Optimization of composting methods for efficient use of cassava waste, using microbial degradation
Xiangning He1, Riyao Cong1, Wei Gao2,3
1School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
Environmental Science and Pollution Research International
|February 22, 2023
Summary
Optimizing cassava residue composting using Bacillus subtilis and Azotobacter chroococcum requires a C/N ratio of 25 and 60% moisture. These conditions ensure effective biodegradation and produce high-quality compost for agricultural applications.
Area of Science:
- Agricultural Science
- Environmental Science
- Microbiology
Background:
- Agricultural solid waste management is crucial for the green economy.
- Cassava residue presents a significant waste stream requiring sustainable utilization.
Purpose of the Study:
- To investigate the effects of C/N ratio, moisture content, and fill ratio on cassava residue compost maturity.
- To determine optimal parameters for efficient cassava residue composting using specific microbial inoculants.
Main Methods:
- Laboratory-scale orthogonal experiment design.
- Inoculation with Bacillus subtilis and Azotobacter chroococcum.
- Analysis of compost maturity indicators (temperature, organic matter degradation, pH, E4/E6, conductivity, germination index) and material characterization (thermogravimetry, SEM, energy spectrum).
Main Results:
- C/N ratio and moisture content significantly impact composting outcomes.
- Optimal parameters identified: C/N ratio of 25, 60% initial moisture, and a fill ratio of 5.
- Achieved rapid thermophilic phase, 36.1% organic matter degradation, pH 7.36, E4/E6 ratio of 1.61, conductivity of 2.52 mS/cm, and 88% germination index.
- Material analysis confirmed effective biodegradation.
Conclusions:
- The recommended process parameters are highly effective for cassava residue composting.
- Optimized composting yields mature, safe compost with significant agricultural value.
- Findings provide a strong reference for industrial-scale cassava residue composting.
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