizontal rotating pipe is installed on the surface of the filter layer and within the filter layer, a rotating joint is provided between the horizontal rotating pipe on the surface of the filter layer and the fixed water supply pipe, and a horizontal rotating pipe on the surface of the filter layer is provided. A filter layer cleaning device characterized in that a rotary joint is also interposed between a rotary tube and a horizontal rotary tube within the filter layer.