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Phosphorus Removal Characteristics of Titanium Salts Compared with Aluminum Salt
Author(s) -
Jeon KyeongJun,
Kim JongHo,
Ahn JohngHwa
Publication year - 2017
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x14839994522902
Subject(s) - titanium , alkalinity , sulfate , chemistry , phosphorus , nuclear chemistry , aluminium , titanium tetrachloride , salt (chemistry) , organic chemistry
This study evaluates the efficacy of titanium tetrachloride (TiCl 4 ) and titanium sulfate [Ti(SO 4 ) 2 ] on phosphorus (P) removal in synthetic wastewater compared with aluminum sulfate [Al 2 (SO 4 ) 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 TiCl 4 , 0.15 mM for Ti(SO 4 ) 2 , and 0.19 mM for Al 2 (SO 4 ) 3 as Al at 2 mg P/L, 100 mg CaCO 3 /L, and pH i = 7.0 to 8.0. The optimum pH i was 7 for TiCl 4 , 5.5 for Ti(SO 4 ) 2 , and 7 for Al 2 (SO 4 ) 3 . The P‐removal efficiencies were Ti(SO 4 ) 2 > Al 2 (SO 4 ) 3 > TiCl 4 at pH i 5.5, and TiCl 4 ≈ Al 2 (SO 4 ) 3 > Ti(SO 4 ) 2 at pH i 7 and 8.5. P‐removal ability of TiCl 4 decreased as alkalinity increased. Quadratic models successfully approximated the response surface for P removal efficiency with simultaneous changes in pH i and chemical concentrations [TiCl 4 and Al 2 (SO 4 ) 3 ].