Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/15/1995
Publication Date: N/A
Technical Abstract: An investigation on swine wastewater treatment using constructed wetlands is being carried out in Duplin Co., NC. A free-water-surface-flow constructed wetland system receives wastewater at a N rate of 10 kg/ha/d. The system consists of six 3.6- x 33.5-m wetland cells, and wastewater is applied to three separate sets of two cells each that contain rush/bulrushes, cattails/bur-reed, or soybean and rice. The profile distribution of dissolved nutrients (N,P,C) in the soil and water column for each cell was obtained by using analytical data from samples acquired with diffusion-controlled samplers. Concentration ranges were 25 to 0.3 mg/L for NH4-N, 26 to 0.02 mg/L for NO3-N, 16 to 1.0 mg/L for o-PO4-P, and 100 to 20 mg/L for OC. The accumulation of nutrients in the wetland soils will be discussed regarding the development of aerobic-anaerobic conditions at the soil-floodwater interface and in the root-zone environment.