Patent ID: 9017559
Filing Date: 2015-04-28
Classification: B01D,C02F

Abstract:
1. A method for cleaning a filter layer of a water treatment apparatus comprising a raw water supply tube, one or a plurality of mixed raw water stream jet nozzles each communicating at one end thereof with the raw water supply tube and having at the other end thereof a raw water outlet from which mixed stream of raw water and air is jetted out, a filtering tank housing a filter layer disposed below the mixed raw water stream jet nozzle or nozzles with a predetermined distance between a surface of the filter layer and the raw water outlet of the mixed raw water stream jet nozzle or nozzles, a filtered water takeout tube provided in the filtering tank for taking out water filtered through the filter layer, a reverse stream cleaning water supply tube provided in the filtering tank for supplying reverse stream cleaning water to the filter layer, a filter material vibrating means for vibrating a filter material of the filter layer, said filter material vibrating means having a portion which is buried in the filter layer, and an overflow outlet provided in the filtering tank above the filter layer, wherein said filter material vibrating means comprises one or a plurality of vibrating elements connected to a power source, and vibration expanding means connected to said vibrating element or elements in such a manner that said vibration expanding means is buried in the filter material for transmitting vibration of the vibrating element or elements to the filter material of the filter layer; said vibration expanding means comprises a frame connected to the vibrating element and a plurality of vibration expanding elements fixed to the frame, and wherein each of said vibration expanding elements comprises a support bar which extends vertically in the filter layer and is fixed at the upper end thereof to the frame, a plurality of first vibration transmitting plates which are fixed to the support bar in such a manner that the first vibration transmitting plates are disposed in parallel to one another with a predetermined interval in the vertical direction of the filter layer, and a plurality of second vibration transmitting plates which are fixed to the support bar in the interval of the first vibration transmitting plates in such a manner that the second vibration transmitting plates cross the first vibration transmitting plates and are disposed in parallel to one another; and further wherein the filter layer is cleaned by vibrating the filter material of the filter layer while causing the reverse stream cleaning water to flow from the reverse stream cleaning water supply tube and causing vibration of said vibrating element to be transmitted by said vibration expanding elements.