| 摘要 |
PROBLEM TO BE SOLVED: To reduce residual materials originating from a coagulant, prevent abrupt increase in filtration head loss, and reduce the amount of generated sludge. SOLUTION: In this water cleaning method by rapid filtration, raw water is subjected to coagulant pouring, rapid agitation, slow agitation and rapid filtration to be cleaned. The G value of rapid agitation is set to >=300 S-1. As a result, a function of a coagulant can be performed effectively, which reduces residual materials originating from the coagulant, prevents the clogging of filtration media, and therefore prevents abrupt increase in filtration head loss, and which also reduces excess coagulant and the amount of generated sludge.
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