Removal of cyanides by complexation with ferrous compounds
- Chester Environmental, Moon Township, PA (United States)
Alkaline chlorination, an oxidation process with chlorine (Cl{sub 2}) or hypochlorite (ClO{sup {minus}}), is the most widely accepted method of cyanide treatment. However, removal of cyanide from wastewater to the extent required by the effluent limits imposed by Federal and State regulatory authorities is practically impossible, especially when the majority of the cyanide is present as an iron-cyanide complex. One potential treatment method being further investigated uses ferrous (Fe{sup 2+}) compounds to react with free and complex cyanide ions and produce insoluble iron-cyanide complexes. However, sludges generated by this treatment method contain cyanide wastes which may be considered a hazardous waste by the US Environmental Protection Agency (US EPA). The studies reported in this paper demonstrate that ferrous (Fe{sup 2+}) precipitation can remove cyanide ions (both free and complex) to a concentration within the range of 1 to 2 mg/L. The wastewaters utilized in these tests were collected from a coke plant facility. Synthetic cyanide solutions were used in the studied as well. Ferrous compounds used in the studies included commercial-grade ferrous sulfate, commercial-grade ferrous chloride, and spent pickle liquor (containing ferrous ion). The desired effluent quality was successfully attained in the treatment of the above-mentioned wastewaters by using ferrous compounds as well as spent pickle liquor.
- OSTI ID:
- 250921
- Report Number(s):
- CONF-9507204-; TRN: IM9629%%234
- Resource Relation:
- Conference: 27. Mid-Atlantic industrial waste conference, Bethlehem, PA (United States), 9-12 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Hazardous and industrial wastes: Proceedings of the twenty-seventh Mid-Atlantic industrial waste conference; Sengupta, A.K. [ed.] [Lehigh Univ., Bethlehem, PA (United States)]; PB: 973 p.
- Country of Publication:
- United States
- Language:
- English
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