Patent ID: 6306282
Filing Date: 2001-10-23
Classification: C02F

Abstract:
A sludge-free method of treating a waste liquid slurry containing dissolved metal(s), the method comprising the steps of:providing a waste treatment system including a solids filter and an ion exchanger;supplying the waste liquid slurry containing dissolved metal(s) to the solids filter to separate the slurry into a first, solids-free liquid filtrate portion containing the dissolved metal(s) and a second, concentrated solids-containing waste portion having a substantially reduced dissolved metal(s) concentration;passing the first, solid-free liquid filtrate portion through the ion exchanger to substantially remove the dissolved metal(s) and provide a substantially metal(s)-free liquid effluent therefrom;washing the second, concentrated solids-containing waste portion in said solids filter by passing therethrough a first portion of the substantially metal(s)-free liquid effluent from the ion exchanger, thereby further reducing the amount of dissolved metal(s) contained therein; anddischarging the washed, concentrated solids-containing waste portion into a waste drain, thereby providing a sludge-free treatment of the waste liquid slurry.