Apparatus and method for two-stage oxidation of wastes

Patent · Sun Jan 01 00:00:00 EST 1995

OSTI ID:869878

Fleischman, Scott D ^[1]

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1. Aiken, SC

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.

• Research Organization: Savannah River Site (SRS), Aiken, SC (United States)
• DOE Contract Number: AC09-89SR18035
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5414199
• OSTI ID: 869878
• Country of Publication: United States
• Language: English

Related Subjects

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
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