| Effects of C/N ratio on NH3 volatilization loss and nitrogen\|containing organic compounds conversion in aerobic composting |
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| DOI：10.7606/j.issn.1000-7601.2020.02.10 |
| Key Words: NH3 volatilization loss C/N ratio aerobic composting nitrogen\|containing organic conversion |
| Author Name | Affiliation | | ZHOU Haiying | College of Resources and Environmental Science, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agriculture University, Lanzhou, Gansu 730070, China；Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou, Gansu 730070， China | | QIU Huizhen | College of Resources and Environmental Science, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agriculture University, Lanzhou, Gansu 730070, China；Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou, Gansu 730070， China | | YANG Huizhen | College of Resources and Environmental Science, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agriculture University, Lanzhou, Gansu 730070, China；Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou, Gansu 730070， China | | LI Mengchan | College of Resources and Environmental Science, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agriculture University, Lanzhou, Gansu 730070, China；Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou, Gansu 730070， China | | WANG Youling | College of Resources and Environmental Science, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agriculture University, Lanzhou, Gansu 730070, China；Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou, Gansu 730070， China | | ZHANG Chunhong | College of Resources and Environmental Science, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agriculture University, Lanzhou, Gansu 730070, China；Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou, Gansu 730070， China |
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| Abstract: |
| Using the mixture of cattle manure and maize straw with different proportion, an aerobic composting experiment was conducted with five different treatments of C/N ratios (T1=15, T2=20, T3=25, T4=30, and T5=35) under the pile composting conditions. The results showed that loss of total nitrogen(TN) in the composting mainly occurred in the first 24 days of composting, and the rate of TN loss in T1 to T5 treatments were statistically recorded as 10.1%~24.1%. Among them, the proportion of nitrogen loss caused by NH3 volatilization in TN loss reached 30.9%~40.5%. More than 95% of the total NH3 volatilization occurred during the heating stage and the high temperature period in composting,which was the main mean of total nitrogen loss. Ammonium content of each treatment accumulated and reached its maximumon in the first 6 days of composting, leading to a rapid increase in pH, which was the direct cause of the NH3 volatilization during the composting. The lower C/N ratio resulted in the higher pH value, which increased loss as NH3, and the proportion of NH3-N loss to total nitrogen loss. More than 90% of TN in composting materials was the organic nitrogen, and degradation of them occurred in the first 24 days. Lower C/N ratios however promoted faster degradation rate of organic nitrogen. Different components of organic nitrogen showed the different degradation rate, and the amino acid and amide nitrogen contributed much more to accumulation of ammonium. Therefore, when the initial C/N ratio of the heap was lower than 25, a large amount of ammonium nitrogen being produced due to the rapid mineralization of the organic nitrogen, and the resulting rapid increase in pH value of the heap may be the main cause of NH3 volatilization and nitrogen loss in composting. |
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