| 摘要 |
PURPOSE:To reduce the total organic carbon loads of primary and secondary pure water manufacturing apparatus by constituting a pretreatment apparatus with a chemical oxidation means and a biological treatment means included and reducing the total organic carbon concentration of water to be treated in the pretreatment apparatus. CONSTITUTION:Raw water in a raw water tank 1 is sent to an upward current type biological reactor (biological treatment tank) 2 by a pump 12A and, after being decomposed biologically, is sent to an oxygen dissolving tank 4. A pretreatment means is composed of the biological treatment tank 2 and the oxygen dissolving tank 4. The biological treatment tank 2 contains active carbon 3 as a carrier. In this composition, some components of the total organic carbon (TOC), which can easily be decomposed biologically like urea, are decomposed biologically in the tank 2. Next, the residual TOC components, during descent in the oxygen dissolving tank 4, are oxidation decomposed by ozone injected from a pipe 5. Water in the tank 4 is circulated to a biological treatment tank through a pipe 14. The treated water with reduced TOC concentration is sent to a pure water manufacturing apparatus through a pipe 14. |
