Research on the formation pattern and structural changes of humic acid during chicken manure composting process
In this study,the formation process of humic substances(HS)and the variation of chemical structure were investigated by the tank high-temperature aerobic composting process with chicken manure and fungus residue as raw materials.The results showed that the chicken manure was treated by canned aerobic composting,the start-up speed of the composting was fast,the overall high temperature duration of the composting was long,the temperature above 50℃lasted for more than 4 days,and the water content decreased rapidly to less than 25%;a large number of proteins,fats and sugars in the material were decomposed and utilized by microorganisms and then reconverted into macromolecular organic matter,composting to the 6th day,the C/N ratio reached 10.10±0.72,and the decomposition process was basically completed;3D-EEM spectrograms showed that fulvic acids were biologically oxidized to generate a more stable humic acid(HA)structure throughout the composting process,but after the 6th day,due to the decrease in the content of small-molecule organic matter,it resulted in the accumulation of fulvic acids.Therefore,the conversion of fulvic acid(FA)to HA can be further promoted by increasing the content of small molecule organic matter at the later stage of composting.
万方数据
维普
