Revista Ambiente & Água

URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/13311

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2013 - 20163

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Data inicial: 2013Data final: 2019

Resultados da Pesquisa

Agora exibindo 1 - 3 de 3
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    Kinetic parameters of biomass growth in a UASB reactor treating wastewater from coffee wet processing (WCWP)
    (Instituto de Pesquisas Ambientais em Bacias Hidrográficas, 2014) Campos, Claudio Milton Montenegro; Prado, Marco Antonio Calil; Pereira, Erlon Lopes
    This study evaluated the treatment of wastewater from coffee wet processing (WCWP) in an anaerobic treatment system at a laboratory scale. The system included an acidification/equalization tank (AET), a heat exchanger, an Upflow Anaerobic Sludge Blanket Reactor (UASB), a gas equalization device and a gas meter. The minimum and maximum flow rates and volumetric organic loadings rate (VOLR) were 0.004 to 0.037 m3 d-1 and 0.14 to 20.29 kgCOD m-3 d-1, respectively. The kinetic parameters measured during the anaerobic biodegradation of the WCWP, with a minimal concentration of phenolic compounds of 50 mg L-¹, were: Y = 0.37 mgTVS (mgCODremoved)-1, Kd = 0.0075 d-1, Ks = 1.504mg L-1, μmax = 0.2 d-1. The profile of sludge in the reactor showed total solids (TS) values from 22,296 to 55,895 mg L-1 and TVS 11,853 to 41,509 mg L-1, demonstrating a gradual increase of biomass in the reactor during the treatment, even in the presence of phenolic compounds in the concentration already mentioned.
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    Distribuição espacial do efluxo de CO2 em área de terra preta arqueológica sob cultivo de cacau e café no município de Apuí, AM, Brasil
    (Instituto de Pesquisas Ambientais em Bacias Hidrográficas, 2016) Campos, Milton Cesar Costa; Alho, Leandro Coutinho; Silva, Diogo André Pinheiro da; Soares, Marcelo Dayron Rodrigues; Cunha, José Mauricio da; Silva, Douglas Marcelo Pinheiro da
    As Terras Pretas Arqueológicas (TPA) são solos que podem concentrar até seis vezes mais carbono orgânico que solos adjacentes sem horizonte A antrópico, presumindo-se, dessa forma, maior efluxo de CO2 nesses solos. O objetivo deste estudo foi investigar a distribuição espacial do efluxo de CO2, temperatura e umidade do solo em área de Terra Preta Arqueológica sob cultivo de cacau e café no município de Apuí, AM, Brasil. Foram construídas malhas amostrais nas dimensões 42 x 80 m, com espaço entre os pontos de 8 x 10 m e 6 x 10 m para as áreas de cacau e café, respectivamente. Após a etapa de coleta dos dados do efluxo de CO2, temperatura e umidade do solo, procedeu-se a análise estatística descritiva e geoestatística. Os resultados mostraram que os parâmetros avaliados apresentam dependência espacial, com alcance variando de 25 a 40 m para o efluxo de CO2 da área TPA com cacau. O efluxo de CO2 na área de cacau foi superior, com valor médio de 5,49 μmol m-2 s-1, comparado ao 3,99 μmol m-2 s-1 de CO2 da área com café.
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    Occurrence of pesticides from coffee crops in surface water
    (Instituto de Pesquisas Ambientais em Bacias Hidrográficas, 2013) Soares, Alexandra Fátima Saraiva; Leão, Mônica Maria Diniz; Faria, Vanessa Heloisa Ferreira de; Costa, Márcia Cassimira Marcos da; Moura, Ana Clara Mourão; Ramos, Vladimir Diniz Vieira; Vianna Neto, Márcio Ribeiro; Costa, Elizângela Pinheiro da
    The excessive amount of pesticides applied in agricultural areas may reach surface water, thereby contaminating it. Thus, the main purpose of this study was to investigate the presence of pesticides used in a sub-basin headwater with coffee crops, situated in the Dom Corrêa district, Manhuaçu, Minas Gerais. The region of study is a great producer of coffee. Crops occupy steep areas and are situated close to surface water bodies. In this study, four sample collection points were selected in streams as well as a point in the distribution network and two points in the water treatment station (raw and treated water) a total of seven points. The samples were collected in rainy and dry seasons. Organochlorines, organophosphates, pyrethroids, carbamates and triazoles pesticides were identified by liquid and gas chromatography analysis with tandem mass spectrometry. The occurrence of pesticides was more evident in the rainy season. A total of 24 distinct pesticides were detected. At least one pesticide was identified in 67% of the samples collected during the rainy season and in 21% of the samples collected during drought. Many pesticides detected in water are not regulated in Brazilian legislation regarding potability.