Degradação de benzeno, tolueno e xilenos em águas contaminadas por gasolina, utilizando-se processos foto-Fenton

Tiburtius, Elaine Regina Lopes; Peralta‐Zamora, Patricio; Emmel, Alexandre

doi:10.1590/s0100-40422009000800014

Cited by 11 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Satisfactory reductions of lignin compounds and total phenolics can be attributed to aromatic content in the start of the process; above those occur the electrophilic addition of hydroxyl radicals, generating new phenols in the media. Once the oxidative process continues, these formed compounds undergo the breakdown of the aromatic rings, lose their chromophoric groups and afterwards would mineralize (Tiburtius et al, 2009;Kamali and Khodaparast, 2015). Theses results indicate that higher H2O2 doses should be implemented to mineralize of the organic compounds.…”

Section: Effluent Treatment By Uv/h2o2 Processmentioning

confidence: 96%

Acute ecotoxicity on Daphnia magna to evaluate effluent samples of Kraft pulp mill treated by UV/H2O2 process

Micheletto¹,

Sampaio²,

Ruiz³

et al. 2019

Rev. ambiente água

View full text Add to dashboard Cite

The pulp and paper industry is one of world’s largest water consumers, generating high volumes of effluents. The Kraft process produces effluents with high BOD, COD, suspended solids, lignin and a myriad of potentially toxic compounds, which require treatment before discharge into the aquatic environment. Advanced oxidation processes, such as UV/H2O2, have been applied as treatment alternatives because they can destroy many compounds before they mineralize. However, when the oxidation process is incomplete, occurs could be produced by products with high toxicity. This study evaluated the acute toxicity on Daphnia magna of two effluent samples of Kraft pulp mill (KE1 and KE2) treated by UV/H2O2 process. The effects of the pH variation and oxidant concentration on the removal of DOC, total UV-vis spectral area and apparent color were considered to adjust the experiments’ conditions with diluted effluent KE1. Both samples were treated at pH 4.0 and 70 mg L-1 of H2O2 for 40 min, achieving removals of up to 69.4% in apparent color, 73.7% of phenolic compounds and 68.9% of lignin compounds. When the reaction was applied in undiluted effluent samples, the acute toxicity for Daphnia magna decreased for KE1 after 780 min of treatment, whereas KE2 became four times more toxic. The data showed that although the treatment had been efficient considering physics and chemicals parameters, it is necessary follow the oxidative processes with ecotoxicological bioassays to guarantee their safety, since different effluents of the Kraft pulp mill could present different levels of organic compound mineralization.

show abstract

Section: Effluent Treatment By Uv/h2o2 Processmentioning

confidence: 96%

Acute ecotoxicity on Daphnia magna to evaluate effluent samples of Kraft pulp mill treated by UV/H2O2 process

Micheletto¹,

Sampaio²,

Ruiz³

et al. 2019

Rev. ambiente água

View full text Add to dashboard Cite

show abstract

“…According to Tiburtius et al (2009) this reagent is consumed in a short period of time and it is not advisable to add the whole concentration at once. In this way, the concentration of 600 mg‧L -1 was fixed and the degradation of the pharmaceuticals analyzed for 60 minutes, substituting the single addition of hydrogen peroxide for a fractional addition at the times of 0, 10 and 20 minutes.…”

Section: Degradation Of the Pharmaceuticals Using Advanced Oxidation Processesmentioning

confidence: 99%

Degradation of the pharmaceuticals lamivudine and zidovudine using advanced oxidation processes

Lucena

Napoleão

Silva

et al. 2020

CeN

View full text Add to dashboard Cite

The existence of pharmaceuticals in nature is a growing environmental problem, turning necessary the use of efficient treatments for the degradation of these substances, as the advanced oxidation processes (AOPs). In this work the AOPs UV/H2O2 and photo-Fenton were applied to degrade the pharmaceuticals lamivudine and zidovudine in an aqueous solution using a bench reactor, composed of three UV-C lamps. It was verified that the UV/H2O2 process presented a degradation of 97.33 ± 0.14% for lamivudine and 93.90 ± 0.33% for zidovudine, after 180 min of treatment and for an initial concentratin of each pharmaceutical of 5 mg.L-1 and [H2O2] of 600 mg.L-1. A methodology by artificial neural networks (ANNs) was used to model the photocatalytic process, with the MLP 7-23-2 ANN representing it well, and determining the relative importance (%) of each of the input variables for the pharmaceutical’s degradation process. Kinetic studies for the pharmaceutical degradation and the conversion of organic matter showed good adjustments to the pseudo first-order models with R2 raging from 0.9705 to 0.9980. Toxicity assays for the before treatment solution indicated that the seeds Lactuca sativa and Portulaca grandiflora showed growth inhibition whereas the post-treatment solution inhibited only the growth of Lactuca sativa.

show abstract

“…A degradação do paracetamol através do processo foto-Fenton e ação UV/H2O2, foi avaliada após exposição do fármaco à radiação UV-C em reator de bancada com emissão de fótons igual a 1,48 mW.cm -2 , intensidade essa inferior a relatada por Tiburtius et al (2009) em seus estudos (3,0 mW.cm -2 ), contudo capaz de promover a degradação do composto de interesse, conforme pode ser observado a seguir. O fármaco foi quantificado após extração líquido-líquido (ELL) com diclorometano e concentração em rota-evaporador da solução aquosa preparada com concentração igual a 1mg.L -1 conforme descrito na metodologia.…”

Section: Degradação Do Paracetamolunclassified

Degradação do contaminante emergente paracetamol empregando processos oxidativos avançados

Napoleão

Zaidan

Salgado

et al. 2015

REGET

View full text Add to dashboard Cite

Uma classe de poluentes tem sido investigada por pesquisadores de todo o mundo, estes são os contaminantes emergentes, que são considerados persistente e refratário. Estes compostos estão presentes em diferentes matrizes ambientais em baixas concentrações que requerem tratamentos alternativos de polimento capazes de promover a degradação destes poluentes, uma vez que os tratamentos convencionais não são capazes de removê-los. Este estudo avaliou a degradação do paracetamol utilizando processos oxidativos avançados (ação UV/H2O2 e foto-Fenton). Os resultados mostraram que o processo ação UV / H2O2 foi mais eficiente conseguindo promover a degradação de 99% do paracetamol, o que é corroborado pela estatística que mostraram que as experiências isentas da adição de ferro (UV / H2O2) foram os mais eficientes na degradação do paracetamol em solução aquosa solução. A metodologia para a identificação através de cromatografia foi validado de acordo exigência das agências existentes (INMETRO e ANVISA), assegurando a confiabilidade dos resultados.

show abstract

Degradação de benzeno, tolueno e xilenos em águas contaminadas por gasolina, utilizando-se processos foto-Fenton

Cited by 11 publications

References 23 publications

Acute ecotoxicity on Daphnia magna to evaluate effluent samples of Kraft pulp mill treated by UV/H2O2 process

Acute ecotoxicity on Daphnia magna to evaluate effluent samples of Kraft pulp mill treated by UV/H2O2 process

Degradation of the pharmaceuticals lamivudine and zidovudine using advanced oxidation processes

Degradação do contaminante emergente paracetamol empregando processos oxidativos avançados

Contact Info

Product

Resources

About