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Ammonia Volatilization from Dairy Manure under Anaerobic and Aerated Conditions at Different Temperature

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  034148,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13892) @2003
Authors:   B. Zhao, S. Chen
Keywords:   ammonia volatilization, animal manure, dynamic model, nutrient management

NH3 volatilization is the predominant pathway of manure nitrogen loss in the period of treatment or storage prior to land application, and NH3 that enters the atmosphere can adversely impact the environment. Therefore quantifying NH3 volatilization is necessary for management of manure nutrient and protection of the environment. Due to the high variability and complexity of the process, appropriate dynamic mathematical models, calibrated using measured data, are considered effective tools in quantifying the dynamic process of NH3 volatilization. An experiment was conducted for determining NH3 volatilization kinetics from dairy manure under different conditions. Fresh dairy manure was treated under anaerobic and aerated conditions at 5, 20 and 30 C, each with three replicates. The experimental period lasted 60 days. Total kjeldahl nitrogen (TKN), total ammoniacal nitrogen (TAN) and nitrate-N were measured in samples. Sampling frequency varied gradually from daily to once every five days. pH of the manure was measured and dissolved oxygen of liquid manure was monitored during the experimental period. The results showed that pH varied greatly with range from 1.0 to 2.0 units. Aeration increased pH significantly as a result of accelerating CO2 release. The effect of aeration on NH3 volatilization depended on temperature: at 20 oC aeration increased NH3 volatilization by 90 mg N/L compared to anaerobic condition, while it did not affect NH3 volatilization significantly at 5 and 30 oC. The mechanic model, developed by combining different components from different models and calibrated with the measured data, was able to simulate NH3 volatilization with average error less than 7.0%. The information can be used for simulation and controlling NH3 volatilization from animal manure during storage period.

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