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With the rapid development of modern industry, the discharge of various waste water is increasing year by year, and most of them have the characteristics of high concentration of organic matter, poor biodegradability and even biological toxicity.
Comprehensive treatment of such high-concentration refractory organic waste water is given at home and abroad.
Attaches great importance to and formulated more stringent standards
.
At present, some wastewater with simple ingredients, slightly better biodegradability, and low concentration can be treated by combining traditional processes, while wastewater with high concentration and difficult to biodegrade is difficult to be thoroughly treated, and it is also economically very difficult.
Wet Air Oxidation (WAO) is to oxidize dissolved or suspended organic matter and reduced state in water with an oxidant (air or oxygen) under high temperature (120～374℃), high pressure (0.
5～20MPa) and liquid phase conditions.
An advanced oxidation technology for inorganic substances
.
Compared with conventional methods, it has the characteristics of wide application range, high treatment efficiency, few secondary pollution, fast oxidation rate, recoverable energy and useful materials, etc.
The wet oxidation process was first researched and proposed by FJ Zimmermann in the United States in 1958.
It was used to treat papermaking black liquor, and the COD removal rate of wastewater after treatment could reach more than 90%
.
Before the 1970s, the wet oxidation process was mainly used for the disposal of municipal sludge, the recovery of lye in the black liquor of papermaking, and the regeneration of activated carbon
