Banca de QUALIFICAÇÃO: ALANA CAROLYNE CRISPIM

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ALANA CAROLYNE CRISPIM
DATE: 27/01/2023
TIME: 09:00
LOCAL: VIRTUAL
TITLE:

Electrochemical technology for the treatment of landfill leachate

KEY WORDS:

Wastewater treatment, electrochemical technology, electro-Fenton, environmental remediation

PAGES: 4122
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

Worldwide, most solid waste ends its life in landfill sites, which have a significant environmental impact in several respects. In particular, rainfall over landfill sites results in the production of an aqueous leachate containing compounds having low biodegradability, high toxicity, and a high organic load. To prevent the introduction of this toxic mixture to the environment, remediation measures are required. Electrochemical technologies are particularly suitable for wastewater purification and contaminant repurposing. Therefore, in this study, it was investigated the use of the electro-Fenton (EF) and photo electro-Fenton (PEF) processes to treat local landfill effluent with high salinity and high organic content (total organic carbon (TOC) = 1220 mg/L). Specifically, it was developed a flow cell containing a boron-doped diamond anode (BDD) and a carbon felt cathode (FC), and the effects of the applied current density (30, 60, or 90 mA cm^-2), H₂O₂ production, and UV radiation (UVC or UVA) on the chemical oxygen demand (COD) of the effluent were evaluated. Maximum oxidizability and mineralization of the solution were obtained on increasing the applied current density in which more than 90% of the total organic carbon (TOC) was removed after 240 min of PEF with the BDD anode at 90 mA cm^-2. Therefore, EF and PEF are efficient and effective approaches for the remediation of organic pollutants in landfill effluents, especially using the BDD anode. In addition, the acetic and formic acids (the final organic byproducts of effluent degradation) as well as Cl^-, NO₂^-, NO₃^-, and NH₄⁺ concentrations were assessed. Because of the low energy requirements of the electrochemical technologies and the potential for using renewable energy, the investment costs of these electrochemical technologies are low, making them promising methods for the treatment of landfill leachate in low-income countries.

COMMITTEE MEMBERS:
Presidente - 2275848 - ELISAMA VIEIRA DOS SANTOS
Externo ao Programa - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE - UFRNExterna à Instituição - DANYELLE MEDEIROS DE ARAUJO - CNPq
Externo à Instituição - JOSÉ EUDES LIMA SANTOS - UNESP