To provide a cleaning method and a filter apparatus which can reduce lowering of the efficiency of filtering and the performance of the apparatus associated with deterioration of the membrane due to repeated cleaning with a chemical by decreasing the number of times of cleaning with a chemical.
The filter apparatus has a filter 10 containing a hollow fiber membrane 100 which turns into being hydrophilic or hydrophobic depending upon changes of the temperature and/or pH of water supplied and becomes hydrophilic when target raw water is supplied, and a backwashing water production machine 16 which generates raw water for backwashing changing the surface of the hollow fiber membrane 100 into being hydrophilic and supplies the raw water for backwashing to the filter 10 in backwashing the hollow fiber membrane by filtering the raw water so as to remove suspended matter 200 on the surface of the hollow fiber membrane.
SAKURAI MANABU
SHIGENIWA SHINOBU
MATSUSHIRO TAKESHI
MENJU TAKU
NAKAGAWA KOICHI
| JP2007061677A | 2007-03-15 | |||
| JPH11199631A | 1999-07-27 |
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu