Improved Filtration technique for the treatment of oxidised photographic processor effluents

摘要

A method of separation of a precipitate from a treated or untreated photographic processor effluent by the addition of an inert powder of high bulk prior to filtration or settling. The inert powder may be a diatomaceous earth, such a kieselguhr, or aluminium hydroxide or wet sawdust. The separation time and the pressure required to give rapid filtration is reduced. The rate at which the solid phase will settle is similarly improved.