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Browsing by Author "Boloy, Ronney Arismel Mancebo"

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  • Cassava-processing wastewaters: bioremediation potential of immobilized Chlorella vulgaris (Chlorophyceae)
    Publication . Medeiros, V.; Loures, C.C.A.; Boloy, Ronney Arismel Mancebo; Fernandes, Conceição
    Most cassava processing industry generates a large volume of wastewater effluent with high contaminating load of COD and BOD and cyanide concentration, posing to a serious threat to the environment. A variety of processes has been tested to treat this wastewater effluent, where the effectiveness in reducing the toxicity varies greatly. Microalgae are photosynthetic microorganisms that can rapidly generate biomass from solar energy, CO2 and nutrients in water, namely those present in wastewater effluents. Also, algal biomass and algae-derived compounds are potentially useful in industrial applications, as well as for biodiesel production. Taking this into account, the aim of this work was evaluated the ability of Chlorella vulgaris to growth on cassava-processing effluent and assess the bioremediation potential by evaluating toxicity of effluent. Batch cultures, with C. vulgaris in suspended and in immobilized-cell systems, under different dilutions (20-50%) of cassava effluent were tested. The effectiveness of the process has been assessed by phytotoxicity, in germination trials of Lactuca sativa. Best results were obtained with C. vulgaris in immobilized-systems and carried out with higher initial cell concentrations. Regarding the phytotoxicity, after biotreatment we can conclude that microalgae can reduce the toxicity of cassava effluent, leading to Germination Increase index (GI) range of 88-100%.
    2017Conference paper Open access Show more
  • Estado da arte da incorporação de um sistema de cogeração de energia em uma planta de produção de biodiesel e hidrogênio
    Publication . Nobrega, Glauco; Boloy, Ronney Arismel Mancebo; Soares, Orlando
    The steady increase in energy use across the globe forces society to seek alternatives to traditional sources of energy, since these are not only considered to be finite but also have a significant environmental impact. In this context, alternative forms of fuels that are renewable and ecologically sustainable are gaining notoriety. In this way, the article aims to present the raw material and products generated in a hydrogen and biodiesel production plant and, in addition, demonstrate how a cogeneration process has the potential to make this production even more sustainable and economical.
    2017Conference paper Open access Show more
  • Estado da arte sobre as inovações na cadeia de processamento da mandioca para produção de farinha seca
    Publication . Chaves, Yasmim; Boloy, Ronney Arismel Mancebo; Soares, Orlando
    A mandioca é uma cultura tropical que tem grande importância na segurança alimentar e supre exigênicas nutricionais, por isso seu plantio está crescendo a cada ano. A produção mundial de mandioca é de cerca de 276,7 milhões de toneladas por ano, sendo a Nigéria o maior produtor mundial com 19,5% de produção, seguida da Tailândia com 10,9% e da Indonésia com 8,6% de produção. O Brasil está em 4º lugar com 7,7% da produção mundial. O principal produto produzido a partir de mandioca é a farinha seca, atingindo níveis acima de 90%. Como um subproduto deste processo, temos um efluente industrial chamado "manipueira", que é liberado durante o processo de prensagem. Esse efluente é muito tóxico e poluente quando não tratado, apresentando também alto potencial em gás metano e, portanto, podendo ser usado como recurso energético para a produção de biocombustíveis.
    2017Conference paper Open access Show more
  • Gaseificador de blocos de madeira em leito fluidizado: uma revisão
    Publication . Chaves, Camila Fonseca; Boloy, Ronney Arismel Mancebo; Ribeiro, Luís Frölén
    O estudo inicia-se a partir do aproveitamento da biomassa em um gaseificador no qual é gerado cinzas e um gás de síntese. Existem três tipos mais comuns de gaseificadores, sendo estes o gaseificador de leito fluidizado, gaseificador de leito fixo e gaseificador de fluxo de arraste. As quatro etapas do processo de gaseificação são descritas como secagem, pirólise, combustão e redução. O gás de síntese gerado a partir do gaseificador passa por um ciclone, ou mais comumente chamado de catalisador, onde são retirados os materiais particulados e suas impurezas, sendo o alcatrão o resíduo que pode ser denominado um grande desafio para a purificação. Posteriormente, o gás de síntese alimentará um sistema chamado de acionadores primários, sendo eles os motores de combustão interna (Otto ou Diesel), motor de combustão externa (Stirling) microturbinas e células combustíveis.
    2017Conference paper Open access Show more
  • Performance study of a microturbine system for cogeneration application using biogas from manipueira
    Publication . Chaves, Yasmim; Springer, Marcus; Boloy, Ronney Arismel Mancebo; Soares, Orlando; Madeira, Jonni Guiller Ferreira
    Cassava is a commodity that has great importance in food security in many developing countries. The main product in Brazil produced from cassava is the flour, representing approximately 60% of the cassava final destination. As a by-product of this process, we have a wastewater called manipueira. This effluent is highly toxic because it contains cyanidric acid. The manipueira has great potential for biogas production, adding values to the cassava production chain and, also, reducing the content of cyanidric during the methanation process. This study analyzes the energy and economic efficiency of the biogas production from the manipueira produced in a large power plant, using it as an energy source in the feeding of a cogeneration system composed of a gas microturbine and a heat recovery system, whose purpose is to generate electric and thermal energy. The use of themicroturbine systeminstead of other conversion technology is based on the power it presents when it is used for cogeneration, increasing the systemefficiency. The study showed that from the economic feasibility calculation, it was possible to determine the cost of producing electricity of US$ 0.16/kWh and of thermal energy of US$ 0.04/kWh with an amortization period of 1.3 years. The results obtained from these analyzes showed that the use of this biofuel is a good choice for energy generation.
    2019Journal article Restricted access Show more
  • The profile of studies on renewable energy in sustainable supply chain
    Publication . Marques, Eduardo do Carmo; Azevedo-Ferreira, Maxwel de; Hernández-Callejo, Luis; Boloy, Ronney Arismel Mancebo; Guimarães, Vanessa de Almeida
    Over the years, has been growing policies aiming toreducethe green-houses gases emissions–GHG, which lead for the searching ofsustainable alter-native solutions. One waymitigatesthe GHG emissionsisthe use of renewable energy sources. Nevertheless, for the use of such resources there are a series of processes inherent to the energy production and consumption, being the supply chain one of the principals. Based on this, the main objective of present article is tomapthe roleof renewable energies inside the context of sustainable supply chain, observing how the studies have been developed, looking for the main re-searchers, organizations andcollaboration networks, being at final a mapping of the 15 most cited studies in area. The research was carried out with the papers published atWeb of Science database, using VantagePoint software to quantify the information’s, including the evolution of studies over time until 2019.It was possible to perceivethat the researchhasbeen growingsince 2010, moreover, subjects related to biomass, biofuels and photovoltaic energy were the most re-currentat the most cited. However, within this framework, the theme presented itself as new and that there are still great potentials to be explored
    2020Conference paper Open access Show more