| 摘要 |
PURPOSE:To restrain the clogging of the reverse osmosis membrane and to make equipment long in service life by providing two processes of a sand filtration one and a superfine filtration or ultrafiltration one, thereby facilitating the removal of impurities in raw water and enabling a reverse osmosis operation. CONSTITUTION:A water treating device for producing ultrapure water used in electronic industry and pharmaceutical industry, etc., has a sand filter 1 into which raw water added with a flocculant 10 as necessary is introduced under pressure by a booster pump 6, and impurities of over 1-100mum particle diameter are removed therein. After the raw water leaving the sand filter 1 is once stored in a storage tank 5, it is sent to a superfine filter 2 by a booster pump 6 and fine particles of over 0.01-10mum particle diameter and microorganisms such as algae are removed mainly therein. Next, after the raw water is once stored in a storage tank 5 similarly, it is fed to a reverse osmosis device 3 through a safety filter 7 and a high pressure pump 8 and dissolved salts and organic materials, etc., are separated therein. |
