HIGH SPEED FILTRATION METHOD AND APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent rapid rising of filtration resistance and deterioration of quality of filtered water.

SOLUTION: The high speed filtration unit 28 is provided with a turbidity sensor 30 for detecting turbidity of raw water after precipitation treatment by a coagulation/precipitation treatment facility 10; a coagulant addition means 32 for adding a polymer coagulant to the raw water; a controller 34; and a granular filter medium layer 38 passing the raw water added with the polymer coagulant. The controller 34 controls an amount of polymer coagulant added by the coagulant addition means 32 according to the detection value of the turbidity sensor 30.

COPYRIGHT: (C)2004,JPO