Purification of waste streams containing available chlorine

Details Purification of waste streams containing available chlorine Purification of waste streams containing available chlorine

1978-07-21

1979-11-20

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

C02B 136

Patent

active

041750381

ABSTRACT:
A process is disclosed for reducing the available chlorine content of aqueous waste streams produced in chemical plants, especially calcium hypochlorite plants, in order to permit further purification treatment in waste purification systems which employ activated carbon. The available chlorine content is reduced by chlorinating the impure stream at a temperature in the range from about 80.degree. to 100.degree. C. at a pH in the range from about 5.5 to about 8.5. In order to avoid excessive reactor boilover, close control of these conditions is required. In addition the reaction is time dependent and the holdup time in the reactor and a subsequent hold tank ranges from about 0.5 to about 4 hours. During this reaction the available chlorine forms the corresponding chlorate in the aqueous solution which may be passed through the activated carbon bed without adversely affecting the bed operation.

REFERENCES:
patent: 1197640 (1916-09-01), Kriegsheim
patent: 1609759 (1926-12-01), McMahon
patent: 2452970 (1948-11-01), Vincent et al.
Jacobson, Encyclopedia of Chemical Reactions, vol. 2 (1948), p. 138.
White, Handbook of Chlorination, Van Nostrand Reinhold Co., New York (1972), pp. 377-382.

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