ASCENDING FLOW FILTER APPARATUS AND ASCENDING FLOW FILTER METHOD

摘要

PROBLEM TO BE SOLVED: To provide an ascending flow filter apparatus equipped with an emergency evacuation device reduced in pressure loss during filtering over a long time, enabling filtration much in SS trapping quantity and generating the overflow of an untreated liquid naturally when the trapping quantity of SS becomes excessive, and an ascending flow filter method.;SOLUTION: In the ascending flow filter apparatus wherein a filter tank 1 having a raw water inflow pipe 3 connected to the lower part thereof is packed with a sedimentary filter medium 2 and screens are provided above and below the filter medium packed bed, the screen above the filter medium packed bed is provided as a local screen 4 and water passed through the local screen is guided to a treated water discharge pipe 5.;COPYRIGHT: (C)2004,JPO