Impact factors and mass flow analysis of hydrothermal humification of food waste digestate
The digestate from anaerobic fermentation of food waste has high organic matter content and high potential for fertilization.Compared with traditional composting,using hydrothermal technology to convert organic waste into humic acids has many advantages such as high substrate adaptability and short reaction time,which is conducive to promote the use of digestate as fertilizer in the anaerobic fermentation project of food waste.The present study provided options for the resource utilization of food waste anaerobic digestate as well as a source of feedstock and better process conditions for the production of humic acid-like substances.In this study,the effects of hydrothermal reaction pH and temperature on the yield and characteristics of humic acid and fulvic acid were investigated using anaerobic digestate as feedstock.The highest humic acid yield of 43.31%was achieved at a neutral reaction pH and temperature of 200℃.The humic acid-like products generated were found to have typical humic acid structure by FTIR and 3D-EEM analysis.And the fulvic acid yield was also more than 8%at 180-200℃.Carbon and nitrogen flow analysis showed that the carbon efficiency increased to more than 40%when the reaction temperature reached 200℃,and hydrothermal humification could recover more than 25%of nitrogen through humic acid.
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