JPH0592109A - Method for filtering liquid containing suspended particles - Google Patents

Abstract

PURPOSE: To improve sedimentation and filtering processes. CONSTITUTION: The processes after improvement the described below. In the filtering process, a valve 30 is closed, a valve 32 is opened, sludge 24 is made to flow in the order of a pump 27 → a filter 10 → a pipe line 18 → a tank 7 for 15 minutes, and thereafter, the valve 30 is opened and the valve 32 is closed to proceed to the filtering process. In the cleaning and water washing processes, the valve 31 is opened and a liq. in the tank 19 is fed to the tank 7 until the liq. level reaches a low level sensor 14 in the tank 19. Next, the valve 31 is closed and a filter 10 is continuously cleaned, while making a cleaning liq. to flow in the order of 1→5→12→11→4→3→42→19 until the liq. reaches a sensor 15. The sludge in a cleaning water flows into a second tank 29 through a hole at at the lower part of an intermediate partition 40 of a settling tank 9. Next, the route is continuously washed by water in the order of 1→4→11→12→5→3→42→19 to continue the water cleaning process until the liq. reaches a sensor 19. The above processes are repeated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to improvements in systems for filtering liquids containing suspended particles.

[0002]

The system described in Spanish Patent No. 8,900,619 operates as follows. Filtration process: Contaminated liquid (24) pressurized by pump (27)
The first pass (1), the fourth pass (4), the filter (1
0), the upper pass (11), the lower pass (12) of the filter (10), the fifth pass (5), the second pass (2), and the cleaning treatment liquid pipe (13). Filter washing step: It is necessary to stop the operation of the filter (10) and regenerate the filter. Therefore, the liquid is pumped by the pump (27) in the first pass (1), the fifth pass (5), the lower pass (12) of the filter (10), and the upper pass (1) of the filter (10).
1), 4th pass (4), 3rd pass (3) and the settling tank (9) It is equipped with a valve assembly (6) for circulating in this order, and the liquid is made to flow. Filter Washing Step: After the filter washing step, the filter element (26) is not in standard condition and remains unwashed with particles. In order to operate the filter (10) again, the filter is subjected to a water washing step, and the liquid is passed through the first pass (1), the fourth pass (4), the upper pass (11) of the filter (10), the filter (1).
The lower bath (12), the fifth pass (5), the third pass (3), and the settling tank (9) of (0) are flowed in this order. The used liquid returns to the polluted liquid tank (7) through the return pipe (23), and the cleaning liquid is directly sent to the target for use, or a part of the cleaning liquid flows through the pipe (17) through the cleaning liquid tank (8). And sent to the target.

[0003]

Problems to be Solved by the Invention Spanish Patent Nos. 8 and 9
Regarding the filtration system disclosed in U.S. Pat. No. 00,619, the following problems exist, but it has been found that some components can be improved in order to solve these problems. (1) Individual liquids having different degrees of pollution and pollution flow into the sedimentation tank at different times, resulting in a waste of time and energy for mixing them. (2) When the operation of the filtration system is started after each stop, a water hammer effect occurs in the filter (10) and stirs unnecessary mud in the cleaning liquid pipe (13). These problems were solved by the method shown below.

[0004]

The present invention will be described in detail with reference to the following embodiments, but the present invention is not limited thereto.

To improve the original system described above, FIG.
In, the partition tank (40) is used to divide the sedimentation tank (9) into a first tank (19) and a second tank (29). The bulkhead (40) may be movable to adjust the volumes of the first tank (19) and the second tank (29) as needed, and the first tank (19) and the second tank (29). )
A connecting means (41), which is a series of openings arranged inside, is provided at the bottom of the partition. The contaminants from the washing and washing steps are returned to the first tank (19) using the washing / washing pipe (42). Since the liquid discharged from the washing step is very polluted, suspended pollutants are likely to settle, and the pollutants are opened by the driving force of the water flow between the first tank (19) and the second tank (29). It flows mainly through the part (41) to the second tank (29).

Next, when the washing process is applied, a relatively clean liquid is washed from the washing / washing pipe (42) into the first tank (1).
A small amount of pollutants that flow into 9) and settle are carried into the second tank (29). That is, the liquid that is relatively sharply accumulated in the first tank (19) and precipitates with the dirty liquid, and the pollutants (44) that can be removed by the usual method are used in the second tank (2).
9) Collect inside. A first tank (19) with a relatively clean liquid that can be used in the washing and sedimentation process is connected by a valve (31) with a relatively dirty pollutant tank (7).

A liquid level sensor, that is, a low level sensor (14), an intermediate sensor (15) and a high level sensor (16) are provided in the first tank (19). It is within the scope of the present invention to equip a further tank with a similar sensor.

When the apparatus is in operation and the pump (27) is in operation and is in the filtration process, the pressure in the filter (10) rises rapidly, damaging the processing liquid pipe (13) through which only filtered or clean liquid flows. Or it may be blocked with pollutant particles. In order to solve this problem, cleaning treatment liquid piping (1
A branch (18) leading from 3) to the pollutant tank (7) is provided.

The system may be manually operated, but is preferably equipped with conventional automatic control means which function as follows. Filtration Step: (First Step) The contaminated liquid (24) is filtered according to the description of the above patent, but first, the valve (3) of the cleaning treatment liquid pipe (13) is used.
0) is closed and the valve (32) of the branch (18) is opened to allow liquid to flow to the contaminated liquid tank (7). This first step is continued for 15 seconds, for example. (Second step) Then, the valve (32) is closed and the valve (3
0) and open the system as described in the above patent. Washing and washing steps: Open the valve (31) and connect the first tank (19) and the pollutant tank (7) until the liquid in the first tank (19) of the sedimentation tank (9) reaches the low level sensor (14). To do. The valve (31) is closed and the flushing operation of the system is carried out according to the description of the above patent until the liquid level in the first tank (19) reaches the level of the intermediate sensor (15). Next, the water washing process is performed until the liquid level of the first tank (19) reaches the level of the upper sensor (16). This cycle is then repeated.

The first tank (19) and the second tank (29)
The opening (41) in between can be adjusted.

[Brief description of drawings]

FIG. 1 is a diagram of an improved system for treating a liquid containing suspended particles.

[Explanation of symbols]

 1, 2, 3, 4, 5 ... Pass 6 ... Valve assembly 7 ... Contamination tank 9 ... Sedimentation tank 10 ... Filter 11 ... Upper path of filter 12 ... Lower path of filter 13 ... Cleaning solution piping 14, 15, 16 ... Level sensor 18 ... Branch 19 ... First tank 20 ... Pressure gauge 24 ... Contaminated liquid 26 ... Filter element 27 ... Pump 29 ... Second tank 30, 31, 32, 33 ... Valve 40 ... Partition wall 41 ... Connecting means 42 ... Washing / Washing pipe 44 ... Pollutant

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[Procedure amendment]

[Submission date] October 1, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The first tank (19) and the second tank (29)
The opening (41) in between can be adjusted.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Added

[Correction content]

[Brief description of drawings]

FIG. 1 is a diagram of an improved system for treating a liquid containing suspended particles.

[Explanation of Codes] 1, 2, 3, 4, 5 ... Pass 6 ... Valve Assembly 7 ... Contamination Tank 9 ... Sedimentation Tank 10 ... Filter 11 ... Filter Upper Pass 12 ... Filter Lower Pass 13 ... Cleaning Treatment Liquid Pipings 14, 15, 16 ... Level sensor 18 ... Branch 19 ... First tank 20 ... Pressure gauge 24 ... Contaminated liquid 26 ... Filter element 27 ... Pump 29 ... Second tank 30, 31, 32, 33 ... Valve 40 ... Partition wall 41 ... Connecting means 42 ... washing / washing piping 44 ... contaminants

Claims (4)

[Claims] 1. A settling tank (9) comprising a first tank (19)
And the second tank (29) are divided and connected by the connecting means (41), and the first tank (19) is connected to the washing / water washing pipe (4).
2. A method for filtering a liquid containing suspended particles, which comprises passing through 2) and further connecting the first tank to a pollutant liquid tank (7). 2. A first tank (19) and a second tank (2)
The liquid containing suspended particles according to claim 1, characterized in that said connecting means (41) with 9) consists of a series of holes provided at the bottom of a partition (40) separating both tanks. Method. 3. A branch (1) for passing a cleaning liquid tank (7) through a cleaning liquid pipe (13) on the outlet side of the valve assembly (6).
8) is provided, The method of filtering the liquid containing the suspended particles according to claim 1 or 2. 4. A level sensor (14), (15),
A set of (16) is provided at least in the first tank (19) and these signals and the signal of the pressure gauge (20) indicating the pressure in the filter (10) are sent to the valve assembly (6).
It is used as an input signal to control the components (6), (30), (31), (32), (33) and (27) by automating the system to adjust the liquid flow rate. A method for filtering a liquid containing the suspended particles according to claim 1.