US 4,927,543 A · Method and installation for treating liquid by sedimentation using fine sand

Abstract

Method of treating liquid by sedimentation in which reagents are injected into a flow of untreated liquid and there is created in the flow a colloid mixing and stabilization area; the flow is passed into an intermediate aggregation area and then into a sedimentation area equipped with separator plates from which clarified liquid is taken; characterized in that insoluble granular material which is more dense than the liquid is injected into the liquid in predetermined proportions in the mixing area where the flow is made turbulent, turbulence is induced in the intermediate aggregation area to maintain the granular material in suspension, virtually all of the granular material is brought into the sedimentation area, the sludge recovered in the sedimentation area is removed, the granular material is removed therefrom (D) and is recycled after cleaning.

Claims20

Dependent claims

A method for liquid treatment by sedimentation comprising the steps of:

injecting reagents into a flow of untreated liquid and creating in said flow a colloid mixing and destabilization area where said flow is made turbulent and where insoluble granular material denser than said liquid is injected into said liquid in predetermined proportions;
passing said liquid flow with said insoluble granular material into an intermediate colloid aggregation area where turbulence is induced to maintain said insoluble granular material in suspension,
passing said turbulent liquid flow together with subsequentially all of said granular material into a sedimentation area equipped with separator plates and removing clarified liquid from said separator plates;
and
removing from the sedimentation area sludge formed therein including said insoluble granular material, recovering said insoluble granular material from said sludge, and cleaning and recycling said granular material.

2 more elements

Installation for liquid treatment by sedimentation comprising:

a colloid mixing and destabilizing chamber provided with an inlet for untreated liquid, a reagent inlet, an inlet for introducing granular material insoluble in and denser than said liquid, a first turbulent flow inducing agitator device means, and a liquid outlet;
an intermediate aggregation chamber connected to said outlet of said colloid mixing and destabilizing chamber and provided with a second turbulent flow inducing agitation device means for maintaining said granular material in suspension and a liquid outlet;
a sedimentation chamber connected to said outlet out said intermediate aggregation chamber for receiving turbulent flow therefrom, said sedimentation chamber including separator plates and provided in an upper part thereof with an outlet for clarified liquid located above said separator plates and in a lower part with a sludge recovering area below the separator plates having an outlet for sludge;
and
a sludge/granular material separator station connected to said outlet for sludge and to said inlet for granular material.

2 more elements

Dependencies are inferred from the claim text.

Method and installation for treating liquid by sedimentation using fine sand

Life of this patent

Method and installation for treating liquid by sedimentation using fine sand

Life of this patent

Abstract

Claims20