JPS5858118A - Open type gravitational filtration basin - Google Patents

Abstract

PURPOSE:To automatically dispose initial water of filtration having possibility containing foreign matters by a relatively simple structure, in a filtration basin using the filtrate of the adjacent filtration basin as washing water, by specifically providing a water disposing and washing water siphon tube and a water collecting ditch. CONSTITUTION:A lower water collecting chamber 4, a water drainage ditch 13 and water disposing and washing water spihon pipes 15, 16 respectively opened to a water collecting ditch 5 in communication with the chamber 4 and each adjacent water collecting ditches are provided. In addition, the ditch 5 is divided into the side of the chamber 4 and the side of a filtrate weir 18 including the pipe 16 and a partition plate 6 lower than the weir 18 is provided. When a filter floor 2 is got into filtration difficulty due to the accumulation of foreign matters, a backwashing water drainage siphon pipe 12 and the pipe 16 are acted to release the action of a raw water inflow siphon pipe 10. By this mechanism, water in a water drainage chamber 11 is discharged in the order of the ditch 13 a weir 21 a pipe 14 and, when the water level of the filtration basin 1 is fallen bellow the upper end of the weir 18, washing water from the ditch 5 is flowed in the order of an orifice 22 the chamber 4 a water passing plate 3 the basin 1 to wash the floor 2 and discharged along the route of a trough 7 a chamber 11 the pipe 12. After washing, the action of the pipe 12 is released and the pipe 10 is acted and, when the water level in the basin 1 is flushed with the weir 8, the action 16 is released. Subsequently, the pipe 15 is acted and initial water of filtration is discharged from the chamber 4 by the ditch 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an open-force type filtration system.
The purpose is to provide a filtration pond that can easily discard filtrate containing X substance during one transit period after cleaning the filter medium.

Conventionally, when filtration is continued for a long time in an open type filtration basin, foreign matter in the raw water accumulates on the bed surface rIIJ, clogging the filter bed, and the key is to continue filtration.

Therefore, a rise in the c1 overflow level due to an increase in overflow resistance is detected, and a flow rate of water that is 5 to 10 times the filtration rate is sent to the lower water collection chamber to fully expand one bed.

Backwashing is performed to remove and wash away foreign matter and suspended solids that have accumulated on the surface of the filter. After reflux - When moving to the filtration process, the filter bed is not stable enough, so 4.
There is a possibility that foreign matter may be contained in the initial overflow water, so it is difficult to discard the water until the m shore is sufficiently stable and then sample the water.

However, it was only temporary using the siphon tube.

In view of the structure and cost of the filter basin, it is difficult to automatically and precisely discard water. For example, wash water is replenished from another filter basin. For filter ponds with a common water collection channel, instead of discarding water, methods are used such as performing the initial stage of filtration at a low speed, or diluting filtrate containing foreign substances with filtrate water from other filter ponds. ing. In addition, there are some systems, such as the one disclosed in Special Publication No. 54-20029, in which the water disposal process is automatically carried out using a waste water siphon pipe, but a washing ice chamber for storing washing water and a device for replenishing washing water are installed. equipment costs will increase.

The present inventors solved the above-mentioned drawbacks and created a 1$1 filtration basin that uses filtrate water from other adjacent filtration basins as washing water.
The present invention was completed as a result of extensive research into how to automatically dispose of water in the Wi dormitory.

That is, in the present invention, a plurality of filtration basins are divided by partition walls and arranged in a row, and each filtration basin has a common raw water conduit.

A drainage ditch and a filtration ditch are installed, and each of the above-mentioned filter basins is equipped with:
A filter bed is installed on the water passage plate that divides the lower water collection chamber.The raw water inflow sire that connects the lower part of the filter basin and the raw water conduit is drained.This is an open type heavy car with a backwash drainage siphon pipe installed at the entrance. In the over pond, a wastewater siphon pipe with one end connected to the lower water collection chamber and the other end opened into the drain;
A water collection culvert that communicates with the lower water collection chamber and a wash water siphon pipe that opens into each adjacent water collection culvert, and the water collection culvert is connected to the lower water collection side and the overwater weir side that includes the wash water siphon pipe. This is an open type gravity filtration basin characterized by dividing the basin into two parts and arranging a partition plate whose height is lower than the filtration water level.

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings.

In FIGS. 1 and 2, an open-type overflow pond (1) has a partition wall (26) flattened and a plurality of 0[! Inside each filtration basin (1) there is a filter bed (2) supported by a water passage plate (6).
), and the drain top (7) is located above the m floor (2).
i3 is equipped. - At the top of the filter pond (1) is the raw water pipe (
There is a common raw water tank (9) in each of the filter basins (1) connected to the filter basins (1), and it communicates with each filter basin through a raw water inflow siphon pipe (10).

On the outer fence of the filtration basin (1), there is a common drain (13) for each filtration basin connected to a drainage pipe (14), and the inside of each filtration basin (1) is connected by a playground drainage siphon pipe (12). drainage room (1
1) and the drainage culvert (15). In addition, the lower water collection chamber (4) of each filtration basin is provided at the lower part of the water passage plate (3), and on the side separated from the drainage chamber (11) by the partition wall (24), the other end is connected to the drainage culvert (16 ) is connected to a waste water siphon pipe (15) which is open inside. In addition, the drainage culvert (13)
In C, a drainage layer (21) is provided near where the drainage pipe (14) is connected, and the backwash drainage siphon pipe (15) and the waste water siphon pipe (15) are sealed against water. On the other hand, the lower water collection room (4)
At the bottom of the other side, there is a hole (22) that connects to the water collection channel (5). (17)
A wash water siphon pipe (16) is arranged to communicate with the water collection conduit (5) of the adjacent filtration pond (1) separated by The drainage top 7 (7) is installed between the common filter water drain (19)
1 to maintain the water level in the water collection culvert (5) at a higher level 4 (
18), and the filtrate water increase (18)-, which is lower than the filtrate water 4 (18) and includes the lower water collection chamber (4) and the wash water siphon pipe (16), and #C the water collection tikT5) for 2 minutes. A partition plate (6) is provided. Note that a filtration water pipe (20) is connected to the tli water conduit (19).

In the filtration basin of the present invention, raw water *
(91K The inflowing raw water flows down into the filtration basin (1) by generating a vacuum in the inflow siphon (10). The raw water is filtered by v-1 while passing through one bed (2).

It enters the lower water collection chamber (4) through the water passage plate (5). The filtered water enters the water collection channel (5) through the hole (22), and the filtered water increases (18
) overflows to the common filtration water conduit (19
)from.

Water is distributed through a filtered water pipe (20).

When filtration continues for a long time in a certain filter basin.

Foreign matter in the raw water accumulates on the surface of bed 1 (2), making it difficult to continue filtration. Therefore, a water level gauge (not shown) I
C, the inside of the backwash drainage siphon pipe (12) is evacuated, and a siphon is formed inside the siphon pipe (12). Further, the inside of the wash water siphon pipe (16) installed in the water collection conduit (5) of the filter basin (1) is evacuated to form a 1c siphon inside the siphon pipe (16).

- Break the knife-on in the Yorozuya water inflow siphon pipe (10) to stop the inflow of raw water. The water in the drainage chamber (11) in the filtration basin (1) passes through the backwash drainage siphon pipe (12) and enters the drainage* (15), where it is once stored.

It overflows the drainage layer (21) and is discharged to the outside of the yarn through the drainage pipe 14). The water level in the filter basin (1) decreases.

When the water becomes below +111m water weir (18), washing water flows from the water collection culvert (5) to the hole (22) and the lower water collection chamber (4) 1 water passage plate (
3), flows back into the filter basin (1), expands the filter bed (2), removes and washes away foreign matter deposited on the surface of the filter bed (2),
The water is discharged from the drainage top (7) through the drainage chamber (11) to the outside of the system by the backwash-drainage system (12). Water collection culvert (
The water level in step 5) does not fluctuate because wash water is replenished through the wash water siphon pipe (16) from the adjacent filter basin (1) where filtration is continuing.

Also continuing filtration! 12 filtration basin (1), partition plate (6
), normal filtration can be performed without the influence of backwashing of the adjacent filter basin. If two adjacent filtration basins shift to reverse flow at the same time and there is a shortage of wash water, a device with an interlock function (not shown) IC will stop one filtration basin from shifting to the reverse flow process. It is better to let

The siphon in (12) is broken to stop discharging water, and the inside of the raw water inflow siphon pipe (10) is evacuated to form a siphon, and the raw water flows into the filtration basin (1).

However, since the water level in the filtration basin (1) is below the filtration weir (18), the backflow of wash water continues. When the water level in the filtration basin (1) becomes similar to that of the filtered water (18), the siphon action of the wash water siphon pipe (16) is broken.

Stop supplying cleaning water.

Next (waste water siphon'l) Make a vacuum inside the siphon tube (15), form a siphon inside the siphon tube (15), and am-
Excess hawking water is discharged from the lower water collection chamber (4) into the drain (16). After thoroughly discarding the water, use the discard siphon pipe (15
) and move on to the filtration process.

As described above, in the open type gravity filter of the present invention,
There is no need to provide a washing water replenishment facility for replenishing washing water, and water at the initial stage of filtration that may contain foreign matter can be automatically discarded with a relatively simple structure.

[Brief explanation of drawings]

FIG. 1 is a plan view of an open type gravity filter according to the present invention. Figure 2 is A-A of Figure 1! *Draw a longitudinal section. (1) - Filter basin, (21 - Filter bed, (5) - Water passage plate, (4) - Lower water collection chamber, (5) - Water collection culvert, (6)
- diaphragm, (7) - drain top. (8)... Raw water piping, (91, raw water culvert, (1) Ifon pipe where raw water flows in, (11) - drainage room, (12) -
Backwash drain knife-on pipe. (13)-Drainage culvert, (14)-Drain pipe, (15)-
Waste water knife on tube. (16)-washing water siphon tube, (17)-bulkhead,
(18) - Filtered water weir, (19) - Filtered water dye, (
20) - Transient pipe, (21) - Drainage layer. (22)--It is a hole. Patent applicant Unitika Co., Ltd.

Claims (1)

[Claims] (1) A number of filtration ponds are divided by partition walls and arranged in a row, and a common raw water culvert, drainage culvert, and permeable water culvert are provided for each filtration pond, and each of the filtration ponds is provided with a common raw water culvert, drainage culvert, and permeable water culvert. A filter bed is installed on the water passage plate that divides the lower water collection chamber. Along with providing a drainage top above the filter bed. Open-type gravity filtration equipped with a raw water inlet siphon pipe that communicates the lower part of the filtration basin and the raw water culvert, and a backwash drainage siphon pipe with one end opening at the lower part of the filtration basin drainage chamber and the other end opening into the culvert. In the pond, a waste water siphon pipe with one end connected to the lower water collection chamber and the other end opened into the drainage culvert, and washing water opened into the collection culvert communicating with the lower water collection type and each adjacent water collection culvert. A siphon pipe, and the water collection tank is divided into two parts: a lower water collection chamber side and a filtration water tank including the washing water siphon pipe, and the height is a filtration water bottle release type gravity filter pond.