Coupling zero-valent iron and sulfate radical (ZVI + SO4Ï-) for the removal of selected pesticides

• Grant number: 20/13823-9
• Support type: Regular Research Grants
• Duration: July 01, 2021 - June 30, 2023
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal researcher: Eduardo Bessa Azevedo
• Grantee: Eduardo Bessa Azevedo
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Assoc. researchers: Andrei Leitão ; Davi Gasparini Fernandes Cunha

Abstract

This research Project will study the removal of some of the most prevalent pesticides in water bodies of the São Paulo state. For that purpose, two processes will be coupled in a continuous, stationary state, single reaction system (no recycle): the ZVI process (a reductive process) and an advanced oxidation process (sulfate radical generated from persulfate). Initially, a multi-residue chromatographic method, capable of simultaneously identifying and quantifying the selected pesticides, will be developed. The system will be subjected to a multivariate optimization, using the Response Surface Methodology, aiming at maximizing the pesticides group removal. Besides the chemical tests necessary to follow the performance of the coupled processes, biological tests will also be performed: ecotoxicology (Raphidocelis subcapitata) and estrogenic activity (MCF-7 cells). If the pesticides are removed, but still remains a significant biological activity in the treated effluent, the optimization routine will be repeated, this time aiming at removing such activity. This project is expected to have a significant positive impact, as it proposes a simple, low-cost treatment system, which does not need the constant presence of operators, for the efficient removal of pesticides, a current challenge posed to Water and Wastewater Treatment Stations throughout the world. (AU)