| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for clarifying a filter membrane module with a chemical without detaching the filter membrane module from an apparatus and capable of treating a clarifying waste liquid generated when chemical clarification is carried out safely, sanitarily and at a low cost to a water quality level allowing the liquid to discharge to a public water area of water in a purification plant site at which a membrane filter apparatus is installed. SOLUTION: In a chemical clarifying process of the filter membrane module, a primary process is carried out using an admixture solution of sodium hydroxide and sodium hypochlorite as a clarifying chemical liquid, and a secondary process is carried out using a reducing acid solution such as a sodium hydrogen sulfite solution, a sodium sulfite solution, a sodium thiosulfate solution or the like as the clarifying chemical liquid. COPYRIGHT: (C)2005,JPO&NCIPI
|
