PURPOSE: To easily separate and remove a nonionic surfactant along with the contaminant in a waste cleaning soln. generated when a material is cleaned by a cleaner contg. the surfactant by heating the waste soln. above the cloud point of the surfactant.
CONSTITUTION: A material is cleaned with a cleaner composition consisting of a nonionic surfactant alone or a mixture of the nonionic surfactant and ionic surfactant. When the waste cleaning soln. is discharged into the river or sewerage, the nonionic surfactant is previously separated and removed along with the contaminant. In this case, the waste soln. is heated above the cloud point of the surfactant, and a porous body, especially an org. porous material consisting of the polysaccharide fibrous material contg. a cellulosic fibrous material, is mixed into the waste soln. to effectively separate and remove the materials. The porous body after having adsorbed the contaminant is incinerated.
| WO/2010/094841 | METHOD FOR REMOVING ARSENIC AS SCORODITE |
| WO/2010/011136 | Method and system for supercritical removal of an inorganic compound |
TOKORO YASUKO
TAKAGI MASAHITO
TAWARA HIDEYUKI
