| 摘要 |
PROBLEM TO BE SOLVED: To hardly generate a halogenated organic material in water to be treated and to make the ability of trihalomethane generation in permeated water of a reverse osmosis membrane small by adding free chlorine just before the reverse osmosis membrane in a membrane separation process using the reverse osmosis membrane by using free chlorine as a sterilizing agent for the water to be treated. SOLUTION: Relating to a desalination equipment as an experimental plant of reverse osmosis, suspension particles are removed by adding a flocculant into the water to be treated sucked up by an intake pump 1 by a fixed delivery pump 2 and passing the water through a sand filtration bed 3. After that, the water to be treated reserved in a treating water tank 4 is send by a sending pump 5 and is adjusted in pH by adding sulfuric acid using a fixed delivery pump 6. And the water is passed through a cartridge filter 7, sterilized by adding chlorine by a fixed delivery pump 6, increased in the pressure by a pressure pump 9 and fed to the reverse osmosis membrane module 10. At this time, the ejecting point of free chlorine is suitably just before the high pressure pump 9 or just before the cartridge filter 7 and the contact time is preferably <180 sec.
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