RESUMO Este trabalho teve por finalidade analisar o processo de implantação do plano de gerenciamento de resíduos sólidos (PGRS) em um complexo siderúrgico, de modo que se identifiquem possíveis ganhos financeiros associados aos ganhos ambientais. Para atender ao objetivo proposto, foi realizada uma pesquisa qualitativa de cunho descritivo e analítico, adotando a pesquisa-ação como estratégia de pesquisa. Os recursos metodológicos usados foram pesquisas bibliográfica, documental e de campo. Os resultados permitiram levantar e classificar os resíduos gerados pelo complexo, para conhecer sua natureza, legislações pertinentes e métodos de tratamento; acompanhar o processo de implantação do novo plano de tratamento de resíduos; e analisar os impactos financeiros associados aos ganhos ambientais. A análise de indicadores mostrou que, até o ano de 2014, as despesas com o gerenciamento de resíduos eram maiores que as receitas. Já em 2015, com a implantação do PGRS, houve aumento de receitas, provenientes de venda de resíduos recicláveis e redução de custos de tratamento de resíduos, mostrando ser possível, com um trabalho coletivo e focado, atender a legislações ambientais e ainda trazer um retorno financeiro para a empresa.

This paper proposes a novel approach that makes use of continuous-time Markov chains and regret functions to find an appropriate compromise in the context of multicriteria decision analysis (MCDA). This method was an innovation in the relationship between uncertainty and decision parameters, and it allows for a much more robust sensitivity analysis. The proposed approach avoids the drawbacks of arbitrary user-defined and method-specific parameters by defining transition rates that depend only upon the performances of the alternatives. This results in a flexible and easy-to-use tool that is completely transparent, reproducible, and easy to interpret. Furthermore, because it is based on Markov chains, the model allows for a seamless and innovative treatment of uncertainty. We apply the approach to an oil and gas decommissioning problem, which seeks a responsible manner in which to dismantle and deactivate production facilities. The experiments, which make use of published data on the decommissioning of the field of Brent, account for 12 criteria and illustrate the application of the proposed approach.

The recycling of Floating Production Storage and Offloading (FPSO) units has become an important economic and environmental challenge as a growing number of offshore assets reach end-of-life. This study evaluates the comparative economic, environmental, and social performance of alternative FPSO recycling scenarios evaluated using a stochastic Monte Carlo simulation, focusing on five FPSOs that operated in Brazil and were scheduled for recycling either domestically or in Denmark. Twelve performance indicators were aggregated into sustainability indices using a Monte Carlo simulation with 100,000 iterations, enabling analysis of robustness and variability across ten recycling scenarios. The results indicate that Brazilian recycling scenarios (P-32 and P-33) outperform the Danish scenarios in terms of global performance, with Global Sustainability Index values predominantly ranging from 0.59 to 0.75, compared to 0.37 to 0.61 for the Danish cases. Differences in performance are mainly associated with towing distance, cost structure, and emissions. Social indicators show limited variability and act as a stabilizing component across scenarios. Plasma cutting presents slightly better environmental and economic results than LPG cutting, although it does not alter the overall ranking of scenarios. These findings support decision-making on FPSO recycling scenarios by highlighting the role of uncertainty and contextual factors, particularly in emerging recycling markets.

Renewable polyurethane (PU) composites were developed using castor oil and long coir (LCF), ground coir (GCF) or cellulose fiber (CF) at PU/fiber ratios of 50/50, 60/40 and 70/30 wt/wt%, respectively. The aim was to study the influence of natural fibers on composite flexibility via thermogravimetry, differential scanning calorimetry, scanning electron microscopy and water absorption, density, tensile strength, flexural and flammability tests. The set of properties was evaluated (1) subjectively by assigning importance values to the different properties and (2) via multicriteria decision analysis (MCDA). In general, the PU composites with cellulose fiber (PU/CF) exhibited higher thermal degradation temperatures, greater tensile moduli and toughness and less flammability. The composites with the best results for both analysis methods (property set analysis) were PU/CF:60/40 wt/wt% and 70/30 wt/wt%, obtained with cellulose fiber (low lignin content) and the highest PU percentage; these were the most suitable for applications that require flexibility, such as in interior design. When comparing the different coir fiber sizes, the composites containing more long coir fiber (PU/LCF 60/40 wt/wt% and 70/30 wt/wt%) presented the best results. The results of subjective property set analysis were validated using multicriteria analysis, resulting in a simple analysis for application.

This paper compares the sustainable development of fifteen important banks that located, in general, in Brazil, United States, and Europe. The banks were chosen from their market value and analyzed about their investor performances. The bank’s comparison used indicators extracted from their Global Reporting Initiative, which represent their sustainability reports. For the research robustness the decision support multicriteria analysis was used as methodology, which in the application of the method ELECTRE III was possible to verify the ranking of companies according to direct sustainable reports. The results showed a greater commitment of Brazilian banks to sustainable development, while the others, European and American, were shown to have an equivalent performance in many aspects and indicators, specifically about social impacts. The results also demonstrate that in the banking sector, there is still much space for improvements in relation to sustainability. It was concluded that sustainable strategies allied to the Triple Bottom Line are a corporate and operational differential. Thus, it is expected to contribute to the deepening of enterprise policies across all strategic decisions focused on sustainability. Sustainability is the most important aspect for strategy decisions, nowadays, and this application helps for it.