| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drainage treatment apparatus which can surely perform the magnetic separation of activated sludge even when treating drainage containing a relatively high concentration of foaming ingredients. <P>SOLUTION: In the drainage treatment apparatus for treating the drainage containing the foaming ingredients, a dissolved air flotation separator 11 for mixing pressure air-dissolved water with drainage (raw water) to separate and remove the foaming ingredients from the raw water by fine bubbles generated from the pressure air-dissolved water is arranged at a drainage (raw water) inflow part, and a biological reaction tank 12 for performing water treatment with activated sludge to which magnetic powder has been added, a magnetic separation means 14 for magnetically separating the activated sludge contained in activated sludge slurry flowing out from the biological reaction tank 12 from the slurry, and a passage for returning the activated sludge separated by the magnetic separation means 14 to the biological reaction tank 12 are installed on the downstream side of the dissolved air flotation separator 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
