Removal of Lignin from Water by Precipitate Flotation

by Mu-Hao Wang, Res. Fellow; Dept. of Civ. and Envir. Engrg., Rutgers Univ., New Brunswick, NJ,
Marvin L. Granstrom, Prof.; Dept. of Civ. and Envir. Engrg., Rutgers Univ., New Brunswick, NJ,
Thomas E. Wilson, Chem. Engr.; Greeley and Hansen Engrs., Chicago, IL,
Lawrence K. Wang, Asst. Prof.; Bio-Envir. Engrg. Div., Rensselaer Polytechnic Inst., Troy, NY,

Serial Information: Journal of the Environmental Engineering Division, 1974, Vol. 100, Issue 3, Pg. 629-640

Document Type: Journal Paper


Flotation was effective for the removal of lignin from aqueous solution when alum (aluminum sulfate) was used as a precipitator and a cationic surface-active agent, such as a quarternary ammonium compound, was used as a collector. Lignin fractional removal of higher than 0.94 was obtained by using 40 mg/l of alum and 40 mg/l of quaternary ammonium compounds (as cetyldimethylbenzylammonium chloride) per 100 mg/l of lignin (as Indulin C). Initial pH values between 2 and 4 were found to be optimal. The superficial gas velocity should be controlled at some optimum value; for this research the value was 24.2 cm/min. Assuming a wastewater containing 100 mg/l of lignin (as Indulin C) is treated with 40 mg/l of alum and 63.3 mg/l of Arquad 2HT-75 (i.e., 40 mg/l as cetyldimethylbenzylammonium chloride) in a precipitate flotation system, the total treatment costs including chemicals would be $0.352/1,000 gal (or $0.093/1,000 l).

Subject Headings: Chemical treatment | Water management | Ammonia | Chloride | Aluminum (chemical) | Sulfates | Surface-active agents | pH

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