DIAS, J.; http://lattes.cnpq.br/1097489947904498; DIAS, Joelma.
Resumen:
In this work, petroleum sludge oil was subjected to stabilization by solidification process, the
objective was to optimize the process responses, thus showing the best treatment related to
waste percentage and curing time, which leads to better response, and indicate oxygen
chemical demand and oils and greases maximum permissible limits to evaluate the resulting
material. To perform the optimization and propose limits, initially petroleum oily sludge and
the binder were characterized and classified. Then it was used the factorial optimization with
addition of three repetitions at the central point and additions of axial points, in the rotational
central composite design. The adopted factors were petroleum oily sludge percentage and
curing time. It was also performed the manufacturing of cementitious matrices incorporated
with the petroleum oily sludge from the optimization. This material was evaluated through
integrity and durability, immobilization of contaminants and environmental evaluation tests.
Cementitious matrices were also characterized using scanning electron microscopy and X-ray
diffraction tests and thermogravimetric analysis. The mass balance was performed, as well as
contaminant retention efficiency and statistical analysis, and the determintaion of oxygen
chemical demand and oils and greases maximum permissible limits in potable water and
wastewater for disposal in Brazil and worldwide. From a scientific point of view, one of the
contributions of this study was to propose the maximum permissible limit for oxygen
chemical demand, which was one thousand (1,000) milligrams per liter and, for the oils and
greases content was proposed one hundred (100) milligrams per liter, both for the leaching
test. For the solubilization test was proposed ten (10) milligrams per liter for oxygen chemical
demand and one (1) milligrams per liter for the oils and greases content. As a result of this
study it was demonstrated that the responses optimization is a way to minimize and/or
maximize the stabilization by solidification process response variables, in which was
observed that the best results are obtained when lower petroleum oily sludge percentage and
higher curing time values were used. This study allows us to affirm that it is possible to
optimize the stabilization by solidification process of stabilized and solidified material
incorporated with petroleum oily sludge and that the bringing of environmental evaluation
limits helps to ensure a proper oily waste disposal and proper final product use.
