Banca de QUALIFICAÇÃO: VIVIAN MARIA DE ARRUDA MAGALHÃES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : VIVIAN MARIA DE ARRUDA MAGALHÃES
DATE: 17/12/2019
TIME: 08:30
LOCAL: Auditório do PPGEQ
TITLE:

Treatability studies using clay-based catalyst in advanced oxidation process for remediation of PAHs contaminated soil

KEY WORDS:

Chemical oxidation. Organic pollutants. Persulfate. Hydrogen peroxide. Polycyclic aromatic hydrocarbon.

PAGES: 133
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Polycyclic aromatic hydrocarbons (PAHs), constituents of petroleum and its derivatives and formed mainly by partial combustion of organic matter, are persistent organic pollutants of varying toxicity. PAHs can be found predominantly in soil, due to their physicochemical properties, therefore the remediation of PAHs contaminated areas is a major challenge due to soil heterogeneity. Several technologies for remediation of PAHs contaminated soils have been proposed with varying success degrees, including the advanced oxidative process. Different oxidants with many activation forms for radical generation have been investigated. The oxidant activation can occur by homogeneous process, with iron as the most commonly used, or heterogeneous, with solid catalysts supporting an active phase, for example. The effectiveness of the remediation technique is predicted by laboratory treatability studies. Thus, the present work evaluated the chemical oxidation of PAHs contaminants in artificially contaminated soil through treatability assays aiming at in situ chemical oxidation. Hydrogen peroxide or sodium persulfate processes with activation by homogeneous reaction using iron sulfate and pH adjustment or heterogeneous reaction using solid catalyst were evaluated. Solid catalyst synthesis was developed employing iron ions as active phase supported on clay. The experiments were optimized applying an experimental design technique to appraise suitable concentrations that would provide better removal efficiency of the contaminant under study. Kinetic studies and distribution evaluation of each contaminant in different phases were performed. The oxidation process employing the clay-based catalyst provided satisfactory results of removal of PAHs from the system with reproducible assays. And, although homogeneous processes have slightly higher removals compared to heterogeneous processes under the applied conditions, the amount of iron required in the heterogeneous reaction was lower and the non-adjustment pH are significant advantages related to cost reduction and environmental caution.

BANKING MEMBERS:
Presidente - 1149554 - OSVALDO CHIAVONE FILHO
Externa ao Programa - 2668814 - MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
Externa à Instituição - MARIA CARLENISE PAIVA DE ALENCAR MOURA - UFRN
Externa à Instituição - MARILDA MENDONÇA GUAZZELLI RAMOS VIANNA - USP