2021-04-162018-02-0101884999WOS;000432649100014SCOPUS;2-s2.0-85041513395http://hdl.handle.net/10784/29404The present study evaluates the sequential treatment of chemical coagulation (CC) followed by the advanced oxidation process (AOP) of Fenton (H2O2/Fe2+) or photoFenton (UV/H2O2/Fe2+) intensified by low frequency ultrasound. Optimization of the pretreatment step through CC by jar test showed that an optimal coagulant (Al-2[SO4](3)) dose of 800 mg/L removed 99 % of turbidity and 53 % of the chemical oxygen demand (COD). The resulting supernatant is used for the AOP evaluation. The statistical analysis of a Box-Behnken response surface design showed that optimal conditions to carry out the US/H2O2/Fe2+ process are: 1 mM de Fe2+, 14 mM de H2O2 and pH 3. Under these conditions the CC coupled to the US/H2O2/Fe2+ process removes 82 % of the COD of the supernatant while the US/UV/H2O2/Fe2+ process eliminates 95 % after 90 min of reaction. The use of ultrasound waves inducing an increase of 10 % in the process efficiency. The mineralization of pollutants during treatment as well as the H2O2 consumption were monitored.spaCentro de Ciencias de la Atmosfera, UNAMavanced oxidation processsonochemistryultrasoundBox-Behnkenoptimizationinfo:eu-repo/semantics/article2021-04-16GIL PAVAS EDISONArbelaez, Paula ElianaMedina, J.GOMEZ, CARLOS MARIO10.20937/RICA.2018.34.01.14