Emissions Control Of Ammonia From The Co-composting Dairy Manure With Rice Straw

The negative influence of compost is ammonia emission, Especially for nitrogen content of higher poultry and animal feces class waste composting. Ammonia is a main component of odor in composting process. Its emission will pollute the air and then affecte human health. The nitrogen is the most major elements that the plant nutrition needs. However, ammonia emission can reduce the nitrogen content of compost product, directly causes the drop of compost quality and affects the agronomic value of the final product. Therefore, the reduction of ammonia emission during composting is required for the application of the composting technology. Ammonia emission in composting process has been recognized and studied in recent years. Although it has done a lot of work about the ammonia emission in composting process, it has not been fully solved.Two strategies, using thermophilic microorganisms to reduce the ammonia emission and developing a bioreactor equipped with sucking aeration system for control the ammonia emission, are proposed and studied in this study. According to these strategies, three parts are included as followings in this study:1) the rules or characteristics of ammonia emission in composting process;2) the effect of thermophilic microorganisms on the ammonia emission in composting process;3) the effect of a bioreactor equipped with sucking aeration system on the control of the ammonia emission.According to our studies, some results are included as followings:(1) The maximum levels of ammonia are usually within the thermophilic range and correlates with the high temperature. About70%of ammonia emission is emitted in high temperature stage of composting process;(2) The thermophilic microorganisms used to adsorb and retain the ammonia can reduce ammonia emission. The ammonia emission in the pile added the thermophilic microorganisms are only23%and lower than that in control (35%).(3) Sucking aeration system can achieve the full collection of NH3and can effectively absorb by the sour in sour absorption system.