Effluent treatment
AssigneeImperial Chemical Industries PLC
InventorsStephen J. Bryan, Martyn V. Twigg
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Abstract
A process for treating effluent wherein an oxidizing agent in the effluent is decomposed on contact with a catalyst bed. The oxidizing agent can be a pollutant present in the effluent, for example hypochlorite in the effluent from chlorine-producing brine electrolysis cells or from the scrubbing of chlorine gas. In an alternative the effluent may contain oxidizable pollutants and the oxidizing agent is purposefully added thereto. Passage over the catalyst bed catalyzes the decomposition of the oxidizing agent and oxidizable pollutants. The catalyst bed comprises an intimate mixture of an oxide of Group III, nickel oxide and, optionally, cobalt oxide, supported on pieces of a non-porous substantially inert material.
Claims9
A process for decomposing an oxidising agent in effluent to be oxidatively treated which comprises contacting said effluent with a catalyst bed comprising an intimate mixture of:
- (i) at least one finely divided oxide of an element (M) of Group III of the Periodic Table,
- (ii) finely divided nickel oxide,
- and/or hydrates of said Group III oxide or nickel oxide, supported on pieces of a non-porous substantially inert material, said intimate mixture containing 0.5 to 50% by weight of said Group III oxide (expressed as M.sub.2 O.sub.3).
A process of destroying oxidisable pollutants in an aqueous medium which comprises adding an oxidising agent to said medium and contacting said medium containing oxidising agent with a catalyst bed comprising an intimate mixture of:
- (i) at least one finely divided oxide of an element (M) of Group III of the Periodic Table,
- (ii) finely divided nickel oxide,
- and/or hydrates of said Group III oxide or nickel oxide, supported on pieces of a non-porous substantially inert material, said intimate mixture containing 0.5 to 50% by weight of said Group III oxide (expressed as M.sub.2 O.sub.3), whereby the catalyst bed catalyses the decomposition of the oxidising agent and oxidisable pollutants.
Dependencies are inferred from the claim text.