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Title: Apparatus and method for two-stage oxidation of wastes

An apparatus and method for oxidizing wastes in a two-stage process. The apparatus includes an oxidation device, a gas-liquid contacting column and an electrocell. In the first stage of the process, wastes are heated in the presence of air to partially oxidize the wastes. The heated wastes produce an off-gas stream containing oxidizable materials. In the second stage, the off-gas stream is cooled and flowed through the contacting column, where the off-gas stream is contacted with an aqueous acid stream containing an oxidizing agent having at least two positive valence states. At least a portion of the oxidizable materials are transferred to the acid stream and destroyed by the oxidizing agent. During oxidation, the valence of the oxidizing agent is decreased from its higher state to its lower state. The acid stream is flowed to the electrocell, where an electric current is applied to the stream to restore the oxidizing agent to its higher valence state. The regenerated acid stream is recycled to the contacting column.
  1. (Aiken, SC)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) SRS
Patent Number(s):
US 5414199
Contract Number:
Research Org:
Country of Publication:
United States
apparatus; method; two-stage; oxidation; wastes; oxidizing; process; device; gas-liquid; contacting; column; electrocell; stage; heated; presence; air; partially; oxidize; produce; off-gas; stream; containing; oxidizable; materials; cooled; flowed; contacted; aqueous; acid; agent; positive; valence; portion; transferred; destroyed; decreased; electric; current; applied; restore; regenerated; recycled; aqueous acid; electric current; gas stream; stream containing; oxidizing agent; off-gas stream; two-stage process; contacting column; positive valence; partially oxidize; gas-liquid contacting; oxidizing agen; /588/204/205/