Vapor Fogging Technology for Hydrogen Sulfide and Mercaptan Control
A Southwest wastewater treatment facility was experiencing vapor
hydrogen sulfide and mercaptan odors in the headspace of one of their
pump stations. USP Technologies (USP) provided a proprietary vapor fogging technology (VFT) which involves fogging a dilute mixture of hydrogen peroxide (H2O2) and sodium hydroxide
(NaOH) into the enclosed vapor space to oxidize H2S and mercaptan
related odors. The process consists of two chemical storage/feed
modules, a solution make-up tank, and a fogging apparatus. The
underlying principle is absorption of gaseous H2S into an alkaline water
solution, with concurrent oxidation of the absorbed H2S. The principles
of operation are the same as those used in packed (and mist) tower odor
scrubbers.
The fogging systems are designed to deliver the
appropriate amount of each chemical into the headspace to treat the
vapor H2S and mercaptan loading on a continuous basis. USP provides a full-service project delivery scope for all the VFT and H2O2
equipment components, program management, application services,
equipment maintenance and operations support. Other vapor fogging
technology applications include treatment plant headworks, pump station
wet wells, gravity sewers, and biosolids storage tanks.
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