![]() Three types of drainfields were simulated: (1) a pipe-and-stone (P&S), (2) advanced soil drainfields, pressurized shallow narrow drainfield (PSND) and (3) Geomat (GEO), a variation of SND. A water content-dependent function was used to compute the nitrification and denitrification rates. Experimental data from a mesocosm-scale study, including soil moisture content, and total N, ammonium (NH 4 +) and nitrate (NO 3 -) concentrations, were used to calibrate the model. We simulated the fate and transport of N in different types of OWTS drainfields, or soil treatment areas (STA) under current and changing climate scenarios, using 2D/3D HYDRUS software. OWTS rely on physical, chemical and biological soil processes to treat wastewater and these processes may be affected by climate change. Nitrogen compounds cause eutrophication, depleting the oxygen in marine ecosystems. ![]() Most of the non-point source nitrogen (N) load in rural areas is attributed to onsite wastewater treatment systems (OWTS). ![]()
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