Patent ID: 8795625

Claim:
A process for removing hydrogen sulfide from a waste stream comprising: a first mixing step of mixing a sulfur dioxide stream with said waste stream to create a process stream, said process stream containing sulfur dioxide and hydrogen sulfide; a first reacting step of reacting said hydrogen sulfide with said sulfur dioxide in the presence of a catalyst; a first condensing step of condensing sulfur from said process stream; at least one subsequent mixing step of mixing at least one subsequent sulfur dioxide stream with said process stream; at least one subsequent reacting step of reacting said hydrogen sulfide with said sulfur dioxide in the presence of a catalyst; at least one subsequent condensing step of condensing sulfur from said process stream; an analyzing step of analyzing the amount of hydrogen sulfide and sulfur dioxide in said process stream; and a control step of adjusting flow of sulfur dioxide in at least one of said first mixing step and said at said at least one subsequent mixing step.