International Journal of Advances in Engineering and Management (IJAEM)
Volume 2, Issue 6, pp: 689-962 www.ijaem.net ISSN: 2395-5252
DOI: 10.35629/5252-0206689692 | Impact Factor value 7.429 | ISO 9001: 2008 Certified Journal Page 689
Performance Evaluation of Industrial Wastewater
Stabilization Ponds in Brazil
Jose Roberto Rasi1, Roberto Bernardo2, Jose A. C. Pelloso3
1Prof. Eng., Faccap College, Tupã, Brazil
2Prof. Ph.D., Fadap College, Tupã, Brazil.
3Eng., Granol I. C. E. S/A, Osvaldo Cruz, Brazil.
Corresponding Author: Jose Roberto Rasi
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Date of Submission: 15-09-2020 Date of Acceptance: 29-09-2020
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ABSTRACT: The objective of this paper is to
analyse the removal of organic matter through the
performance of stabilization ponds of the vegetable
oil extraction industry. For that specifically, it
features and verifies the operation of two
stabilization ponds built-in series, one of them an
anaerobic type and the other a facultative aerated
type. The research is characterized as a case study
that uses laboratory analysis to evaluate the
collected material and discussion of results. It
appears that the residual water from the
stabilization ponds analysed in this specific case,
presents an effective performance, pointing to
superior results than the limit already specified in
Brazilian Standards.
KEYWORDS: Stabilization ponds; industrial
effluent; treatment plants.
I. INTRODUCTION
[1].The industrialization of oilseeds is currently one
of the most important processes in the agribusiness
system. Such importance is due to the demand for
its products and its by-products in the bioenergy,
cosmetics, and raw material industries like food
processing for human and animal consumption.
[2].Crude vegetable oils are extracted using solvent
hexane. In this type of extraction, the oil is depleted
of the oleaginous material through the commercial
solvent hexane distilled from petroleum.
The equipment that performs this operation is the
continuous extractor that leaves the oleaginous
material impregnated with the solvent.
After the extraction of oil contained in the soybean,
the mixture of oil and hexane solvent is called
miscella, from which the solvent is recovered by
evaporation in a closed circuit, leaving the crude
oil, still slightly contaminated with solvent. The
wastewater generated by the process ofcrude oil
extraction of soybeans has a high concentration of
organic matter in terms ofchemical oxygendemand
(COD), biochemical oxygen demand (BOD), and
fat, oils, and greases (FOG), which can cause
significant impact if released in its raw form, into
the environment.
The equipment necessary to reduce the
concentration of organic materials (FOG) and
oxygen demands (COD and BOQ) in such
wastewater, that fits legalstandards foremissions to
the environment has been adopted as a treatment
plant consisting of a sedimentation box, ponds
anaerobic and aerated facultative pond.The limits
established in the Brazilian environmental
standards will be presented in this paper, later on.
The flowchart for the extraction of soybean
vegetable oil by hexane solvent used by this
industrial plant is shown in Figure 1.1. It is visible
that from the preparation sector to the final process
where the wastewater is discharged, there is a
complex trajectory composed of many stages.
Fig 1.1 - Extraction of soybean vegetable oil by a
hexane solvent
Prevention and reduction of pollution
caused by wastewater can be achieved by direct
means of recycling and reusing it or by using
different treatments.
