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Previous issue date: 2015-02-02 / Durante o processo de refino do petr?leo tem-se como descarte um grande volume
de ?gua, a qual carrega os contaminantes provenientes do processo. Uma classe de compostos
contaminantes, decorrente da ind?stria petroqu?mica, s?o os hidrocarbonetos poliarom?ticos
(HPA?s). Visando avaliar a biodegrada??o do Dibenzotiofeno presente na ?gua de refinaria
preparou-se um efluente sint?tico para ser tratado utilizando lodos ativados. Para isso,
realizou-se um planejamento composto central 2? com triplicata no ponto central e 6 pontos
axiais tendo como vari?veis independentes (fatores) a concentra??o inicial de DBT, o pH e o
tempo de biodegrada??o. A presen?a do DBT, e de seu derivado 2-HBF, no efluente final
tratado pelo sistema de lodos ativados foi monitorada efetuando-se uma extra??o l?quido -
l?quido com posterior an?lise em CLAE/UV utilizando-se uma metodologia otimizada no
presente estudo. A biodegrada??o do DBT foi verificada monitorando-se os par?metros DQO,
pH, temperatura, SST, SSV, VFL, IVL. Quanto ? adequa??o das an?lises cromatogr?ficas, os
resultados indicaram que a metodologia avaliada pode ser utilizada no acompanhamento da
degrada??o de DBT e 2-HBF por lodos ativados, visto que foram obtidos ?timos valores de
linearidade, coeficientes de varia??o, assim tamb?m como percentuais de recupera??o
bastante satisfat?rios. Para os testes de efici?ncia de redu??o da DQO foi obtido um
percentual m?dio de 64,4 %. Os comportamentos crescentes dos resultados para os testes de
SST e SSV mostraram que os lodos ativados foram bem adaptados. As melhores condi??es
operacionais para redu??o de DQO foram verificadas quando operados com concentra??es
medianas de DBT, maiores tempo para biodegrada??o, e pH tanto na faixa ?cida quanto na
b?sica. A biodegrada??o do DBT foi confirmada avaliando-se a presen?a do 2-HBF. As
maiores concentra??es de 2-HBF foram obtidas nos extremos das concentra??es de DBT e de
pH, e em maiores tempos de biodegrada??o. / During the oil refining process a huge discard volume of water occurs, which carries the
contaminants from the process. A class of contaminant compounds resulting from the
petrochemical industry are the Polyaromatic Hydrocarbons (PAH's). To evaluate the
biodegradation of Dibenzothiophene in refinery water a synthetic wastewater was prepared to
be treated using activated sludge. For this, a 2
3 Composite Design (plus 3 central points and
six axial points) was carried out. The planning had as independent variables (factors) the
initial concentration of DBT, pH and time of biodegradation. Biodegradation of DBT was
assayed following the parameters COD, pH, temperature, SS, VSS, FVS, SVI. Concerned to
the chromatographic conditions, a methodology was validated in order to verify the presence
of DBT and its metabolite, 2-HBF, in the final wastewater treated by activated sludge system
using a liquid - liquid extraction coupled to HPLC / UV analysis. The parameters used for
validation were DL, QL, linearity, recovery and repeatability. As for optimization, the results
indicated that the studied methodology can be used in monitoring the DBT degradation and 2-
HBF by activated sludge, as they showed excellent linearity values, coefficients of variation,
so as satisfactory recovery percentage. COD reduction efficiency tests showed an average
percentage of 64.4%. The increasing trend for the results for the TSS and VSS tests showed
that the activated sludge was well tailored. The best operating conditions for the reduction of
COD were observed when operated with median concentrations of DBT, a higher time to
biodegradation, and pH in both the acidic range as the basic one. The biodegradability of the
DBT was confirmed by determining the presence of HBF-2. The highest concentrations of
HBF-2 were obtained in extreme concentrations of DBT and pH, and higher biodegradation
times.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20027 |
| Date | 02 February 2015 |
| Creators | Sousa, Paula Luciana Rodrigues de |
| Contributors | 87510383404, http://lattes.cnpq.br/4330639792072559, Paulo, Jo?o Bosco de Ara?jo, 16838572400, http://lattes.cnpq.br/4322467752580322, Ara?jo, Sarah de Abreu Moreira, 97469106391, Macedo, Gorete Ribeiro de, Santos, Everaldo Silvino dos |
| Publisher | Universidade Federal do Rio Grande do Norte, P?S-GRADUA??O EM ENGENHARIA QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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