Remoção de N-amoniacal em baixas concentrações de oxigênio dissolvido a partir do efluente de frigorífico bovino

This work aimed to develop a biological system for removal of ammonia nitrogen operating at low concentrations of dissolved oxygen. Thus, a biological upflow vertical reactor was built, in which the affluent pass through the support media until the top. Sludge from an anaerobic stabilization pond of a slaughterhouse unit in the city of Presidente Prudente - SP was used as inoculum. Initially the system operated in batch and afterwards in a continuous flow with different HRT. For feeding the reactor, an initial phases was adopted a synthetic culture media, described by Martins (2007), in order to establish the ideal conditions for the development of Anammox bacteria and subsequently, submitted to the system a slugde effluent of slaughterhouse. The results showed significant removal efficiency of N-NH4+, especially in the phase without recirculation of culture media, with an average of 71% removal, with the proportion of removal of N-NH4 +:N-NO2- average 1: 1,69. For the period of operation with effluent from the slaughterhouse, were not obtained satisfactory results, without confirmation of the proliferation of Anammox bacteria in the system, due to the high presences of organic matter in the same confirmed by high concentrations of COD

Produção e caracterização de a-L-arabinofuranosidase de Penicillium janczewskii

A xilana, o segundo principal componente da parede celular vegetal, pertence ao grupo das hemiceluloses, sendo composta por diferentes carboidratos, principalmente xilose e arabinose. Na natureza, devido a sua heterogeneidade estrutural, este complexo polissacarídeo é completamente hidrolisado pela ação sinergística de diferentes enzimas, incluindo xilanases e β-xilosidases, responsáveis pela degradação da sua cadeia principal e outras enzimas chamadas auxiliares ou desramificantes, importantes para remoção dos grupos laterais. Dentre estas últimas, destacam-se as α-L-arabinofuranosidases, enzimas responsáveis pela remoção de resíduos L-arabinofuranosil do polímero. As arabinofuranosidases podem ser produzidas por micro-organismos, como bactérias e fungos, sendo essencialmente enzimas extracelulares. Fungos, especialmente os de solo e madeira, têm sido utilizados para produção de enzimas xilanolíticas, sendo particularmente interessantes do ponto de vista industrial, pelo fato de secretarem suas enzimas diretamente no meio em que se encontram não necessitando de ruptura celular para a liberação das mesmas. Além disso, apresentam níveis de produção mais elevados que os obtidos em culturas bacterianas ou de leveduras. A crescente preocupação com a escassez dos recursos naturais e com a degradação ambiental tem levado à busca por tecnologias mais eficientes, mais competitivas e menos poluentes. Atualmente, muitos processos industriais empregam enzimas microbianas, apresentando inúmeras vantagens em relação às técnicas convencionais. As α-L-arabinofuranosidases podem ser utilizadas individualmente ou em combinação com outras enzimas, representando uma ferramenta promissora para aplicação em diversos processos biotecnológicos como no branqueamento da polpa celulósica, na síntese de oligossacarídeos, na produção de etanol de segunda geração, ou ainda...(Resumo completo, clicar acesso eletrônico abaixo)

Identificação e caracterização de fungos melanizados com potencial de degradação de tolueno

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação da remoção de sulfametoxazol, diclofenaco e 17β-estradiol em água por meio de processo oxidativo com cloro

Pós-graduação em Engenharia Civil - FEIS

Emissões de poluentes em centrais hidrelétricas: aspectos técnicos, econômicos e ecológicos

Pós-graduação em Engenharia Mecânica - FEG

Desenvolvimento de sensores eletroquímicos e métodos de extração em fase sólida baseados em sistemas biomiméticos para análise de poluentes ambientais

Pós-graduação em Química - IQ

Cirurgia estética para remoção de hiperplasia gengiva: granuloma piogênico

The pyogenic granuloma, a lesion considered hyperplastic regenerative inflammatory reaction is a finding commonly found in the oral cavity, affecting large numbers of individuals, being more prevalent in females. But its pathogenesis is not well defined and may be associated with numerous factors that stimulate tissue proliferation. Correct diagnosis and treatment plan are essential for success in approach, restoring function and aesthetics to the periodontal tissues. In agreement with the literature, the most common treatment and greater predictability is surgical removal, which involves resection of the lesion, together with its base inserted into the underlying tissue, periosteum and bone tissue. However, the excision can promote aesthetic defects, particularly in anterior regions where it is most affected. This article reports on the importance of a correct surgical approach for removal of pyogenic granuloma in the region of the interdental papilla between teeth 42 and 43, resulting in a good anatomical result and aesthetic.

Avaliação da remoção de sulfametoxazol, diclofenaco e 17β-estradiol em águas por adsorção em carvão ativado granular

Pós-graduação em Engenharia Civil - FEIS

Bombeamento e tratamento da fase livre em Aquífero Litorâneo

High fuel consumption and its inadequate control in fuel stations caused the pollution of soil and aquifers. These consequences created more concern with the increased exploration of aquifers to supply the groundwater demand. The objective of this study was to evaluate the eficiency and efectiveness of the of pump and treat technique of the water applied to the Coastal Aquifer in the cleaning up of the plumes produced by the leaking of fuel in the gas station Auto Posto Baía do Sol Ltda. The gas station is located in São Sebastião, in the north coast of São Paulo State. In the case of Auto Posto Baía do Sol Ltda., the technique of pump and treat was eficient and the plume produced by the leakage was completely removed. However, the efectiveness of this technique was low due to the long time required for the complete operation.

Caracterização térmica e físico-química do sistema argila-8-hidroxiquinolina na remoção de íons Fe(III), Ni(II) e Co(II)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo comparativo in vitro da resistência à remoção de grampos circunferenciais aplicados sobre dentes íntegros e restaurados com resina composta

An experimental study was undertaken in arder to find out lhe behavior of the required force to yield dislodgement of circumierential clasps of removable partial dentures ou two groups of samples. 1 with retentive terminais engaging and acting ou enamel 2 with retentive terminais engaging on enamel and acting on composite resm With this aim a device was designed based on a sewing machine (brand name Elgin) that could repeatedly simulate lhe introduction-removal movement of circunferencial clasps ou the samples. ln addiction the device had a platform to sustain the samples and permit measurements, a cycle counter and a dynamometer. The samples were constructed by inclusion in dental stone of extracted natural molar teeth whose retentive areas were ou natural enamel or composite resin addictions.The clasps were fabricated from wax ups of resin and wax and were cast with chromium cobalt alloy. The composite resin used was one of the last generation, monomodal type, photopolymerized and binded to the enamel by the acid etching technique. Tests were carried out in aqueous enviroment. Is was established a maximum of 5.000 cycles for each of the samples. Observatins were made from 100 to 100 cycles until 2.000 and from 200 to 200 cycles to 5.000. Results showed that variations in the amount of the required force for dislodgement of the clasps from the samples during the test periods had no significancy eather to those with retentive areas on the enamel or to those with retentive fabricated with addictions of composite resin

Utilização de turfa para remoção de metais potencialmente tóxicos de uma empresa recicladora de plásticos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Poluentes orgânicos persistentes em ar interior: desenvolvimento de método de extração em adsorvente para amostragem ativa

Persistent Organic Pollutants (POPs) are chemical substances extraordinarily toxic and persistent in the environment. Due to these properties, POPs are targets of the Stockholm Convention which aims to provide means to eliminate production and use by encouraging the reduction and, where possible, eliminating the release of these contaminants to the environment. One of the articles of this _Convention aims to assess the basal levels of such substances in the environment to monitor both the reduction of release to the environment, and to assess human exposure, using analyzes of milk and air for example. Although efforts to control POPs production and release to the environment have been made, data about their levels in Brazil are still scarce, mainly in the atmosphere or indoor environment. Considering the permanence of people inside its house, this study presents a method for POP extraction from XAD-2 sorbent employed in indoor air sampling, with identification and quantification by GC-ECD. GC-ECD linear range of the studied analytes, congeners of polychlorinated biphenyls (PCB) (28, 52, 101, 118, 138, 153 and 180), DDTs and their metabolites (DDDs, DDEs) and endosullan (isomers c - and 13 - and metabolite endosulfan sulfate) ranged between 0.5 and 16.0 ng mL-I with r2 > 0.967. The method developing consist of selecting the extraction solvent system by agitation (90 rpm, 1 hour) with n-hexan,e (2 mL) or n-hexane:acetone (1:1, v/v) (2 mL), concentration the extract with a gentle N2 stream, and evaluation of breakthrough with passage or air through the fortified XAD-2 cartridge before extraction, employing a low volume air suction pump (Pump Model 224 universal-PCXR8; 5-5000 mL min-1, SKC Inc., Eighty Four, PA, USA), Calibrator Dry-Cal DC-Lite (BIOS, Butler, NJ, USA)). Two fortification levels were employed, 15 and 30 ng. After selecting n-hexane as extraction solvent, with accuracy and precision ranging...

Materiais derivados de hidróxidos duplos lamelares: síntese, caracterização e aplicação em adsorção e processos avançados de oxidação

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