| abstract |
Described is an environmentally sound method for using acid waste water with the simultaneous formation of a sorbant, the method being characterized in that acid waste water arising from clay production and containing, as the main components, Al<3+>, Fe<2+/3+>, Ca<2+> and Mg<2+> cations and inorganic anions is reacted with an alkaline water-glass solution and the precipitate thus formed is separated off from the aqueous phase and optionally purified and dried. The sorbant is of use in the bleaching of oils or in the removal of soaps, phospholipids and heavy metals from oils, particularly edible oils. |