Análise das estimativas de emissão de metano por aterros sanitários em projetos de MDL no Brasil.

• Ano de defesa: 2012
• Autor(a) principal: Viana, Thiago Augusto Pimenta
• Orientador(a): Ritter, Elisabeth
• Banca de defesa: Jucá, José Fernando Thomé , Alves, Maria Cristina Moreira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia Ambiental
• Departamento: Centro de Tecnologia e Ciências::Faculdade de Engenharia
• País: BR
• Palavras-chave em Português: Disposição de resíduos sólidos; Mecanismo de desenvolvimento limpo; Gases de efeito estufa; Mercado de emissões; Modelagem de emissão de metano
• Palavras-chave em Inglês: Solid waste disposal; Clean development Mechanism; Greenhouse gases; Emissions trading; Methane emissions modeling
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS
• Link de acesso: http://www.bdtd.uerj.br/handle/1/10904

Most of the Brazilian municipalities find the installation of a Solid Waste Disposal Site a challenge due to the high investment needed. There are some ways to mitigate these costs, including emissions trading. With previous planning, it is possible to burn the methane produced by the decomposition of the waste, resulting in benefits for the landfill by either the simple use of the gas (generating electricity or directly selling the gas) or the revenues from negotiations of emissions certificates. Included in previous planning is the ex-ante estimation of the methane produced by the landfill in order to know beforehand how to make the best use of the biogas and the amount of revenues that can be obtained from this use. When the CDM projects developed in landfills are analyzed, it can be noticed that these estimations generally are poorly made, resulting in estimated values far above the real methane production. This mistake results in a credibility loss by this type of project, since the expected number is rarely achieved. There are some factors that contribute to this difference in values, being operational problems (such as deficiency in the biogas capture and problems in the collection and recirculation of the leachate) and modeling problems (such as the use of input values obtained from experiments in laboratories under different situations from the ones found in Brazilian landfills) the major issues. The present work aims to present and discuss the main problems in estimating ex-ante the methane produced by landfills, using Brazilian CDM projects that are registered and issuing carbon credits as sources to analyze the quality of estimations currently being made. Additionally, experts in landfills and estimations are interviewed in order to obtain different points of view. It is clear that the estimated values, in general, are between 40 and 50% higher than observed during the operation of the landfill. Half of the experts point operational problems as the main contributors, however modeling problems seems to have a decisive influence in estimations. The use of input values must be carefully analyzed and must be used numbers obtained through researches that represent the reality of the landfill in question.