Phosphorus Removal Characteristics of Titanium Salts Compared with Aluminum Salt

초록

This study evaluates the efficacy of titanium tetrachloride (TiCl4) and titanium sulfate [Ti(SO4)(2)] on phosphorus (P) removal in synthetic wastewater compared with aluminum sulfate [Al-2(SO4)(3)]. Jar test experiments were performed at various chemical doses and initial pH (pH(i)) levels to determine the conditions at which P removal was most efficient. The doses with 99% P removal were 0.31 to 0.34 mM for TiCl4, 0.15 mM for Ti(SO4)(2), and 0.19 mM for Al-2(SO4)(3) as Al at 2 mg P/L, 100 mg CaCO3/L, and pH(i) = 7.0 to 8.0. The optimum pHi was 7 for TiCl4, 5.5 for Ti(SO4)(2), and 7 for Al-2(SO4)(3). The P-removal efficiencies were Ti(SO4)(2) > Al-2(SO4)(3) > TiCl4 at pH(i) 5.5, and TiCl4 approximate to Al-2(SO4)(3) > Ti(SO4)(2) at pH(i) 7 and 8.5. P-removal ability of TiCl4 decreased as alkalinity increased. Quadratic models successfully approximated the response surface for P removal efficiency with simultaneous changes in pHi and chemical concentrations [TiCl4 and Al-2(SO4)(3)].

키워드