Programa de Pós-Graduação em Engenharia Química - PPGEQ/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2308

O Programa de Pós-Graduação em Engenharia Química (PPGEQ) do Insituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA). Sendo aprovado pela CAPES / MEC em 1991, foi oficialmente iniciado em março de 1992.

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Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Caracterização e proposta de tratamento de lixiviados de resíduos de madeira
(Universidade Federal do Pará, 2012-09-24) ALMEIDA JÚNIOR, Walter Figueiredo de; SILVA, Denilson Luz da; http://lattes.cnpq.br/4241759369873376
This is a characterization study and proposal for treatment of woodwaste leachate produced in laboratory. Woodwaste leachate or stormwater runoff or log yard runoff are generated when wood waste resulting fi-om the manufacturing process, are arranged inappropriately, making the interaction with water, generally climate rainfall, resulting in a dark colored liquid which can contam n a number of components with the potential negative impact on aquatic environments. The effluent generated in the laboratory was studied by two separate experiments. In Experiment A, in polyethylene bottles, were mixed water and sawdust in proportion 9:1, in an open system and room temperature for 90 days. At times 0, 1, 5, 10, 20, 30, 45, 60, 75, 80 and 90 days, the solution was filtered and brought to the laboratory for analysis. In Experiment B, stored in a plastic container (bucket type) about 5 kg of sawdust, where the bottom was adapted a drain to collect effluent. This system was exposed to sunlight and rainfall climate, so as to simulate the minimum conditions for generation ofleachate fi-om a waste pile of wood in the real case. In both observed the generation of a liquid amber beige to dark, strong characteristic odor, slightly acidic (pH 5.53 to 6.97), high oxygen demand (BOD 17 — 310 mg.L-1; COD 857 — 3161 mg.L-1; DO 0.63 — 5.56 mg.L-1), high charges of organic matter (TC 170.93 — 425.19 mg.L-1, TOC 167.66 — 415.66 mg.L-1 and TIC 2.22 — 34.05 mg.L-1), high solids concentrations (SS 10 — 23 mL.L-1; TSS 463 — 1330 mg.L-1; TDS 31 — 640 mg.L-1 and turbidity 10.0 — 638.5 UNT). Due to these characteristics has been proposed a physicochemical treatment for runoff produced by combining the processes of coagulation/flocculation and oxidation with potassium permanganate, which resulted, respectively, in the removal of 20.95% and 88.53 % of COD, 98.18% and 43.31% of color, 40.45% and 98.16 of turbidity, 65.71% and 100% of TSS, per process. The overall removal efficiency of the proposed treatment was 90.93% of the values of COD, 98.97% in true color values, 98.90% of turbidity and 100.00% values of TSS.
Acesso aberto (Open Access)
Estudo da utilização de polímeros naturais como auxiliares de floculação no tratamento de água para fins industriais
(Universidade Federal do Pará, 2012-09-27) SILVA, Juliane da Silva e; SILVA, Denilson Luz da; http://lattes.cnpq.br/4241759369873376
This work is to evaluate the effectiveness of new alternatives for use with natural species of okra (Abelmoschus esculentus) seed angico red (Anadenanthera peregrina (L.) Speng) and seed-eye dragon (Adenanthera pavonina L.) also known as ‘falso angico’, sprayed with a particle size of 0.074 mm, sieving for water treatment as natural polymers, helping the flocculation on removal of main parameters in turbidity and color through tests in the scanner equipment using Jar Test static bench adding a chemical coagulant (aluminium sulfate). The powder of polymers were obtained after washing, drying, crushing, grinding, sieving, and used in the coagulation process, flocculation and sedimentation to test the efficiency of each one, when used alone and when used in conjunction with the chemical coagulant, followed by the analysis of physical-chemical parameters pH, turbidity, apparent color, true color and temperature. The results showed that the polymer of okra presented better efficiency in removing turbidity and color compared to the same doses used with other polymers considered and when reducing the dosage of coagulant used in conjunction with the polymers, it was observed a great removal of turbidity, especially with the conjunction of coagulant and polymer of okra, with the removal efficiency of 94% of turbidity and 98% of color with optimum dosage of okra equal to 1.0 mg/L and coagulant equal to 10 mg/L. Therefore it is possible to reduce the dosage of the coagulant when used in conjunction with the auxiliary flocculation, as the polymer of okra can be used for water treatment and facing the possibility of multiple economic and ecological uses in industry.
Acesso aberto (Open Access)
Obtenção e caracterização de carvão ativado de caroço de buriti (Mauritia flexuosa L. f.) para avaliar o processo de adsorção de uma solução de Cu (II)
(Universidade Federal do Pará, 2013-09-30) PINTO, Marcos Vinicios de Souza; SILVA, Denilson Luz da; http://lattes.cnpq.br/4241759369873376
Buriti core carbon (CCB) was produced from the reject of artisanal production of its fruit for the extraction of oil, heated to 400ºC. Then, the CCB was activated at temperatures of 800ºC and 900ºC. Adsorption tests were performed to evaluate the discharge of these activation temperatures in the adsorption of a solution of copper (II) to a known initial concentration of 50 mg/L. After having examined the results, it was decided by the activation of coal to 900ºC. The activated carbon of the buriti core (CACB) to 900ºC was characterized according to commercial properties such as specific area, porosimetry, apparent and real densities, porosity of a bed fix, scanning electron microscopy, ash content, pH, moisture, fixed carbon and acid surface functional groups present in the CACB. The results showed a higher removal efficiency of copper (II) to the diameter D < 0.595 mm, for the contact time of 300 minutes, for the pH of 4.01 and the initial concentrations of copper (II) 50 and 80 mg/L. Mathematical models of Langmuir and Freundlich were applied to the data of adsorption equilibrium. The mathematical model of Langmuir was the best fit to the data of balance. The Langmuir’s mathematical model was the best fit to the data of balance. According to data from the kinetic equilibrium, it was observed that from the contact time of 15 minutes all the equilibrium concentrations were below the allowed maximum of 1,0 mg/L under the law CONAMA nº 357/2005 for release effluent into aqueous environments. The experimental results obtained are indicative that it is possible to remove copper (II) from industrial effluent using CACB activated physically at 900ºC for a period of 60 minutes.
Acesso aberto (Open Access)
Produção de carvão ativado a partir da biomassa residual da castanha do Brasil (Bertholletia excelsa L.) para adsorção de cobre (II)
(Universidade Federal do Pará, 2012-09-20) MELO, Selma dos Santos; SILVA, Denilson Luz da; http://lattes.cnpq.br/4241759369873376
Activated carbon was produced from the Brazil nut bark (Bertholletia excelsa l.) to be used in the cooper (II) removing, in adsorption process in bath system. The bark is a waste material from the chestnut improvement which was collected, selected, washed in running water and then it was dried up in stove at 150 °C in 24 h. The carbons were charred at 400 °C for 3h and thermally activated at 800 °C in 1, 2 and 3 hours time when they received its encodings CA1, CA2 and CA3 respectively. Then they were characterized as: the specific superficial area, volume and pores size, X-ray diffraction, scanning electron microscopy (SEM) coupled to EDS (energy dispersive X-ray system) and Fourier transformed infrared spectroscopy FTIR). Preliminary tests were performed to assess the carbon efficiency as cooper (II) removing in synthetic solution of 50 mg L-1 initial concentration. As the results were satisfactory to CA1, CA2 and CA3 (93,43, 97,23 and 96,92 % to those carbons), decided by what had higher removing percentage of. The CA2 was produced and characterized as: the real and apparent densities, porosity in fixed bed, pH, moisture (wet basis), ashes, fixed carbon and functional groups by Boehm method. There were preformed tests to determine the cooper (II) efficiency removing concerning the carbon particle diameter influence, pH of the solution, contact time influence and variation of the initial concentration. The results of higher removing percentage were to diameter 0,595≤D≤1,19 mm, pH 5,09, in time of 5 min and concentrations of 50, 100 e 150 mg L-1. The adsorption kinetic study that best fit according to data was pseudo-second order model. The experimental data that presented good fit according to mathematical models of Langmuir and Frendlich isotherm. In this sense, was obtained activated carbon at a low cost from the Brazil nut bark which one showed a good efficiency in cooper (II) removing process and also allowing the using in the effluents treatment.

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