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Published on: May 6, 2010
Microbial inoculants and struvite improved organic matter humification and stabilized phosphorus during swine manure
Huanhuan Li1, Tao Zhang1, Sabry M Shaheen2
1Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
Abstract:
The combined effects of microbial inoculants (MI) and magnesium ammonium phosphate (MAP; struvite) on organic matter (OM) biodegradation and nutrients stabilization during biowaste composting have not yet been investigated. Therefore, the effects of MI and MAP on OM stability and P species during swine manure composting were investigated using geochemical and spectroscopic techniques. MI promoted the degradation of carbohydrates and aliphatic compounds, which improved the degree of OM mineralization and humification. MI and MAP promoted the redistribution of P fractions and species during composting. After composting, the portion of water-soluble P decreased from 50.0% to 23.0%, while the portion of HCl-P increased from 18.5% to 33.5%, which mean that MI and MAP can stabilize P and mitigate its potential loss during composting. These findings indicate that MI can be recommended for enhancing OM biodegradation and stabilization of P during biowastes composting, as a novel trial for the biological waste treatment.
Insights
Microbial inoculants (MI) and magnesium ammonium phosphate (MAP) enhance organic matter biodegradation and stabilize phosphorus during biowaste composting. This novel approach improves nutrient management in biological waste treatment.
Area of Science:
- Environmental Science
- Soil Science
- Biotechnology
Background:
- Composting biowastes is crucial for nutrient recycling and waste management.
- The combined effects of microbial inoculants (MI) and magnesium ammonium phosphate (MAP) on organic matter (OM) biodegradation and nutrient stabilization during composting are not well understood.
- Swine manure composting presents challenges in OM stability and phosphorus (P) management.
Purpose of the Study:
- To investigate the effects of MI and MAP on OM stability and P species during swine manure composting.
- To evaluate the potential of MI and MAP to enhance OM biodegradation and P stabilization.
- To assess the impact on P fractions and species transformation.
Main Methods:
- Geochemical techniques were employed to analyze OM and P fractions.
- Spectroscopic techniques were utilized to assess OM composition and stability.
- Composting experiments were conducted using swine manure with MI and MAP treatments.
Main Results:
- MI significantly promoted the degradation of carbohydrates and aliphatic compounds, enhancing OM mineralization and humification.
- Both MI and MAP facilitated the redistribution of P fractions, decreasing water-soluble P from 50.0% to 23.0%.
- The proportion of HCl-P increased from 18.5% to 33.5%, indicating P stabilization and reduced loss potential.
Conclusions:
- MI effectively enhances OM biodegradation and humification during swine manure composting.
- MI and MAP act synergistically to stabilize P, mitigating its loss.
- This study presents a novel biological waste treatment strategy for improved composting outcomes.
