Research Progress on Effects of Exogenous Substances on Nitrogen Loss During Organic Solid Waste Aerobic Composting

Abstract:

Aerobic composting is a traditional method for organic solid waste treatment. However， high temperatures， high pH values， and anaerobic conditions during the composting process contributed to severe nitrogen loss in the form of NH₃， N₂O， N₂， which exacerbated the pressure of environmental pollution and reduced the quality of compost products. Biochar， phosphorus magnesium additives， microbial inoculants and other exogenous substances were proved to play a significant role in reducing nitrogen loss in the composting process. It was attributed to nitrogen cycle regulation composting by environment optimization and microbial activity improvement. This paper presents the basic mechanism of nitrogen cycle in aerobic composting. Meanwhile， the recent achievements of physical， chemical and biological additives on controlling nitrogen loss in aerobic composting are summarized. Furthermore， the influence mechanism of exogenous additives on nitrogen transformation and metabolism in composting is elucidated. Finally， the potential in nitrogen cycle path and the interaction between additives and matrix in the future research are prospected.

Key words:nitrogen fixation;aerobic composting;exogenous addition;metabolic pathway;microbiota