	US 7,431,850 B2
	Process for purification treatment of wastewater containing organic substance
Genji Imai, Kanagawa (Japan); Naonori Miyata, Kanagawa (Japan); Takeshi Sako, Shizuoka (Japan); and Izumi Okajima, Shizuoka (Japan)
Assigned to Kansai Paint Co., Ltd., Amagasaki-shi (Japan)
Appl. No. 10/561,269 PCT Filed Jun. 18, 2004, PCT No. PCT/JP2004/008939 § 371(c)(1), (2), (4) Date Apr. 11, 2007, PCT Pub. No. WO2005/007578, PCT Pub. Date Jan. 27, 2005.
Claims priority of application No. 2003-174579 (JP), filed on Jun. 19, 2003; application No. 2003-174668 (JP), filed on Jun. 19, 2003; and application No. 2003-174669 (JP), filed on Jun. 19, 2003.
Prior Publication US 2007/0256972 A1, Nov. 08, 2007
Int. Cl. B01D 15/00 (2006.01)

U.S. Cl. 210—761

10 Claims

1. A process for purification treatment of wastewater containing an organic substance, which comprises subjecting the wastewater containing an organic substance to treatment complementary to supercritical treatment or subcritical treatment, and then purifying the wastewater by treatment including supercritical treatment or subcritical treatment, wherein the complementary treatment is at least one treatment selected from among the following treatments (a)-(c):

(a) at least one physical treatment selected from among separation treatment with a flocculant, sedimentation treatment, flotation treatment, and filtration treatment;

(b) electrolytic oxidation reduction treatment; and