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Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions
Published on: August 15, 2019
Functional changes in culturable microbial communities during a co-composting process: carbon source utilization and
Remy Albrecht1, Claude Périssol, Florence Ruaudel
1Aix-Marseille Université, Institut Méditerranéen d'Ecologie et de Paléoécologie (UMR CNRS IRD), Ecologie Microbienne and Biotechnologies, Case 452, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille Cedex 20, France. remyalbrecht@gmail.com
Waste Management (New York, N.Y.)
|January 12, 2010
Summary
Microbial communities in co-composting adapt their metabolism through two distinct phases: rapid organic matter decomposition followed by humic substance formation. This study tracked bacterial, actinomycete, and fungal populations during composting.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Soil Science
Background:
- Co-composting of sewage sludge and green waste is a vital process for waste management and resource recovery.
- Understanding microbial community dynamics is crucial for optimizing composting efficiency and compost quality.
Purpose of the Study:
- To investigate the microbial community structure and metabolic profiles during sewage sludge and green waste co-composting.
- To correlate microbial activity with changes in organic matter and physicochemical properties throughout the composting process.
Main Methods:
- Culture-dependent methods were used to quantify bacterial, actinomycete, and fungal populations.
- Community Level Physiological Profiles (CLPP) with Biolog Microplates and Principal Component Analysis (PCA) were employed to assess microbial metabolic diversity.
- Physicochemical parameters (C, C/N, OM, FA, HA, pH) and enzyme activities were monitored.
Main Results:
- Microbial populations varied across composting stages: bacteria were abundant throughout, actinomycetes increased after 40 days, and fungi peaked in the decomposition phase.
- CLPP analysis revealed two distinct chronological phases of microbial metabolism, correlating with organic matter transformation.
- The first phase (before 67 days) showed rapid decomposition of biodegradable matter, linked to decreased C, C/N, OM, FA, and enzyme activities.
- The second phase (maturation) was characterized by humic substance formation, correlated with increased HA content, pH, and HA/FA ratio.
Conclusions:
- Microbial communities exhibit distinct metabolic adaptations during co-composting, shifting from readily degradable substrate utilization to complex humic substance formation.
- The study highlights the dynamic interplay between microbial metabolism and the physicochemical transformations driving the co-composting process.
- Findings provide insights into optimizing composting strategies for enhanced humification and stable compost production.
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