Oil wastes as unconventional substrates for rhamnolipid biosurfactant production by Pseudomonas aeruginosa LBI

Oil wastes were evaluated as alternative low-cost substrates for the production of rhamnolipids by Pseudomonas aeruginosa LBI strain. Wastes obtained from soybean, cottonseed, babassu, palm, and corn oil refinery were tested. The soybean soapstock waste was the best substrate, generating 11.7 g/L of rhamnolipids with a surface tension of 26.9 mN/m, a critical micelle concentration of 51.5 mg/L, and a production yield of 75%. The monorhamnolipid RhaC10C10 predominates when P. aeruginosa LBI was cultivated on hydrophobic substrates, whereas hydrophilic carbon sources form the dirhamnolipid Rha2C10C10 predominantly. © 2005 American Chemical Society and American Institute of Chemical Engineers.

Produção de resíduos sólidos de matérias-primas amiláceas na fabricação de bioetanol para analise de segurança em alimentação de ratos Wistar

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

The influence of floc size and hydraulic detention time on the performance of a dissolved air flotation (DAF) pilot unit in the light of a mathematical model

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

Emergência e crescimento inicial de plântulas de pimenta ornamental e celosia em substrato à base de composto de lodo de curtume

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Avaliação de meios filtrantes primários em filtro contínuo de tambor rotativo a vácuo para lodo de caldo de cana

Este estudo teve o objetivo de avaliar o comportamento de treze tipos de meios filtrantes primários desenvolvidos para uso na filtração a vácuo de lodo de caldo de cana, simulando as operações de formação e desidratação da torta em filtros contínuos de tambor rotativo a vácuo, empregados nas indústrias de açúcar e álcool do Brasil. Para tanto, foi desenvolvida uma planta-piloto anexa ao filtro de tambor rotativo a vácuo, na qual foram realizados todos os ensaios, com o objetivo de refletir a realidade das variáveis operacionais durante uma safra sucroalcooleira. Os resultados são apresentados, comparando-se as taxas de filtração, variando a pressão de formação da torta, temperatura e concentração de auxiliar filtrante, mostrando ao usuário um novo caminho para o melhoramento quantitativo e qualitativo, sem aumentar a área nominal da unidade de filtração.

Characterization of micro-bubble size distribution and flow configuration in DAF contact zone by a non-intrusive image analysis system and tracer tests

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

Método para determinação de distribuição de tamanho de microbolhas (DTMB) em sistemas flotação (FAD) para tratamento de águas utilizando a análise de imagem digital

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

Degradation of sulfamethoxazole in water by solar photo-Fenton. Chemical and toxicological evaluation

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Iridoids from Tocoyena formosa

The leaves of Tocoyena formosa afforded two antifungal iridoids α- and β-gardiol, and the new iridoids, mollugoside methyl ester and formosinoside. Formosinoside was characterized as its hexaacetyl derivative.

Naphthopyranone glycosides from Paepalanthus bromelioides

Two new naphtho[2,3-C]pyran-1-one glycosides, paepalantine-9-O-β-D- glucopyranoside and paepalantine-9-O-β-D-allopyranosyl(1 → 6)glucopyranoside, were isolated from an ethanolic extract of capitula from Paepalanthus bromelioides and identified from their spectrometric data.

Influência de cinco temperaturas de secagem no rendimento e composição do óleo essencial de citronela (Cymbopogon winterianus Jowitt)

The Influence of Drying Temperatures on the Yield Composition of Citronella (Cymbopogon winterianus Jowitt) essential oil. The studies were carried out to establish more precise parameters for citronella (C. winterianus Jowitt) post-harvest, and to optimize drying time and essential oil quantitative/qualitative yield. Five treatments were designed (30°C, 40°C, 50°C, 60°C and 70°C), with 14 repetitions of the drying process and 12 of the essential oil extraction. Drying at 60°C gave the best results for drying time (48 hours until weight stabilization), and also for extracted oil quantity (1.228 ± 0.127% over dry weight). Essential oil content showed high quantitative variations. The main compound found was neral, except in the 50°C treatment, where citronelal was the main compound.

Desenvolvimentos da biopolpação no Brasil

Biopulping is a technology which application can be advantageous to mechanical or chemical pulping. It presents benefits such as the creation of stronger pulp, as well as energy or chemicals savings. This paper gives an overview of the recent efforts to develop biopulping processes in Brazil as well as provides critical information on biopulping development worldwide. Eucalyptus grandis wood chips have been biotreated by Ceriporiopsis subvermispora in a 50-ton biopulping pilot-plant and used to produce TMP and CTMP pulps on a mill scale, Up to 18% and 27% energy savings have been observed for producing 450-470 CSFreeness TMP and CTMP pulps. Despite darker bio-TMP pulps are produced, one-stage bleaching with 5% H2O2 was sufficient to improve brightness values to 70% and 72% for bio-TMP and control pulps, respectively. Understanding biopulping mechanisms is also relevant because more resistant and competitive fungal species could be selected with basis on a function-directed screen-ing project. As far as the chemical changes induced by the fungus in wood are concerned, recent efforts have pointed out for two different types of wood transformations. One of them involves intense lignin depolymerization in short biotreatment periods, while the other indicates that esterification reactions of oxalate secreted by the Jungas on the polysaccharides chains increase the water saturation point of the fibers. Both transformations are expected to affect the fiber-fiber bonding and, consequently, the physical resistance of wood.

Pré-oxidação e adsorção em carvão ativado granular para remoção dos herbicidas Diuron e Hexazinona de água subterrânea

The cultivation of sugarcane demands the use of herbicides such as Diuron and Hexazinone. Some supply wells from Ribeirão Preto, SP, Brazil, built in the Guarani Aquifer are located in recharge points, and the presence of sandy Quartzarenic Neosol in these areas increases the vulnerability of the groundwater to contamination from herbicides This paper reports the water quality monitored in some wells located in the recharge area and the removal of Diuron and Hexazinone by means of adsorption in granular activated carbon (GAC), preceded or not by preoxidation with chlorine and chlorine dioxide in a pilot plant. The results indicated that Diuron was more strongly adsorbed than Hexazinone and that the saturation time of the GAC in the test with preoxidation was shorter than in the test without preoxidation, which may have occurred mainly due to the formation of by-products that competed with the adsorption of the herbicides.