Effect of Tannins on Phosphate Removal Using Alum

Authors : Mahmut ÖZACAR, İ Ayhan ŞENGİL

Pages : 227-236

Doi:10.3906/sag-1203-89

View : 17 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Phosphate removal from wastewater can be achieved either through chemical removal, advanced biological treatment or a combination of both. Chemical phosphate removal involves the addition of aluminum, iron and calcium salts to achieve phosphate precipitation. The effectiveness of tannin obtained from valonia as a coagulant aid was investigated using various doses, together with Al2insert ignore into journalissuearticles values(SO4);3 in a jar test. Jar tests were conducted in a synthetic water containing varying concentrations insert ignore into journalissuearticles values(1-20 mg/L); of phosphate. Al2insert ignore into journalissuearticles values(SO4);3 was effective in the removal of phosphate from synthetic water. Both insert ignore into journalissuearticles values(Al2insert ignore into journalissuearticles values(SO4);3 + tannin); and insert ignore into journalissuearticles values(Al2insert ignore into journalissuearticles values(SO4);3 + AN913, synthetic anionic polyelectrolyte); were more effective than Al2insert ignore into journalissuearticles values(SO4);3 alone. Tannin and AN913 as coagulant aids gave similar phosphate removals in cases of high phosphate concentrations insert ignore into journalissuearticles values(10-20 mg/L);. However, tannin was more effective than AN913 in cases of low phosphate concentrations insert ignore into journalissuearticles values(1-5 mg/L);.
Keywords : Tannins, Polyelectrolyte, Coagulant aid, Phosphate removal, Chemical precipitation