US 2024/0199457 A1 · OXIDATION OF SULPHUR SPECIES

Abstract

A method for oxidation of sulphur oxyanions contained in a stream of aqueous liquid. An aqueous liquid stream containing sulphur oxyanions is mixed, in a sparger device, with at least one oxidant in gaseous form, thereby obtaining, mixed within the aqueous liquid stream, oxidant microbubbles containing reactive radicals species in contact with dissolved or condensed oxidant and the aqueous liquid stream, and/or reactive radicals species in contact with the at least one oxidant in gaseous form and the aqueous liquid stream. The dissolved or condensed oxidant and the reactive radicals species, and/or the at least one oxidant in gaseous form and the reactive radicals species, are allowed to contact sulphur oxyanions contained in the aqueous liquid stream and to oxidize sulphur oxyanions contained in the aqueous liquid stream to sulphate and/or to other sulphur oxidation states, by an oxidative reaction of the sulphur oxyanions with the reactive radicals species, thereby forming sulphate and/or other sulphur oxidation states containing aqueous liquid stream.

Claims17

Dependent claims

A method for oxidation of sulphur oxyanions contained in a stream of aqueous liquid, wherein in the method

an aqueous liquid stream containing sulphur oxyanions is mixed, in at least one sparger device, with at least one oxidant in gaseous form and/or active gas, thereby obtaining, mixed within the aqueous liquid stream, oxidant microbubbles containing reactive radicals species in contact with dissolved or condensed oxidant and the aqueous liquid stream, and/or reactive radicals species in contact with the at least one oxidant in gaseous form and the aqueous liquid stream,
the dissolved or condensed oxidant and the reactive radicals species, and/or the at least one oxidant in gaseous form and the reactive radicals species, are allowed to contact sulphur oxyanions contained in the aqueous liquid stream and to oxidize sulphur oxyanions contained in the aqueous liquid stream to sulphate and/or to other sulphur oxidation states, by an oxidative reaction of the sulphur oxyanions with the reactive radicals species, thereby forming sulphate and/or other sulphur oxidation states containing aqueous liquid stream,
wherein the oxidant is
one or more of hydrogen peroxide, oxygen, ozone, and air;
a mixture of N2 and at least one of hydrogen peroxide, oxygen, and ozone, or
a mixture of air and at least one of hydrogen peroxide, oxygen, and ozone;
and wherein the active gas is sodium hypochlorite, or peracid.

4 more elements

An apparatus for oxidation of sulphur oxyanions contained in a stream of aqueous liquid, the apparatus comprising

a sparger device configured to, in acidic, neutral or alkaline conditions,
mix an aqueous liquid stream containing sulphur oxyanions, with at least one oxidant in gaseous form,
obtain, mixed within the aqueous liquid stream, oxidant microbubbles containing reactive radicals species in contact with dissolved or condensed oxidant and the aqueous liquid stream, and/or reactive radicals species in contact with the at least one oxidant in gaseous form and the aqueous liquid stream, and
allow the dissolved or condensed oxidant and the reactive radicals species, and/or the at least one oxidant in gaseous form and the reactive radicals species, to contact sulphur oxyanions contained in the aqueous liquid stream and to oxidize sulphur oxyanions contained in the aqueous liquid stream to sulphate and/or to other sulphur oxidation states, by an oxidative reaction of the sulphur oxyanions with the reactive radicals species, to form sulphate and/or other sulphur oxidation states containing aqueous liquid stream, wherein the apparatus comprises a respective storage vessel located in fluid connection after each sparger device, wherein the storage vessel comprises a discharge pipeline for discharging sulphate and/or other sulphur oxidation states containing effluent in liquid form from the storage vessel, or for feeding the effluent in liquid form from the storage vessel to a next oxidation segment.

1 more element

Dependencies are inferred from the claim text.

Oxidation of sulphur species

Life of this patent

Oxidation of sulphur species

Life of this patent

Abstract

Claims17