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US 8,366,932 B1Granted
Micro-aeration of sulfide removal from biogas
AssigneeIowa State University Research Foundation, Inc.
InventorsShihwu Sung, Samir Kumar Khanal, Thanapong Duangmanee
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Abstract
A novel method for treating sulfide-containing wastewater is described which involves treating sulfide-laden biogas produced in a bioreactor in a sulfide oxidizing unit (SOU). Oxidation in the SOU is monitored by an oxidation reduction potential (ORP) probe which minimizes the input of air/oxygen to produce elemental sulfur without significant production of sulfate.
Claims15
A method of treating wastewater and/or biogas to remove hydrogen sulfide by selective oxidation to elemental sulfur, comprising:
- digesting wastewater or biogas influent suspected of containing sulfide to produce substantially hydrogen sulfide-free effluent and/or biogas;
- and
- thereafter selectively oxidizing in a sulfide oxidizing unit diffuser at an oxygen/sulfide ratio of about 0.5 the biogas to elemental sulfur to minimize So4=oxidation, and to reduce the hydrogen sulfide level in the wastewater or biogas to a level of <10 ppmV.
Dependencies are inferred from the claim text.