JPH044007A - Filter - Google Patents

Abstract

PURPOSE:To carry out continuous filtration by providing a partition plate for dividing the hollow rotating shaft of a cylindrical filter body into two sections in its axial direction, flow passages piercing the rotating shaft on both sides of the partition plate and contaminant exfoliating particles packed in the filter body. CONSTITUTION:A contaminated lid. is supplied to a filter body 4 from its one side, and the contaminant is discharged to the other side. In this case, hollow rotating shafts 5 and 6 of the filter body 4 are provided at the axial center of the filter body 4, the shafts 5 and 6 are divided by a partition plate 7 into two sections, flow passages 8 and 9 piercing the rotating shafts 5 and 6 are furnished on both sides of the partition plate 7, and further contaminant exfoliating particles 14 is packed in the filter body 4. Namely, the surface of the filter body 4 is automatically cleaned as the filter body is rotated, hence clogging in never caused, and filtration is continuously carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filter that is applied to a pretreatment device for a reverse osmosis membrane process.

[Conventional technology]

In reverse osmosis membrane seawater desalination equipment that produces water from seawater, removing contamination is an extremely important technology. There are microorganisms, suspended matter, etc. floating in the seawater, and if these suspended matter are brought into the downstream desalination equipment, they will cause vague contamination and deterioration sounds, so all of them must be removed using cleaning equipment. There is a need.

[Problem to be solved by the invention]

Conventionally, coagulating sand filters have been used as pretreatment equipment for reverse osmosis membrane processes, but they have had the following problems.

(1) A flocculating sand filter as a pre-treatment facility removes contaminants from the surface layer by passing gravel, sand, and anthracite over the water collecting device and passing raw water with a flocculant added over the top layer. As pollutants accumulate, the filtration head loss increases and the throughput decreases.

In order to recover from this problem, it was necessary to stop filtration and perform backwashing, making continuous operation impossible.

(2) In order to secure all the filters for backwashing, multiple sand filters were required.

(3) Furthermore, in the backwash operation, the filtration flow path must be shut off to create a backwash flow path, which requires a large number of piping and control valves, and requires complicated and expensive equipment.

The present invention aims to provide a filtration device that can solve the problems of conventional sand filters as described above.

[Means to solve the problem]

The filtration device of the present invention includes a cylindrical filter body, a polluted liquid is supplied from one side and pollutants are discharged to the other side, a hollow rotating shaft of the filter body is provided at the axis of the filter body, and a hollow rotating shaft of the filter body is provided with a hollow rotating shaft of the filter body. A partition plate divides the filter into two parts in the axial direction, a flow path is provided on both sides of the partition plate completely penetrating the hollow rotating shaft, and dirt-removing particles filled in the filter body are leaked.

[Effect]

In the present invention, the polluted liquid is supplied into the hollow rotating shaft from one side, and the polluted liquid enters the filter body rotated by the hollow rotating shaft from the flow path passing through the rotating shaft, and the polluted liquid is filtered by the filter body. It will be done. At this time, fine particles in the polluted liquid are captured on the inner surface of the filter body, and the filtered liquid passes through the filter body and is discharged.F'1. When the fine particles reach the bottom by rotation of the filter, they rotate while coming into contact with the dirt removal particles filled therein, and move upward. In this case, the dirt removal particles also move upward together with the filter, but when the balance between frictional force and gravity is lost, they slide downward. At this time, due to the frictional force, the particles f' captured on the inner surface of the filter are peeled off from the filter surface and suspended in the liquid. This suspension enters the discharge side of the hollow rotating shaft and is discharged out of the system.

As described above, as the filter rotates, its surface is automatically cleaned and no clogging occurs, allowing continuous filtration.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

Reference numeral 1 denotes a cylindrical filter outer cylinder, which has a filtered water outlet 2 at its upper part, and bearing seals 3a and 3b at its front and rear parts, respectively. A cylindrical filter body made of 4-piece stainless steel wire mesh, stainless steel and sintered metal, etc. One end of its axis is connected to a rotating suspension supply pipe 5, and the other end of its axis is connected to a rotating discharge pipe for suspended particles. 6, respectively. The suspension rotating supply pipe 5 and the suspended fine particle rotating discharge pipe 6 both serve as rotating shafts, and the hollow portions of the pipes are separated by a partition plate 7 at right angles to the shafts. They are connected in a straight line.

The rotating supply pipe 5 for the suspension and the rotating discharge pipe 6 for the suspended particulates have a supply liquid flow path 8 and a discharge liquid that are opened on both sides of the partition plate 7 inside the filter body 4 so as to pass through the pipes. A flow path 9 is provided. Furthermore, both ends of the suspension rotating supply pipe 5 and the suspended fine particle rotating discharge pipe 6 are rotary joints) 10a, 10.
They are respectively connected to a suspension supply pipe 11 and a suspended particulate discharge pipe 12 via b. The pulley is tightly coupled to the 13Fi suspended particulate discharge pipe, and the motor does not move freely.
Connected with a belt, etc.

14ii Filled inside the filter body 4 with sand, preferably d,
Made of stainless steel: Made of particles exclusively made of Akatsuki metal powder.

In this embodiment having the above configuration, the liquid containing suspended particles passes through the suspension supply pipe 11, the rotary joint 10a, and the suspension rotary supply pipe 5, and then enters the inside of the filter body 4 from the supply liquid flow path 8. guided by.

The suspended particles are captured on the inner surface of the filter body 4 by the filtration action, and the purified filtrate is taken out from the filtrate outlet 2. On the other hand, when the filter body 4 rotates and reaches the bottom, the suspended particles captured on the inner surface of the FiA body 4 rotate and move upward while coming into contact with the particles 14 filled at the bottom. In this case, the 14 particles move upward together with the filter body 4, but if the balance between frictional force and gravity is lost, they will slide downward. At this time, the suspended fine particles captured on the surface of the filter body 4 are subjected to a peeling action due to the frictional force, and are suspended in the liquid again. This suspension is sucked into the suspension rotary discharge pipe 6 from the discharge liquid channel 9, passes through the rotary joint 10b and the suspended particulate discharge pipe 12, and is discharged to the outside of the system.

As described above, in this embodiment C, the filter body 4 performs filtration while rotating, and the suspended fine particles captured and suspended on its inner surface are automatically peeled off from the inner surface of the filter body.
No clogging occurs. Therefore, filtration can be continued without performing operations such as backwashing.

〔Effect of the invention〕

The present invention can have the following effects.

(1) Since filtration, stripping, and washing are repeated while the filter body rotates, there is no risk of clogging, and it can be operated automatically and continuously for a long time.

(2) Therefore, there is no need for multiple filtration devices to ensure water flow during backwashing as in the past.

(3) The device can be simplified and control equipment can be omitted.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention. 1... Filter outer cylinder, 2... Filtered water outlet, 4...
Filter body, 5... Rotating supply pipe, 6... Rotating discharge pipe, 7
... Partition plate, 8... Supply liquid flow path, 9... Discharge liquid flow path, 10 a, 10 b...o-tally joint, 11... Suspension liquid supply pipe, 12... Suspended particle discharge tube, 14.-particles.

Claims (1)

[Claims] A cylindrical filter body, a polluted liquid is supplied from one side and pollutants are discharged to the other side, a hollow rotating shaft of the filter body is provided at the axis of the filter body, and the hollow rotating shaft is partitioned into two parts in the axial direction. A filtration device comprising a partition plate, a flow path provided on both sides of the partition plate passing through a hollow rotating shaft, and particles for removing contaminants filled in the filter body.