Removal of tungsten oxyanions from industrial wastewater by precipitation, coagulation and flocculation processes.
Tungsten removal from industrial wastewater by precipitation, coagulation and flocculation processes using ferric chloride is reported. Suitable process conditions (pH, ferric chloride concentration) were established in jar tests performed with wastewater samples. Alkaline wastewater was treated with ferric chloride and pH was adjusted to various points using sulphuric acid. Tungsten removal was found to be most efficient (98-99%) in acidic conditions (pH<6). The process conditions were also found to be suitable for operation of an industrial scale wastewater treatment facility. More than 97% of tungsten were removed and the residual concentration was smaller than 10 ppm.
Plattes
Mario
M
Centre de Ressources des Technologies pour l'Environnement, Centre de Recherche Public Henri Tudor, 66, rue de Luxembourg (BP 144), L-4002 Esch-sur-Alzette, Luxembourg. mario.plattes@tudor.lu
Bertrand
Alexandre
A
Schmitt
Bianca
B
Sinner
Jean
J
Verstraeten
François
F
Welfring
Joëlle
J
D011232:Chemical Precipitation; D002712:Chlorides; D005290:Ferric Compounds; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D013464:Sulfuric Acids; D014414:Tungsten / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D002712:Chlorides; D005290:Ferric Compounds; D007220:Industrial Waste; D013464:Sulfuric Acids; D014874:Water Pollutants, Chemical; C033158:sulfuric acid; C024555:ferric chloride; D014414:Tungsten