Inactivation of helminth eggs in an electro-Fenton reactor: Towards full electrochemical disinfection of human waste using activated carbon

• Published in: Chemosphere (Oxford) 2020-07, Vol.250, p.126260, Article 126260
• Main Authors: Robles, Irma, Becerra, Emmanuel, Barrios, J.A., Maya, C., Jiménez, B., Rodríguez-Valadez, Francisco J., Rivera, Fernando, García-Espinoza, Josué D., Godínez, Luis A.
• Format: Article
• Language: English
• Subjects: Advanced oxidation processes; Animals; Charcoal; Computer Simulation; Disinfection - methods; Electro-Fenton; Electrochemical disinfection; Escherichia coli; Helminth egg inactivation; Helminths; Human wastewater treatment; Humans; Hydrogen Peroxide - chemistry; Oxidation-Reduction; Waste Disposal, Fluid - methods; Wastewater
• ISSN: 0045-6535; 1879-1298; 1879-1298
• DOI: 10.1016/j.chemosphere.2020.126260

The disinfection of helminth eggs and Escherichia coli contaminated aqueous solutions, was studied using an electro-Fenton reactor equipped with a polarized activated carbon (AC) packed bed and two chambers loaded with cation exchange resins. Experiments using different arrangements and operation conditions, revealed that effective elimination of Escherichia coli takes place in all electrochemical disinfection tests. For the more resistant helminth eggs however, adsorption, electro-oxidation and electro-Fenton experiments showed retention within the reactor and pathogen inactivation values of 0, 16, and 25%, respectively. Using helminth eggs concentration data in different sections of the reactor, optical microscopy analysis and an exploratory computer simulation, differences in the disinfection performance were explained and new recirculation and flow direction and polarization switching operation schemes were defined. The corresponding experiments revealed that the effective coupling between adsorption and electro-Fenton phenomena, all along the AC packed bed compartment, results in 100% inactivation of helminth eggs. [Display omitted] •An activated carbon bed was used in an electro-Fenton reactor for disinfection purposes.•E. Coli elimination was achieved in electrochemical experiments.•An alternating electro-Fenton process is capable of fully inactivating helminth eggs.•The approach points to the development of competitive electro-Fenton disinfection technology.