Method for removing suspended solids from aqueous fluids

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

Reexamination Certificate

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Details

C175S066000, C210S712000, C210S738000, C210S772000, C210S802000, C210S804000

Reexamination Certificate

active

07972518

ABSTRACT:
A method for cleaning solids-laden aqueous fluids uses an apparatus comprising a settling tank having a sloping floor, which drops off into a collection area; primary and secondary mixing tanks, the lower regions of which are in fluid communication via fluid transfer means; and agitators in each of the mixing tanks. Solids-laden fluid is introduced into the primary mixing tank along with selected coagulant and/or flocculent chemicals, whereupon the agitator in the primary mixing tank is actuated to induce downward fluid flow toward the fluid transfer means and into the secondary mixing tank. The agitator in the secondary mixing tank is actuated to induce upward fluid flow in the secondary mixing tank, from which the fluid mixture overflows into the setting tank. Solids settle or precipitate into the settling tank, and then move downward along the settling tank's sloped floor and into the collection area, from which the solids can be removed for further treatment or disposal. Clean water is collected from the upper region of the settling tank, preferably via a spillway along the perimeter of the settling tank.

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