Treatment of silica effluents: ultrafiltration or coagulation-decantation.
In the electronics industry, the preparation of silicon plates generates effluents that contain a great amount of colloidal silica. Two processes--decantation and ultrafiltration--are studied with in view the treatment of the effluents released by the firm Rockwood Electronic Materials. The feasibility of each of the two processes is studied separately and their operating parameters optimized. Both processes allow the recovery of a great proportion of the initial effluent (over 89%) as transparent and colorless water that can be reused at the start of a line. In view of the results and of the compared advantages and disadvantages of the two processes, ultrafiltration will be selected for the industrial unit.
Ndiaye
P I
PI
Laboratoire en Procédés Propres et Environnement (LPPE-UMR 6181), Université Paul Cezanne, Europôle de l'Arbois, 13545 Aix en Provence cedex 04, France.
Moulin
P
P
Dominguez
L
L
Millet
J C
JC
Charbit
F
F
D003102:Colloids; D004581:Electronics; D005374:Filtration; D007220:Industrial Waste; D012822:Silicon Dioxide / Q000737:chemistry* / Q000302:isolation & purification*; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D003102:Colloids; D007220:Industrial Waste; D014873:Water Pollutants; D012822:Silicon Dioxide