JPH04334530A - Filter apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device used in water treatment facilities.

0002

[Prior Art] Conventionally, in water treatment facilities where raw water is separated into solid and liquid using a filtration device using a UF membrane or MF membrane, raw water discharged from a pump is supplied parallel to the membrane surface of the filtration membrane. By applying a flow rate to the raw water parallel to the membrane surface of the filtration membrane, slag was prevented from adhering to the surface of the filtration membrane.

0003

[Problems to be Solved by the Invention] However, in the conventional configuration described above, the flux of raw water discharged from the pump is regulated by the shape of the outlet of the conduit through which the raw water is spouted, so it is not necessary to use the filtration membrane. There was a problem that it could not be suitable for the film surface of the film. For example, if a filtration device is configured by arranging multiple filtration modules in parallel with each other, each of which has a filtration membrane attached to the surface of a flat filter plate, the flux of raw water discharged from a circular pipe will be circular. The flux of raw water becomes non-uniform with respect to the membrane surface of the filtration module, and the flux is thicker in the center of the membrane surface and thinner on the sides, causing a problem where sludge adheres to and accumulates on the membrane surface. there were.

[0004] Furthermore, when attempting to make the flux to the membrane surface uniform, there is a problem in that the pump capacity increases and energy consumption increases. The present invention solves the above problems, and aims to provide a filtration device that can reduce power consumption and provide a uniform flux to the filtration membrane surface.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the filtration device of the present invention has a plurality of flat filtration modules immersed in a processing tank and arranged in parallel, and a proximal end of the filtration module is placed below the filtration module. A jet pipe whose side communicates with the pump is provided along the arrangement direction of the filtration modules, a plurality of discharge ports for discharging a jet upward are provided in the jet pipe, and a jet pipe is provided between the filtration module and the jet pipe in the width direction of the filtration module. The structure is such that a jet guide is interposed to form a flow path with a uniform width.

[0006] Also, a casing is provided in the lower part of the filtration module to enclose the jet guide. Furthermore, the configuration is such that diffuser pipes are provided inside the casing on both sides of the jet guide.

[0007]

[Operation] In the above structure, the mixed liquid in the processing tank is separated into solid and liquid by the filtration membrane of the filtration module, the filtrate that has passed through the filtration membrane is taken out of the processing tank through the filtration module, and the solid content is removed from the filtration membrane. Adheres to surfaces. On the other hand, the jet of liquid or gas discharged from the outlet of the jet tube becomes an upward flow and passes through the jet guide. At this time, the upward flow attracts the mixed liquid in the processing tank from around the jet guide, and it is ejected from the jet guide toward the filtration module as a flux of uniform width, and is applied to the membrane surface in the gap between the filtration modules. It flows in parallel to the flow. For this reason, the membrane surface of the filtration module is exposed to an upward flow parallel to the membrane surface, and the cleaning power of the upward flow on the membrane surface becomes uniform, causing slag to adhere to the membrane surface of the filtration module. It is prevented in all aspects. Therefore, by adjusting the flux shape of the jet flow while entraining the surrounding mixed liquid in the jet flow guide, the membrane surface can be efficiently cleaned, and an increase in pump output and capacity can be avoided, leading to a reduction in energy consumption. It will be done.

[0008] Further, by providing the casing, dissipation of the upward flow is suppressed, and formation of a flux with a uniform width of the upward flow is promoted. Furthermore, by diffusing aeration air from the aeration pipe, an upward flow is formed by the air lift effect of the diffused air, and the upward flow is blown up toward the filtration module from both sides of the jet flow guide. This makes it possible to reduce the amount of jet discharged from the jet pipe and further reduce energy consumption.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, a plurality of filtration modules 2 are arranged in parallel inside a processing tank 1. As shown in FIG. 2, this filtration module 2 is formed by pasting filtration membranes 4 on the front and back sides of a flat filter plate 3, and a filtrate flow path is formed between the filter plate 3 and the filtration membrane 4. A spacer 5 is interposed for this purpose. Each filtration module 2 also communicates with a filtrate header pipe 7 via a filtrate suction pipe 6 provided in communication with the filtrate flow path of the filter plate 3, and the filtrate header pipe 7 communicates with the suction side of a suction pump 8. are doing.

Near the bottom of the processing tank 1, a jet pipe 9 is installed below the filtration module 2 along the direction in which the filtration modules 2 are arranged. A plurality of discharge ports 10 are provided for discharging a jet stream toward 2. Further, a submersible pump 11 is connected to the base end side of the jet pipe 9. Note that when air is discharged from the discharge port 10 of the jet tube 9, the base end side of the jet tube 9 communicates with a blower (not shown).

A jet guide 12 is provided between the filtration module 2 and the jet pipe 9, and the jet guide 12 forms a frame with open upper and lower ends and extends in the width direction of the filtration module 2. A flow path with a uniform width is formed.

Further, at the lower end of the filtration module casing 13 provided surrounding the filtration module 2, a jet flow guide 12 is provided so as to surround the lower area of the filtration module 2.
A guide casing 14 is provided so as to enclose the jet flow guide 1 inside the guide casing 14.
A pair of air diffusers 15 are provided on both sides of the air diffuser 2. The proximal end side of the aeration tube 15 communicates with a blower (not shown), and the aeration tube 14 is provided with a plurality of aeration holes 16 for blowing out aeration air. Furthermore, processing tank 1
A raw water supply pipe 17 is open on one side.

The operation of the above configuration will be explained below. Raw water flows into the mixed liquid 18 retained in the treatment tank 1 from the raw water supply pipe 17 . The filtration module 2 receives negative pressure from the suction pump 8 and transfers the mixed liquid 18 in the processing tank to the filtration membrane 4.
solid-liquid separation. Further, the filtrate that has passed through the filtration membrane 4 flows into the filtrate header pipe 7 through the filtrate channel of the filter plate 3 and the filtrate suction pipe 6, and passes through the suction pump 8 to reach the next system. Further, the separated solid content adheres to the filter membrane 4.

On the other hand, the mixed liquid 18 in the processing tank 1 supplied by the submersible pump 11 is discharged as a jet from the outlet 10 of the jet pipe 9 and passes through the jet guide 12 in an upward flow. At this time, the upward flow attracts the mixed liquid staying inside the processing tank 1 from around the jet guide 12, is rectified into a flux of uniform width in the jet guide 12, and is then jetted toward the filtration module 2. The water flows into the gap between each filtration module 2 as a flow parallel to the membrane surface of the filtration membrane 4.

Therefore, the membrane surface of the filtration membrane 4 of the filtration module 2 is exposed to the upward flow parallel to the membrane surface, and the cleaning power of the upward flow on the membrane surface becomes uniform, so that the filtration membrane 4 of the filtration module 2
This prevents filter dregs from adhering to the membrane surface over the entire surface of the filter membrane 4. Therefore, in the jet guide 12,
By adjusting the flux shape of the jet flow while drawing in the surrounding mixed liquid 18, the membrane surface can be efficiently cleaned, and an increase in the output and capacity of the pump 11 is avoided, thereby reducing energy consumption.

Furthermore, the guide casing 14 regulates the flow path of the upward flow that is rectified into a uniform width flux in the jet flow guide 12 and then jets out toward the filtration module 2, thereby suppressing the diffusion of the upward flow. It also promotes the upward flow to form a uniform width flux.

Furthermore, the aeration air discharged from the air diffuser holes 16 of the air diffuser pipe 15 forms an upward flow due to the air lift effect, and the upward flow blows up toward the filtration module 2 from both sides of the jet flow guide 12 as well. In addition, the guide casing 14
prevents the dissipation of diffused air bubbles and promotes the upward flow to form a flux of uniform width. This makes it possible to reduce the jet amount of the mixed liquid 18 discharged from the jet pipe 9 and further reduce energy consumption.

Furthermore, in this embodiment, the submersible pump 1
Although the mixed liquid 18 supplied by 1 is made into a jet stream, it may also be made into a jet stream by discharging air from the jet pipe 9.

[0019]

Effects of the Invention As described above, according to the present invention, by adjusting the flux shape of the jet while involving the surrounding mixed liquid in the jet guide, a uniform upward flow of the flux can be achieved on the membrane surface. The membrane can be formed and cleaned efficiently over the entire surface of the membrane, and an increase in pump output and capacity can be avoided and energy consumption can be reduced.

Further, by providing the casing, it is possible to suppress the dissipation of the upward flow and promote the formation of a flux having a uniform width. Furthermore, by blowing upward flow toward the filtration module from both sides of the jet guide due to the air lift effect of the air, it is possible to reduce the amount of jet discharged from the jet pipe and further reduce energy consumption.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a filtration device showing one embodiment of the present invention.

FIG. 2 is a sectional view of the filtration module in the same embodiment.

FIG. 3 is a sectional view taken along the line A-A in the same embodiment.

[Explanation of symbols]

1 Processing tank 2. Filtration module 4 Filtration membrane 9 Jet pipe 12 Jet guide 15　Air diffuser pipe

Claims (3)

[Claims] 1. A plurality of flat filtration modules immersed in a processing tank are arranged in parallel, and below the filtration modules, a jet flow pipe whose base end side communicates with a pump is provided along the arrangement direction of the filtration modules, The jet tube is provided with a plurality of discharge ports for discharging jets upward, and a jet guide is interposed between the filtration module and the jet tube to form a flow path with a uniform width in the width direction of the filtration module. A filtration device. 2. The filtration device according to claim 1, further comprising a casing provided at the bottom of the filtration module so as to enclose the jet guide. 3. The filtration device according to claim 2, further comprising a diffuser pipe provided in the casing on both sides of the jet guide.