JPS5867308A - Filter for washing filter medium by circulation - Google Patents

Abstract

PURPOSE:To provide a compact and energy-saving type filter obtained by installing a washing pipe in a filter layer, in which water freely passes in the horizontal direction, and jetting a pressurized fluid from an injection nozzle to circulate granular media through the inside of a washing pipe which washing the media. CONSTITUTION:Raw water is fed from a supply pipe 24 and is passed through a flow-in chamber 17 of a filter layer 15 and a water gathering chamber 19, and clarified water is recovered to a recovery pipe 27 from a water gathering trough 25. When the need to wash granular filter media L and S occurs, a fluid is jetted from an injection nozzle 29 to blow up the media L and S, gathered along the surface of a slanted bottom 12 to the lower side of an opening port 20a of a washing pipe 20. thereby agitating and floating the media to wash them and discharging them together with waste washing water to the upper side of the layer 15 from the top end of the washing pipe 20 through a charging port 21. Thus the fine granular media S are concentrated to be stacked on the side of the chamber 19 and the coarse media L are stacked on the side of the chamber 17, respectively and then the media L and S are classified in the horizontal direction. Further the discharged waste washing water is exhausted out of a tank through an exhausting pipe 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration device that performs clarification by passing water through a granular filter layer.

A typical filtration device using a conventional granular filter medium is illustrated in FIG. A support bed 3 is provided at the bottom of the filtration layer 1 to form a water collection and distribution chamber 2, support gravel 4 is laid on this support bed 3, and a filtration layer 5 (mainly crushed sand) is placed on top of this support gravel 4. It is filled in a layered manner, and a water supply and drainage gutter 6 is provided above the layered filter vortex layer 5.

The raw water tank 7 is provided with a water supply pump 8 and connected to the water supply and drainage gutter 6, and the treated water tank 9 is communicated with the water collection and distribution room 2, and a backwash pump 10 is provided in the middle. Further, the drain valve 11 is connected to the water supply and drainage gutter 6.

When raw water is supplied from the raw water tank 7 to the water supply and drainage gutter 6 by the water supply pump 8, when the raw water overflows the water supply and drainage ffi 6 and passes through the filtration layer 5, the turbidity in the raw water becomes attached to the filter vortex layer 5.
FL, clear water flows down through the supporting gravel 4 and the supporting bed 3, flows from the water collection and distribution chamber 2 into the treated water tank 9, and is collected.

When the amount of suspended matter trapped in the filtration layer 5 increases, the supply pump 8 is stopped, and the backwashing pump 10 blows the clear water in the treatment tank 9 upward from the water collection and distribution chamber 2 to stir and float the filtration layer 5. and wash. The filtration slag floating between the floating filtration layers 5 flows into the water supply and drainage gutter 6 and is then discharged through the drain valve 11.

However, as shown in FIG.
The fine grain sand 5b is classified as a lower layer and the fine grain sand 5b is classified as an upper layer, and the filter slag is retained in the fine grain sand 5b in the upper layer to speed up the blockage of the filter vortex layer. Therefore, it is necessary to repeat cleaning frequently to eliminate blockages in the filtration J.n.

As a countermeasure against this problem, as shown in Fig. 3, the raw water tank 7 is connected to the water collection and distribution room 2, and the water supply and drainage gutter 6 is connected to the treated water tank 9. On top of the layer and fine crushed sand 5b layer, a granular filter material 5c (for example, anthracite, coal grains, etc.) having a specific gravity of water and crushed sand 5a, 5b and larger than the crushed sand 5a (for example, anthracite, coal grains, etc.) is filled in a layer. Upflow filtration devices in conjunction with vortex beds have also been used.

However, with these devices, each time the filtration vortex layer becomes clogged with turbid matter, the filtration system must be completely cleaned with water several times the volume of the filtration flow. This method requires a pump and a backwash water storage tank, which has the disadvantage of increasing the size of the equipment.

In view of the above drawbacks, it is an object of the present invention to provide a small and energy-saving filtration device that combines a small washing facility (+iij) and gravity water flow.

The purpose of this invention is to attach a cleaning pipe 20 facing the jet [[29] to a filter vortex layer through which water can freely pass by gravity in the horizontal direction;
The intention is to circulate the filter medium from the lower layer of the filtration vortex layer to the upper layer of the stomach while washing it.

In other words, the material circulation cleaning type filtration device of this invention is also!
In a filtration device in which raw water flows in from one side of a filter vortex layer filled with horizontally classified filter media and clear water flows out from the other side, the lower end of the inclined bottom and the upper part of the body are connected. The present invention is characterized in that a communicating cleaning pipe is provided, and an injection port is provided below the cleaning pipe facing the opening at the lower end of the cleaning pipe.

An embodiment of this invention will be explained with reference to FIG.

FIG. 5 is a longitudinal sectional view. In the figure, a t1-shaped thermometer 13 is connected to a funnel-shaped inclined bottom 12 to form a filtration layer 14.
, 4, and the inflow side support frame 16 is set up almost vertically, and an inflow chamber 17 is formed at 1111 with the temperature measurement 13. The inflow side support frame 16 is constructed by stacking a large number of filter medium support plates 16a that are inclined downward toward the center of the filter tank 4 at appropriate intervals 19, and has a partition wall 16b extending upwardly at the top stage. It was established.

In addition, a water collection side support frame 18 having an appropriate inner diameter is installed approximately vertically in the center of the filtration layer 14. This water collection side support frame 18
is a large number of filter media support plates 18 that are inclined downwardly toward the outside.
A are stacked at appropriate intervals, and a tubular portion 18b extending upward is provided at the top. Further, in the center of the filtration layer 14 in the water collection side support frame 18, a cleaning pipe 20 having an inverted funnel-shaped opening 2+')a at the lower end is erected at an appropriate distance from the inclined bottom 12. , a water chamber 19 is formed between the water collection side support frame 18 and the water collection side support frame 18 . Then, the upper end of the cleaning pipe 20 is connected to the downwardly directed material membrane inlet 21, and the vicinity of the upper end and the upper end of the tubular part 18b of the water collection side support frame 18 are connected via the inclined surface 22, and the tubular part Seal the upper end of 18b. Therefore, the inflow side support frame 16 and the water collection side support frame 1
In the filter medium storage chamber between 8 and 8, put a set filter medium and a fine filter medium S, with the coarse filter medium on the inflow side support frame 16 side and the fine filter medium S on the water collection side support frame 18 side, They are stacked almost vertically to form a packed vortex layer 15. And the inflow side support frame 16
At a position lower than the upper edge of the y partition wall 16b, the inflow chamber 17
and a raw water tank 23 outside the tank are communicated via a raw water supply pipe 24. In addition, a water collection gutter 2 is located above the filtration inside the partition wall 16b and lower than the communication position of the raw water supply pipe 24.
5 is provided so that it communicates with the water collection chamber 19 via the water collection pipe 26, and also with a recovery pipe 27 outside the tank. Rough filtration +1
- An inlet 28a of a washing drain pipe 28 communicating with the outside of the premises is opened above the pipe 115. Furthermore, a fluid such as pressurized air is ejected from the lower end of the inclined bottom 12 facing the lower end opening 20aK of the cleaning pipe 2o.

The operation of the above configuration will be explained next.

When the raw water is introduced from the light heavy raw water supply pipe 24, a horizontal width flow is induced in the raw water from the inflow chamber 17 to the water collection chamber 19 in the filtration vortex layer 15 due to the head difference between the raw water supply pipe 24 and the recovery pipe 27. Ru.

The support frames 16 and 18 almost vertically support the filter vortex layer 15 filled with the granular filter LXS, and allow a horizontal wide flow to freely pass through the filter vortex layer 5 to clarify the raw water. to filter.

Clear water with little filtration rises in the water collection chamber 19, passes through the water collection pipe 26, enters the water collection gutter 25, and is collected outside the tank through the collection pipe 27.

When the granular suspended solids removed by the filtration and suspended in the S reach a specified amount, the fluid is jetted from the injection port 29 and flows along the slope of the inclined bottom 12 to the opening 20a of the cleaning pipe 20. The granular filter media L1S gathered at the bottom are spouted up, stirred and floated in the cleaning tube 20, brought into contact with each other for competitive cleaning, and then passed from the upper end of the cleaning tube 20 through the inlet 21 to the upper part of the filter vortex layer 15 together with the cleaning waste water. discharge. At this time, the water collection side support frame 18
Since the upper ends of the two tubular portions 18b are sloped surfaces 22, the granular filter media JS discharged from the Chita 1 side 22 becomes a chute and is not guided onto the filtration J'tff15.
The water collection chamber 19 side forms a high slope 11f1. Due to this slope, the fine filter media S is concentrated and stacked in the water collection chamber 19 (1111), and the coarse filter media S is concentrated and stacked on the inflow chamber 17 side.In other words, the granular filter media 1.s are sorted horizontally. do.

When the granular filter material S is blown up into the cleaning pipe 20 by the washing, the granular filter material S at the lower end of the filtration swirl layer 15 flows along the inclined bottom 12 and reaches the opening Oa of the cleaning pipe 20. The filter vortex layer 15 gradually descends to form the above 6().
It is possible to continue purification. Moreover, this washing can be carried out freely at any time required without stopping the filtration using the horizontal wide flow.

After washing, the granules are filtered and washed together with S, which is discharged to the outside of the tank through the washing waste water d discharged onto the filtration vortex layer 15 and the washing drain pipe 28.

Note that the filtration device of the present invention may be configured as follows.

1. A recovery water overflow tank 31 and a wastewater overflow tank 32, which are equipped with an adjustment jγ 30, are installed in the speed of the recovery pipe 2 and the cleaning drain pipe 28 to finely adjust the filtration flow and the cleaning flow. .

2. A water supply pipe 3 that communicates with the raw water supply pipe 24 to the injection port 29
3 are combined to adjust the cleaning flow of the cleaning pipe 20.

6. In the above description, the support frame 16.18 is connected to the cylindrical filter layer 1.
Although the example in which the support frame 1 is provided concentrically within the support frame 1 has been described,
6.18 and the filter layer 14 may have a polygonal or other shape.

As mentioned above, in the filter suspension fi't of the present invention, a cleaning pipe is attached to the filter vortex layer that can freely pass water in the horizontal direction, and pressurized fluid is jetted from the injection port to clean and circulate the granular filter media within the cleaning pipe. Since it is designed to do this, a large backwash pump is not required. Therefore, the NIF can be made smaller and has the advantage of saving energy.

[Brief explanation of the drawings] Fig. 1 is an explanatory diagram of a conventional general gravity filtration system, Fig. 2 is a filter medium particle size distribution diagram of a single-layer filter swirl layer, and Fig. 3 is a conventional upward flow filtration device. FIG. 4 is a filter medium particle size distribution diagram of a multi-layer filter swirl layer, and FIG. 5 is a longitudinal sectional view showing an embodiment of the present invention. 12: Inclined bottom, 13: Tank circumference, 20: Washing pipe, 29: Injection port, LNio and λ stand #, S2≠・ll3#L filter material agent Patent attorney Takashi Honma 43

Claims (1)

[Claims] In a filtration device in which raw water flows in from one side of a filter vortex layer filled with horizontally classified granular filter media, and clear water flows out from the other side, the lower end of the inclined bottom and the upper part of the dandelion are connected. A filter medium circulation cleaning type filtration device, characterized in that a cleaning pipe is provided, and an injection port facing the opening [1] at the lower end of the cleaning pipe is provided below the cleaning pipe.