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Insights into enzyme activity and phosphorus conversion during kitchen waste composting utilizing
Taha Ahmed Mohamed1, Junqiu Wu2, Yue Zhao2
1College of Life Science, Northeast Agricultural University, Harbin 150030, China; Soil, Water and Environment Research Institute, Agricultural Research Center, Giza, Egypt.
Bioresource Technology
|August 27, 2022
Summary
Phosphorus-Solubilizing Bacterial (PSB) inoculants enhance kitchen waste composting by improving microbial structure and phosphorus transformation. This leads to increased nutrient content and OM decomposition in the final compost product.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Soil Science
Background:
- Kitchen waste composting is crucial for nutrient recycling.
- Phosphorus availability is often limited in composted materials.
- Phosphorus-Solubilizing Bacteria (PSB) show potential for improving phosphorus cycling.
Purpose of the Study:
- To investigate the impact of PSB inoculant on bacterial structure and phosphorus transformation during kitchen waste composting.
- To elucidate the relationships between phosphorus fractions, enzyme activities, and microbial community dynamics.
- To assess the overall effect of PSB inoculation on compost quality.
Main Methods:
- High-throughput sequencing for microbial community analysis.
- Topological role analysis and network analysis for microbial interactions.
- Measurement of various phosphorus fractions (total, Olsen, citric acid).
- Assessment of organic matter (OM) decomposition and enzyme activities.
- Structural equation modeling (SEM) to determine influencing factors.
Main Results:
- PSB inoculation significantly improved environmental parameters and increased phosphorus fractions (total, Olsen, citric acid).
- Inoculation led to enhanced OM decomposition and increased bacterial diversity.
- Network analysis revealed a more complex microbial community structure with more positive interactions in the inoculated group.
- SEM indicated that pH and enzyme activity directly influenced phosphorus conversion and bacterial structure.
Conclusions:
- Bacterial inoculation effectively improves phosphorus transformation and nutrient content in kitchen waste compost.
- PSB inoculation enhances microbial community complexity and enzyme activity, promoting biological phosphorus cycling.
- This study highlights the potential of PSB as a bio-fertilizer to improve compost quality and nutrient availability.
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