| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for washing membrane module capable of efficiently washing membrane separation equipment and unnecessitating treatment of washing waste liquid. SOLUTION: Acid and alkali are alternately injected into a membrane module 4 and, thereafter, the injected acid and alkali are respectively drawn out of a raw water chamber 4a. In accordance with water quality of raw water in the membrane separation equipment, alkali washing after acid washing or acid washing after alkali washing is properly selected, at the same time, respective concentrations of chemicals are adjusted to perform washing, thereby, the effective washing can be performed, a high washing effect can be obtained with chemicals of a dilute concentration and the membrane performance can be effectively restored. By using the acid and alkali by an equivalent quantity, waste water disposal of the washing waste liquid is made unnecessary and it is made possible to mix and neutralize acid washing waste liquid and alkali washing waste liquid and discharge the mixed and neutralized waste liquid without providing a separate waste water processing apparatus. Because the injected acid and alkali is drawn out from the raw water chamber side, the contamination of the permeate water chamber side can be prevented. COPYRIGHT: (C)2006,JPO&NCIPI
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