Electrochemical Treatment of Chemical Industry Wastewater Using Steel and Tiruo2 Electrodes

Régis, Gisela; Bidóia, Edério Dino

doi:10.14295/holos.v6i1.199

Cited by 1 publication

(1 citation statement)

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“…Furthermore, toxicological test with Saccharomyces cerevisiae were made according to Régis and Bidoia 24 and Inazaki et al 25 S. cerevisiae cell suspension was exposed to phenolic samples. Test tubes were incubated at 28 ºC for seven days.…”

Section: Toxicity Tests Used Two Different Test Organismsmentioning

confidence: 99%

Analytical methods in photoelectrochemical treatment of phenol

Lopes¹,

Montagnolli²,

Bidóia³

2011

J. Braz. Chem. Soc.

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O presente estudo visou o tratamento de efluente simulado, contendo fenol por processos fotocatalítico e fotolítico com análise toxicológica das soluções fenólicas. Dois sistemas de tratamento foram propostos com radiação UV, eletrodos maciços e potencial elétrico. No primeiro sistema (S1), a concentração de fenol foi determinada por espectrofotometria direta em 269 nm e o segundo (S2) por meio do método fotométrico direto (4-aminoantipirina). Testes de toxicidade foram realizados com dois microrganismos: Escherichia coli e Saccharomyces cerevisiae. Os resultados de S1 demonstraram que conclusões errôneas podem ser retiradas em relação ao aumento de absorbância no pico do fenol de acordo com o tempo de tratamento. Contudo, o método fotométrico direto foi capaz de identificar a redução do fenol em S2 e observou-se que os tratamentos propostos degradaram as moléculas de fenol em solução. Também, no tratamento com fonte ultravioleta de alta energia (UVC), a degradação fenólica deve-se principalmente à fotólise.The aim of the study was to propose a treatment of simulated wastewater containing phenol by photocatalytic and photolytic processes and analyze the toxicity of these phenolic solutions. Two treatment systems were performed with UV radiation, solid electrodes and electric potential. In the first system (S1) phenol concentration was determined by UV direct spectrophotometry (269 nm) and in the second (S2) by direct photometric method (4-aminoantipyrine). Toxicological tests were carried out using two microorganisms: Escherichia coli and Saccharomyces cerevisiae. S1 results showed that erroneous conclusions can be drawn by absorbance values increase at phenol peak. Nevertheless, direct photometric method was able to identify phenol reduction in S2 and the proposed treatments degraded phenol in solution. Also, in treatment using high energy ultraviolet radiation (UVC), the phenol degradation was mainly due to the photolytic process.

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Section: Toxicity Tests Used Two Different Test Organismsmentioning

confidence: 99%