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Previous issue date: 2014-10-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Neste trabalho, o tratamento de efluentes da ind?stria t?xtil, contendo corantes como
Amarelo de Novacron (YN), Vermelho de Remazol BR (RRB) e Azul de Novacron CD (NB),
e o tratamento de efluentes da ind?stria do petr?leo (?gua produzida), foram investigadas por
oxida??o an?dica (AO) com ?nodos de Platina suportada em tit?nio (Ti/Pt) e Diamante
Dopado com Boro (DDB). Certamente, um dos principais par?metros neste tipo de tratamento
? o tipo de material eletrocatal?tico utilizado, uma vez que os mecanismos e os produtos de
algumas rea??es an?dicas dependem dele. A eletr?lise galvanost?tica dos efluentes sint?ticos
RRB, NB e YN foi investigada a fim de encontrar as melhores condi??es para a remo??o da
cor e da carga org?nica do corante. De acordo com os resultados experimentais obtidos, o
processo de OA ? adequado para descolora??o de ?guas residuais contendo esses corantes
t?xteis, devido ?s propriedades eletrocatal?ticas de DDB e Pt. A remo??o da carga org?nica foi
mais eficiente com DDB, em todos os casos, e os corantes foram degradados ? ?cidos
carbox?licos alif?ticos no final da eletr?lise. Consumo de energia para a remo??o de cor
durante OA das solu??es sint?ticas de RRB, NB e YN depende principalmente das condi??es
de funcionamento, por exemplo, RRB, passa de 3,30 kWh m-3
em 20 mA cm-2
para 4,28 kWh
m
-3
em 60 mA cm-2
(pH = 1); 15,23 kWh m-3
em 20 mA cm-2
para 24,75 kWh m-3
em 60 mA
cm-2
(pH = 4,5); 10,80 kWh m-3
em 20 mA cm-2
para 31,5 kWh m-3
em 60 mA cm-2
(pH = 8)
(dados estimados por volume de efluente tratado). No estudo da OA da ?gua produzida de
petr?leo, as eletr?lises galvanost?ticas no ?nodo de DDB levaram ? completa remo??o de
DQO (98%), devido ?s grandes quantidades de radicais hidroxila e peroxodissulfatos gerados
a partir da oxida??o da ?gua e sulfatos em solu??o, respectivamente. A taxa de remo??o da
DQO aumenta com o incremento da corrente aplicada (15-60 mA cm-2
). Por outro lado, no
eletrodo de Pt, aproximadamente 50% de remo??o da carga org?nica foi alcan?ada atrav?s da
aplica??o de 15 a 30 mA cm-2
e 80% de remo??o de DQO a 60 mAcm-2
. Dessa forma, os
resultados obtidos na aplica??o desta tecnologia foram satisfat?rios dependendo do material
eletrocatal?tico e das condi??es operacionais utilizadas, tanto para remo??o de carga org?nica
em efluentes t?xteis e petroquimicos quanto para remo??o de cor, no caso dos efluentes
t?xteis. Portanto, a aplica??o do tratamento eletroqu?mico pode ser considerada como uma
alternativa vi?vel no pr?-tratamento ou tratamento de efluentes derivados da ind?stria t?xtil e
petroqu?mica. / In this work, the treatment of wastewater from the textile industry, containing dyes as
Yellow Novacron (YN), Red Remazol BR (RRB) and Blue Novacron CD (NB), and also, the
treatment of wastewater from petrochemical industry (produced water) were investigated by
anodic oxidation (OA) with platinum anodes supported on titanium (Ti/Pt) and boron-doped
diamond (DDB). Definitely, one of the main parameters of this kind of treatment is the type
of electrocatalytic material used, since the mechanisms and products of some anodic reactions
depend on it. The OA of synthetic effluents containing with RRB, NB and YN were
investigated in order to find the best conditions for the removal of color and organic content
of the dye. According to the experimental results, the process of OA is suitable for
decolorization of wastewaters containing these textile dyes due to electrocatalytic properties
of DDB and Pt anodes. Removal of the organic load was more efficient at DDB, in all cases;
where the dyes were degraded to aliphatic carboxylic acids at the end of the electrolysis.
Energy requirements for the removal of color during OA of solutions of RRB, NB and YN
depends mainly on the operating conditions, for example, RRB passes of 3.30 kWh m-3
at 20
mA cm-2
for 4.28 kWh m-3
at 60 mA cm-2
(pH = 1); 15.23 kWh m-3
at 20 mA cm-2
to 24.75
kWh m-3
at 60 mA cm-2
(pH 4.5); 10.80 kWh m-3
at 20 mA cm-2
to 31.5 kWh m-3
at 60 mA
cm-2
(pH = 8) (estimated data for volume of treated effluent). On the other hand, in the study
of OA of produced water effluent generated by petrochemical industry, galvanostatic
electrolysis using DDB led to the complete removal of COD (98%), due to large amounts of
hydroxyl radicals and peroxodisulphates generated from the oxidation of water and sulfates in
solution, respectively. Thus, the rate of COD removal increases with increasing applied
current density (15-60 mAcm-2
). Moreover, at Pt electrode, approximately 50% removal of
the organic load was achieved by applying from 15 to 30 mAcm-2 while 80% of COD
removal was achieved for 60 mAcm-2
. Thus, the results obtained in the application of this
technology were satisfactory depending on the electrocatalytic materials and operating
conditions used for removal of organic load (petrochemical and textile effluents) as well as
for the removal of color (in the case of textile effluents). Therefore, the applicability of
electrochemical treatment can be considered as a new alternative like pretreatment or
treatment of effluents derived from textiles and petrochemical industries.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19897 |
| Date | 24 October 2014 |
| Creators | Rocha, J?ssica Horacina Bezerra |
| Contributors | 01139059980, http://lattes.cnpq.br/2485073932883264, Ara?jo, Danyelle Medeiros de, 00974778427, http://lattes.cnpq.br/5376210566183962, Ara?jo, Eliane Gon?alves de, 03363541422, http://lattes.cnpq.br/4720265425355110, Gonzalez, Ricardo Andres Salazar, 00000000000, Fernandes, Nedja Suely, Huitle, Carlos Alberto Martinez |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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