Investigação da mutagenicidade do azocorante comercial BDCP (Black Dye Commercial Product), antes e após tratamento microbiano, utilizando o sistema teste de Allium cepa

Pós-graduação em Ciências Biológicas (Biologia Celular e Molecular) - IBRC

Comparative study of toxicity of azo dye Procion Red MX-5B following biosorption and biodegradation treatments with the fungi Aspergillus niger and Aspergillus terreus

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Potential of a bacterial consortium to degrade azo dye Disperse Red 1 in a pilot scale anaerobic-aerobic reactor

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Electrolysis applied for simulated textile effluents degradation containing acid red 151 and acid blue 40

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

The azo dye Disperse Red 13 and its oxidation and reduction products showed mutagenic potential

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Surfactants and their aerobic degradation products

Die Ziele der vorliegenden Arbeit waren 1) die Entwicklung und Validierung von sensitiven und substanz-spezifischen Methoden für die quantitative Bestimmung von anionischen, nichtionischen und amphoteren Tensiden und deren Metaboliten in wässrigen Umweltproben unter Einsatz leistungsfähiger, massenspektrometrischer Analysengeräte,2) die Gewinnung von aeroben, polaren Abbauprodukten aus Tensiden in einem die realen Umweltbedingungen simulierenden Labor-Festbettbioreaktor (FBBR), dessen Biozönose oberflächenwasserbürtig war,3) zur Aufklärung des Abbaumechanismus von Tensiden neue, in 2) gewonnene Metabolite zu identifizieren und massenspektrometrisch zu charakterisieren ebenso wie den Primärabbau und den weiteren Abbau zu verfolgen,4) durch quantitative Untersuchungen von Tensiden und deren Abbauprodukten in Abwasser und Oberflächenwasser Informationen zu ihrem Eintrag und Verhalten bei unterschiedlichen hydrologischen und klimatischen Bedingungen zu erhalten,5) das Verhalten von persistenten Tensidmetaboliten in Wasserwerken, die belastetes Oberflächenwasser aufbereiten, zu untersuchen und deren Vorkommen im Trinkwasser zu bestimmen,6) mögliche Schadwirkungen von neu entdeckten Metabolite mittels ökotoxikologischer Biotests abzuschätzen,7) durch Vergleich der Felddaten mit den Ergebnissen der Laborversuche die Umweltrelevanz der Abbaustudien zu belegen. Die Auswahl der untersuchten Verbindungen erfolgte unter Berücksichtigung ihres Produktionsvolumens und der Neuheit auf dem Tensidmarkt. Sie umfasste die Waschmittelinhaltsstoffe lineare Alkylbenzol-sulfonate (LAS), welches das Tensid mit der höchsten Produktionsmenge darstellte, die beiden nichtionischen Tenside Alkylglucamide (AG) und Alkylpolyglucoside (APG), ebenso wie das amphotere Tensid Cocamidopropylbetain (CAPB). Außerdem wurde der polymere Farbübertragungsinhibitor Polyvinylpyrrolidon (PVP) untersucht.

Characterization and performance of carbonaceous materials obtained from exhausted sludges for the anaerobic biodecolorization of the azo dye Acid Orange II.

This work presents the preliminary study of new carbonaceous materials (CMs) obtained from exhausted sludge, their use in the heterogeneous anaerobic process of biodecolorization of azo dyes and the comparison of their performance with one commercial active carbon. The preparation of carbonaceous materials was conducted through chemical activation and carbonization. Chemical activation was carried out through impregnation of sludge-exhausted materials with ZnCl2 and the activation by means of carbonization at different temperatures (400, 600 and 800°C). Their physicochemical and surface characteristics were also investigated. Sludge based carbonaceous (SBC) materials SBC400, SBC600 and SBC800 present values of 13.0, 111.3 and 202.0m(2)/g of surface area. Biodecolorization levels of 76% were achieved for SBC600 and 86% for SBC800 at space time (τ) of 1.0min, similar to that obtained with commercial activated carbons in the continuous anaerobic up-flow packed bed reactor (UPBR). The experimental data fit well to the first order kinetic model and equilibrium data are well represented by the Langmuir isotherm model. Carbonaceous materials show high level of biodecolorization even at very short space times. Results indicate that carbonaceous materials prepared from sludge-exhausted materials have outstanding textural properties and significant degradation capacity for treating textile effluents.

A novel laponite clay-based Fe nanocomposite and its photo-catalytic activity in photo-assisted degradation of Orange II

A novel laponite RD clay-based Fe nanocomposite (Fe-Lap-RD) has been successfully synthesized through a reaction between a solution of iron salt and an aqueous dispersion of laponite RD clay. The X-ray diffraction (XRD) results reveal that the Fe-Lap-RD mainly consists of Fe2O3 (maghemite) and Fe2Si4O10(OH)2 (iron silicate hydroxide), which have tetragonal and monoclinic structures, respectively, and has a high specific surface area as well as a high pore volume. The photo-catalytic activity of the Fe-Lap-RD was examined in the photo-assisted degradation of an organic azo dye Orange II. It was found that the mineralization of Orange 11 undergoes a slower kinetics than discoloration, and 70% total organic carbon (TOC) of 0.2 mM Orange 11 can be removed in 90 min, implying that the Fe-Lap-RD exhibited a high photo-catalytic activity in the presence of H2O2 and UV light (254 nm) in the photo-assisted degradation of Orange II. In addition, our experiments also illustrate that the Fe-Lap-RD has a long-term stability but is of low cost. This study illustrates the possibility of photo-assisted degradation of organic compounds without the requirements to remove the Fe ions after reaction. Two possible catalytic reaction mechanisms are also proposed. (C) 2003 Elsevier Science Ltd. All rights reserved.