Optimization of the synthesis of a new coagulant from a tannin extract.
The current article studies the optimization of a new coagulant agent for water purification and wastewater remediation. Design of experiments is used for optimizing the production of this new tannin-based coagulant by using Acacia mearnsii de Wild tannin extract, NH(4)Cl and formaldehyde. The effectiveness of this product was confirmed on dye-polluted wastewater and surfactant wastewater. This cationic coagulant seems to be sensitive to temperature and tannin-NH(4)Cl ratio (g of ammonium chloride per g of tannin extract). NH(4)Cl ratio was found to be more influent than temperature and no interaction is presented between these two parameters. For each system, an optimum combination NH(4)Cl ratio and temperature was found: 24.9°C and 2 g g(-1) for dye removal and 36.4°C and 1.87 g g(-1) for surfactant elimination. The optimal conditions were merged to produce a combined coagulant that was tested on dye, surfactant, surface river water and municipal wastewater. Predicted levels of remediation were experimentally confirmed.
Universidad de Extremadura, Department of Chemical Engineering and Physical Chemistry, Avda. de Elvas s/n, 06071 Badajoz, Spain. jbelther@unex.es
J
J
Beltrán-Heredia
J
J
Sánchez-Martín
M A
MA
Dávila-Acedo
D000327:Adsorption; D000465:Algorithms; D002021:Buffers; D004396:Coloring Agents / Q000302:isolation & purification; D052918:Environmental Restoration and Remediation; D007202:Indicators and Reagents; D007220:Industrial Waste / Q000032:analysis*; D008670:Metals / Q000032:analysis; D015233:Models, Statistical; D009391:Nephelometry and Turbidimetry; D012996:Solutions; D013501:Surface-Active Agents / Q000737:chemistry; D013634:Tannins / Q000737:chemistry*; D013783:Textile Industry; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods
D002021:Buffers; D004396:Coloring Agents; D007202:Indicators and Reagents; D007220:Industrial Waste; D008670:Metals; D012996:Solutions; D013501:Surface-Active Agents; D013634:Tannins