4 results on '"Matias, Marcelo Seleme"'
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2. Production of Solid Recovered Fuel from the Rejected Fraction of Recyclable Materials from Waste Picker Cooperatives: A Case Study in Brazil.
- Author
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Piaia, Eduarda, Cavali, Matheus, Nadaleti, Willian Cézar, Matias, Marcelo Seleme, Russo, Mário Augusto Tavares, and de Castilhos Junior, Armando Borges
- Subjects
WASTE recycling ,PETROLEUM waste purification ,ANALYTICAL chemistry ,EMISSIONS (Air pollution) ,WASTE products as fuel - Abstract
This study evaluated the feasibility of producing solid recovered fuel (SRF) from rejected waste from waste picker cooperatives (WPC). Three scenarios using different SRF and petroleum coke proportions in cement kilns were assessed. The samples of rejected waste from WPC were obtained in the city of Florianópolis, Brazil, and their physical and chemical characteristics were determined. Furthermore, the avoided atmospheric emissions by replacing conventional cement fuel with SRF and the costs to implement a SRF facility were estimated. According to the results, 60.29% of the waste from WPC could be used for energy recovery. Out of the materials eligible to produce SRF, 75.26% are made up of plastic packaging and paper. Concerning atmospheric emissions, replacing petroleum coke with SRF for direct feeding into the clinker kiln contributed to a reduction of 4.83%, 14.73%, and 13.37% in the atmospheric emissions for Scenario 1, Scenario 2, and Scenario 3, respectively. Furthermore, considering two hypothetical SRF industrial plants with capacities of 522 and 720 t/day, each ton of SRF produced would cost about USD 6.00, representing a decrease of 35 times in the costs when compared to petroleum coke. Therefore, SRF from the rejected fraction of WPC could be an alternative waste-to-energy approach. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Desenvolvimento e aplicação de ferramenta de apoio à decisão para avaliação de estratégias de gerenciamento de resíduos sólidos domiciliares
- Author
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Matias, Marcelo Seleme, Universidade Federal de Santa Catarina, and Castilhos Junior, Armando Borges de
- Subjects
Processo decisório ,Engenharia ambiental ,Resíduos sólidos - Abstract
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Ambiental, Florianópolis, 2021. Para que a governança do gerenciamento de resíduos sólidos seja pautada sobre técnicas adequadas que proporcionem a melhor tomada de decisão de longo prazo é preciso a compreensão adequada das soluções disponíveis para lidar com esses materiais. Esse trabalho reuniu e caracterizou diferentes arranjos operacionais de gerenciamento de resíduos sólidos domiciliares em evidência no Brasil e no cenário internacional para então desenvolver uma ferramenta de apoio à decisão que, incorporando as diferentes especificidades de cada arranjo, permite modelar e mensurar os fluxos quanti-qualitativos de resíduos ? desde a geração, tratamento, até disposição final ? e assim avaliar a performance econômica, social, energética e ambiental da cadeia operacional integrada dos sistemas de manejo, reais e potenciais, servindo de subsídio à gestão de resíduos sólidos domiciliares no contexto brasileiro e em países em desenvolvimento. A ferramenta de apoio à decisão, nomeada de TOTAL waste, foi aplicada em diferentes arranjos operacionais para um município-alvo de aproximadamente 500 mil habitantes. Os resultados da aplicação da ferramenta permitiram quantificar, em cada cenário analisado, o impacto em 20 anos de diferentes estratégias de gerenciamento de resíduos sólidos sobre diferentes critérios, tais como: despesas operacionais e de investimentos; número de pessoas necessárias para operação dos serviços; emissões equivalentes de dióxido de carbono, produção e consumo energético, entre outros. Pode-se concluir que a tomada de decisão deve estar devidamente instruída quanto aos resultados positivos e negativos de cada estratégia analisada, já que nenhum cenário analisado mostrou o melhor desempenho em todos os critérios. O melhor cenário mostrou ser aquele em que seus resultados estão alinhados aos atributos a serem preferencialmente adotados em uma tomada de decisão. Tal preferência não pode ser definida sem que se conheça as condições econômicas regionais, as demandas legais ambientais e as condições de emprego e renda. Abstract: The governance of solid waste management must be guided by appropriate techniques that provide the best long-term decision-making, for this it is necessary to have an adequate understanding of the available solutions to deal with these materials. This work characterized different operational arrangements for the management of household solid waste in evidence in Brazil and in the international scenario to then develop a decision support tool that, incorporating the different specificities of each arrangement, allows to model and measure the quantitative and qualitative flows of waste - from generation, treatment, to final disposal - and it allows to evaluate the economic, social, energy and environmental performance of the integrated operational chain of management systems, real and potential, serving as a subsidy to the management of household solid waste in the Brazilian context and in developing countries. The decision support tool, called TOTAL waste, was applied in different operational arrangements for a target municipality of approximately 500 thousand inhabitants. The results of the application of the tool made it possible to quantify, in each scenario analyzed, the impact over 20 years of different solid waste management strategies on different criteria, such as: operating and investment expenses; number of people needed to operate the services; equivalent carbon dioxide emissions, energy production and consumption, among others. It is concluded that the decision making must be properly aware of the positive and negative results of each analyzed strategy, since no analyzed scenario showed the best performance in all criteria. The best scenario proved to be one where its results are aligned with the attributes to be preferentially adopted in a decision making. This preference cannot be defined without knowing the local economic conditions, the legal environmental demands and the conditions of employment and income.
- Published
- 2021
4. Investigation of animal and algal bioassays for reliable saxitoxin ecotoxicity and cytotoxicity risk evaluation.
- Author
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Perreault F, Matias MS, Melegari SP, Pinto CR, Creppy EE, Popovic R, and Matias WG
- Subjects
- Animals, Aquatic Organisms drug effects, Biological Assay, Cell Line, DNA Methylation drug effects, Ecotoxicology, Photosynthesis drug effects, Photosystem II Protein Complex metabolism, Phytoplankton drug effects, Risk Assessment, Toxicity Tests, Chlamydomonas reinhardtii drug effects, Saxitoxin toxicity
- Abstract
Contamination of water bodies by saxitoxin can result in various toxic effects in aquatic organisms. Saxitoxin contamination has also been shown to be a threat to human health in several reported cases, even resulting in death. In this study, we evaluated the sensitivity of animal (Neuro-2A) and algal (Chlamydomonas reinhardtii) bioassays to saxitoxin effect. Neuro-2A cells were found to be sensitive to saxitoxin, as shown by a 24 h EC50 value of 1.5 nM, which was obtained using a cell viability assay. Conversely, no saxitoxin effect was found in any of the algal biomarkers evaluated, for the concentration range tested (2-128 nM). These results indicate that saxitoxin may induce toxic effects in animal and human populations at concentrations where phytoplankton communities are not affected. Therefore, when evaluating STX risk of toxicity, algal bioassays do not appear to be reliable indicators and should always be conducted in combination with animal bioassays., (Copyright © 2011 Elsevier Inc. All rights reserved.)
- Published
- 2011
- Full Text
- View/download PDF
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