Produção Nacional
The Application of Response Surface Methodology in the Study of Photodegraded Industrial Dairy Effluents by the Photo-Fenton Process: Optimization and Economic Viability
2014; Hindawi Publishing Corporation; Volume: 2014; Linguagem: Inglês
10.1155/2014/967534
ISSN2090-861X
AutoresCarla Cristina Almeida Loures, Hélcio José Izário Filho, Ivy dos Santos Oliveira, Gisella Rossana Lamas Samanamud, André Luiz de Souza, Messias Borges Silva,
Tópico(s)Water-Energy-Food Nexus Studies
ResumoThis study presents results from an application of Photo-Fenton process for organic-load reduction in dairy effluents. Process efficiency was evaluated in terms of percentage dissolved organic carbon, chemical oxygen demand, and biochemical oxygen demand (DOC, COD, and BOD, resp.), whose initial values were 1658 ± 145 mg O 2 L −1 , 9500 ± 500 mg O 2 L −1 , and 2400 ± 100 mg O 2 L −1 , respectively. We applied a statistical design represented by Box-Behnken factorial design inclusive of Fenton's reagent, the power of applied radiation (W), and pH factors. The set temperature value was 30°C with a reaction time of 60 min. The maximum efficiency obtained was at p H = 3.5 , Fenton reagent in the proportion of 35 g H 2 O 2 + 3.6 g Fe 2+ , and ultraviolet radiation potency of 28 W. The results obtained for DOC, COD, and BOD were 81%, 90.7%, and 78.8%, respectively. Regarding the cost/benefit evaluation, the variables and their levels should be the following: pH 3.5, 35.0 g H 2 O 2 /Fe 2+ 3.6 g, and 28 W UV, obtaining a reduction in concentration of 79.5% DOC.
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