Mostrar registro simples

dc.creatorChaprão, Marcos José
dc.date.accessioned2017-06-01T18:20:44Z
dc.date.accessioned2023-03-22T17:28:14Z
dc.date.available2015-06-08
dc.date.available2023-03-22T17:28:14Z
dc.date.issued2015-05-18
dc.identifier.urihttps://hdl.handle.net/20.500.12032/76172
dc.description.abstractThe biosurfactants, tension active compounds produced by microorganisms, have been successfully used in bioremediation processes and soil washing since the efficiency of these biomolecules in increasing the dispersion and the biodegradation of hydrocarbons. Their properties such as low toxicity and biodegradability are also very attractive for environmental applications. Thus, this study investigated potential application of two biosurfactants for enhanced removal capability and biodegradation of motor oil contaminated sand under laboratory conditions. The biosurfactants were produced by the yeast Candida sphaerica and by the bacterium Bacillus sp. cultivated in low-cost substrates. The ability of removing motor oil from soil by the two biosurfactants was identified and compared with that of the synthetic surfactants Tween 80 and Triton X-100. Both crude and isolated biosurfactants showed excellent effectiveness on motor oil removal from contaminated sand under kinetic conditions (70-90%), while the synthetic surfactants removed between 55 and 80% of the oil under the same conditions. The increase in biosurfactants and synthetic surfactants concentration did not enhance the removal of oil. A contact time of 5-10 min under agitation seemed to be enough for oil removal with the biosurfactants and synthetic surfactants tested. The crude and the isolated biosurfactant produced by C. sphaerica were able to remove high percentages of motor oil from packeded comumns (around 90%) when compared to the biosurfactant from Bacillus sp. (40%). For the degradation experiments conducted in motor oil contaminated sand enriched with sugar cane molasses, however, oil degradation was approximately 100% after 90 days in the presence of B. sp. cells, while the percentage of oil degradation did not exceed 50 % in the presence of C. sphaerica. The presence of the biosurfactants increased the degradation rate in 10-20%, especially during the first 45 days of the experiments, indicating that biosurfactants acted as efficient enhancers for hydrocarbon biodegradation. The results indicated the biosurfactants enhancing capability on both removal and rate of motor oil biodegradation in soil systems.eng
dc.formatapplication/pdfpor
dc.languageporpor
dc.publisherUniversidade Católica de Pernambucopor
dc.rightsAcesso Abertopor
dc.subjectbiorremediaçãopor
dc.subjectbiosurfactantespor
dc.subjecthidrocarbonetospor
dc.subjectpetróleopor
dc.subjectleveduraspor
dc.subjectcandida sphaericapor
dc.subjectBacillus sp.por
dc.subjectdissertaçõespor
dc.subjectbioremediationeng
dc.subjectbiosurfactantseng
dc.subjecthydrocarbonseng
dc.subjectoileng
dc.subjectyeastseng
dc.subjectcandida sphaericaeng
dc.subjectBacillus sp .eng
dc.subjectdissertationseng
dc.titleAplicação de biossurfactantes na remediação de areia contaminada com hidrocarbonetospor
dc.typeDissertaçãopor


Arquivos deste item

ArquivosTamanhoFormatoVisualização
marcos_jose_chaprao.pdf527.8Kbapplication/pdfVisualizar/Abrir

Este item aparece na(s) seguinte(s) coleção(s)

Mostrar registro simples


© AUSJAL 2022

Asociación de Universidades Confiadas a la Compañía de Jesús en América Latina, AUSJAL
Av. Santa Teresa de Jesús Edif. Cerpe, Piso 2, Oficina AUSJAL Urb.
La Castellana, Chacao (1060) Caracas - Venezuela
Tel/Fax (+58-212)-266-13-41 /(+58-212)-266-85-62

Nuestras redes sociales

facebook Facebook

twitter Twitter

youtube Youtube

Asociaciones Jesuitas en el mundo
Ausjal en el mundo AJCU AUSJAL JESAM JCEP JCS JCAP