Center from Management of Technology and Information

São José do Egito, Brazil

Center from Management of Technology and Information

São José do Egito, Brazil
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Nascimento L.A.,Federal University of Pernambuco | Nascimento L.A.,Advanced Institute of Technology and Innovation IATI | Da Rocha Silva N.M.P.E.,Federal University of Pernambuco | Da Rocha Silva N.M.P.E.,Advanced Institute of Technology and Innovation IATI | And 5 more authors.
Chemical Engineering Transactions | Year: 2017

The industrial sector has adopted practices for minimize the impacts of large water use on water resources. Among these practices, the treatment of effluents is the most important because ensures that wastewater will be properly disposed and allows its reuse. The constant use of oil in industry causes a significant generation of oily effluents which leads to the need for effective treatment for this type of pollutant. Constructed wetlands (CWs) are systems created for the purpose of treating anthropogenic such as municipal or industrial wastewater. CWs are a cost-effective and technically feasible approach to treating wastewater and runoff for several reasons like low expenses (build, operation and maintenance), operation and maintenance periodic only, on-site labor and water reuse and recycling facilitation. The extremely adaptable sizing of constructed wetlands allows modifications to improve this treatment efficiency. For oily wastewater treatment, CWs filled with floating macrophytes can receive microbubbles nozzles in order to improve the system, increasing the drag of oil to the surface and the supply of oxygen to the aerobic microorganisms. In this work, the increase of the efficiency of oily wastewater treatment in constructed wetlands by addition of microbubbles was evaluated. Computational fluid dynamics (CFD) simulations in the software ANSYS to validate the fluid dynamic behavior of the system. Experimental tests in two constructed wetlands pilot prototypes, with and without addition of microbubbles were made in transparent acrylic. Initial and final concentrations of an oily wastewater in pilot prototypes were determined, as well as essential operation parameters. An oil collector was designed and installed to remove the free oil on the water surface, ensuring the maximum removal of oily waste on constructed wetland prototype. The experimental tests results showed that the final concentration on prototype without aeration was 34.3 mg/L. The final concentration of the aerated prototype was 11.6 mg/L, standing below of the limit of Brazilian Environmental Legislation (CONAMA Resolution no 430/2011), validating the efficiency increase of the treatment through a simple adaptation. © Copyright 2017, AIDIC Servizi S.r.l.


Sarubbo L.A.,Catholic University of Pernambuco | Sarubbo L.A.,Center from Management of Technology and Information | Luna J.M.,Catholic University of Pernambuco | Luna J.M.,Center from Management of Technology and Information | And 2 more authors.
Chemical Engineering Transactions | Year: 2015

This work describes the environmental application of a biosurfactant produced from Pseudomonas sp. cultivated in a mineral medium formulated with low-cost substrates. Fermentations were conducted in the mineral medium supplemented with 3 % corn steep liquor and 3 % molasses at 28 °C during 144 h under 200 rpm. The medium surface tension was reduced to 29 mN/m. A Critical Micelle Concentration (CMC) of 0.5 % was obtained from the isolated biosurfactant. The application of the biosurfactant demonstrated an ability to remove 80.0 % of motor oil adsorbed on beaker surfaces. Stone washing tests showed 48.0 % removal at 0.5 % biosurfactant concentration and testing for oil removal in soil results showed around 63.0 % for the removal of motor oil adsorbed on fresh sand. The results obtained with the biosurfactant produced by Pseudomonas sp., under the conditions tested above show the promising properties of this biomolecule for use in bioremediation of hydrophobic compounds in soils and waters. Copyright © 2015, AIDIC Servizi S.r.l.


Brasileiro P.P.F.,Catholic University of Pernambuco | Brasileiro P.P.F.,Center from Management of Technology and Information | De Almeida D.G.,Center from Management of Technology and Information | De Luna J.M.,Catholic University of Pernambuco | And 7 more authors.
Chemical Engineering Transactions | Year: 2015

Accidents in petroleum platforms happen because of the absence of an effective fluid control inside the pipes, as occurred in 2010, when the scientists were not prepared to treat the oil spill in the Deepwater Horizon platform. In such environmental accident, non-biodegradable chemical dispersants were applied. As a safe alternative for the environment, the combination of the biotechnological potential of the microorganisms and the low cost waste materials results in the production of biosurfactants, known as the petroleum bioremediators. Thus, the optimization of operational parameters for biosurfactant production by Candida guilliermondii UCP 0992 grown in a low-cost medium and formulated with 4.0 % of corn steep, 2.5 % of molasses and 2.5 % of soybean residual oil was carried out in a 1.2 L bioreactor using response-surface methodology. The application of a Rotate Central Composed Design (RCCD) led to the identification of agitation speed, aeration, time and inoculum size as significant variables affecting the fermentation process. The optimal levels of the aforementioned variables were 250 rpm agitation speed, 132 h of cultivation time, 0.5 L/min of filtrated air and 4 % inoculum size. The experimental verifications allowed a maximum relative surface tension reduction to 31.45 mN/m and interface tension reduction to 9.04 mN/m, which was found to be equivalent to about 30.2 g/L isolated biosurfactant as estimated gravimetrically, thereby resulting in an improved production. Besides the optimization of operational parameters, the economic cost of € 22.37 was estimated to the biosurfactant produced according to the local price of the kWh. This work, therefore, showed that the fermentation time spent in flasks (144 h), could be reduced in 12 hours, increasing 3.6 times the yield and keeping the surface and interface tensions at the lowest level. Moreover, the biosurfactant produced by C. guilliermondii shows potential to be applied in oil spills. Copyright © 2015, AIDIC Servizi S.r.l.

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