Treatment of spent caustic waste

摘要

Systems and methods are provided for the treatment of caustic wastewater. Specifically, systems and methods are provided for combining refinery spent caustic and ethylene spent caustic solutions and treating the combined spent caustic mixture using a wet air oxidation process.

主权项

1. A system for treating a waste stream comprising:
a source of a sulfidic spent caustic; a source of refinery spent caustic; a mixed caustic conduit having an inlet in communication with the source of sulfidic spent caustic and the source of refinery spent caustic; and a wet air oxidation unit comprising an inlet and an effluent outlet, the inlet of the wet air oxidation unit in communication with an outlet of the mixed caustic conduit; and a heat exchanger arranged to receive an oxidized effluent from the effluent outlet and a mixed caustic from the mixed caustic conduit, the heat exchanger effective to heat the mixed caustic with heat from the oxidized effluent.