JP2803041B2 - Filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for filtering water, wastewater and other liquids.

[0002]

2. Description of the Related Art A filter medium is provided with sand as a filter medium, and the sand is passed through water or the like to perform a filtering operation.

[0003]

Sand is generally used as a filter medium for filtering water and the like. However, in recent years, due to the deterioration of the water environment, filtration of raw water in the treatment of water, filtration after coagulation and sedimentation, or sewage wastewater has been carried out. In the filtration of the next treated water, etc., the sand filtration increases the load of suspended or suspended substances, and often causes a decrease in the filtration function such as a reduction in the duration of filtration, incomplete backwashing, and blockage of the filter bed. ing. In addition, a depletion of resources makes it impossible to withstand demand, and a filter using a new filter medium is desired.

[0004]

A core member of a filter medium made of a material that can be bent and deformed in a longitudinal direction, such as a plant fiber or a resin fiber, is provided at an appropriate position on a perforated plate such as a perforated plate constituting a filter medium support floor of a filtration chamber. At one end, a suitable number of the filter media were housed in a filtration chamber, and the filter media was composed of the core member and countless capture yarns radially attached to the core member along the longitudinal direction thereof, Means are used, and in addition to this means, the density of the captured yarn is gradually reduced from one end of the core member toward the other end, or the density of the captured yarn is changed depending on the diameter of the captured yarn.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a filter according to an embodiment of the present invention. FIG. 2 is a perspective view of a filter.

In the drawing, reference numeral 1 denotes a filtration chamber, and the filtration chamber 1 is a perforated plate 3 such as a mesh plate or the like which constitutes a filter medium support floor and is laid in the inner wall 10 'of the filtration tank 10 and the filtration tank 10. 10 is partitioned and configured.

The filtration chamber 1 has an inlet 2 and an air vent 4 on the upper side, an outlet 5 on the lower side, and an outlet 5
And a cleaning air pipe 6 interposed between the perforated plate 3 and the perforated plate 3.

FIG. 7 shows a filter medium attached to an appropriate position of the perforated plate 3 and appropriately provided in the filtration chamber 1. The filter medium 7 is made of a material that can be bent and deformed in the longitudinal direction. The catch yarns 9a, 9b, and 9c are formed.
b, 9c are attached to the core member 8 radially from one end to the other end (longitudinal direction), and a group of capture threads 9a, 9a,... The first filter layer 9A, and a group of the largest diameters 9c, 9c,
Are arranged on the other end side of the core member 8 to form a third filter layer portion 9C, and the second filter layer portion 9B interposed between the first filter layer portion 9A and the third filter layer portion 9C is provided with a trapping yarn 9a. And a group of capture yarns 9b, 9b,... Having a diameter larger than the capture yarn 9c.

Then, an appropriate number of filter media 7,
.. With one end of the core member 8 (the first filter layer portion A side)
, 9b ..., 9c ... in the filtration chamber 1.
The first, second, and third filter layers 9A, 9B, and 9C are provided.

The core member 8 is made of a twisted yarn made of polyester fiber and having a diameter of about 4 mm.
The capture thread 9b is made of polyester fiber having a thread diameter of 88 μm, and the capture thread 9c is made of polyester fiber having a thread diameter of 124 μm, but nylon, polyvinyl chloride, other resin fibers or plant fibers can be used as the material. Thread 9a,
The yarn diameters of 9b and 9c do not need to be limited to the examples.

When untreated water is injected through the injection port 2, the untreated water is supplied to the third filter layer section 9C and the second filter layer section 9C.
B and the first filter layer portion 9A are sequentially filtered, and the filtrate is sequentially filtered from the largest suspended or suspended matter, and the treated water is recovered through the outlet 5.

When backwashing water is injected from the discharge port 5 side, the core member 8 of the filter medium 7 that has been bent and deformed by its own weight.
The one end is attached to the perforated plate 3 and rises and extends in the flow direction of the backwash water, while the capture yarns 9a, 9b and 9c also extend in the flow direction of the backwash water, and 9a
, 9b ..., 9c ..., the suspended substances and the like are scraped off by backwash water, and a backwash operation is performed.

The first to third filter layers 9A, 9
B and 9C indicate the density (capture density) of the filter layers 9A, 9B and 9C due to the difference in the yarn diameter of the capture yarns 9a, 9b and 9c.
Are sequentially increased from the upper side (third filter layer portion 9C side), but it is also possible to configure each filter layer portion with the same catching yarn and change the density by changing the number of catching yarns.

Of course, the filter layer may be formed by arranging the same density at the same density from one end of the core member 8 to the other end thereof.

In the filtration apparatus of the embodiment, untreated water flows downward from above and backwash water flows downward from above at the time of backwashing. It may be attached to the upper side of the filtration chamber to flow untreated water from below to above and backwash water from above to below.

The present invention can of course be applied to gravity filtration.

[0017]

The present invention has the configuration described above,
It is possible to provide a practical filtration device that can cope with the depletion of sand resources, has a filtering function similar to that of a device using sand as a filter material, and can reliably perform a backwash operation because one end of a core member of the filter material is attached. .

In addition, according to the second aspect of the present invention, efficient filtration and backwashing operations can be performed because trapping is carried out step by step from a large substance such as a suspended substance to a small substance.
Further, according to the third aspect of the present invention, an even more efficient filtration operation can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view.

FIG. 2 is a perspective view of a filter medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration chamber 3 Perforated plate 7 Filter material 8 Core member 9a, 9b, 9c Capture thread

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-47-18935 (JP, A) JP-A-54-124374 (JP, A) JP-A-1-304011 (JP, A) 22676 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B01D 29/08 B01D 46/28 B01D 23/10

Claims (3)

(57) [Claims] An end of a core member of a filter medium made of a material that can be bent and deformed along a longitudinal direction, such as a plant fiber or a resin fiber, is attached to an appropriate position of a perforated plate such as a perforated plate constituting a filter medium support floor of a filtration chamber. And a filter device comprising an appropriate number of the filter media housed in a filtration chamber, and the filter media comprising the core member and countless capture threads radially attached to the core member along the longitudinal direction. 2. The filtration device according to claim 1, wherein the density of the captured yarn is gradually increased from one end of the core member to the other end. 3. The filtering device according to claim 2, wherein the density of the captured yarn is changed depending on the diameter of the captured yarn.