Aerated static composting is one of the best choices to treat animal wastes. Oxygen is an important factor influencing the composting process. The growth of aerobic microorganism, the composting duration and the quality of final product depend largely on the oxygen concentration in the pile and the oxygen supplying process. In order to control the oxygen concentration and optimize the composting process, it is necessary to study the spatial distribution and variation of oxygen in the composting process.Expe...