Abstract
Two compost piles were prepared, using two ventilation systems: forced ventilation and ventilation through mechanical turning. The material to compost was a mixture of orange waste, olive pomace, and grass clippings (2:1:1 v/v). During the composting period (375 days), samples were periodically taken from both piles, and the enumeration of fungi, actinomycetes, and heterotrophic bacteria was carried out. All studied microorganisms were incubated at 25 and 55 °C after inoculation in appropriate growth media. Fungi were dominant in the early stages of both composting processes; heterotrophic bacteria proliferated mainly during the thermophilic stage, and actinomycetes were more abundant in the final stage of the composting process. Our results showed that the physical and chemical parameters: temperature, pH, moisture, and aeration influenced the variation of the microbial population along the composting process. This study demonstrated that composting of these types of wastes, despite the prolonged mesophilic stage, provided an expected microbial variation.
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This work was supported by the project Agro 282 “Hortofruticultura em Agricultura Biológica” - Action DE&E, measure 8, AGRO Program.
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Coelho, L., Reis, M. & Dionísio, L. Variation in microbial population during composting of agro-industrial waste. Appl Microbiol Biotechnol 97, 4179–4186 (2013). https://doi.org/10.1007/s00253-012-4202-1
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DOI: https://doi.org/10.1007/s00253-012-4202-1