Mercaptan oxidation in aqueous waste Fig. 1. Mercaptan
destruction rate. Tert butyl mercaptan (TBM) and dimethyl
sulfide (DMS) are oxidized to destruction in an aqueous-waste
solution containing methanol (MeOH), monoethylene glycol (MEG),
ammonia and hydrocarbon sources using advanced oxidation process
(ozone, hydrogen peroxide and uV). The aqueous solution in the
trial mimics the expected waste stream from a gas-transport
pipeline. Background to the problem. PSE Kinsale Energy required
a process to dispose of an aqueous waste stream in a gas-storage
project. Injection gas constitutes odorized natural gas
containing 4.7 ppmv and 1.3 ppmv of TBM and DMS respectively.
This is injected into an offshore reservoir during summer for
winter withdrawal. Withdrawn gas is expected to be water
saturated, and hydrate inhibitors, MEG and MeOH, are injected.
The aqueous waste generated from the onshore separator contains
MEG/MeOH, TBM/DMS and trace amounts of native petroleum species
(alkanes, cyclics, phenol, etc.). Initi