Enhanced methane production via repeated batch bioaugmentation pattern of enriched microbial consortia

Area of Science:

• Biotechnology
• Environmental Microbiology
• Anaerobic Digestion

Background:

• Potato slurry effluents are a potential substrate for biogas production.
• Bioaugmentation can enhance microbial processes in anaerobic digestion.
• Understanding microbial community shifts is crucial for optimizing methane yield.

Purpose of the Study:

• To investigate the impact of enriched microbial consortia (EMC) bioaugmentation on methane production from potato slurry effluents.
• To analyze the effects of different bioaugmentation strategies (one-time vs. repeated batch) on methane yield and production rate.
• To determine the influence of EMC bioaugmentation on the indigenous bacterial community structure.

Main Methods:

• Batch and repeated batch cultivations were employed.
• Bioaugmentation was performed using enriched microbial consortia (EMC).
• DNA sequencing was utilized to analyze bacterial community structure.

Main Results:

• Methane production and bacterial community structure were influenced by EMC/sludge ratio and bioaugmentation patterns.
• Repeated batch bioaugmentation yielded 15% higher methane and 10% increased production rate compared to one-time bioaugmentation.
• Enhanced methane production was linked to increased iron-reducing bacteria and Syntrophomonas persistence, facilitating VFA degradation.

Conclusions:

• Repeated batch bioaugmentation with EMC is more effective for enhancing methane production from potato slurry.
• The study elucidates the relationship between microbial consortia bioaugmentation, community dynamics, and methane generation efficiency.
• Findings provide insights for optimizing anaerobic digestion processes through targeted microbial interventions.