| Autor: |
García-Estrada R; Coordinación de Ingeniería Ambiental, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar s/n, Ciudad Universitaria, Coyoacán, Ciudad de México 04510, México rramirezz@iingen.unam.mx., Arzate S; Coordinación de Ingeniería Ambiental, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar s/n, Ciudad Universitaria, Coyoacán, Ciudad de México 04510, México rramirezz@iingen.unam.mx., Ramírez-Zamora RM; Coordinación de Ingeniería Ambiental, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar s/n, Ciudad Universitaria, Coyoacán, Ciudad de México 04510, México rramirezz@iingen.unam.mx. |
| Abstrakt: |
Thiabendazole degradation (TBZ D ) in diferent types of water matrices was assessed by applying two Advanced Oxidation Processes, both using simulated solar light (SSL), copper slag (CS) as an iron based catalyst, and separately H 2 O 2 or NaOCl as oxidants. First, optimum conditions for TBZ D were evaluated in distilled water, TBZ D = 90% at 60 min for CS-H 2 O 2 -SSL, and 92% of TBZ D in a twelfth of the time by the system CS-NaOCl-SSL; minimum TBZ depletion variations were observed between the first and the fifth reuse test: 88 ± 2% for CS-H 2 O 2 -SSL (60 min) and 90 ± 1% for CS-NaOCl-SSL (5 min). Those conditions were tested using a synthetic (SE) and a real secondary effluent (RE) from a wastewater treatment plant. The CS-H 2 O 2 -SSL system achieved TBZ D of 88 and 77% after 90 min for SE and RE, with kinetic constants of 0.024 and 0.016 min -1 , respectively, whereas photo-NaOCl/Fe showed values of 0.365 and 0.385 min -1 for SE and RE, achieving a 94% TBZ D removal in both types of water at 10 min. That might be related to the formation of Cl · and HO • during the photo-NaOCl/Fe process, highlighting that the CS-NaOCl-SSL is an attractive option that has great possibilities for scaling up by a better knowledge in real aqueous matrices. |
