Submitted to: American Society of Agronomy Branch Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 1/15/1999
Publication Date: N/A
Technical Abstract: Management of manure on modern swine rearing facilities is a concern as large quantities of animals are confined to a limited land base for manure application. One potential solution to this problem is the use of constructed wetlands for nutrient removal. The objectives of this study are to (1) determine the efficiency of constructed wetlands for N and P removal from lagoon effluent and (2) determine the changes in the various soil P fractions in the wetlands with time. Constructed wetlands were installed at three swine farms in Arkansas. Surface water was collected from lagoon effluent entering the system and treated water exiting the system. Phosphorus concentrations of the water entering the wetlands were 58, 116, and 180 mg P L**-1. The phosphorus concentrations of the water leaving the wetlands were 12, 25, and 10 mg P L**-1, respectively (80, 78, and 94 % reduction in phosphorus concentrations and 57, 79, and 94 % reduction in phosphorus mass). Nitrogen concentrations entering the wetlands were 230, 338, and 289 mg N L**-1. The nitrogen concentrations of the water leaving the wetlands were 20, 39, and 7 mg N L**-1, respectively (91, 89, and 97 % reduction in nitrogen concentrations and 82, 89, and 97 % reduction in nitrogen mass).