| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cleaning a hollow fiber membrane module, by which the hollow fiber membrane module can be regenerated without stopping the operation of the apparatus, the cleaning effect better than that of the conventional physical or chemical cleaning method is gotten, the module can be operated automatically by carrying out a cleaning step periodically and the filtration capacity of the hollow fiber membrane can always be kept in an excellent state and in which the treatment of waste chemicals is not necessary. SOLUTION: This method for cleaning the hollow fiber membrane module to be used for the filtering of an original liquid, namely a method for cleaning/ removing depositions accumulated on the surface of the hollow fiber membrane, comprises an oxidatively cleaning step to clean the hollow fiber membrane by using an oxidizer, a warm water circulating step to circulate warm water through the hollow fiber membrane after the oxidatively cleaning step and a backwashing step to perform one or more of gas-backwashing, liquid- backwashing, gas introduction and gas-bubbling on the hollow fiber membrane during or after the hot water circulating step.
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