Integral approach using bacterial microbiome to stabilize municipal solid waste.

Area of Science:

• Environmental Microbiology
• Waste Management Science
• Biotechnology

Background:

• Biological transformation of municipal solid waste (MSW) offers an eco-friendly approach to managing recalcitrant residues.
• Composting accelerates organic matter transformation, aiding MSW degradation and resource recovery.
• Industrial-scale composting requires precise control over process conditions for optimal outcomes.

Purpose of the Study:

• To characterize the bacterial microbiome in three MSW facilities.
• To elucidate the role of microorganisms in the final product quality of MSW biodegradation.
• To understand microbial community structure, dynamics, and function under real-world conditions.

Main Methods:

• Intensive metagenomic analysis of bacterial communities.
• Physicochemical characterization of waste materials.
• Comparative analysis across three distinct MSW facilities.

Main Results:

• The absence of adequate thermophilic phases correlated with the prevalence of specific bacterial genera, notably Lactobacillus.
• Bacterial biodiversity (abundance and richness) varied across facilities and stages, generally higher during the bio-oxidative phase.
• Despite varied carbon fraction degradation, all treatments achieved significant bio-stabilization of organic matter.

Conclusions:

• Real-world MSW composting conditions provide unprecedented insights into bacterial community behavior.
• Microbial community structure and function are critical for successful MSW bio-stabilization.
• Optimizing thermophilic phases could enhance the efficiency of specific bacterial groups in waste treatment.