الفهرس | Only 14 pages are availabe for public view |
Abstract The present study of abating mercury pollution was • based upon mercu=y removal by precipitation as mercury sulfide and mercury recovery by solubilization as mer- cury tetrachlor~de complex. The precipitation process was studied both in laboratory and pilot plant. The parameters investigated were pH, sodium sulfide dosage, type and dose =f synthetic polyelectrolyte coagulant, aeration, and c=mbination of aeration and coagulant addition. The pi:ot plant test was carried out on 600 1 composite wastewater samples to simulate the opti~um values arrived at in the laboratory.The composite 600 1 waste water samples were prepared from individual con- taminated effluent streams in proportions equivalent to their average flow rates. In the solubilization pro- cess the effects of solution pH and dose of sodium hypochlorite were investigated in the laboratory. Filt rab~lity of the slurry after mercury solubilization was then studied. Different organic and inorganic coagu- lants, at different concentrations, were added and the behavior upon f~ltration at different pH values under vacuum was studied. A proposed method of treatment was described and a ~rocess flow sheet was included. |