Banca de QUALIFICAÇÃO: RAYANNE MACÊDO ARANHA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RAYANNE MACÊDO ARANHA
DATE: 19/12/2019
TIME: 09:00
LOCAL: Auditório do PPGEQ
TITLE:

Treatability studies of creosote contaminated soil applying advanced oxidative
process using iron chelate activated persulfate

KEY WORDS:

Soil remediation; Advanced oxidation process; Persulfate; Creosote;
Polycyclic aromatic hydrocarbons

PAGES: 52
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

A significant portion of contaminated soil contains organic liquid pollutants known as
Non-Aqueous Phase Liquids (NAPLs). Creosote is a type of DNAPL (Dense Non-
Aqueous Phase Liquids) and therefore has the ability to migrate to significant
subsurface depths until it reaches an impermeable layer where it accumulates. Thus, it
may be present at different stages in the underground medium, such as vapor, dissolved
and sorbed NAPL (residual and free). It is a complex mixture of organic constituents
containing mainly aromatic polycyclic hydrocarbons (HPAs). HPAs are persistent
organic pollutants that tend to adsorb into solid particles due to their physicochemical
properties. Advanced oxidation processes can be applied to remedy contaminated sites
with HPAs through the use of oxidizing agents such as persulfate. This oxidant can be
activated by iron ions generating sulfate free radicals () that react with organic species
causing partial or complete mineralization. In this work, the partitioning of HPAs
contained in creosote between vapor, aqueous, DNAPL and sorbed phases was
evaluated. In addition, treatability assays using iron chelate activated persulphate were
applied to sandy soils artificially contaminated with creosote and phenanthrene. From
the phase distribution evaluation, the highest contaminant concentration was detected in
the sorbed phase. Treatability trials performed on creosote contaminated soil showed
that 61.4% of the PAHs selected were removed. Phenanthrene (PHE) has been shown to
be one of the most recalcitrant HPAs. Thus, treatability tests on phenanthrene
contaminated soil were performed and higher removal percentages were obtained and it
was possible to reach levels below the intervention value established by the
Environmental Company of São Paulo (CETESB) for industrial areas. Kinetic assays
indicated that the degradation kinetics of PHE adequately fit a second order model.
Based on the results of this study, chemical oxidation proved to be an effective
remediation technology for soil contamination by HPAs.

BANKING MEMBERS:
Presidente - 1149554 - OSVALDO CHIAVONE FILHO
Interno - 1670497 - HUMBERTO NEVES MAIA DE OLIVEIRA
Externa ao Programa - 2668814 - MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
Externa à Instituição - MARILDA MENDONÇA GUAZZELLI RAMOS VIANNA - USP