Mercury removal from latex paint waste water
Abstract
Abstract A PROCESS FOR THE REMOVAL OF ORGANIC MERCURY COMPOUNDS AND DISPERSED SOLIDS FROM WASTE WATER GENERATED IN THE MANUFACTURE OF WATER-THINNED PAINTS. THE WASTE WATER RECEIVES AN ADDITION OF PHOSPHORIC ACID UNTIL THE PH IS ADJUSTED TO ABOUT 3.0. A MAJOR PORTION OF THE ORGANIC MERCURY COMPOUND (E.G., PHENYL MERCURIC ACETATE) AND WATER-DISPERSIBLE SOLIDS PRECIPITATE FROM THE WASTE WATER. THE PRECIPITATE IS SEPARATED FROM THE WASTE WATER. THEN, THE WASTE WATER IS ADJUSTED TO A PH OF AT LEAST ABOUT 7.5 BY THE ADDITON OF CALCIUM HYDROXIDE SO THAT A SUBSTANTIALLY COMPLETE PRECIPITATION OF THE RESIDUAL ORGANIC MERCURY COMPOUND AND WATER-DISPERSIBLED SOLIDS IS OBTAINED. THE PRECIPITATED SOLIDS ARE RMEOVED FROM THE RELATIVELY MERCURY AND SOLIDS FREE WATER PHASE. THEN, THE WATER PHASE IS PASSED TO A SUBSEQUENT UTILIZATION THE PRECIPITATED MERCURY AND SOLIDS MAY BE TREATED TO PROVIDE A SUBSTANTIALLY DRY MATERIAL SUITABLE FOR LANDFILL. A WASTE WATER WITH ZERO MERCURY CONTENT CAN ALSO BE PRODUCED,
Inventors
- 👤 R Shoberg
- 👤 P Cravens
Bibliographic Details
Claims Analysis
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