Abstract
The energy costs of aerobic odour control for pig slurry using present aerators are estimated to be about 14% of the average gross margin per pig produced. Therefore improved aeration efficiency is economically desirable. Reported aerator performance and other experimental data are reviewed to identify the major factors influencing efficiency. Mostly, these show that aeration is less efficient in animal waste slurries than in water. However, a significant minority suggest the reverse, indicating that improvements can be made by increasing specific power dissipation, reducing the dry matter of the slurry by separation and aerating at warmer temperatures by insulating to reduce thermal losses. These factors and others are discussed in detail using specific examples.
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