| 摘要 |
1281637 Cyanide removal CALGON CORP 23 Dec 1970 [24 Dec 1969] 61188/70 Heading C1C A method of removing cyanide from water comprises maintaining in the water from ¢ to 2 equivalents of cupric or cuprous ion for each equivalent of CN- and maintaining an amount of oxygen in the water which is at least 6 mg./l. and at least equivalent to the CN- concentration, passing the water through a bed of activated charcoal at a rate sufficient to provide a contact time of at least 15 minutes and regulat - ing the addition of oxygen to the water so that the oxygen content of the effluent is at least 4 mg./l. Alternatively, the copper may be impregnated into the bed and this alternative method comprises maintaining in the water at least 6 mg./l. of oxygen and passing the water through an activated charcoal bed impregnated with 2-15% by weight of copper at a flow rate no greater than 0À5 U.S. gallons per min. per ft.<SP>3</SP> of carbon.
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