New diamond coatings for a safer electrolytic disinfection

Author(s)

Vernasqui, Lais Gimenes ; Santos, Gessica de Oliveira Santiago ; Isidro, Julia ; Silva, Taynara Oliveira ; Lanza, Marcos Roberto de Vasconcelos ; Saez, Cristina ; Ferreira, Neidenei Gomes ; Rodrigo, Manuel Andres Rodrigo

• Document type: Journal article
• Source: Environmental Science and Pollution Research; v. N/A, p. 10-pg., 2023-10-24.

Abstract

In this work, a new coating of boron-doped diamond ultra-nanocrystalline (U-NBDD), tailored to prevent massive formation of perchlorates during disinfection, is evaluated as electrode for the reclaiming of treated secondary wastewater by the electrochemically assisted disinfection process. Results obtained are compared to those obtained by using a standard electrode (STD) that was evaluated as a standard in previous research showing outstanding performance for this application. First tests were carried out to evaluate the chlorine speciation obtained after the electrolysis of synthetic chloride solutions at two different ranges of current densities. Concentrations of hypochlorite obtained using the U-NBDD anode at 25 mA cm(-2) were 1.5-fold higher, outperforming STD anode; however, at 300 mA cm(-2), an overturn on the behavior of anodes occurs where the amount of hypochlorite produced on STD anode was 1.5-fold higher. Importantly, at low current density the formation of chlorates and perchlorates is null using U-NBDD. Then, the disinfection of the real effluent of the secondary clarifier of a municipal wastewater treatment facility is assessed, where inactivation of Escherichia coli is achieved at low charge applied per volume electrolyzed (0.08 A h L-1) at 25 mA cm(-2) using the U-NBDD. These findings demonstrate the appropriateness of the strategy followed in this work to obtain safer electro-disinfection technologies for the reclaiming of treated wastewater. (AU)

• FAPESP's process: 19/08701-4 - Hydrogen peroxide electrosynthesis recharging gas thickness electrodes (EDG) modified with combined nanostructured metal oxides
• Grantee: Taynara Oliveira Silva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 20/02743-4 - Fe/RuO2-TiO2 films supported on carbon felt for norfloxacin degradation by heterogeneous electro-fenton process
• Grantee: Géssica de Oliveira Santiago Santos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/07615-7 - Novel boron-doped ultra nanocrystalline diamond/dioxide titanium nanotube/titanium (B-UNCDws/DTNT/Ti) as a porous composite to remove emergent pollutants from gases and urine
• Grantee: Laís Gimenes Vernasqui
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 22/07227-0 - Gas diffusion electrode based on carbon modified with benzophenone applied to co-generation of oxidants radicals in a reactor cell
• Grantee: Taynara Oliveira Silva
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 19/00592-1 - Degradation of carbamate agrochemicals from Advanced Oxidation Electrochemical Processes (AOEP) using boron doped diamond electrodes
• Grantee: Laís Gimenes Vernasqui
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 22/03386-6 - Treatment of VOCs by a combined absorption and heterogeneous electron-Fenton using iron-modified cathodes
• Grantee: Géssica de Oliveira Santiago Santos
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor