JPS6090013A - Filtering apparatus - Google Patents

Abstract

PURPOSE:To prevent the flowing through phenomenon of a filter material during washing by performing washing with good efficiency, in the filter apparatus of Fe-Ni slag equipment, by connecting a filter pipe to a backwashing line while pressing a filter material layer by a metal net. CONSTITUTION:Granulated slag and granulating water are charged into a filter tank 2 from a flow slag trough 1 and granulated slag is left on the upper surface of a filter layer 3 in a layered form while granulating water is filtered and passes a water drain pit 15 from the drain hole 11 of each filter pipe 4 while receiving filtering to be discharged to a drain line. The pipe is arranged so as to provide a drain gradient in order to facilitate discharge. After filtering work is finished, granulated slag on the upper surface of the filter layer 3 is discharged by a crane and a valve 16 is subsequently opened and seawater is sent to the filter pipe 4 under pressure from a backwashing line to wash the same. Washing is performed so that one set consisting of two filter pipes is backwashed six times successively from the end of the tank. During backwashing work, the filter material layer is pressed by a press layer such as a metal net.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration device used, for example, as Fe--Ni rice granulation treatment equipment.

Large IN (7) 11 (S
io2: 50.32X, MgO2: 24.85%, C
aO: 17. O, lX, FeO3: 3.34'3%
, ) are discharged, but this discharged waste is pulverized finely with seawater and treated. At this time, the granulated water that has been subjected to the granulation process is led to a filtration tank to separate the granulated water U from the seawater.

However, in conventional filtration devices, there is a problem in that it is difficult to efficiently remove clogging of the filtration layer and regenerate it.

In view of the above-mentioned points, the present invention enables efficient cleaning for removing clogging of the r filter layer, and furthermore, makes it possible to clean the filter medium at the time of cleaning by removing clogging of the filter layer. The object of the present invention is to provide a filtration device which prevents this phenomenon.

Therefore, the filtration device of the present invention has a plurality of porous filtration pipes in the filtration layer at the bottom of the r-filtration tank, and one end of the r-filtration pipes is located in the filtration layer. The other end of the filtration pipe is connected to a backwash line for backwashing the filtration pipe with high-pressure water or high-pressure gas. More desirably, the milling layer is formed of pebbles or gravel, etc., and a porous sheet-like pressing layer formed of a mat, wire mesh, etc. is provided on the surface of the suitable material layer. It has a structure in which

The present invention will be explained below with reference to an embodiment shown in the drawings.

FIGS. 1 and 2 are a sectional view of a filtration device and an enlarged sectional view of a filtration device according to the present invention.

In the filtration device of this embodiment, crushed water and seawater are introduced into the filtration tank 2, which is guided by the flow gutter 1, and the filtration layer 3 at the bottom of the filtration tank is It has a basic structure in which the filtered liquid (crushed water) is discharged from a porous filtration pipe 4 inserted in the microfilter chamber 3.

Therefore, the above [r]
The second formed by stacking pebbles from 2 to 18II11:
A filter material layer 6, a 33rd P suitable material layer 7 formed by stacking pebbles with a diameter of 9 to 12III11, and a 33rd P suitable material layer 7 with a diameter of 5 to 9
A fourth filtering material layer 8 formed of II1m gravel, a first pressing layer 9 formed of a water permeable mat such as Saran mat or nonwoven fabric laid on the surface of the second filtering material layer, and It is formed by laminating a second pressing layer 10 made of a wire mesh or a perforated plate provided on the surface. [Above] The depth of the over-evacuation is approximately 60 cm, and the first EJ
'The depth of the over-material layer 5 is 40 cm, the 23rd p over-material layer 6 and the third
The depth of the 37' suitable material layer 7 is 5 cffl, the depth of the 43rd filter material layer 8 is 1 cffi, and the thickness of the first presser layer 9 is 2.
It is 5cm.

Next, the filtration pipe 4 is inclined in the discharge direction and has a large number of drainage holes 11, and the filtration pipe 4 has a large number of drainage holes 11, and has a suitable material layer 5.
In the inside of ': r beam material 12 J of the lower surface of the tank 2
: is placed through a rubber mer/) 13. Both ends of this filtration pipe 4 protrude through the opposing wall surface of the filter tank 2, one end is connected to a water extraction line from an adjacent water extraction pit 15 via a rubber joint 14, and the other end is connected to a water extraction line through a rubber joint 14. 16 - The adjacent backwash bit 17 is connected to the backwash line via a wire. Water or gas for backwashing the filtration pipe 4 is fed under pressure from this backwash line. 18 is a flexible seal.

This [r filtration pipe] is installed in the r filtration tank 2 in a set of 6
A total of 12 trees are arranged. The diameter of each filtration pipe 4 is 20cI11.20 drainage holes 11 are provided at a pitch of 30+wm, and the diameter of each drainage hole 11 is 6mm.

]- In the embodiment described above, as described above, the] r overtank 2
When granulated water and granulated water are poured into the tank from the flow channel 1, the granulated water U becomes a layer and remains on the -L surface of the return 3, and the granulated water is returned by the return 3] The water is filtered and discharged from the water drain hole 11 of each filter pipe 4 through the water drain pit 15 to the water drain line. This discharge is easy because the filtration pipe has a drainage slope. A part of this discharged overculture is used as circulating water for the granulated water, and the rest is discharged into the sea or the like.

1) After completing the above work, move out using a crane, etc. 3-
The granulated water on the L side is discharged, but each ': filtering vibrator 4 is
Since it is supported by a flexible structure made up of a rubber mat 13 and a flexible seal 18, when the crane packet lands on the floor, 1 m is absorbed and there is no risk of damage to the filter pipe. After these operations are completed, the valve 16 is opened, and backwash saving seawater is forcedly sent from the backwash line to each of the r filtration pipes for cleaning. This backwashing method is a sequential backwashing type in which a set of two filtration pipes are backwashed six times in order from the end of the tank.

The reasons for this sequential backwashing method are: (1) If the entire tank is backwashed at the same time, the parts of the filtration material with low resistance will be preferentially backwashed, making it impossible to expect uniform backwashing over the entire surface.

■ The remaining slag can be spread over the entire surface of the tank, reducing dead space in the tank.

<j) ] Less damage is caused in the event of trouble such as breakage of the p-filtration plate.

etc.

Such backwashing work can be carried out for about 30 minutes after 8 hours of overflow work and 1 hour of U extraction work using the primary crane.

As mentioned above, the filtration layer 3 has a devised laminated structure and is less prone to clogging, but during the backwashing process, the filtration material layer is held down by a holding layer such as a wire mesh, so the filtration material layer is No blow-through or reversal of large and small filter media occurs, and the filter pipe and filter layer are effectively cleaned.

According to the present invention, the filtrate is discharged to the outside of the tank through the porous filtration pipe inserted in the filtration layer, and backwash water or air is forced into the filtration pipe from the backwash line. As a result, the clogging of the filtration layer and the filtration pipe is effectively eliminated, and the hyperactivity rate is reduced. Further, by covering the upper surface of the filtration material layer with a pressing layer such as a wire mesh, blow-through or reversal of the filtration material during backwashing can be prevented.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the p-filtration device according to the present invention, and FIG. 2 is a cross-sectional view of the same filter layer. 2...] r filtration tank, 3...] r filtration layer 4
...'; r-pass pipe, 5.6.7.8 ... ]
r over-material layer, 9, lO... presser layer, 11...
Drain hole. Patent applicant: Japan Mining Co., Ltd. Agent: Patent attorney: Norimitsu Tetsuzai

Claims (2)

[Claims] (1) A filtration device having a plurality of porous filtration pipes within a filtration layer at the bottom of a filtration tank, one end of the filtration pipe passing through the filtration layer and being discharged into the filtration pipe. The other end of the filtration pipe is connected to the extraction line of
A filtration device characterized by being connected to a backwash line for backwashing a filtration pipe. (2) Claim 1, wherein a porous sheet-like pressing layer formed of a mat, wire mesh, etc. is formed on the surface of the above-mentioned r filtration layer, a filtration layer formed of pebbles, gravel, etc. A device that performs the filtration described.