Process for removal of inorganic and cyanide contaminants from wastewater
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United States of America Patent
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-
Mar 3, 1992
Grant Date -
N/A
app pub date -
May 24, 1990
filing date -
May 24, 1989
priority date (Note) -
Expired
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Abstract
An improved process for removal of soluble contaminants from wastewater is disclosed which provides significantly enhanced contaminant removal and overall process efficiencies. The improved contaminant removal process is especially suitable for treatment of industrial effluents having high levels of dissolved cyanide and arsenic contaminants. Wastewater undergoes multiple stage sludge treatment, wherein sludge is mixed with wastewater sequentially in a plurality of discrete reaction stages for relatively short retention times. Reaction conditions which promote chemical and/or physical reaction of soluble contaminants with sludge are maintained, and liquid/solids separation is effected after each sludge treatment stage. Oxidizing agent is preferably mixed with the wastewater prior to multiple stage sludge treatment to change the oxidation state of inorganic contaminants and remove cyanide contaminants from solution. Multiple stage sludge treatment may be combined with an improved ferric adsorption process to provide substantially complete removal of inorganic and/or cyanide contaminants.
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