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Hydrogen Sulfide Removal by Electrochemical Process

Technology #20160286

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H2SH2S Manure
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Researchers
Bo Hu, PhD
Associate Professor, Bioproducts and Biosystems Engineering
External Link (bbe.umn.edu)
Hongjian Lin, PhD
Post-Doctoral Associate, Bioproducts and Biosystems Engineering
External Link (bbe.umn.edu)
Managed By
Larry Micek
Technology Licensing Officer 612-624-9568
Patent Protection

Provisional Patent Application Filed
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Non-confidential Summary [PDF]

Remove H2S from Water and Gas

An effective and economical electrochemical oxidation process for aqueous and gaseous sulfide removal can remove hydrogen sulfide (H2S) directly from aqueous environments. The technology uses an electrode system where anodic oxidation directly or indirectly oxidizes sulfide or scavenges sulfide by anodically generated ferrous. By removing H2S directly from both liquid (aqueous) and gas phases, its efficiency and possible applications are increased. The system is very efficient in H2S removal and doesn’t interfere with desirable biological processes such as biogas production. Its simple electrode system is easy to install, operate, control and monitor, and doesn’t add chemicals to the media or require additional pretreatment or post-treatment.

Hog Farm Application

Hydrogen sulfide present in human and animal waste has strong odors, is corrosive and can be lethal and explosive in high concentrations. It causes problems for industrial hog farms due to EPA and state regulations and when H2S concentrations spike, can be life-threatening to farmers and livestock. This new technology has several advantages over current hydrogen sulfide removal technologies used in aqueous systems. For example, most conventional methods work only in the gas phase, while this technology works in aqueous media as well. Existing technologies that do work in aqueous media require intensive chemical and energy inputs, while this process only requires modest electrical energy input. Furthermore, this technology doesn’t require concentrating hydrogen sulfide from the gas phase into an electrolyte and it eliminates using ion-exchange membranes between anodes and cathodes. It does not require forming anodic biofilm and the electrode materials are much less expensive than electrode materials currently used.

BENEFITS AND FEATURES:

  • Continuous H2S removal from aqueous systems including animal and human waste
  • Simultaneously removes H2S directly from both liquid (aqueous) and gas phases
  • No pre-treatment or post-treatment modifications required
  • Highly efficient
  • Simple electrode system
  • Doesn’t interfere with desirable biological processes
  • Convenient installation, operation, control and monitoring

APPLICATIONS:

  • Swine farms
  • Deep-pit and shallow-pit swine manure storage
  • Sewer systems
  • Residential septic systems
  • Municipal wastewater plants
  • Swine, beef and milk producers handling large quantities of manure
  • Paper wastewater treatment facilities
  • Sugar beet manufacturers
  • Confined spaces where sulfide species are present and generated in nearby aqueous environments (tunnels, wells, agricultural silos, etc.)
  • Gas processing plants
  • Anaerobic digesters
  • Odor control
  • Vent gas treatment
  • Gas storage
  • Landfill gas
  • Petrochemical plants
  • Oil refining plants

Phase of Development - Proof of concept