Mazzei High Efficiency Injector Model 4091 Solves Sour Water Problem
A tunnel construction project encountered sour (hydrogen sulfide containing) water intrusion. Hydrogen Sulfide (H2S) concentrations as high as 200 ppm were encountered at some locations. State regulatory agencies require complete removal of the H2S before the treated water can be released into the environment.
THE SYSTEM:
The sour water is pumped from the excavation through up to four MAZZEI Model 4091 Injectors in parallel. The air and water mixture is discharged into a baffled tank. In some of the applications part of the water is recirculated through the injectors again. With sufficient retention time, (13-15 minutes), the Hydrogen Sulfide concentration is reduced to less than 5 ppm with one pass through the injectors. The remaining traces of H2S are removed by chemical treatment.
Mazzei Injector CorporationROCESS:
Two mechanisms, stripping and oxidation achieve reduction of H2S. The stripping mechanism is accomplished by a large amount of induced air volatilizing the H2S. The oxidation mechanism is accomplished by the oxygen in the induced air reacting with H2S to form elemental sulfur. The following reaction applies:
2HS - + O2 ---> 2S0 + 2HO -
Based on the relationship between retention time and H2S removal it is apparent that oxidation is the primary mechanism-taking place in these applications.
CONCLUSIONS:
MAZZEI Injectors afford a simple,practical, reliable and cost effective means for Hydrogen Sulfide removal from water. The final product resulting from this system of H2S removal is environmentally benign sulfur.
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