Engenharia Ambiental

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http://repositorio.ufes.br/handle/10/17610
Programa de Pós-Graduação em Engenharia Ambiental

Centro: CT
Telefone: (27) 3335 2324 R*9510
URL do programa: http://www.ambiental.ufes.br/pos-graduacao/PPGEA

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Navegando Engenharia Ambiental por Assunto "2,4-D Herbicide"

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    Produção de biomassa com microalgas em lagoa de alta taxa aplicada ao pós-tratamento de um reator UASB tratando esgoto sanitário visando a produção de carvão ativado
    (Universidade Federal do Espírito Santo, 2019-07-12) Oss, Rodrigo Nunes; Cassini, Servio Tulio Alves; https://orcid.org/0000000152003666; http://lattes.cnpq.br/2519874649699294; https://orcid.org/0009-0006-5399-3394; http://lattes.cnpq.br/3669274322380234; Goncalves, Ricardo Franci; https://orcid.org/0000000220489451; http://lattes.cnpq.br/9604327349698525; Kiperstok, Alice Costa; https://orcid.org/0000-0002-9265-4858; http://lattes.cnpq.br/9336655439177257; Borges, Raquel Machado; https://orcid.org/0000-0001-8119-7092; http://lattes.cnpq.br/6650916642132386; Oliveira, Jairo Pinto de; https://orcid.org/0000000175951183; http://lattes.cnpq.br/2228283301316218; Junior, Miguel Angelo Schettino; http://lattes.cnpq.br/3366999814625339; Coelho, Edumar Ramos Cabral; https://orcid.org/0000000292205737; http://lattes.cnpq.br/2276795519317927
    Considering the water resources pollution, the water and energy scarcity, it is necessary to develop sustainable Technologies based on NEXUS concept. The aim of this research was to evaluate the ideal condition for the post-treatment of an UASB reactor, treating domestic wastewater, and production of microalgae biomass in High Rate Algal Ponds (HRAP) to generate activated carbon. This study was divided into three papers. In the first paper, the influence of the depth (30, 45 and 60 cm) and the hidraulic retention time (3 and 6 days) of the HRAP for the post-treatment of an UASB reactor, treating domestic wastewater, and production of microalgae biomass. The injection of biogas for supplementation of inorganic carbon in HRAP was also evaluated. The findings of this study showed that the efficieny of the post-treatment of an UASB efluente was satisfatory, achieving a reduction of 67% for COD, 49% for total phosphorous (P), 83% of total Kjeldhal nitrogen (TKN), 87% of ammoniacal nitrogen and 99.8% of E. coli. The microalgae biomass production was highest for the lower retention time. The supplementation of low concentration of CO2 increased the productivity (32%) with regards to volatile suspended solids. The second paper investigated the influence of temperature and the ratio between the mass of water and the mass of sample during the carbonization and activation of raw microalgae biomass as well as microalgae biomass with the addtion of tanfloc. Activated carbon was prepared at 650ºC and 800ºC, using diferente proportion of water. Although a higher amount of activated carbon was produced at 650ºC (41% more), the largest specific surface area (SSA) was 177±19 m²/g, whereas the activated carbono prepared at 800ºC presented an SSA of 630±18 m²/g. In the last paper, two of the activaded carbon, previously produced (BM and BMT), was tested to adsorb 2,4-D herbicide at six different concentration (5, 10, 25, 50, 100, 150 mg/L). The AC of BMT presented higher removal of 2,4-D, achieving 100% for the concentrations of 5, 10 and 25 mg/L. The Langmuir isotherm model was the one that best fitted to the experimental data, presenting R2 of 0,998. The pseudo second order kinetics presented good fit for both samples of activated carbon.
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    Síntese e caracterização de biocarvões ativados a partir de resíduos de biomassa aplicados na remoção do herbicida 2,4-D em água
    (Universidade Federal do Espírito Santo, 2018-12-11) Brito, Gilberto Maia de; Freitas, Jair Carlos Checon de; Coelho, Edumar Ramos Cabral; Buarque, Diogo Costa; Gonçalves, Ricardo Franci; Schettino Júnior, Miguel Ângelo; Capelo Neto, José
    In this work, porous and applied carbonaceous materials were synthesized and characterized in the removal of the 2,4-D herbicide present in contaminated water samples by adsorption. Activated carbons (ACs) were prepared using three different types of precursors of renewable origin and very common in Brazil: sugarcane bagasse, coconut shell and endocarp of babassu coconut. The activated charcoal production process was conducted by simultaneous carbonization and physical (steam) activation in a horizontal furnace with a heating ramp of 5.0 ° C min-1 to 800.0 °C, with a water injection of 200.0 ºC and with residence time of 1 hour at 800.0 ºC. Carbonized materials with the same types of precursors were also produced under the same conditions, but without physical activation for comparison purposes. The ACs and carbonized samples were characterized by the following techniques: specific surface area, thermogravimetry, X-ray diffraction, infrared, scanning electron microscopy, nuclear magnetic resonance and elemental analysis of oxygen content. The samples of the ACs produced were compared with commercial samples produced by the companies Bahia Carbon and Merck, in addition to other studies reported in the literature, in terms of specific surface area using the model proposed by BrunauerEmmett-Teller by adsorption of N2 gas at 77 K. The specific surface area values found for the carbon samples from sugarcane bagasse, coconut husk and endocarp of babassu coconut were equal to 547, 991 and 1068 m2 g -1 , respectively. The kinetic adsorption process of 2,4-D in aqueous solutions in the ACs was studied according to the Langmuir, Freundlich and other models and compared to each other. In the study of the intermolecular interaction Herbicide-Activated Charcoal, considering two types of herbicides, the (N- (phosphonomethyl) glycine (glyphosate) and 2,4-D, was carried out in the light of Computational Molecular Modeling by the semi empirical method and the thermodynamic parameters were obtained and evaluated.