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U in the solution. Cyanide is made by combining carbon and nitrogen. When it is oxidized, the harmless carbon dioxide and nitrogen are released. gases e oxidation reaction occurs with sodium hypochlorite in an alkali solution. A covered mixing tank with a mixer is required for the reaction. 2.264 Metal Precipitation and Sludge Thickening. Soluble metal salts occur in plating bath dumps, etching bath dumps, metal finishing rinse waters and the ion exchange regenerant solutions. In order for metal to be removed from a water solution, metal salts must be converted to insoluble hydroxides. Lime or sodium hydroxide is added to a mixing vat which precipitates the metal as a metal hydroxide. The sludge or hydroxide formed must also be clarified through adding a flocculant agent which aids in dropping or accumulating the sludge at the bottom of the mixing vat. The remaining process water is decanted out of the e vat. The wet sludge is then prepared for dewatering in the belt or filter press. The belt press is a mechanical and vacuum press which squeezes the water out of the remaining sludge or metal hydroxide material. The water content of the sludge at this stage is approximately 65% to 70% water. 2.265 Oily Water Emulsion Breaking. Oily waters cannot be discharged into the sewer system. They are collected and brought to the Facility to have the emulsion or stable mixture of oil in water broken. Emulsion breaking is accomplished ' by mild heating of the liquid and the addition of chemicals to reduce the molecular attraction between the oil and water e molecules. Once the emulsion has been broken, the oil will float to the surface and will be decanted into drums. Those drums will be shipped to a treatment or disposal facility as part of the normal organic 1 material storage and shipment process. 2.266 Drum Storage. All drums received for storage will be maintained in the ' appropriate area of the drum warehouse portion of the Facility. Upon receipt of sufficient material to provide for a full truckload shipment to an ultimate treatment or storage destination, organic material will be immediately loaded and transported as an outgoing shipment from the Facility. The storage and receipt of materials is more fully described in Sections 3 and 7. There will be materials recovered at the Facility as individual ' or single -metal hydroxides. If there is enough volume and economic value for resale of this material, it will be resold to metal smelters for i reuse 1 9.