Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1979-07-27
1981-05-19
Castel, Benoit
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210759, 210903, C02F 172
Patent
active
042683971
ABSTRACT:
A waste water-treating method, which comprises the steps of: adjusting the pH value of an aqueous solution containing a nitrous acid radical within a range of 2 to 5; treating said aqueous solution with hydrogen peroxide to oxidize the nitrous acid radical into a nitric acid radical; and throwing away the waste water in the neutralized form.
REFERENCES:
patent: 3826741 (1974-07-01), Nakamura
Horie Toshio
Mine Nobuyoshi
Tomioka Shouji
Castel Benoit
The Furukawa Electric Co. Ltd.
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