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Succession of bacterial community structure and metabolic function during solid waste decomposition
1Departments of Geology & Geophysics, University of Utah, Salt Lake City, UT 84112, USA.
Bioresource Technology
|August 2, 2019
Summary
Bacterial communities in solid waste decomposition change across aerobic, anaerobic acid, and methanogenic phases. Key factors like nitrogen and pH influence these shifts, impacting overall decomposition processes.
Area of Science:
- Microbiology
- Environmental Science
- Biotechnology
Background:
- Solid waste decomposition is a complex process influenced by microbial communities.
- Understanding bacterial community dynamics is crucial for optimizing waste management strategies.
Purpose of the Study:
- To investigate the bacterial community structure and metabolic functions during different phases of solid waste decomposition.
- To identify key environmental factors shaping these communities and their functions.
Main Methods:
- Illumina MiSeq sequencing was employed to analyze bacterial community structure.
- Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) was used to infer metabolic functions.
- Statistical analyses were performed to determine significant differences and correlations.
Main Results:
- Bacterial diversity and structure significantly differed across the aerobic, anaerobic acid, and methanogenic phases.
- The anaerobic acid phase exhibited significantly higher bacterial richness.
- Proteobacteria, Firmicutes, and Bacteroidetes were dominant phyla, with significant variations between phases.
- Total nitrogen and leachate pH were identified as critical factors influencing bacterial community composition.
- Primary metabolic functions included metabolism, information storage/processing, and cellular processes/signaling.
- Nitrification and denitrification processes were primarily observed in the aerobic (AP) and both aerobic and methanogenic (MP) phases, respectively.
Conclusions:
- Bacterial community structure and function are dynamic throughout solid waste decomposition, varying significantly with each phase.
- Environmental parameters like total nitrogen and pH play a pivotal role in structuring these microbial communities.
- The identified microbial functions and processes provide insights into the biogeochemical transformations occurring during waste decomposition.
Keywords:
Bacterial community diversity and structureMetabolic functionSolid waste decompositionSuccessionMore Related Videos
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