Effects of Different Carbon-nitrogen Ratio on the Emission of Ammonia and Greenhouse Gases During the Composting of Garden Waste
[Objective]During the process of garden waste composting,there was the problem of a lot of greenhouse gas(CO2,CH4,N2 O)and ammonia(NH3)emission.In order to provide technical supports for reducing the greenhouse effect and NH3 pollution,an experiment was conducted to study the influences of different C/N ratio on the emission of greenhouse gas and NH3 in the process of garden waste composting.[Method]The chicken manure were added to the garden waste to adjust the C/N ratio of 25,30 and 35.Fourier transform infrared absorption spectrometer was used to monitor the emission of NH3 and greenhouse gas in the composting process.pH,the content of organic carbon and to-tal nitrogen were tested by standard method.[Result]After composting,the compost in the all treatments reached the decay standards.CO2 emission in the composting process of garden waste accounted for the largest proportion of greenhouse effect.There were significant differences in CO2 emission during the composting process among the treatments.The average CO2 emission amount in the treatments of C/N ratio=25,30 and 35 were 5.47,9.32 and 19.19 g/(kg·d).It could be concluded that the greenhouse effect of composting was increased with the in-crease of C/N ratio.The emission amount of NH3 significantly decreased with the increase of C/N ratio,the average emission amount of NH3 in the treatments of C/N ratio=25,30,and 35 were 680.03,442.69 and 193.54 mg/(kg·d),respectively.[Conclusion]During the composting of garden waste,different C/N ratio could significantly affect the emission of greenhouse gas and ammonia,the greenhouse effect increased with the increase of C/N ratio.But the emission of NH3 significantly decreased with the increase of C/N ratio.Therefore,two indi-cators should be taken into comprehensive consideration according to the demands,to determine the C/N ratio during composting.
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