BATH WATER CLEANING SYSTEM

摘要

PROBLEM TO BE SOLVED: To increase the frequency of membrane washing as necessary, reduce turbidity of bath water and suppress physical deterioration of a hollow fiber membrane due to the membrane washing. SOLUTION: In this bath water cleaning system, a bath time zone and a non-bath time zone are provided and the non-bath time zone is divided into a first time zone just after the bath time until a lapse of a specified time and a second time zone after that. The system has two washing modes; a set washing mode for washing the membrane at preliminarily set intervals so as to increase the frequency of the membrane washing at the first time zone than the frequency of membrane washing at the second time zone, and a detection washing mode for performing the membrane washing in the non-bath time zone when a value for showing clogging of the hollow fiber membrane 4 is beyond a specified value at the time when clogging of pores of the hollow fiber membrane 4 is detected by a sensor.