REMOVAL OF CYANIDE AND COLOR BODIES FROM COKE PLANT WASTEWATER

摘要

Wastewaters, from a coke oven by-product plant, containing cyanides and objectionable complex organic compounds are treated by a high density sludge process. The wastewaters are mixed with an aqueous high calcium lime slurry and a portion of the sludge formed in the process, which portion is recycled in the process. The aqueous high calcium lime slurry and the portion of recycled sludge are mixed for a time to obtain a uniform mix. A solution containing iron values is added to the uniform mix. Iron cyanide compounds and a portion of the complex organic compounds are precipitated. The precipitate is flocculated and is passed to a settling tank wherein the precipitate settles out to form a high density sludge.