Cryogenic technology for the removal of h2s in wastewater treatment facilities

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Courtesy of IWA Publishing

Hydrogen sulfide (H2S; CAS No. 7783-06-4) gas production usually is one of the primary concerns in the wastewater treatment facilities.  Under anaerobic (septic) wastewater conditions, sulfides cannot be oxidized (Palmer, Lagasse, and Maureen 2011). Therefore, they combine with hydrogen to produce hydrogen sulfide gas, creating the 'rotten egg' odor associated with septic wastewater (Palmer, Lagasse, and Maureen 2011).   According to World Health Organization (2003), H2S is metabolized through three pathways: oxidation, methylation, and reactions with metalloproteins or disulfide-containing proteins. The toxicity of hydrogen sulfide is a result of its reaction with metalloenzymes (WHO 2003). Nervous and cardiac tissues, which have the highest oxygen demand, are especially sensitive to the disruption of oxidative metabolism. In the central nervous system, this effect may result in death from respiratory arrest (WHO 2003).  The lowest observed-adverse-effect level (LOAEL) is 2.8 mg/m3 in asthmatic individuals for respiratory and neurological effects (WHO 2003).

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