Abstract:A laboratory scale experiment of chicken manure digestion cocomposting was carried out using a reactor system with oxygen monitoring and feedback control. The physiochemical indexes, including temperature, oxygen concentration, volatile solid content (VS), moisture, C/N, pH value, EC, cellulose, hemicellulose, lignin, biological index, and main gas emissions (CH4, NH3 and N2O) were monitored and analyzed, respectively. Physical, chemical and biological indicators presented a good dynamic corresponding relationship, and the degradation of cellulose materials mainly appeared at the middle and later periods of aerobic cocomposting. Temperature and oxygen concentration had an effect on gas emissions: high temperature promoted the emissions of NH3 and N2O with a significantly positive correlation (r=0.378; r=0.695), high temperature and oxygen concentration decreased the emission of CH4 with a significantly negative correlation (r=-0.470; r=-0.494). Gas emissions can be controlled through adjusting the levels of composing oxygen concentration and temperature. Multiparameters characterization and correlation analyses can provide theoretical and methodological basis for process optimization of chicken manure and digestion co-composting. However, characterization and the coordination mechanism should be explored in depth on fermentation performance and gas emissions combining with comprehensive multiindexes during and digestion cocomposting in future studies.
