Abstract. Composting is one of the more economical and environmentally safe methods of recycling waste generated by the consumer society. Due to the complexity of substrates and intermediate products, microbial diversity and the succession of populations is a prerequisite to ensure complete biodegradation.In the present work, we studied the succession of microbial populations during composting process of organic fraction of Municipal Solid Waste and some physical and chemical parameters were followed during process, moisture content was maintained at 50-60% and temperature monitored daily, in order to study the effects of important environmental factors on microbial communities. The results showed that the substrate was colonized in major proportion by bacteria (44.6%), actinomycetes (32.3 %) and in lower number by fungi (23.1%), mainly represent by the following dominant genera: Bacillus, Streptomyces, Actinomyces, Pseudomonas and Azospirillum. The Multiple Regression Analysis, reveal that the environmental parameter that major influence made on the microbial groups mentioned was the temperature.
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