Author(s)

Díaz Rodea Sebastián¹, Solís Correa Hugo Eduardo¹, Gómez Salazar Sergio², Giacomán Vallejos Germán³, Méndez Novelo Roger Iván³, Barceló Quintal Icela Dagmar^1*

¹Department of Basic Sciences, Autonomous Metropolitan University, Azcapotzalco, Mexico City, Mexico.
²Department of Chemical Engineering, University Center for Exact Sciences and Engineering, University of Guadalajara, Guadalajara, Jalisco, México.
³Faculty of Engineering, Autonomous University of Yucatán, Mérida, Yucatán, Mexico.

In this paper it is presented the results of advanced oxidation of leachates from a technified sanitary landfill located in the State of Querétaro, Mexico. One characteristic of already stabilized leachates from sanitary landfills like this case, is their difficult degradation, mainly because the organic matter contained is recalcitrant. For the samples collect, four sites were selected, where three points per site were sampled, measuring at each site the parameters: temperature, pH, conductivity, redox potential (ORP) and dissolved oxygen (DO) and leachate samples were collected. On the other hand, the Chemical Oxygen Demand (COD) of crude leachates, leachates acidified and leachates oxidized by Fenton reagent and Ozone-UV combined were analyzed. COD was used to monitor the degradation kinetics. With the results, the ArcGIS software was applied to study the distribution of temperature, dissolved oxygen and COD mainly in the leachate lagoon. For the application of Fenton reagent in the crude leachate oxidation, the pH was first adjusted and Fe²⁺/H₂O₂ ratio was optimized. The efficiency of Ozone-UV treatments was studied through COD degradation kinetics. The graphs of in (Ci/Co) vs time, showed that the kinetic processes are of order one, with very acceptable regression coefficients (R²) and extraordinarily similar speed constants (K). With Fenton oxidation, the highest percentage of COD degradation was achieved and with Ozone-UV oxidation, it was possible to practically degrade all the COD.

Landfill, Leachate, Fenton Oxidation, Ozone-UV Oxidation, Degradation Kinetics

Sebastián, D. , Hugo Eduardo, S. , Sergio, G. , Germán, G. , Roger Iván, M. and Dagmar, B. (2021) Treatment Processes of Leachate from a Landfill by Advanced Oxidation Fenton and Ozone-UV. Journal of Environmental Protection, 12, 755-766. doi: 10.4236/jep.2021.1210045.