| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drainage pretreatment device utilizing foam separation for effectively removing an organic system SS in drainage treatment using a microbubble, and a method. <P>SOLUTION: The drainage pretreatment method includes: a process S1 which treats the microbubble of drainage in a conditioning tank by generating the microbubble containing gas and having a diameter of 10 to 50 μm by using a first microbubble generator in the drainage not lower than COD 1,000 mg/L containing an organic system fine solid substance; a process S3 which generates a foam in the drainage by generating the microbubble by using a second microbubble generator while supplying air to the drainage which is treated in a foam forming tank in the preceding process; and a process S5 which separates drainage containing the foam to a foam phase and a liquid phase in a foam separation tank, and rakes out a foam phase. The organic system microsolid substance is made to adhere on the surface of the microbubble which is generated by the second microbubble generator in the foam forming tank, the microbubble is floated, and the foam is formed, thus treating the foam. <P>COPYRIGHT: (C)2012,JPO&INPIT |
