JPS6268507A - Continuous filtering apparatus - Google Patents

Abstract

PURPOSE:To maintain a good filtering performance, by providing an ejector which forms a siphon at starting and an ejector which circulates filter medium and discharges contaminated water from a separation chamber by means of siphonage. CONSTITUTION:Two ejectors 9, 14 which are operated by pressurized raw water by means of a raw water pump 4 are provided. And, one ejector 14 forms siphon at starting, while the other ejector 9 withdraws contaminated filter medium in the bottom of filter layers 2a, sends it up to a separation chamber 11, and returns washed filter medium to the surface of the filter layers 2a to circulate said washed filter medium, on the other hand, contaminated water is discharged from the separation chamber 11 by means of siphonage. As a result, filtering capacity of the filter layers 2a is always maintained in accordance with a predetermined value without being lowered, leading to a good filtering performance. And further, as two ejectors 9, 14 are arranged to be operated by pressurized raw water, loss of washing water is decreased to improve overall filtering capacity.

Description

[Detailed Description of the Invention] [Field of Sedentary Use] This invention provides a method for filtering general industrial water, wastewater, etc. using an F material similar to sand across the sand [7. This invention relates to a continuous filtration device for purification.

[Conventional technology]

Conventionally, many filtration devices of this type have already been known. Filter media such as sand filled in the filtration tank of a filtration device becomes contaminated and clogged when used for a long time, reducing the filtration capacity. 〃), commonly known in water treatment plants, etc.
As disclosed in Japanese Patent Application Publication No. 51-79051 or Japanese Utility Model Publication No. 51-4016, the filtration tank is backwashed every predetermined filtration time.

The filtration capacity was restored by the method of removing the contaminants that were clogging the filtration layer - in the former method, all of the filtration material filled in the filtration tank was replaced. It requires a considerable amount of man-hours.

Depending on the frequency of replacement, certain equipment such as equipment for cleaning contaminated filter media may be required, making it impossible to perform the filtration process continuously.

Additionally, the latter method requires a cumbersome backwashing operation,
The filtration process had to be stopped intermittently, and filtered water had to be used multiple times to backwash the furnace.

For this reason, an improved filtration device (2),
A continuous filtration system as disclosed in Japanese Patent No. 41708 has been proposed, in which the raw water is filtered by flowing upward from below the filtration layer, and the contaminated filtration tl at the bottom of the filtration tank is removed from the filtration tank. An ejector operated with purified pressurized water causes the water to rise and flow into the separator placed above, and the filtration material that has been washed during the rise is separated and settled in the separator, and the polluted water is discharged and the settled washing water is The agent filter material is rewashed with purified water and then returned to the filtration tank for continuous filtration.

[Problem that the invention seeks to solve]

In the conventional continuous filtration device as described above, purified pressurized water is constantly supplied to the ejector to raise the contaminated filter material, resulting in refreshing purified water! i-Use 1. Since the cleaning process was carried out again after cleaning, there was a problem in that the amount of water that had been purified (purified) was increased, leading to a decrease in the purification ability.

[Failure to solve intervening vertices]

This invention was made in order to solve the problems of the conventional methods as described above, and allows continuous filtration to be performed without using a large amount of purified water.

The purpose is to maximize the capacity of the filtration tank.

The continuous filtration device according to the present invention has a purified water reservoir chamber with an inverted funnel-shaped opening at the top inside the sealed p-filtration device main body,
A funnel-shaped partition wall is cast downward, and the lower part thereof is used as a raw water inflow chamber.A raw water flow chamber is connected to this raw water inflow chamber.The funnel-shaped bottom of the partition wall serves as one contamination filtration inflow chamber, and a filtration tank is installed. A filter material separation chamber is provided, the lower end of which penetrates through the wooden upper sealing lid of the filtration tank and is located in the clean water reservoir chamber, and the contaminated filter material is passed through the riser pipe from the inflow chamber with contaminated filtration. A first ejector is provided which operates with pressurized raw water sent into the filter material separation chamber, and a polluted water tank is provided which discharges the polluted water separated in the filter material separation chamber by a siphon action via a downcomer pipe, and at the time of startup, In order to form a siphon in the polluted water downcomer pipe, a negative pressure pipe connected to the top of the polluted water downcomer pipe and a second ejector operated with pressurized raw water to generate negative pressure in the negative pressure pipe are provided. It is something that

[For production]

In the continuous filtration device according to the present invention, raw water flows into the raw water flow chamber L through the raw water inflow chamber at the bottom of the filtration tank, and the raw water is passed through the filtration layer through a large number of outflow holes provided in the @ wall and soil wall of this raw water flow chamber. The water flows out so as to flow evenly into the water, is filtered while rising over the entire surface of the filtration layer, overflows at the upper edge of the purified water reservoir chamber, and is led out through the purified water outlet pipe. - 10,000, the lower part of the filtration layer is filtered, and the first ejector operated with pressurized raw water removes the turbulence in the riser pipe from the J-contaminated filtration material inflow chamber through the riser pipe into the filter material separation chamber at the upper part of the filtration tank. It flows in while being stirred and washed by the current. In this separation chamber, it settles while being separated from the polluted water, and is rewashed by the purified water flowing into the Vc filtration material separation chamber, which is then deposited on the upper surface of the filtration tank in the filtration tank. Further, the polluted water flows into the polluted water tank through the dirt downcomer pipe due to the siphon action, and is discharged. When starting up this continuous filtration device, in order to form a siphon in the polluted water descending pipe, pressurized raw water is supplied to the second ejector to generate negative pressure in the pipe, and the water in the purified water reservoir chamber is sucked and the polluted water descends. Fill the pipe with water (-5 Complete the siphon with the difference in water head between the purified water reservoir water level and the polluted water tank water level.

[Embodiments of the invention]

FIG. 1 is a block diagram of a continuous F5P filtration device showing an embodiment of the present invention. In FIG.
is a filtration tank, 2at: is a filtration layer filled with E-filtration material such as sand up to the level shown by the dotted line in offshore filtration tank 2, 2b is a purified water reservoir formed in the upper part of an inverted funnel, and 2C is a purified water flow. 3 is a raw water inlet pipe, 4 is a raw water pump, a raw water inlet chamber is formed at the bottom of the 5-piece funnel-shaped partition wall, and an annular raw water flow chamber is formed by the upper wall 6a, the side wall 6b, and the bottom wall 6c. , the bottom wall 6CVc has a large number of inlets, and the top wall 6a and the side wall 6bvc have a large number of outflow holes in directions and positions such that the raw water evenly flows into the filtration layer 2R. 7 is a purified water outlet pipe, 8
8a is an inflow chamber with contamination filtration, 8a is an outflow pipe with contamination filtration, 9 is a first ejector, 9g4 is a high-pressure raw water supply pipe that is branched from the raw water introduction pipe 3 and operates the ejector 9, and 10 is a contamination filtered by the operation of the ejector 9. Rising pipe for raising the filter material, 11
A separation chamber for separating the cleaning agent filtering material and polluted water, a cylindrical wall of the separation chamber 11a, and a descending pipe 11b continuous from the rising pipe 10, the lower end of which opens into the cylindrical wall 11a. A polluted water downpipe, 13, connected from the upper small diameter part of the 12-piece separation chamber 11;
14f'i is a negative pressure pipe extending downward from the top of the polluted water downcomer pipe 12, and a second ejector 14f'i.

14aVi raw water introduction pipe 3 is branched and ejector 14
It is a polluted water tank with a high-pressure raw water supply pipe that supplies high-pressure raw water to the tank, and an overflow weir inside. In addition, +2a.

3 a, 8 b, 9 b2γ1'3 a,
14b is a check valve 6 Next, the operation of the continuous filtration device constructed as described above will be explained. First, for starting, stop valves 8 b, 9 b'r'3 a,
14 Bo was closed, the UK water pump 4 was started, and the stop valve 38 was slightly opened to pump raw water into the filtration tank 2, and the water level rose until it overflowed from the upper level of the purified water reservoir 2b. At this point, the stop valve 14b is opened and the high-pressure raw water is supplied from the full supply pipe 14a to the second ejector 14, and the stop valve 13a is fully opened (and negative pressure is generated in the negative pressure pipe 13 by the suction action of the ejector 14, The purified water in the purified water reservoir 2b is sucked up and flows into the first separation chamber 11 and further into the negative pressure pipe 13, and at the same time flows into the polluted water down pipe 12, displacing the air remaining in the first and second pipes 12 and 13. Eventually, purified water is filled, and a siphon is formed by the difference between the water level of the polluted water tank 15 and the water level of the purified water storage chamber 2b.Then, the polluted water downpipe 12
When the siphon is formed, the stop valve 13a.

The purified water (-) is caused to flow down to the polluted water tank 15 through the polluted water downpipe 12 by the siphon action, and is discharged to complete the siphon.

Next, open the stop valve 9b to check the high pressure raw water. After supplying water to the first ejector 9 through the supply pipe 9a and fully generating a rising water flow within the rising pipe 1°, the stop valve 8b is fully opened.

The contaminated filtration material at the bottom of the filtration layer 2a is transferred together with unfiltered raw water from the inflow chamber 8 with contaminated filtration to the ejector 9 via the outflow pipe 8a'.
The liquid is sucked in, ascends the rising pipe 10, and flows down into the separation chamber 11 from the descending pipe 11b. In the process of ascending through the rising pipe 10, the contaminated filter media are agitated by the turbulent flow of raw water rising together, and due to collisions between the filter media and the pipe wall,
The pollutants attached to the surface of the filtration material are peeled off and separated. In this state, when flowing down into the separation chamber 11, the filtration material settles under its own weight, and the filter layer 28 The filter material is deposited on the surface indicated by the dotted line, and by continuously repeating this washing, the filter medium circulates from above to below, and the performance of the filter layer 2a can always be maintained at a good level.

When preparations for starting this filtration process are completed, the stop valve 3a is opened to introduce the raw water from the inflow chamber 5 into the diversion chamber 6, and the upper wall 6
The purified water is made to flow uniformly upward into the filter layer 2a from the outlet holes in the side walls 6a and 6b, and is efficiently treated by the filter layer 28. The purified water is then led out through the purified water outlet pipe 7.

1-
The polluted water rises within the cylindrical wall 11a of the separation chamber 11, flows down the polluted water downcomer pipe 12 by siphon action, and is discharged from the polluted water tank 15. In this case, the polluted water downcomer 12
The amount of water sucked into Qz&.

If the opening of the stop valve 12 is adjusted so that the amount of water flowing in from the riser pipe 10 is slightly larger than Q1, the purified water will rise into the cylindrical wall 11a of the separation chamber protruding into the purified water reservoir chamber 11. Since the flow is generated, it is possible to prevent polluted water from entering the purified water reservoir chamber 2b, and to rewash the filter material that has settled.

〔Effect of the invention〕

As explained above, this invention is provided with two ejectors that operate with pressurized raw water by a raw water pump, one ejector performs siphon formation at the time of startup, and the other ejector sucks the contaminated filter material at the bottom of the filtration layer and raises it. The water flows into the separation chamber, and the washed filter medium is returned to the surface of the filtration layer. Good filtration performance can be obtained by always maintaining the desired design value without causing water leakage.Also, since the two ejectors are fed with pressurized raw water, purified water loss is reduced and overall efficiency is improved. Filtration ability can be further improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a continuous filtration device showing one embodiment of the present invention. 1: filtration device main body, 2: filtration tank, 2a: filtration layer. 2b: Purified water reservoir room, 3: Raw water introduction pipe, 5: Raw water inflow room,
6: Raw water flow chamber, 7: Clean water outlet pipe, 8: Inflow chamber with contamination filtration, 9.14: Ejector, 1o: Rising pipe, 11: Separation chamber, 12: Polluted water down pipe, 13: Negative pressure pipe, 15: Polluted water tank.

Claims (2)

[Claims] (1) Inside the sealed filtration device body, there is a purified water storage chamber with an inverted funnel-shaped opening at the top, a funnel-shaped partition is provided at the bottom, and the lower part is a raw water inflow chamber, and the raw water is connected to the raw water inflow chamber. A separation chamber is provided, a contaminated filter material inflow chamber is provided at the funnel-shaped bottom of the partition wall to form a filtration tank, and the filter material is separated by penetrating through the upper sealing lid of the filter tank body and having a lower end located in the purified water reservoir chamber. a first ejector operated with pressurized raw water for feeding contaminated filter media from the contaminated filter media inflow chamber through a riser pipe into the filter media separation chamber; A polluted water tank is provided to discharge water by siphon action via a polluted water downpipe, and at the time of startup,
In order to form a siphon in the polluted water downcomer pipe, a negative pressure pipe connected to the top of the polluted water downcomer pipe and a second ejector operated with pressurized raw water to generate negative pressure in the negative pressure pipe are provided. A continuous filtration device characterized by: (2) By setting the amount of water flowing down in the polluted water descending pipe due to the siphon action to be slightly larger than the amount of polluted water rising in the rising pipe together with the contaminated filter material, purified water gradually rises into the filter material separation chamber. 2. The continuous filtration device according to claim 1, wherein the continuous filtration device is adapted to generate a flow.