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The objective of this research was to study the influence of factors related to the proper management of pig manure (lower dilution) and the season of the year in the progress of the co-composting of pig manure with wood shavings and in the final quality of the compost resulting from the treatments. In the first experiment, two types of swine manure were used: a diluted one (2% Dry Matter - DM), typical from the management usually used in Brazil, and a more concentrated one (6% DM). The manures were incorporated into the wood shavings (6L:1kg) over the course of four weeks. The development of composting was accompanied by monitoring of temperatures inside the piles and the emission of CO2 and CH4 gases during 65 days, including the period of incorporation. The results showed that the diluted manure does not provide the minimum conditions for starting the process. After the incorporation period, any biomass heating was observed and neither the aerobic or anaerobic respiration of the microorganisms, resulting in a compost with low quality. In the second experiment, which evaluated composting in winter and summer during 85 days, it was found that the heat exchange with the environment influences the temperature generated within the piles. The lower temperatures significantly reduced the methanogenesis on the biomass. O presente trabalho buscou estudar a influência de fatores relacionados ao manejo adequado dos dejetos de suínos (redução da diluição) e à sazonalidade, no desempenho da co-compostagem de dejetos de suínos com maravalha e na qualidade final dos compostos resultantes dos tratamentos. No primeiro estudo, foram utilizados dois tipos de dejetos de suínos: um diluído (2% Matéria Seca - MS), típico do manejo usualmente empregado no Brasil, e outro concentrado (6% MS). Os dejetos foram sendo incorporados à maravalha (6 L: 1 kg) no decorrer de 4 semanas. O desenvolvimento da compostagem foi acompanhado através dos monitoramentos das temperaturas no interior das pilhas e da emissão dos gases CO2 e CH4, durante 65 dias, incluindo o período da incorporação. Os resultados demonstraram que o dejeto diluído não fornece as condições mínimas para o desencadeamento do processo, não tendo sido observados o aquecimento da biomassa nem a respiração aeróbia ou anaeróbia dos microrganismos após o período de impregnação, resultando em um composto de baixa qualidade. No segundo estudo, no qual se avaliou a compostagem no inverno e no verão, durante 85 dias, constatou-se que a troca de calor com o ambiente tem influência na temperatura desenvolvida no interior das pilhas. As baixas temperaturas reduzem significativamente a atividade metanogênica na biomassa

The influence of the season of the year and of dilution on the development of swine manure and wood shaves co-composting