Turnover and loss of nitrogenous compounds during composting of food wastes |
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Authors: | Yanmei Yang Xiangfeng Zhang Zhifeng Yang Beidou Xi and Hongliang Liu |
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Institution: | (1) College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China;(2) Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China;(3) Chinese Research Academy of Environmental Sciences, Beijing, 100012, China |
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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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Translated from Environmental Science and Technology, 2006, 29(12): 54–56, IV–V 译自: 环境科学与技术] |
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Keywords: | composting nitrogen transformation nitrogen loss ammonia volatilization |
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