CT - DEQ - Artigos publicados em periódicos

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Acid leaching and thermal treatments in the obtaining of mixed oxides of Nb and Ta from ferrocolumbite
(Elsevier, 2020-03-01) Oliveira, Tiago Fernandes; Souza, Carlson Pereira de; Moriyama, André Luis Lopes
In this paper, the study of an acid and thermal treatment in a mixture of niobium and tantalum oxides obtained from columbite mineral was performed. Initially, the mineral was physically prepared by milling and sifting, followed by characterization by X-ray diffraction (XRD), X-ray fluorescence (XRF) and Scanning Electron Microscope (SEM). Subsequently, the mineral performed an acid leaching in order to remove iron and manganese present in its composition. A second acid leaching was necessary to eliminate the persistent cassiterite impurity by precipitation of Nb and Ta hydrated oxides. These oxides were characterized by XRF, XRD and SEM. Then the oxides were calcined at 800 °C, 900 °C and 1000 °C at different heating rates and calcination times to study their crystallization. The mixed oxides were characterized by XRF, XRD, SEM and nitrogen adsorption (BET method). The influence of heating rate was verified at 800 °C. An increase in crystal size was observed when the rate was reduced from 10 °C.min−1 to 5 °C.min−1. Greater crystallinity and formation of peaks related to the change of phase from hexagonal to orthorhombic were observed when the temperature was raised from 800 °C to 900 °C. At the temperature of 1000 °C, intermediate and low peaks related to formation of monoclinic phase of niobium pentoxide were observed. The change in calcination time from 5 h to 10 h at 1000 °C caused reduction in Nb2O5 to NbO2 and a decrease in crystal size and hence an increase in the surface area. The oxides heated at 900 °C showed the largest surface area
Acidification kinetics, physicochemical properties and sensory attributes of yoghurts prepared from mixtures of goat and buffalo milks
(Wiley, 2012-04) Souza, Domingos Fabiano de Santana; Bezerra, Maria F.; Correia, Roberta T. P.
Five formulations of set-type yoghurt were produced using different caprine–bubaline milk ratios. They were investigated in regard to the acidification kinetics, yoghurt composition, rheology and sensory attributes. The acidification profile of all five experimental groups was similar, but the maximum acidification rate was higher for yoghurts of milk mixtures. The addition of buffalo milk increased total solids, fat and overall acceptance of yoghurt, besides decreasing synaeresis. Yoghurts made from caprine–bubaline milk mixtures reached good sensory scores and yoghurt prepared with 30% of goat milk and 70% of bubaline milk received the best sensory scores
Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds – Part II: C18 fatty acids
(Elsevier, 2013-05) Chiavone Filho, Osvaldo; Belting, Patrícia Castro; Rarey, Jürgen; Gmehling, Jürgen; Ceriani, Roberta; Meirelles, Antonio José de Almeida
In this work, activity coefficients at infinite dilution (c113) have been measured for 21 solutes (subscript 1) (alkanes, cycloalkanes, alkenes, aromatic compounds, alcohols, esters, ketones, and halogenated hydro carbons), in four solvents (subscript 3), namely one saturated fatty acid and three unsaturated fatty acids: stearic (octadecanoic) acid – C18:0, oleic (cis-9-octadecenoic) acid – C18:1 9c, linoleic (cis,cis-9,12- octadecadienoic) acid – C18:2 9c12c, and linolenic (cis,cis,cis-9,12,15-octadecatrienoic) acid – C18:3 9c12c15c, by gas–liquid chromatography. The measurements were carried out at temperatures from (303.13 to 368.19) K and the partial molar excess Gibbs free energy (DGE;11 ), enthalpy (DHE;11 ), and entropy (DSE;11 ), at infinite dilution were calculated from experimental c113 values obtained over the tem- perature range. The uncertainties in determination of c113 and DHE;11 are 4% and 20%, respectively. The results for stearic acid obtained in this study have been compared to those available in the Dortmund Data Bank (DDB). The real behaviour of fatty systems could be better understood through the results obtained in this work
Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds: Saturated fatty acids
(Elsevier, 2012-12) Chiavone Filho, Osvaldo; Belting, Patrícia Castro; Rarey, Jürgen; Gmehling, Jürgen; Ceriani, Roberta; Meirelles, Antonio José de Almeida
The activity coefficients at infinite dilution , c113 (the subscript 1 and 3 correspond to solute and solvent, respectively), for 21 solutes, including alkane, cycloalkane, alkene, aromatic compounds, alcohol, ester, ketone, and halogenated hydrocarbons, in four solvents, that are the saturated fatty acids: capric (decanoic) acid, lauric (dodecanoic) acid, myristic (tetradecanoic) acid, and palmitic (hexadecanoic) acid, were determined by gas–liquid chromatography at temperatures from 314.10 K to 358.33 K. Comparison with previously published for selected solutes in palmitic (hexadecanoic) acid were also performed. The values of the partial molar excess Gibbs free energy, DG113, enthalpy, DH113, and entropy, DS113, at infinite dilution were calculated from experimental c113 values obtained over the temperature range. Results obtained in this work allow a more accurate description of the real behavior of fatty systems
Adsorção de Cu2+ e Cr3+ em efluentes líquidos utilizando a cinza do bagaço da cana-de-açúcar
(Associação Brasileira de Cerâmica - ABCeram, 2015) Melo, Marcus Antônio de Freitas; Ferreira, P. P. L.; Braga, Renata Martins; Teodoro, N. M. A.; Melo, Vítor Rodrigo de Melo e; Melo, Dulce Maria de Araújo
Os efluentes líquidos de algumas indústrias apresentam traços de metais nocivos que possuem propriedade bioacumulativa, o que contribui para o aumento de sua toxicidade. Tendo em vista o crescimento industrial, e o consequente aumento de emissões de contaminantes em efluentes líquidos, a adsorção está entre as operações aplicadas para diminuir as concentrações dos metais a fim de atender a regulamentação ambiental vigente. A biomassa residual vem ganhando destaque no tratamento desses efluentes por se um material renovável e de baixo custo, quando comparado com os adsorventes convencionais. O objetivo deste trabalho é avaliar a eficiência da cinza do bagaço da cana-de-açúcar (CBC) na adsorção dos íons metálicos Cu2+ e Cr3+ por meio de ensaios de isoterma de adsorção. A CBC foi caracterizada quanto a sua microestrutura, composição química, área de superfície específica e morfologia, e o adsorbato foi analisado por absorção atômica de chama. A CBC apresentou-se de maneira eficaz como um bioadsorvente para ambas as soluções sintéticas, contendo os íons Cu2+ e Cr3+, presentes nos efluentes líquidos. As isotermas de adsorção presentaram um perfil crescente, indicando a eficiência na remoção média de 97,3% para o Cr3+ e 96,4% para o Cu2+, podendo este material ser aplicado como adsorvente em efluentes industriais
Adsorption of chromium ions on oil shale waste
(Brazilian Journal Of Petroleum And Gas, 2011) Melo, Marcus Antônio de Freitas; Pimentel, Patrícia Mendonça; Oliveira, Rosane Maria Pessoa Betânio; Melo, Dulce Maria de Araújo; Assunção, Ary Leonídio do Carmo; Gonzales, Gaspar
The adsorption of chromium (III) ions onto retorted shale, a waste product of the pyrolysis of oil shale, was investigated as a function of initial pH, temperature, and initial metal ion concentration. Adsorption experiments were carried out in a batch system and the uptake of the metallic ion was studied by using an initial concentration range of 200-500 mg L-1. The pseudo-first and pseudo-second order models were used to predict the rate constants of the adsorption system. Both Langmuir and Freundlich models were used to fit the equilibrium data; however, the former resulted in best fitting. Thermodynamic parameters such as enthalpy, free energy, and entropy changes were calculated. The values of such parameters showed that Cr(III) adsorption was favored at high temperatures
Adsorption of crude oil on anhydrous and hydrophobized vermiculite
(Elsevier, 2003-04-15) Melo, Marcus Antônio de Freitas; Farias, Robson Fernandes de; Silva Júnior, Umberto Gomes da; Silva, Adaı́lton F. da
This publication reports the adsorption of crude oil on vermiculite samples, expanded and hydrophobized with carnauba (CoperníciaCerífera) wax. The adsorption studies were performed by using columns filled with the vermiculite matrices and by dispersion of the vermic-ulite samples in an oil–water (50 ppm of oil) emulsion. The hydrate vermiculite exhibits a very low adsorption capacity against crude oil. Onthe other hand, anhydrous (expanded) and hydrophobized matrices show a high adsorption capacity. The 10% hydrophobized matrix show a50% increased adsorption capacity, in comparison with the expanded one. For adsorption performed in the water–oil emulsion, saturation ofthe solid hydrophobized matrix is achieved after 60 min. The hydrophobized samples exhibit adsorption factors in the 0.7–1.0 range
Adsorption of nonionic surfactants in sandstones
(ELSEVIER, 2007-02-01) Curbelo, Fabiola Dias da Silva; Santanna, Vanessa Cristina; Barros Neto, Eduardo Lins de; Dutra Júnior, Tarcílio Viana; Dantas, Tereza Neuma de Castro; Dantas Neto, Afonso Avelino; Garnica, Alfredo I.C.
Adsorption of surfactants from aqueous solutions in porous media is very important in enhanced oil recovery (EOR) of oil reservoirs because surfactant loss due to adsorption on the reservoir rocks impairs the effectiveness of the chemical slurry injected to reduce the oil–water interfacial tension (IFT) and renders the process economically unfeasible. In this paper, two nonionic surfactants with different ethoxylation degrees were studied, ENP95 with ethoxylation degree 9.5 and ENP150 with ethoxylation degree 15. The experiments were carried out in a surfactant flooding apparatus, with a pressure gradient of 30 psi. The concentration of the injected solutions were 30% above the critical micelle concentration, to assure micelle formation. The results from the flow experiments of surfactant solutions in porous media showed that the adsorption extent was higher for ENP95 than for ENP150 because the previous surfactant has a smaller ethoxylation degree, that is, a smaller polar part
Advanced oxidation processes and their application in the petroleum industry: a review
(Brazilian Journal of Petroleum and Gas, 2008) Chiavone Filho, Osvaldo; Mota, André Luis Novais; Albuquerque, Liana Filgueira; Beltrame, Leocádia Terezinha Cordeiro; Machulek Júnior, Amilcar; Nascimento, Cláudio Augusto Oller do
Advanced oxidation processes (AOP) are technologies based on the generation of highly reactive species, the hydroxyl radicals, used in oxidative degradation procedures for organic compounds dissolved or dispersed in aquatic media. These processes are promising alternatives for decontamination of media containing dissolved recalcitrant organic substances, which would not be efficiently removed by conventional methods. The present paper describes a series of AOP, analyzing the aspects related to each type of process, such as the interference of external agents and the ideal operating conditions, based on the analysis and comparison of different studies in the area. In addition, several applied AOP studies on treatment of oil wastewater and on remediation of soil contaminated with oil or its derivatives are presented
Alcoholic fermentation of Saccharomyces cerevisiae, Pichia stipitis and Zymomonas mobilis in the presence of inhibitory compounds and seawater
(Journal of Basic Microbiology, 2015-03-11) Santos, Everaldo Silvino dos; Gonçalves, Fabiano Avelino; Macedo, Gorete Ribeiro de
Production of cellulosic ethanol and holocellulosic ethanol from vegetable or microbial biomass starts with a hydrolysate containing compounds which may produce negative effects in the enzymatic hydrolysis and fermentation stages due to the need of pretreatment of the materials. In this way, the simultaneous presence of hydroxymethylfurfural (HMF), furfural, acetic acid, levulinic acid, and formic acid in different concentrations was tested in the fermentation using Saccharomyces cerevisiae, Pichia stipitis, and Zymomonas mobilis. The substitution of freshwater by seawater in the culture medium was also analyzed. Thus, inhibitory effects were stronger in the fermentation using P. stipitis, followed by Z. mobilis and S. cerevisiae. Formic acid and acetic acid presented more significant effects among the inhibitory compounds, followed by HMF, furfural and levulinic acid. Fermentation performed in culture medium with seawater showed promising results, especially in the ethanol yield using S. cerevisiae (0.50 g ethanol/g glucose) and Z. mobilis (0.49 g ethanol/g glucose). Whereas the production of cellulosic ethanol and holocellulosic ethanol are in early stages of development on an industrial scale, and that the availability and use of freshwater may cause socio‐environmental problems for expansion of ethanol production, the use of seawater appears as an alternative to mitigate this problem
Alternative fuels composed by blends of nonionic surfactant with diesel and water: engine performance and emissions
(Brazilian Society of Chemical Engineering, 2011) Dantas Neto, Afonso Avelino; Fernandes, M. R.; Barros Neto, Eduardo Lins de; Dantas, Tereza Neuma de Castro; Moura, Maria Carlenise Paiva de Alencar
Diesel-based microemulsions and a surfactant/diesel blend, using ethoxylated (5 EO) nonylphenol as surfactant, were prepared and tested in a diesel engine to evaluate its performance and emissions. The following properties were evaluated: density, viscosity, cloud point and corrosiveness. Experimental results showed that density and viscosity were greater than those obtained for neat diesel. Cloud point and corrosiveness were not affected by water and surfactant. Specific fuel consumption of the microemulsion systems was greater than that of diesel, but the small droplets of water improved diesel combustion. Compared with diesel, an increase in carbon monoxide (CO) and nitrogen oxide (NOx) emissions and a decrease in black smoke emissions were obtained. In general, only microemulsions with up to 6% water are in accord with Brazilian diesel/biodiesel fuel regulations and specifications
Anacardium occidentale L. leaves extraction via SFE: Global yields, extraction kinetics, mathematical modeling and economic evaluation
(Elsevier, 2013-03-22) Leitão, Nayane Carla Márcia Cavalcanti de Sá; Prado, Helena Carvalho do; Veggi, Priscilla Carvalho; Meireles, Maria Angela Almeida; Courtial, Camila Gambini Pereira
The purpose of this work was to obtain extracts from Anacardium occidentale leaves using supercritical fluid extraction (SFE). The use of ethanol and isopropyl alcohol as co-solvents was evaluated. Mass transfer kinetics experiments were performed, and overall extraction curves were modeled. SFE process was compared with different low pressure solvent extraction processes in terms of global yield and the composition of the extract. The techniques used as low pressure solvent extraction processes were: Soxhlet extraction, agitated bed extraction, ultrasound assisted extraction using ethanol as the solvent and hydrodistillation. The extracts were analyzed by thin layer chromatography (TLC) using different eluents. Finally, the economic evaluation was conducted using the software SuperPro designer 6.0® to simulate the process and to estimate the cost of manufacturing (COM) of SFE extracts. The results indicated the presence of essential oils, lavonoids and antioxidant compounds in all the extracts. The higher yield of extract was obtained with the ultrasound assisted extraction. However, the samples with more functional compounds were verified in the SFE extracts and the extracts showed low COM. The model that best described the overall extraction curves for the SFE process was the Sovová model, which showed minimum values for the sum of the squares of the residues
Análise da desidratação osmótica do feijão verde (Vigna Unguiculata L. walp)
(Instituto Federal do Rio Grande do Norte - IFRN, 2011) Queiroga, Priscila Vanini Dantas de Medeiros; Medeiros, Maria de Fátima Dantas de; Mata, Wilson da; Mata, Ana Lúcia de Medeiros Lula Da
O objetivo desta pesquisa foi realizar um estudo do processo de desidratação osmótica para o feijão verde (Vigna unguiculata L. Walp). O feijão verde utilizado foi adquirido no mercado local (CEASA/RN). Os grãos foram selecionados e branqueados a uma temperatura de 88ºC durante 3 min. Os experimentos foram realizados utilizando uma solução osmótica de 5% e 10% de NaCl, com e sem agitação da mesma e em temperaturas de 25ºC e 40ºC, totalizando 8 ensaios. Cada ensaio durou 30 minutos. Os resultados obtidos com este estudo apontam como melhor condição de processo o ensaio realizado sem agitação, à temperatura de 25ºC e solução osmótica contendo 10% de NaCl. Neste ensaio o feijão apresentou uma perda de água (WL) de aproximadamente 12,69% e um ganho de sólidos (GS) de -0,96%
Análise microestrutural de misturas cerâmicas de grês porcelanato com adição de chamote de telhas cerâmicas
(ABCERAM, 2009) Melo, Maxymme Mendes de; Pinheiro, Andrea Santos; Nascimento., Rubens Maribondo do; Martinelli, Antonio Eduardo; Dutra, Ricardo Peixoto Suassuna; Melo, Marcus Antônio de Freitas
A necessidade de reutilizar e reciclar rejeitos e resíduos tem exigido das indústrias cerâmicas novas posturas diante do processo de fabricação e seleção de suas matérias-primas. A indústria de telhas de cerâmica vermelha, apesar de constante progresso, ainda não consegue evitar a grande produção de rejeitos oriundos de processamento deficiente de seus produtos, principalmente na etapa de queima. Produtos super queimados, trincados, quebrados, sem uniformidade de geometria ou de cores, muitas vezes são descartados em aterros, causando prejuízo ambiental. Além disso, há o desperdício de energia, matéria-prima e mão-de-obra, utilizadas na fabricação de produtos não comercializáveis. Em muitas empresas, tais produtos chegam a representar cerca de 20% de sua produção mensal. Os produtos descartados podem ser reutilizados na produção de cerâmicas, inclusive com maior valor agregado, como grês porcelanato, desde que se conheça seu comportamento quando adicionado à massas cerâmicas. O presente trabalho tem como objetivo estudar o desenvolvimento microestrutural de massas para grês porcelanato contendo rejeitos de telhas, ou chamote. Foram selecionadas duas formulações conhecidas, uma para grês porcelanato e outra para grês, e adicionados teores de chamote de 10%, 20% e 30%. Três temperaturas de queima foram estudadas, 1150 oC, 1200 oC e 1250 oC com taxa de aquecimento de 10 oC/min. Amostras sinterizadas com e sem chamote foram avaliadas quanto à sua microestrutura, absorção de água e porosidade aparente. Tanto a massa para grês porcelanato como para grês tiveram absorção de água reduzida coma adição de chamote. A massa para grês com adição de 30% de chamore e queimada a 1250 oC passou a ser considerada grês porcelanato, por ter apresentado absorção de água inferior a 0,5%. O chamote por sua composição mineralógica pode auxiliar na redução da quantidade de matérias-primas fundentes tradicionais, como feldspato e talco, exigidas na fabricação de grês porcelanato
Analysis of petroleum oily sludge produced from oil-water separator
(Universidade Federal do Rio Grande do Norte, 2014-07-08) Chiavone Filho, Osvaldo; Lima, Cícero S.; Lima, Regineide de Oliveira; Silva, Edjane Fabiula Buriti da; Castro, Kesia Kelly Vieira de; Soares, Sandra A.; Araújo, Antônio S.
The petroleum oily sludge is formed during the production, transportation, and storage processes as well as in the oil refinery plant. The elemental analysis was performed with samples of petroleum oily sludge collected in the State of Rio Grande do Norte. For the carbon and hydrogen elements, small differences were observed between them, but for the oxygen element, bigger differences between the sludge samples were noticed. They have presented differences in the chemical composition of inorganic and organic parts. The sludge from oil-water separator (OWS) 2 showed a high amount of oil (94.88%), being considered a high value-added residue by the oil industry. In the analyses of saturated, aromatics, resins, and asphaltenes (SARA) components, the sludge from the unloading had a high amount of saturates. The inorganic material separated from the sludge of the OWS 2 was characterized, and presented a lot of sulfur (41.57 %). The sludge analyzed showed a high value of organic components, thus such material can be handled and reprocessed in processing units within the oil industry
Analysis of solar and artificial UVA irradiations on the photo-Fenton treatment of phenolic effluent and oilfield produced water
(Taylor and Francis, 2018-05-30) Chiavone Filho, Osvaldo; Mota, André Luís Novais; Lopes Neto, Luiz Gonzaga; Foletto, Edson Luiz; Nascimento, Cláudio Augusto Oller do
In general, the oil industry has been searching for ways to alleviate the abundant disposal of oilfield produced water, which contains dissolved hard-removal and highly toxic organic compounds. Advanced oxidative processes (AOPs) have revealed to be effective in the degradation of organic compounds, because they generate hydroxyl radicals with high oxidizing potential which are capable of degrading these compounds. The present study has demonstrated the degradation efficiency of effluents containing organic compounds although the photo-Fenton process using a tubular photochemical reactor under different energy sources. This reactor allowed the use and evaluation of two ultraviolet irradiation sources, the sun and black light lamps, besides other relevant variables to the process, such as reagents concentration and the irradiated area, using a model effluent containing phenol. A sample of oilfield produced water was photochemically degraded through the optimum experimental conditions found for the phenol degradation. Solar irradiation was more efficient than lamplight, and it corresponds an important factor for the reduction of operating costs of this process. The solar reaction system applied to the oilfield produced water showed a removal of organic components up to 76%
Anticancer activity of Tabernaemontana catharinensis extract obtained by supercritical fluid extraction
(Sociedade Brasileira de Plantas Medicinais, 2006-10-31) Courtial, Camila Gambini Pereira; Carvalho, J. E.; Meireles, Maria Angela de Almeida
In the present work the anticancer of crude supercritical fluid extract from T. catharinensis was evaluated. The crude extract was obtained using supercritical CO² at pressure of 300 bar and temperature of 55º C; ethanol was used as cosolvent (4.6% mass). The anticancer activity was tested against seven human cancer cell lines: lung, breast, breast expressing rhe multidrug resistance phenotype, melanoma, colon, prostate, and, kidney. The crude extract was fractionated and the alkaloidal fraction was analyzed by thin-layer chromatografy (TLC), and gas-chromatography/flame ionization detector (GC-FID). The GC-FID of the alkaloidal fraction indicated the presence of the indole alkaloids voacangine and coronaridine. The crude extract of T. catharinensis has anticancer activity that begins at 0.25 ug/mL and exhibits cytostatic and cytolytic effects concentration dependent and noy selective for the cell lines used
Antimicrobial and antibiofilm activity of essential oil of lippia gracilis schauer on clostridium bifermentans and fungal-containing biofilms
(Austin Publishing Group, 2019) Santos, Everaldo Silvino dos; Viana, Marcelino Gevilbergue; Lutterbach, M. T. S; Silva, D. R.; Albuquerque, C. C.; Santos, F. J. N.
In oil industry microbiologically influenced corrosion plays a key role since it costs a lot of money yearly. This kind of corrosion is mainly induced by the microbial biofilms occurring on the metal surface and their metabolites that modify the electrochemical conditions from metal-solution interface. This study focused on the evaluation of the antimicrobial activity of essential oil of Lippia gracilis Schauer over Clostridium bifermentans isolated from ballast of ship transporter of crude oil as well as against fungi occurring on microbial biofilms. Additionally, it was evaluated the influence of the essential oil on the corrosion of AISI 1020 carbon steel by electrochemical and gravimetric techniques. A minimum inhibitory concentration of the 20.0μg.L-1 was obtained for the essential oil over the C. bifermentans that was the same used for investigating the biocide activity against fungal biofilms for different contact time. Results showed that colony former unit (CFU) for fungi reduced to zero after 120 minutes exposition to the essential oil. Also, the essential oil of L. gracilis Schauer showed a quite good potential to control effectively the growth of C. bifermentans. Electrochemical polarization and gravimetry assays showed that essential oil of L. gracilis Schauer at concentration of 60μg.L-1 was efficient to inhibit the corrosion of AISI 1020 carbon steel. L. gracilis Schauer essential oil acted as a powerful biocide
Aplicação de dicloroisocianurato de sódio e ácido peracético para redução de esporos de Penicillium expansum, Byssochlamys fulva e Alicyclobacillus acidoterrestris na superfície de maçãs e em soluções aquosas
(UNESP, 2011) Salomão, Beatriz de Cássia Martins; Muller, Chalana; Massaguer, P. R.; aragão, Gláucia Maria Falcão
A eficácia do sanitizante clorado orgânico dicloroisocianurato de sódio (Dicloro) e do ácido peracético foi testada contra esporos de Penicillium expansum, Byssochlamys fulva e Alicyclobacillus acidoterrestris em superfície de maçãs e em solução aquosa. Os esporos de P. expansum foram efi cazmente eliminados em ambas as condições usando dicloro, sendo que mais que 6 reduções decimais (RD) foram obtidas a 25ppm/6min em solução aquosa. Entretanto, o ácido peracético mostrou-se inefi - caz na redução de esporos de P. expansum. Na superfície da maçã, os demais micro-organismos sofreram <1RD com ambos os sanitizantes. Em solução aquosa o dicloro mostrou-se mais efi caz que ácido peracético. B. fulva apresentou- se mais resistente que A. acidoterrestris sendo este mais resistente que P. expansum. Concluiu-se que dicloroisocianurato de sódio foi o sanitizante mais efi caz, sendo recomendado na concentração de 25ppm para uso na água de resfriamento das maçãs destinadas à estocagem e também na água de lavagem, visando, assim, destruir esporos de P. expansum e reduzir o risco de produção de patulina no produto final. Nenhum sanitizante foi efi caz contra os esporos de A. acidoterrestris e B. fulva
Aplicação do gerenciamento ambiental em um cultivo de camarões com a abordagem nas ferramentas de produção mais limpa
(Unisinos, 2008) Lima, Iran Marques de; Melo, Henio Normando de Souza; Medeiros, Gilson Gomes de; Medeiros, Veder Ralfh Fernandes de
O objetivo do trabalho é apresentar as oportunidades de implementação da produção mais limpa (P+L) em uma fazenda de cultivo de camarões. A metodologia utilizada foi pesquisa exploratória, realizada pela investigação via estudo de caso, implementada em uma unidade produtiva localizada no nordeste do Brasil. O trabalho aborda desde aspectos genéricos da técnica no que diz respeito ao gerenciamento do uso da água, energia, e da caracterização do efluente desta atividade produtiva. Discute aspectos quantitativos, considerações ambientais, e oportunidades de P+L nas fases do processo produtivo. Os resultados apontam para economias de insumos sob a forma de alimentos, corretivos de solo, medicamentos, e energia aplicados ao processo, que variam de 4 a 27%, ressaltando-se que o pequeno ganho financeiro, deve ser encarado como uma fonte de considerável benefício ambiental. Os autores concluem pela da adoção da técnica neste segmento do agronegócio, ressaltando a importância do gerenciamento da dosagem de insumos na qualidade do efluente final, além da adoção de um mecanismo de remediação físico-química para o residual de metabissulfito de sódio utilizado na despesca

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