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Nitrogen Removal in Laboratory Model Leachfields with Organic-Rich Layers

Department of Civil and Architectural Engineering, 1000 East University Avenue, Department 3295, University of Wyoming, Laramie, WY 82071

View larger version (31K): [in a new window]   Fig. 1. Schematic of deep ground water model, consisting of control and organic layer columns.

View larger version (27K): [in a new window]   Fig. 2. Average N concentration profiles. Comparison between the conventional leachfield model (native soil, control column) and the modified leachfield models (0.3- and 0.9-m organic layer columns). Note "sawdust" refers to a sawdust–sand mix as the organic layer. Hatch marks illustrate the depths of the organic layers in the respective columns. Nitrate and nitrite N values are averaged over the sampling period of October 2001–July 2002 (15–23 samples). Ammonia N values are averaged from March–July 2002 (6 samples) and organic N values were averaged from April–July 2002 (4 samples). Synthetic wastewater was applied from August 2001–August 2002.

View larger version (22K): [in a new window]   Fig. 3. Average total N concentration profiles. Comparison between control and organic layer columns. Nitrate and nitrite N values were averaged over the sampling period of October 2001–July 2002 (11–21 samples). Ammonia N values were averaged from March–July 2002 (5 samples) and organic N values were averaged from April–July 2002 (4 samples). Synthetic wastewater was applied from August 2001–August 2002.