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Turnover and loss of nitrogenous compounds during
composting of food wastes |
| YANG Yanmei1, ZHANG Xiangfeng2, YANG Zhifeng2, XI Beidou3, LIU Hongliang4 |
| 1.College of River and Ocean Engineering, Chongqing Jiaotong University；State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University; 2.State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University; 3.Chinese Research Academy of Environmental Sciences; 4.State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University；Chinese Research Academy of Environmental Sciences |
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Abstract Few people have so far explored into the research of the dynamics of various nitrogenous compounds (including water-soluble nitrogen) in composting of food wastes. This study aimed to investigate the solid-phase nitrogen, water-soluble nitrogen, nitrogen loss together with ammonia volatilization in the process of food wastes composting. A laboratory scale static aerobic reactor in the experiment was employed in the composting process of a synthetic food waste, in which sawdust was used as the litter amendment. In the experiment, oxygen was supplied by continuous forced ventilation for 15 days. The results have shown that the concentrations of total nitrogen and organic nitrogen decrease significantly in the composting process, whereas NH4+-N concentration increases together with little fluctuation in NO3--N. After composting, the total content of the water-soluble nitrogen compounds in the compost greatly increased, the total nitrogen loss amounted to 50% of the initial nitrogen, mainly attributed to ammonia volatilization. 56.7% of the total ammonia volatilization occurred in the middle and late composting of the thermophilic stage. This suggested that the control at the middle and late composting of thermophilic stage is the key to nitrogen loss in the food waste compost.
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Issue Date: 05 June 2008
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