Abstract
With the recent revolution in the green economy, agricultural solid waste resource utilization has become an important project. A small-scale laboratory orthogonal experiment was set up to investigate the effects of C/N ratio, initial moisture content and fill ratio (vcassava residue: vgravel) on the maturity of cassava residue compost by adding Bacillus subtilis and Azotobacter chroococcum. The highest temperature in the thermophilic phase of the low C/N ratio treatment is significantly lower than the medium and high C/N ratios. The C/N ratio and moisture content have a significant impact on the results of cassava residue composting, while the filling ratio only has a significant impact on the pH value and phosphorus content. Based on comprehensive analysis, the recommended process parameters for pure cassava residue composting are a C/N ratio of 25, an initial moisture content of 60%, and a filling ratio of 5. Under these conditions, the high-temperature conditions can be reached and maintained quickly, the organic matter has been degraded by 36.1%, the pH value has dropped to 7.36, the E4/E6 ratio is 1.61, the conductivity value has dropped to 2.52 mS/cm, and the final germination index increased to 88%. The thermogravimetry, scanning electron microscope, and energy spectrum analysis also showed that the cassava residue was effectively biodegraded. Cassava residue composting with this process parameter has great reference significance for the actual production and application of agriculture.
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At the same time, thanks to the members of the research group for their constructive suggestions on essay writing and proofreading.
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This work was funded by Guangxi Innovation Driven Development Project (AA17204067).
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Xiangning He: writing—review and editing, software, writing—original draft preparation. Riyao Cong: conceptualization, formal analysis, validation, writing—review and editing. Wei Gao: funding acquisition, resources, supervision. Xueying Duan: conceptualization, formal analysis, validation, writing—review and editing. Yi Gao: writing—review and editing. Hong Li: writing—review and editing. Zepu Li: writing—review and editing. Hailin Diao: writing—review and editing. Jianju Luo: writing—review and editing.
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He, X., Cong, R., Gao, W. et al. Optimization of composting methods for efficient use of cassava waste, using microbial degradation. Environ Sci Pollut Res 30, 51288–51302 (2023). https://doi.org/10.1007/s11356-023-25818-8
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DOI: https://doi.org/10.1007/s11356-023-25818-8