The concentrations of malodorous compounds in a 0.4-ha
anaerobic lagoon that received waste from approximately 2000
sows were monitored during the late summer to late fall of 2006. It was found that the increases in the
concentrations of malodorous compounds in the wastewater during the fall were due to reduced degradation by
lagoon bacteria, less wind stripping of volatile compounds from the lagoon surface due to lowering of the lagoon
surface after crop application, and/or reduced evaporation of malodorous compounds due to falling temperatures.