The aimof this work was to investigate the effectiveness of ultraviolet (UV) radiation alone and in combination with hydrogen peroxide for the oxidation of arsenic and terbuthylazine (TBA). The experimental tests were performed in groundwater at the laboratory scale (0.1 mg L−1 As(III) and 10 μg L−1 TBA). Hydrogen peroxide alone (15 mg L−1) was ineffective on both arsenic and TBA oxidation; the 253.7-nm radiation alone did not oxidize arsenic(III), but photolyzed efficiently TBA (52 % removal yield at a UV dose of 1,200 mJ cm−2). The UV/H2O2 advanced oxidation (UV dose 600–2,000 mJ cm−2, 5–15 mg L−1 H2O2) was the most effective process for the oxidation of both arsenic and TBA, with observed oxidation efficiencies of 85 and 94 %, respectively, with 5 mg L−1 H2O2 and a UV dose of 2,000 mJ cm−2.
UV/H2O2 oxidation of arsenic and terbuthylazine in drinking water
SORLINI, Sabrina;GIALDINI, Francesca;
2014-01-01
Abstract
The aimof this work was to investigate the effectiveness of ultraviolet (UV) radiation alone and in combination with hydrogen peroxide for the oxidation of arsenic and terbuthylazine (TBA). The experimental tests were performed in groundwater at the laboratory scale (0.1 mg L−1 As(III) and 10 μg L−1 TBA). Hydrogen peroxide alone (15 mg L−1) was ineffective on both arsenic and TBA oxidation; the 253.7-nm radiation alone did not oxidize arsenic(III), but photolyzed efficiently TBA (52 % removal yield at a UV dose of 1,200 mJ cm−2). The UV/H2O2 advanced oxidation (UV dose 600–2,000 mJ cm−2, 5–15 mg L−1 H2O2) was the most effective process for the oxidation of both arsenic and TBA, with observed oxidation efficiencies of 85 and 94 %, respectively, with 5 mg L−1 H2O2 and a UV dose of 2,000 mJ cm−2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
