Treatment of hydrogen sulfide gas under aerobic conditions
First Claim
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1. A method for treating an aerobic contaminated gas stream, comprising:
- performing a first plurality of activities in a common vessel, the first plurality of activities comprising;
contacting the aerobic contaminated gas stream with a clean aqueous solution comprising approximately 0.5% Ferric MGDA to approximately 100% Ferric MGDA, the aerobic contaminated gas stream comprising air and comprising hydrogen sulfide at a concentration in the air of approximately 5 ppm or higher;
forming bonds between sulfide formed from the hydrogen sulfide and the iron in the Ferric MGDA to create;
an aerobic clean gas stream having a hydrogen sulfide concentration of 3.5 ppm or less; and
a dirty aqueous solution comprising sulfide saturated ferro MGDA;
mixing the dirty aqueous solution with an oxidant; and
via a reaction with the oxidant, breaking the bonds between the sulfide and the Ferric MGDA to form elemental sulfur mixed with a re-activated solution comprising re-activated Ferric MGDA;
separating the elemental sulfur from the re-activated solution to form a substantially hydrogen-sulfide-free solution; and
re-cycling the substantially sulfide-free solution to serve as the clean aqueous solution.
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Abstract
Certain exemplary embodiments can provide a system, machine, device, manufacture, and/or composition of matter adapted for and/or resulting from, and/or a method for, activities that can comprise and/or relate to contacting an aerobic contaminated gas stream with a solution comprising approximately Ferric MGDA, the aerobic contaminated gas stream comprising hydrogen sulfide.
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Citations
18 Claims
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1. A method for treating an aerobic contaminated gas stream, comprising:
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performing a first plurality of activities in a common vessel, the first plurality of activities comprising; contacting the aerobic contaminated gas stream with a clean aqueous solution comprising approximately 0.5% Ferric MGDA to approximately 100% Ferric MGDA, the aerobic contaminated gas stream comprising air and comprising hydrogen sulfide at a concentration in the air of approximately 5 ppm or higher; forming bonds between sulfide formed from the hydrogen sulfide and the iron in the Ferric MGDA to create; an aerobic clean gas stream having a hydrogen sulfide concentration of 3.5 ppm or less; and a dirty aqueous solution comprising sulfide saturated ferro MGDA; mixing the dirty aqueous solution with an oxidant; and via a reaction with the oxidant, breaking the bonds between the sulfide and the Ferric MGDA to form elemental sulfur mixed with a re-activated solution comprising re-activated Ferric MGDA; separating the elemental sulfur from the re-activated solution to form a substantially hydrogen-sulfide-free solution; and re-cycling the substantially sulfide-free solution to serve as the clean aqueous solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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in a substantially aerobic treatment zone of a single vessel, reacting reactants comprising a ferro MGDA and an aerobic contaminated gas stream, the aerobic contaminated gas stream comprising air mixed with hydrogen sulfide, the hydrogen sulfide present at a concentration of at least 5 ppm, wherein; reaction products of the reacting comprise; a spent ferro MGDA that comprises iron saturated with sulfide; and a clean gas stream having a concentration of hydrogen sulfide of no greater than 3.5 ppm; a content of the treatment zone is actively maintained at a pH of between approximately 5.9 and approximately 10; and in the single vessel, via a reaction with an oxidant, separating the sulfide and the iron. - View Dependent Claims (17, 18)
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Specification