Dry biomethanation of municipal solid waste : state-of-the-art and critical analysis of major technologies.

A utiliza??o da tecnologia de digest?o anaer?bia (biometaniza??o) para a gest?o da fra??o org?nica dos res?duos s?lidos urbanos ? uma realidade que vem se disseminando mundialmente. Os sistemas via seca vem se destacando pela maior robustez do sistema biol?gico e pela minimiza??o da gera??o de efluentes l?quidos. Para avaliar o desempenho de sistemas de digest?o via seca, foram realizadas visitas t?cnicas a plantas das principais tecnologias ? Valorga, Laran, Kompogas e Dranco ? e, a partir de constata??es in loco e de dados levantados junto aos fabricantes, elaborou-se uma metodologia para avalia??o das mesmas, com 35 indicadores, divididos em 4 grupos (Hist?rico; Aspectos Operacionais; Desempenho de Projeto; Desempenho Real). Na soma ponderada, as tecnologias que obtiveram os dois melhores desempenhos foram aquelas denominadas de 4 e 2, respectivamente, que empregam digestor retangular horizontal com agita??o mec?nica por p?s com eixo no sentido transversal ao fluxo do material em digest?o.The employment of anaerobic digestion technology (biomethanation) for the management of the organic fraction of municipal solid waste is a reality that has been spreading out all around the world. The dry biomethanation, in particular, has been highlighted due to its biological system higher robustness and to the low generation of liquid effluents. In order to assess the dry biomethanation technologies performance, technical visits were carried out at different plants representing the major technologies available ? Valorga, Laran, Kompogas, and Dranco ? and, based on in situ observations as well as on projected performance data, it was developed an assessment methodology, composed by 35 indexes, divided into 4 groups: Historic; Operational Aspects; Projected Performance; Real Performance. After all, the best performance was presented by technologies referred to as 4 and 2 that employs rectangular horizontal digesters stirred by impellers with axis across the flux of the digesting material