HIGH RATE FILTER AND HIGH RATE FILTRATION METHOD USING THE FILTER

摘要

A high rate filter relating to the field of raw water filtration technology and allowing a high rate filtration of a large amount of raw water including high density suspended solids (SS), wherein irregular or tubular floated filer media (2) formed with foam high polymers of 0.1 to 0.4 g/cm<3> in apparent density, 0.1 MPa or more in 50 % compressive hardness, and 4 to 10 mm in size are filled inside an upflow filtration tower (1), and the raw water including the high density SS is allowed to pass therethrough at a water passing line speed of 100 to 1000 m/day for filtration, whereby a high SS arresting rate can be obtained without allowing the floated filter media (2) to be compacted, and also a backwashing can be performed at a washing line speed of as high as 1.2 to 4.0 m/min.