Photoassisted oxidation of species in solution
AssigneeCRC for Waste Management and Pollution Control Limited
InventorsGing Hauw Khoe, Maree Therese Emett, Robert G. Robins
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Abstract
The invention relates to methods and processes for the photoassisted oxidation of dissolved species such as arsenic, iron, phosphorous and sulphur. Each aspect of the invention involves supplying to a solution including the species to be oxidized, an oxidant and a photoabsorber, and then irradiating the resultant solution with UV/electromagnetic radiation. The resulting oxidised species can then be subsequently treated, used and/or removed (e.g. through precipation/co-precipitation).
Claims21
A method for the oxidation of As(III) in solution comprising the steps of:
- (a) supplying to the solution oxygen, and a photoabsorber which is capable of increasing the rate of As(III) oxidation when exposed to UV radiation;
- and
- (b) irradiating the resultant solution from (a) with UV radiation.
A method for the oxidation of phosphorus(III) in solution comprising the steps of:
- (a) supplying to the solution oxygen, and a photoabsorber that increases the rate of said oxidation when exposed to UV radiation;
- and
- (b) irradiating the resulting solution from (a) with UV radiation.
A process for removal of As(III) from solution comprising the steps of:
- (a) supplying to the solution an oxidant, and a photoabsorber that both increases the rate of As(III) oxidation when exposed to electromagnetic radiation and precipitates/co-precipitates with subsequently oxidized As(III);
- (b) irradiating the resulting solution from (a) with electromagnetic radiation;
- and
- (c) allowing precipitation/co precipitation of the subsequently oxidized As(III) and the photoabsorber, if necessary, by adjusting the pH of the solution from (b) to cause said precipitation/co-precipitation.
A method for oxidising Fe(II) to Fe(III) in a solution having acid pH comprising the steps of:
- (a) supplying to the solution an oxidant, and As(III) or P(III);
- and
- (b) irradiating the resulting solution from (a) with UV radiation.
Dependencies are inferred from the claim text.