Banca de QUALIFICAÇÃO: ISRAEL GONÇALVES SALES DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ISRAEL GONÇALVES SALES DA SILVA
DATE: 03/08/2022
TIME: 14:00
LOCAL: IATI - Instituto Avançado de Tecnologia e Inovação
TITLE:

DEVELOPMENT OF TECHNOLOGIES FOR SOIL REMEDIATION USING SURFACTANT AGENTS

KEY WORDS:

Biodegradation; Biotechnology; Petroderivates; Green surfactants; Biosurfactants;Biobased surfactants.

PAGES: 167
BIG AREA: Outra
AREA: Multidisciplinar
SUBÁREA: Biotecnologia
SUMMARY:

Spills that occur in the exploration, distribution and storage of raw materials and lubricating oils are the main accumulations of petroderivatives in the environment. These characteristics present mutagenic, immunogenic and teratogenic characteristics, presenting a drastic change in the microbiological properties, suggesting physical and physical alterations of the human environment and perfectly irreparable for the human and qualified environment irreparable. The rapid application of a set of physical and biological techniques and operations is necessary to minimize the extent of environments that can be used to damage the environment. Choice as
other specific by-products for compatible, efficient soil treatment and a likely selection attempt, as the resulting products are usually derived from toxicity and causing problems. Therefore, green surfactants, i.e. two biobased surfactants, identified as biobased 1 and biobased 2, obtained by chemical synthesis, and a microbial surfactant produced by the Starmerella bombicola ATCC 22214 yeast were used as soil remediation agents and were compared to a synthetic surfactant (Tween 80). Three surfactants were tested for their ability to emulsify, disperse and remove hydrophobic contaminants. The biosurfactant, which was able to reduce the surface tension of water to 32.30 mN/m at a Critical Micelle Concentration (CMC) of 0.65 g/L, was used to prepare a commercial formulation, which showed less toxicity to the bioindicators tested and greater oil dispersion capacity compared to the biobased surfactants. All green surfactants resemble different emulsions, mainly with motor oil and petroleum and regarding the potential to remove motor oil adsorbed on soil types (sandy, silty and clayey and beach sand) in kinetic experiments (bottles) and static (packed columns). The commercial biosurfactant removed the contaminant especially in the sand beach (80.0± ± 0.14%) under static and kinetics conditions then the biobased surfactant 1. In kinetic experiments, commercial biosurfactant and biobased surfactant 2 were able to remove more motor oil from all tested soils than biobased surfactant 1. Finally, the commercial biosurfactant was tested as a soil bioremediation agent. In degradation experiments carried out in soils contaminated with oil from quasi-enriched sugarcane molasses, the degradation of the oil reached 90% after 60 days in the presence of the commercial biosurfactant, while it did not exceed 20% of degradation in the presence of only S. bombicola cells. The promise results contribute to the development of green technologies for the treatment of hydrophobic pollutants with gains for oil industries. In the next step, the green surfactants will be tested in the removal of hydrophobic contaminants in a Soil Remediation Mobile System (CSRMS) based on
a concrete mixer pilot system, built to allow the treatment of contaminated soils in situ by the new system.

BANKING MEMBERS:
Externa à Instituição - RAQUEL DINIZ RUFINO
Externa à Instituição - RITA DE CASSIA FREIRE SOARES DA SILVA
Interno - 079.743.104-72 - VALDEMIR ALEXANDRE DOS SANTOS - UNICAP