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Pilot-scale composting of typical multiple agricultural wastes: Parameter optimization and mechanisms
- Bian, Bo, Hu, Xiuren, Zhang, Shaopeng, Lv, Chengxu, Yang, Zhen, Yang, Weiben, Zhang, Limin
- Bioresource technology 2019 v.287 pp. 121482
- carbon, carbon nitrogen ratio, composting, composts, leaves, organic matter, particle size, poultry manure, rice hulls, vegetables
- In this work, pilot-scale (100 kg of mixed wastes each time) composting of typical agricultural wastes, including chicken manure, vegetable leaves and rice husks with a mass ratio of 6:3:1, was studied. Effects of thermal phases and transformation time on performance, including moisture, nutrient, and carbon contents and C/N ratios of compost, were investigated. The optimal parameters were 75 ± 5 °C and 18 h; the compost met the requirements of Chinese National Agricultural Organic Fertilizer Standard (NY525-2012). Mechanisms investigations demonstrated that, Bacillus and Sinibacillus played key roles in degrading high-molecular-weighted organic substances into small-molecular-weighted humic- and fulvic-acid-like matters, resulting in smaller particle size and loose structure of the product; rice husk particles acted as a conditioning agent and remained their originally morphology. The mechanism provided informative guidance for optimizing the process in practical application.