Banca de DEFESA: ALANA CAROLYNE CRISPIM

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ALANA CAROLYNE CRISPIM
DATE: 11/04/2023
TIME: 13:30
LOCAL: VIRTUAL
TITLE:

Electrochemical technology for the treatment of landfill leachate

KEY WORDS:

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

PAGES: 110
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

Most solid waste ends up in landfills around the world, which hurts the environment in a number of ways. In particular, rain and waste decomposition in landfills result in the production of an aqueous leachate containing compounds with low biodegradability, high toxicity, and high organic load. To prevent the introduction of this toxic mixture into the environment, remedial measures are necessary. Electrochemical technologies are particularly suitable for wastewater purification and contaminant reuse. Therefore, in this study, the application of electro Fenton (EF) and photo electro Fenton (PEF) processes was investigated to treat local landfill effluent with high conductivity (k = 15.8 mS cm^-1) and high organic content (total organic carbon (TOC) = 1220 mg L^-1). Specifically, a flow cell containing a boron-doped diamond (BDD) anode and a carbon felt (CF) cathode was developed to evaluate the effects of applied current density (30, 60 or 90 mA cm^-2), production of H₂O₂, and the source of UV radiation (UVC and UVA) on the chemical oxygen demand (COD) of the effluent. In addition, acetic and formic acids (final organic by-products of effluent degradation), as well as inorganic ion concentrations (Cl^-, NO₂^-, NO₃^- and NH₄⁺ and PO₄^3-) were evaluated. Maximum degradation and mineralization of the effluent were obtained with increasing applied current density, at which more than 90% of the total organic carbon (TOC) was removed after 240 min of PEF UVC with the BDD anode at 90 mA cm^-2. Therefore, EF and PEF are efficient and effective solutions for the remediation of organic pollutants in landfill effluents, especially when using the BDD anode. The integration of technologies for wastewater treatment can significantly increase the degradation efficiency of organic compounds, as well as make electrochemical technologies a sustainable alternative, through the use of renewable energy for the treatment of leachate from landfills 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
Externo à Instituição - JOÃO MILLER DE MELO HENRIQUE