Advanced oxidation processes applied to tannery wastewater containing Direct Black 38—Elimination and degradation kinetics

Sauer, Ticiane Pokrywiecki; Casaril, Leonardo; Oberziner, André L. B.; José, Humberto Jorge; Moreira, Regina de Fátima Peralta Muniz

doi:10.1016/j.jhazmat.2005.11.063

Cited by 83 publications

(37 citation statements)

References 25 publications

(31 reference statements)

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“…The effect of pH therefore needs to be analysed in terms not only of the degradation of initial pollutants, but also of the compounds produced during treatment by determining global parameters such as TOC or COD [5]. In addition, previous studies [38] have demonstrated that faster photocatalytic degradation of a tannery wastewater can be achieved at low pH. The influence of pH on process efficiency was therefore studied first, working at as-received wastewater pH (pH=7.3) and acidic (pH=2.5) conditions.…”

Section: Wastewater Testing With the Designed Photoreactorsupporting

confidence: 85%

“…It can be observed that a degradation effect associated with photolysis (UV irradiation) occurred in both tested pHs. Moreover, as also reported in the literature, it was confirmed that degradation of the organic compounds by both photolysis and photocatalysis was higher at acidic pH [38]. This behaviour can be related to the effect of pH on the adsorption of the initial or generated organic compounds on the titania surface during UV treatment.…”

Section: Wastewater Testing With the Designed Photoreactormentioning

confidence: 99%

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Application of plasma-sprayed TiO2 coatings for industrial (tannery) wastewater treatment

Bordes

Vicent

Moreno

et al. 2015

Ceramics International

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Fine-structured photocatalytic TiO 2 coatings were deposited by atmospheric plasma spraying (APS) on austenitic stainless steel coupons. One commercial spray-dried nanostructured TiO 2 powder and five spray-dried powders obtained from suspensions containing mixtures of submicrometric and nanometric TiO 2 particles were used as feedstock materials. Coating microstructure and phase composition were characterised using FEG-SEM and XRD techniques. The photocatalytic activity of the coatings was determined by measuring the degradation of methylene blue dye in aqueous solution.The experimental data were observed to follow a pseudo-first-order kinetic. The kinetic constants displayed a clear relationship with coating anatase content. 2The photocatalytic decontamination capability of one of these APS coatings was subsequently investigated by treating an industrial tannery wastewater. The photocatalytic experiments with these TiO 2 coated coupons were carried out in a selfdesigned reactor. Partial degradation of the pollutants was observed, owing to a decrease in Total Organic Carbon (TOC), in addition to a significant decolouration effect, mainly relating to the removal of aromatic organic compounds typically present in tannery wastewater. The results demonstrate the potential use of plasma-sprayed photocatalytic TiO 2 coatings in tannery wastewater treatment.

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Section: Wastewater Testing With the Designed Photoreactorsupporting

confidence: 85%

Section: Wastewater Testing With the Designed Photoreactormentioning

confidence: 99%

Application of plasma-sprayed TiO2 coatings for industrial (tannery) wastewater treatment

Bordes

Vicent

Moreno

et al. 2015

Ceramics International

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“…Recent studies have looked at the effectiveness of UV/H 2 O 2 to treat tannery waste streams as well as herbicides (Sauer et al, 2006;Bobu et al, 2006). The use of UV/H 2 O 2 to treat NACs was studied and it was determined that an optimum concentration of H 2 O 2 was necessary to ensure that the reaction is efficient (Einschlag et al, 2002).…”

Section: Ultraviolet Light With Hydrogen Peroxidementioning

confidence: 99%

“…UV/TiO 2 has been used to treat many wastes including dyes, hexavalent chromium, tannery wastes, and acetone (Mahmoodi et al, 2006;Xu et al, 2006;Sauer et al, 2006;Ku et al, 2005). A study was conducted to test the ability of UV/TiO 2 to remediate TNT.…”

Section: Ultraviolet Light With Titanium Dioxidementioning

confidence: 99%

Single-step treatment of 2,4-dinitrotoluene via zero-valent metal reduction and chemical oxidation

Thomas

Hernández

Kuo

2008

Journal of Hazardous Materials

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Many nitroaromatic compounds (NACs) are considered toxic and potential carcinogens. The purpose of this study was to develop an integrated reductive/oxidative process for treating NAC contaminated waters. The process consists of the combination of zero-valent manganese or iron and a hydroxyl radical based treatment technique.Corrosion promoters were added to the contaminated water to minimize passivation of the metallic species. Water contaminated with 2,4-dinitrotoluen (DNT) was treated with the integrated process using a recirculating batch reactor. It was demonstrated that addition of corrosion promoters to the contaminated water enhanced the rate of reaction of 2,4-DNT with zero-valent iron or manganese. Results showed that iron provided greater reduction of 2,4-DNT than manganese. Chemical oxidation was used to mineralize the reduction products. The degree of mineralization was measured analyzing the samples for total organic carbon and nitrates. A proposed reaction and corrosion mechanisms and rate expressions were developed during the course of the study.ii DEDICATION This thesis is dedicated to the memory of my late grandmother, Emily Thomas.Her amazing will and determination was seconded only by the love she had for her family. You are missed Nanny, I love you. I would like to thank my colleagues,

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“…Os métodos oxidativos avançados incluem processos como UV/H 2 O 2 , TiO 2 /UV, Eletro--Fenton, Fenton e foto-Fenton (Vandevivere et al 1998;Sauer et al 2006;Schrank et al 2004;Gozzo 2005e Borba 2010. Estes processos são, em geral, baseados na formação do radical OH que atua oxidando os poluentes orgânicos a CO 2 , H 2 O e íons inorgânicos.…”

Section: Introductionunclassified

Estudo Da Toxicidade De Efluente Têxtil Tratado Por Foto-Fenton Artificial Utilizando as Espécies Lactuca Sativa E Artemia Salina

et al. 2012

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Resumo: Este trabalho apresenta a análise da toxicidade de efluente têxtil tratado por processo fotoFenton com irradiação artificial, utilizando alface (Lactuca sativa) e micro-crustáceos (Artemia salina) como organismos-teste. Foram retiradas alíquotas do efluente nos tempos de tratamento de 0, 5, 10, 15, 45, 60 e 90 minutos para análise da toxicidade, demanda química de oxigênio (DQO), cor e turbidez. Durante o experimento de toxicidade determinou-se a inibição do crescimento das raízes e radículas da alface, o efeito sobre a germinação das sementes e o efeito sobre a mortalidade dos micro-crustáceos, além da concentração letal (DL 50 ) para cada espécie. Analisando os resultados obtidos, verificou-se que o tratamento foto-Fenton artificial não reduziu a toxicidade do efluente têxtil; entretanto, na DQO, cor e turbidez, obtiveram-se reduções acima de 90% nos primeiros 45 minutos de irradiação. Palavras-chave:Bioensaio, Efluente Têxtil, Foto-Fenton. Abstract:In this paper, the toxicity of textile wastewater, treated by photo-Fenton process with artificial irradiation using lettuce (Lactuca sativa) and brine shrimp (Artemia Salina) as test organisms was analyzed. Effluent aliquots were taken at the treatment times of 0, 5, 10, 15, 45, 60 and 90 minutes for toxicity, chemical oxygen demand (COD), color and turbidity analysis. During the toxicity experiment were determined the inhibition of growth of lettuce roots and rootlets, the effect on seed germination and the effect on mortality of brine shrimp, beyond the lethal concentration (LD 50 ) for each species. Analyzing the results, was observed that photo-Fenton treatment with artificial UV irradiation did not reduced the textile effluent toxicity; however, COD, color and turbidity reductions above 90% were observed in the first 45min of irradiation.

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Advanced oxidation processes applied to tannery wastewater containing Direct Black 38—Elimination and degradation kinetics

Cited by 83 publications

References 25 publications

Application of plasma-sprayed TiO2 coatings for industrial (tannery) wastewater treatment

Application of plasma-sprayed TiO2 coatings for industrial (tannery) wastewater treatment

Single-step treatment of 2,4-dinitrotoluene via zero-valent metal reduction and chemical oxidation

Estudo Da Toxicidade De Efluente Têxtil Tratado Por Foto-Fenton Artificial Utilizando as Espécies Lactuca Sativa E Artemia Salina

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