JP2003320372A - Filter for water environment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a defect of a mesh screen type filter by discharging interposed foreign matters laminated on the surface of a filter screen together with backward washing water as a drainage to the outside by blowing the interposed foreign matters with spraying strongly-pressurized water on the water-introducing-side surface of the filter screen in the process of backward washing. <P>SOLUTION: A stable energy-saving filter system is realizes never realized before in such a way that the mesh screen type filter is set along the inner surface of a casing, that when a filter efficiency deteriorates due to the interposed foreign matters laminated according to the progress of filtering, the state of backward washing is made by a pressure sensor, and that, at the same time, the whole water-introducing-side surface by washing by high pressure water from a rotary high pressure pipe arranged with a high pressure nozzle parallel to the filter mesh screen of the mesh screen type filter which is placed at the center part of the casing of the mesh screen into which untreated water enters, whereby the interposed foreign matters stuck to the mesh screen surface is cleaned together with the backward washing water in a short time. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a process of utilizing water used in industrial water, sewage or general living, sewage and water. As an important work in the art, the work of removing contaminants other than water such as trash mixed in water is generally performed by passing water through a filter or the like. When purifying clean water, the cleanliness improves in proportion to the size of the filter mesh, but the amount of water passing through the filter is controlled by the miscellaneous matter accumulated in the filter, and the amount of water passing through and the miscellaneous matter The filter is required to always maintain a constant purifying power and a constant flow rate of water in order to have an effect on the amount of supplied water in an inversely proportional relationship with the mixed amount per unit. Therefore, various systems have been implemented based on the concept of backwashing the flowing water in order to clean the surface of the filter surface on the passing water inlet side. [0002] A method for efficiently purifying polluted water quality is an important issue in modern times when water pollution is rapidly progressing, and is a method for purifying water quantity per unit by a membrane. It is desirable to keep costs as low as possible. Although a system similar to the filter membrane cleaning technique according to the present invention exists, it is small and has not been widely adopted because of the structure of the apparatus and the material used. An object of the present invention is to provide a filter that can handle a small capacity to a large capacity and that can save labor. A filtering device generally used at present is roughly classified into a method of passing water through an opening of a mesh or a slit by sand filtration and a membrane or a slit. In the case of sand filtration, the filtration accuracy varies and a larger apparatus is required for a membrane type. In the future, it is desired that the filtering device has a small unit capacity of the device and can regulate the filtering accuracy. [0003] A membrane or slit type filtration device satisfies the ideal as a filter in the future, but is provided with a contaminant filtered and separated from the water on the membrane surface or slit surface on the water inlet side. Since the filter membrane surface or slit water inlet surface is blocked, it is necessary to keep the filter membrane surface clean at all times, so it is necessary to refresh the membrane surface by a backwashing method, but miscellaneous materials laminated on the membrane surface are backwashed It is not easy to separate from the membrane surface only by the counterflow due to. In the present invention, a high pressure pipe is installed on the water inlet side while maintaining the backwashing state, and a nozzle for rotating and moving the filter membrane surface on the water inlet side of the filtration membrane for cleaning is mounted in parallel on the high pressure pipe and water is supplied with clean water. The contaminants separated from the membrane surface together with the backwashing flow by washing the side filtration membrane surface are discharged to the outside of the filtration device from the drain drain port opened at the same time as the backwashing. [0004] A typical case of the present invention will be described with reference to FIG. 1 and FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a filtration device taken along a line AA 'and viewed from a lateral direction for explaining the structure and function of the filtration device according to claim 1. The filtration process of the present filtration device will be described. The water that needs to be filtered flows into the filter R from the pipe 1 opening at the bottom of the filter (hereinafter referred to as the device R) through the pump 17 at a constant pressure through the pump 17, whereby the filtration membrane 10 is removed.
The water filtered from the entire surface is deposited in the space 16 between the casing 12 and the filtration membrane 10 of the apparatus R, becomes clean water, and is discharged from the filtered water outlet 2. After a certain amount of filtration, foreign substances in the water are deposited and adhere to the inner surface of the filtration membrane, and the amount of purified water passing through the filtration membrane decreases, and the difference between the pressure on the water inlet side 1 and the pressure on the water outlet side 2 is used. Then, the control device 25 is operated to close the valves 20 and 22 and open the valves 21 and 23, and at the same time, the pump 17 is stopped.
The purified water sent from the purified water tank 24 with 8 turned on performs back washing of the filtration membrane through the space 16 in the casing 12 and simultaneously supplies high-pressure water from the purified water tank 24 to the high-pressure water pipe 5 by the high-pressure pump 19. The high-pressure water pipe 5 is rotated at the center of the apparatus R by the high-pressure water pipe 5 while rotating the high-pressure water pipe 5 to spray and wash miscellaneous substances adhering to the surface layer of the filtration membrane 10 being backwashed from the pressurized water discharge port 11 and reverse the falling miscellaneous substances. The water is discharged from the drain opening 4 opened by the valve 21 together with the washing water. An automatic system in which the washing time of the filtration membrane is controlled automatically by the time of the artificial judgment criterion and the operation control by the pressure change of the line pump 18 can be considered. When filtering the inflow water continuously, it is necessary to install a plurality of devices 12. The filtering device according to the present invention efficiently removes strongly adhered contaminants by operating water flows having different intensities on the filtering membrane surface by utilizing the flow velocity difference, and efficiently removes the foreign substances attached to the filtering membrane surface. The size of the entire system required per unit capacity can be reduced. Also, the mesh of the filtration membrane can be freely selected at a required level.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a representative example of a water environment filtering device according to claim 1 as indicated by a cross-section taken along a line AA ′ in FIG. 2; FIG. 2 is a cutaway view for explaining a state in which a casing central portion of the water environment filtration device according to claim 1 is cut along a horizontal plane. FIG. 3 is a system flow for explaining an operation procedure for operating the present water environment filtration device. [Explanation of Codes] 1. Water inlet before filtration 2. outlet of filtered water 3. High pressure water inlet for filtration membrane washing 4. Drain outlet that opens when washing the filtration membrane 5. High-pressure water pipe for filtration membrane washing rotated by power 8 6. Joint for rotating high-pressure water pipe 5 7. Mechanical seal for sliding part of joint 6 and high-pressure water pipe 5 Power for 5 rotations of high pressure water pipe 9. Spacer for fixing filtration membrane 10. Filtration membrane11. Pressurized water outlet 12. Tubular casing 13. 13. Bevel gear attached to high-pressure water pipe 5. 4. Bevel gears that drive the gears 13 attached to the motion 8. 15. bottom bearing of high-pressure water pipe 5 17. Space for filtered water Water pump to filtration device 18. Backwashing line pump 19. High pressure pump for filtration membrane washing 20. Inflow water valve 21. Drain valve 22. Clean water delivery valve 23. Backwater valve for backwashing 24. Purified water tank 25. Control device 26. Level control 27. Clean water delivery pipe

Claims (1)

Claims: 1. A pressurized water pipe having a structure in which an independently sealed cylindrical casing is installed vertically and rotatable independently from the casing from above the center, and a central axis of the casing is provided. At the same time, a pressurized water discharge port which is supported by a bearing at the center of the bottom of the casing and is opened at equal intervals in a line connecting one point or a plurality of places on the circumference of the pressurized water pipe is provided along the inner surface of the casing. At the same time, a filtration membrane is formed in a sealed state on the upper and lower bottom surfaces of the casing, and the inlet of the pretreatment water and the drain opening are attached to the bottom surface of the casing in the filtration membrane. . Further, a filtering device for water environment having a structure that is opened on the side surface of the filtration membrane and the casing.