Uma análise territorial do município do Rio de Janeiro é apresentada com o objetivo de contribuir com o planejamento da coleta seletiva de resíduos sólidos e a tomada de decisão na gestão pública de limpeza urbana. A metodologia aplicada levou em consideração dados primários e secundários do atual sistema de coleta de resíduos sólidos no contexto da geografia metropolitana, cruzando essas informações com os dados de infraestrutura viária, demografia e perfil socioeconômico da população municipal, por meio de ferramentas de geoprocessamento. Estas informações, conjugadas e espacializadas, indicaram que o uso de diferentes modais, conforme as características de cada região, podem otimizar o processo de coleta, reduzindo custos da operação e melhorando a prestação de serviços. Esses resultados corroboram a importância da análise de dados geográficos para a otimização de recursos, eficiência e qualidade dos programas de coleta seletiva, tendo em vista o atendimento à Política Nacional dos Resíduos Sólidos.

Estudo comparativo dos meios de transporte utilizados na coleta seletiva / Comparative study of transport means used in selective collection

This article aims to evaluate the central region of the municipality of Maricá - RJ, from the perspective of Public Transport-Oriented Development - DOT (ITDP, 2024). A territorial cut in the Municipality of Maricá will be presented from the perspective of the five characteristics of the DOT (VTPI, 2019). It is expected to survey the advances in urban mobility, which this city can offer as an example to other Brazilian cities, as well as identify the weak points to be mitigated. The article concludes that the five characteristics of the DOT are partially met in Maricá. It is recommended that future studies evaluate the contrast present in the central region with the other neighborhoods, which have lower population density and less urban attractions. It is expected that this research will encourage the application of the DOT concept in cities, increasing traffic quality and sustainability.

Solid waste management contributes significantly to greenhouse gas (GHG) emissions due to uncontrolled biogas in landfills and the use of fossil fuels in collection and compaction trucks. This study evaluates the feasibility of using biogas generated in landfills as a renewable fuel for these trucks, considering its high calorific value and its potential to reduce both fuel costs and environmental impacts. A qualitative analysis of the benefits and a quantitative evaluation of the potential for biogas production in the Jardim Gramacho landfill, in Rio de Janeiro, were carried out. The results indicate that only 5% of the biogas generated daily could supply the entire fleet of collection trucks, demonstrating the feasibility of this approach.

Electricity is the main source used in the refrigeration process of environments and machines. Global warming and the expansion of the tropical belt increase the demand for refrigeration. The use of so-lar-assisted air conditioning has a great potential, especially in sub-tropical regions with high solar radiation contributing to demand´s fulfillment and reducing electricity from non-renewable sources. It has cooling potential in buildings reducing electricity´s peak demand, ecological footprint reducing carbon emissions and building´s ther-mal load using ecological refrigerants. Also benefits the urban mi-croclimate absorbing solar irradiation into the rooftop. The objective of this article is to survey the factors that influence the selection of components for a solar-assisted cooling system in buildings under different climatic conditions using an exploratory methodology based on the bibliography and on a survey of the state of the art describing the fundamental aspects and components of this technology, its func-tion, and benefits. Non-thermally driven applications were also con-sidered, such as conventional steam compression chiller, driven by electricity and compression cycle by photovoltaic energy. Different cooling systems at full load are compared. The research was applied in a school building in the city of Rio de Janeiro, concluding that so-lar-assisted refrigeration is an energetic and environmentally com-petitive alternative compared to compressors powered by electricity in conventional refrigeration systems.

This article aims to evaluate the economic and environmental efficiency and the impacts on urban traffic of models of door-to-door collection and transportation of recyclable materials, through the analysis of the three models in execution in Brazil, namely: compactor truck, box truck and unmanned combustion engine vehicle, associated with a support point. Due to the scarce literature found related to the transportation of selective collection, this analysis intends to contribute as a subsidy to the decision-making by the agencies and institutions responsible for the management of municipal solid waste and in the planning of the best means of transportation for this purpose, taking into account the local characteristics. The work corroborates the thesis that adequate planning for the optimization of resources, efficiency and quality in the provision of services is fundamental for the implementation and maintenance of selective collection programs, in order to comply with the National Solid Waste Policy.