Overland flow treatment of swine lagoon effluent Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8w32r9255

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  • Effluent from an anaerobic swine manure lagoon was applied at the upper end of six, 100 feet (30.5 m) long by 3 feet (0.9m) wide, grass-covered plots which sloped about 3 percent. The objectives were to measure concentration attenuation and mass reduction of potential pollutants in the wastewater as the result of overland flow, and to examine the influences of experimental variables on the effectiveness of the overland flow wastewater treatment process. Controlled variables included application rate and frequency, and grass species. Seasonal differences in temperature, precipitation, and related physical, chemical and biological conditions were uncontrolled variables. Wastewater and soil horizons were sampled and analyzed at selected plot intervals, and plot runoff volume, air temperature, precipitation, and water table data were recorded. Applied wastewater amounts ranged from 2.0 to 10.8 inches (5,1 to 27.4 cm) per week. Attenuation occurred for oxygen-demanding materials, ammonia nitrogen, phosphorus, total solids, turbidity, salinity, conductivity and fecal coliform bacteria during both cool-wet and warm-dry climatic periods. The concentration of most measured parameters changed linearly with distance of overland flow. Dilution by emerging groundwater (composed partially of wastewater subsequent to plot surface and subsurface treatment) was a major cause for concentration attenuation. Averaged mass reductions of COD, PO₄, and inorganic nitrogen were 47, 40,and 38 percent, respectively, during high application rates, and 72, 78 and 75 percent, respectively, during low application rates. Extractable soil phosphorus, potassium and ammonium concentrations increased greatly during the 13-month investigative period whereas extractable calcium, magnesium and sodium concentrations increased slightly. Alta fescue grass grew well throughout the period of study whereas redtop grass progressively died from the upper to the lower end of the plots during the first five months of operation.
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