Hydrogen sulfide removal process

A process to treat a hydrogen sulfide containing stream comprising:

• a) providing a feed stream comprising hydrogen sulfide to an absorber vessel containing a fixed bed of solid media;
• b) providing an amount of aqueous liquid treatment solution comprising a sulfur dye catalyst to the absorber such that the aqueous liquid treatment solution mixes with the feed stream within the fixed bed of solid media;
• c) controlling the residence time of the aqueous liquid treatment solution and feed stream within the absorber by adjusting a first control valve to change the amount of liquid treatment solution entering the absorber such that the hydrogen sulfide is absorbed into the aqueous liquid treatment solution and converted into sulfide ions that are then absorbed onto the sulfur dye catalyst causing the sulfur dye catalyst to solubilize;
• d) removing a spent treatment solution from the absorber vessel, where the spent treatment solution contains the sulfide ions, water, spent sulfur dye catalyst, and dissolved gas;
• e) introducing the spent treatment solution into an oxidation vessel;
• and
• f) controlling an amount of an oxygen containing gas introduced into the oxidation vessel that contacts the spent treatment solution by adjusting a second control valve that regulates the flow of the oxygen containing gas entering the oxidation vessel, where the second control valve is adjusted based on a measured oxidation reduction potential of fluids inside the oxidizer, inside the absorber or in an aqueous liquid stream of regenerated liquid treatment solution removed from the oxidizer, where the aqueous liquid stream of regenerated liquid treatment comprises thiosulfate, water, and regenerated sulfur dye catalyst causing the sulfide ions to oxidize to thiosulfate and to convert the spent sulfur dye catalyst to regenerated sulfur dye catalyst.