Patent ID: 6383377
Filing Date: 2002-05-07
Classification: B01D,Y10T

Abstract:
A filtering apparatus comprising:a filtering vessel, wherein a precoat filtering layer is formed with a filter aid on a filtering bed between a nonfiltered liquid chamber having a nonfiltered liquid inlet port, through which a nonfiltered liquid to be filtered is introduced, and a filtered liquid chamber having a filtered liquid outlet port, so that the nonfiltered liquid introduced through said nonfiltered liquid inlet port into the nonfiltered liquid chamber is filtered while moved through said precoat filtering layer to said filtered liquid chamber to be let out of said filtered liquid chamber through the filtered liquid outlet port; a nonfiltered liquid introduction line, including a pump and a first open/close valve connected to a suction port of said pump, for introducing the nonfiltered liquid to be filtered into said nonfiltered liquid chamber through said nonfiltered liquid inlet port; a filtered liquid outlet line, including a second open/close valve, for letting out the filtered liquid through the filtered liquid outlet port of said filtered liquid chamber; a filter aid introducing line that can be opened and closed, including a filter aid addition part, from a prearranged precoating liquid outlet port of said filtering vessel, to a portion between the pump suction port and the first open/close valve of said nonfiltered liquid introduction line; a bypass line for precoating, from a portion between said filtered liquid outlet port and the second open/close valve of said filtered liquid outlet line, to a portion between the pump suction port and the first open/close valve of said nonfiltered liquid introduction line, via a third open/close valve; and a bypass line for valve cleaning, from a liquid inlet section of the second open/close valve of said filtered liquid outlet line, to a portion between the pump suction port and the first open/close valve of said nonfiltered liquid introduction line, via a fourth open/close valve.