Abstract
Management systems are needed to minimize water quality concerns associated with liquid swine manure fromlarge swine production facilities. Experiments were conducted to investigate the removal of ammoniumN, nitrateN, andtotal phosphorus from liquid swine manure through the use of a soil infiltration and wetland system. Experimental treatmentsapplied directly to the soil infiltration areas included a fullrate application of liquid swine manure, a mixture of 3/4 manureand 1/4 water, and a control application of water only. For three months during both summers of 1998 and 1999, nutrientconcentrations were determined in the infiltration area influent, the infiltration area effluent, and the wetland effluent on aweekly basis. Approximately 93% of the ammoniacal nitrogen (NH3N and NH4N) from the applied swine manure wasremoved by the soil infiltration areas with a corresponding 99% increase in the nitrate nitrogen (NO3N) concentrations werefound. The wetland systems removed 94% of the remaining NH3N and NH4N and 95% of the NO3N. The total P levels weredecreased in the soil infiltration areas and wetlands by 89 and 84%, respectively.
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