JP2008272735A - Filtration apparatus and regeneration method of tubular element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regeneration method of an element suited to treatment of sewage containing sand. <P>SOLUTION: The filtration apparatus 10 filtering sewage containing foreign matters comprises a tubular element 17 filtering sewage flowing to the inner periphery from the outer periphery, a cleaning water spray tube 21 disposed on the side of the tubular element 17 and spraying cleaning water onto the outer periphery of the tubular element 17 at a first stage of regeneration, a rotation mechanism 25 rotating the tubular element 17 at the first stage of regeneration, and a backwashing fluid supply pipe 37 supplying the backwashing fluid into the tubular element at a second stage of regeneration. Washing of the outer periphery of the tubular element can remove most of sediment including sand. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tubular element regeneration method and a filtration device for filtering sewage mixed with foreign matters.

When the sewage is treated with a filtration device, foreign matter gradually accumulates on the element. As this deposit increases, the flow resistance increases and the filtration capacity decreases.
Thus, when a certain amount of sewage is treated, the element is regenerated.

Conventionally, a backwashing method has been proposed as one of the methods for regenerating elements (see, for example, Patent Document 1).
JP 2001-108790 A (FIG. 2)

Patent document 1 is demonstrated based on the following figure.
FIG. 8 is a diagram for explaining the basic principle of the prior art. In FIG. 8A, sewage flows from the outer peripheral surface 101 of the element 100 toward the inner peripheral surface 102 in the element 100 composed of the ceramic filter. To be purified. Reference numeral 103 denotes foreign matter deposited on the outer peripheral surface 101.

  After filtering a certain amount, a water pressure P1 indicated by a white arrow pointing leftward is applied from the inner peripheral surface 102 to the outer peripheral surface 101 as shown in FIG. On the other hand, the water pressure P2 indicated by the white arrow pointing rightward is also applied from the outer peripheral surface 101 to the inner peripheral surface 102 so that P1 ≧ P2.

  After that, the water pressure P2 is sharply reduced to remove the foreign matter 103 attached to the outer peripheral surface 101 by the water pressure P1, and the element 100 is regenerated. This state is shown in (c).

When the main body of the foreign material 103 is mud, it is soft as a whole and there is no difficulty in removing the foreign material 103. However, when a large amount of sand or fine metal is mixed in the foreign matter 103, sand or the like is mixed into the mud like an aggregate and becomes hard as a whole, and the removal of the foreign matter 103 becomes difficult.
In particular, the difficulty increases as the thickness of the deposit increases. The above method is not suitable for sewage containing a large amount of sand or the like.
Therefore, there is a need for an element regeneration method suitable for treating sewage containing a large amount of sand and the like.

  An object of the present invention is to provide a method for regenerating an element suitable for treatment of sewage containing a large amount of foreign matter.

  The invention which concerns on Claim 1 is arrange | positioned at the side of a cylindrical element, the cleaning water injection pipe which injects cleaning water to the outer peripheral surface of a cylindrical element, the rotating mechanism which rotates a cylindrical element, and a cylindrical element And a backwash fluid supply pipe for supplying backwash fluid to the inside.

  The invention according to claim 2 is characterized in that the cylindrical element is composed of a plurality of cylindrical elements, and these cylindrical elements are arranged around the purified water injection pipe.

  The invention which concerns on Claim 3 is equipped with the activated carbon filter which filters further the purified water filtered with the cylindrical element, It is characterized by the above-mentioned.

  The invention which concerns on Claim 4 supplies a high voltage | pressure backwash fluid to the inside of a purified water cleaning process which cleans an outer peripheral surface by injecting high-pressure purified water on the outer peripheral surface of a cylindrical element, and this inside. It is characterized by comprising a fluid cleaning step of cleaning the tubular element by flowing backwash fluid from the inner peripheral surface of the cylindrical element to the outer peripheral surface.

  The invention according to claim 5 is characterized in that the backwash fluid is high-pressure air.

  In the invention which concerns on Claim 1, the cleaning water injection pipe which injects cleaning water to the outer peripheral surface of a cylindrical element, and the backwashing fluid supply pipe which supplies a backwashing fluid to the inside of a cylindrical element were installed. By cleaning the outer peripheral surface of the cylindrical element in the first stage and removing most of the deposits, the fine deposits biting into the filter in the second stage can be cleaned by backwashing, and high-precision regeneration can be achieved. There is an advantage that it is possible. As a result, it becomes possible to treat sewage containing a lot of sand and the like.

  In the invention which concerns on Claim 2, since the several cylindrical element is arrange | positioned around the purified water injection pipe, there exists an advantage that a several purified cylindrical element can be wash | cleaned with one purified water injection pipe, and it is efficient. .

  In the invention which concerns on Claim 3, the filtered water is further filtered with an activated carbon filter. Fine sand or the like that could not be filtered by the cylindrical element can be reliably filtered. The accuracy of filtration increases.

  In the invention which concerns on Claim 4, the cleaning water injection pipe which injects cleaning water to the outer peripheral surface of a cylindrical element, and the backwashing fluid supply pipe which supplies a backwashing fluid to the inside of a cylindrical element were installed. By cleaning the outer peripheral surface of the cylindrical element in the first stage and removing most of the deposits, the fine deposits biting into the filter in the second stage can be cleaned by backwashing, and high-precision regeneration can be achieved. There is an advantage that it is possible. As a result, it becomes possible to treat sewage containing a lot of sand and the like.

  In the invention according to claim 5, the backwash fluid is high-pressure air. Since most of the deposits are washed in the first stage of cleaning, the remaining deposits can be removed sufficiently even by backwashing with high-pressure air, and the element is regenerated with less purified water. There is an advantage that you can.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is an overall view of a filtration device according to the present invention. A filtration device 10 is superposed on a main container 11 having an open top surface, an intermediate plate 12 disposed on the upper portion of the main container 11, and an upper portion of the intermediate plate 12. A plurality of cylinders that are rotatably supported on the intermediate plate 12 via bearings 16 in the vertical direction, and a lid 14 that is stacked on top of the cylinder 13 and serves as a lid for the cylinder 13. The element 17, the cleaning water injection pipe 21 disposed in the middle of the cylindrical element 17, the sprocket 24 installed on the outer peripheral surface of the purified water outlet 22 at the upper part of the cylindrical element 17, and the cylindrical type provided to contact the sprocket 24 A rotation mechanism 25 for rotating the element (details will be described later), a sewage introduction pipe 27 for introducing sewage provided on the lower side surface of the main container 11, a sewage discharge pipe 28 for discharging sewage, and a bottom face Reqi The attached matter delivery pipe 29 for delivering the attached matter and the like of the cylindrical element 17 peeled off by the water, the water purification tank 32 connected to the cleaning water injection pipe 21 via the cleaning water introduction pipe 31, and the cylindrical body 13 A purified water delivery pipe 36 having an activated carbon filter 34 provided outside for further filtering the filtered water and a flow meter 35 for measuring the flow rate of the filtrate water, and a cylindrical element 17 provided on the opposite side of the purified water delivery pipe 36. And a backwash fluid supply pipe 37 for supplying high-pressure air for backwashing.

  2 is a cross-sectional view taken along line 2-2 of FIG. 1. The rotating mechanism 25 includes a rotating shaft 38 provided in the front and back surfaces of the drawing, a rotating shaft sprocket 39 provided at the tip of the rotating shaft 38, and a rotating shaft. The shaft 41 includes a shaft 41 and a chain 41 provided so as to be in contact with the sprocket 24.

Returning to FIG. 1, a motor 43 for driving the rotation mechanism 25 is provided on the top of the lid body 14.
The upper surface of the main container 11, the intermediate plate 12 and the lower surface of the cylindrical body 13 are connected by a long bolt 45, and the cylindrical body 13 and the lid body 14 are connected by a short bolt 46.
47, 48, 49, 51, 52 and 53 are valves for opening and closing the pipe, 54 is a sealing material, and an O-ring is preferable.

The operation of the filtration apparatus having the above configuration will be described next.
FIG. 3 is a diagram for explaining a normal filtration operation, and black arrows indicate the flow of water.
The sewage introduced into the main container 11 from the sewage introduction pipe 27 flows from the outer peripheral surface of the cylindrical element 17 toward the inner peripheral surface and is filtered by the cylindrical element 17.
The filtered purified water flows from the purified water outlet 22 to the cylinder 13, passes through the purified water delivery pipe 36, and is further filtered by the activated carbon filter 34.

  The water filtered by the cylindrical element 17 is further filtered by an activated carbon filter. Fine sand or the like that could not be filtered by the cylindrical element 17 can be reliably filtered. The accuracy of filtration increases.

  Thereby, the purified water purified in two stages by the tubular element 17 and the activated carbon filter 34 can be obtained continuously. However, when the purification operation is advanced, foreign matters such as sand contained in the sewage are accumulated on the outer peripheral surface of the cylindrical element 17, and the filtration capacity is reduced. Therefore, the reproduction operation described below is performed as appropriate.

FIG. 4 is a diagram for explaining the first stage of the regeneration work. In the first stage of regeneration, first, the sewage introduction valve 47 is closed to stop the introduction of sewage into the main container 11. Next, the sewage discharge valve 49 is opened.
Thus, the sewage collected in the main container 11 can be discharged to the outside as indicated by the white arrow at the lower right of the drawing.

  When the sewage is discharged, the sewage discharge valve 49 is closed, and the motor 43 is operated to rotate the cylindrical element 17 as indicated by the arrow. At the same time, the cleaning water introduction valve 51 is opened. Then, the cleaning water can be sent from the clean water tank 32 to the cleaning water jet pipe 21 as indicated by the black arrow. As indicated by an imaginary line, the cleaning water is jetted from the cleaning water jet pipe 21 toward the outer peripheral surface of the cylindrical element 17 to clean the deposits on the cylindrical element 17.

With this cleaning water, most of the foreign matter accumulated on the outer peripheral surface of the cylindrical element 17 can be removed. In particular, sediments that are hardened by mixing sand and fine metals in mud can be effectively removed by the water pressure of the cleaning water.
Since the cylindrical element 17 is rotated at a constant speed by the motor 43, the cleaning water indicated by an imaginary line hits the entire circumference of the cylindrical element 17 evenly, and no cleaning leakage occurs. That is, a plurality of (for example, six) cylindrical filters 17 can be collectively cleaned with one cleaning water jet pipe 21.

  After cleaning with the cleaning water jet pipe 21 for a certain period of time, the cleaning water introduction valve 51 is closed and the cleaning with purified water is finished.

  FIG. 5 is a diagram for explaining the second stage of the regeneration operation. In the second stage of regeneration, first, the cleaning water introduction valve 51 is closed. Next, the backwash fluid introduction valve 52 is opened, and high pressure air is sent from the backwash fluid supply pipe 37 to the cylinder 13 as indicated by the black arrow. The high-pressure air sent into the cylinder 13 passes through the water purification outlet 22 and flows from the inner peripheral surface of the cylindrical element 17 toward the outer peripheral surface.

In the high pressure air, as shown by the white arrow, the foreign matter adhering to the outer peripheral surface of the cylindrical element 17 is blown outward. Since air has a lower density than water, the cleaning performance is low.
However, in the present invention, since most of the deposits are cleaned in the first stage of the regeneration operation, the amount of remaining deposits is small and the layer thickness is small. Therefore, in the second stage, cleaning with high-pressure air is possible.

The cleaning in the second stage may be performed with cleaning water, but the amount of cleaning water to be used can be reduced when high-pressure air is used as in the present invention.
After backwashing with high-pressure air for a certain time, the backwashing fluid introduction valve 52 is closed and the backwashing with high-pressure air is completed.

  Next, the deposit delivery valve 53 is opened. As a result, the foreign matter accumulated in the bottom of the main container 11 and the cleaning water used in the first stage are sent out from the deposit delivery pipe 29 as shown by the white arrow at the bottom of the drawing, and the cleaning of the tubular element 17 is completed.

FIG. 6 is a flow chart of the method for using the filtration device according to the present invention, and the processing flow rate Q1 is set in step (hereinafter referred to as ST) 01.
The sewage is introduced into the sewage tank, and the sewage is filtered through the cylindrical element (ST02).
Accumulated flow Q2 is measured (ST03). Specifically, the flow rate of the filtered water is measured by the flow meter 35 shown in FIG.
It is checked whether or not the cumulative flow rate Q2 has reached the processing flow rate Q1 (ST04). If it is less than Q1, filtration of sewage (ST02) is continued, and if Q1 is reached, filtration is stopped (ST05). Specifically, the sewage introduction valve 47 shown in FIG. 1 is closed.

The sewage in the sewage tank is discharged from the sewage discharge port (ST06).
The cylindrical element is rotated (ST07), and clean water is sprayed onto the outer peripheral surface of the cylindrical element while being rotated to wash the cylindrical element (ST08).

The cylindrical element is back-washed with high-pressure air (ST09).
The deposits accumulated at the bottom of the sewage tank and the purified water sprayed in ST08 are discharged to the outside of the sewage tank (ST10).

Next, a workpiece cleaning apparatus provided with such a filtration apparatus will be described.
FIG. 7 is a principle diagram of a workpiece cleaning apparatus provided with a filtration device according to the present invention. The workpiece cleaning apparatus 60 includes a net-like workpiece mounting plate 62 on which a workpiece 61 to be cleaned is mounted, and a workpiece 61. A sewage tank 63 for receiving sewage generated when washing is disposed.

  A three-way valve 55 was connected to the flow meter 35, one of the three-way valves 55 was connected to the water purification tank 32, and the other was connected to the workpiece cleaning device 60.

  The purified water filtered by the filtering device 10 flows into the purified water tank 32 until a predetermined amount is accumulated, as indicated by an arrow (1). When a predetermined amount of purified water is stored in the purified water tank 32, the three-way valve 55 is switched. When the three-way valve 55 is switched, the purified water is sent to the workpiece cleaning device 60 as shown by the arrow (2).

  The workpiece 61 is washed as indicated by the arrow (4) by the purified water sent to the workpiece washing device 60 and the purified water introduced from the workpiece washing water introduction pipe 64 indicated by the arrow (3). By washing the work 61, sand or the like adhering to the work 61 is dropped together with water into the sewage tank 63 as indicated by an arrow (5).

  The sewage collected in the sewage tank 63 is introduced into the filtration device 10 through the sewage introduction pipe 27 as indicated by an arrow (6). The introduced sewage is filtered in the filtration device 10, and (1) to (6) are repeated.

  Since the filtered purified water is used for cleaning the work 61, it is not necessary to discard the sewage, which contributes to environmental conservation. The amount of purified water introduced from the workpiece washing water introduction pipe 64 can be reduced. In addition, the purified water obtained by filtration is caused to flow into a purified water tank, and the tubular element is regenerated by this purified water. The amount of purified water introduced from the outside can be reduced, and the running cost of using the filtration device can be suppressed.

  The filtration device of the present invention is suitable for regenerating water mixed with foreign matters.

1 is an overall view of a filtration device according to the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a figure explaining normal filtration work. It is a figure explaining the 1st step of reproduction work. It is a figure explaining the 2nd stage of reproduction | regeneration work. It is a usage method flowchart of the filtration apparatus which concerns on this invention. It is a principle figure of the workpiece | work washing apparatus provided with the filtration apparatus which concerns on this invention. It is a figure explaining the basic principle of the prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Filtration apparatus, 11 ... Main container, 12 ... Intermediate | middle board, 13 ... Cylindrical body, 14 ... Cover body, 17 ... Cylindrical element, 21 ... Clean water injection pipe, 25 ... Rotation mechanism, 37 ... Backwash fluid supply pipe, 52 ... Backwash fluid introduction valve, 60 ... Work washing machine.

Claims (5)

  In the filtration device that filters sewage mixed with foreign matter, the filtration device is disposed on the side of the cylindrical element that filters the sewage flowing from the outer peripheral surface to the inner peripheral surface, and the cylindrical type A cleaning water injection pipe for injecting cleaning water onto the outer peripheral surface of the element, a rotating mechanism for rotating the cylindrical element, and a backwash fluid supply pipe for supplying backwash fluid to the inside of the cylindrical element are provided. A filtering device characterized by that.   The filtration device according to claim 1, wherein the cylindrical element is constituted by a plurality of cylindrical elements, and the plurality of cylindrical elements are arranged around the purified water injection pipe.   The filtration device according to claim 1 or 2, further comprising an activated carbon filter for further filtering the purified water filtered by the cylindrical element. A method for regenerating a cylindrical element that filters sewage flowing from an outer peripheral surface to an inner peripheral surface,
A water purification process for cleaning the outer peripheral surface by injecting high-pressure purified water onto the outer peripheral surface of the tubular element;
A fluid cleaning step of cleaning the cylindrical element by supplying a high-pressure backwashing fluid to the inside of the cylindrical element and flowing the backwashing fluid from the inner peripheral surface to the outer peripheral surface of the cylindrical element;
A method for regenerating a cylindrical element, comprising:   The method for regenerating a tubular element according to claim 4, wherein the backwash fluid is high-pressure air.

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