Impact of Titanium Dioxide Nanoparticles on Nutrient and Contaminant Reduction in Wastewater Treatment Wetlands

Abstract

Table 1-List of variables Variable Description C Concentration of a constituent in water t Time u Velocity in the x-direction rxn Reactions associated with a constituent Ca Concentration of a constituent in compartment a Cb Concentration of a constituent in compartment b Ci n Concentration of a constituent in water at timestep n and node i Δt Change in time Δx Distance between two nodes No Concentration of organic nitrogen in water as nitrogen koa Reaction constant describing the transformation of organic nitrogen to ammonia fnitr Nitrification factor describing the slowing of nitrogen transformation with the decrease of dissolved oxygen in the system Na Concentration of ammonia in water as nitrogen ana Mass ratio between nitrogen and chlorophyll-a found in phytoplankton kdeath Rate constant describing phytoplankton death A Concentration of phytoplankton in water, represented by mass of chlorophyll-a in water kai Reaction constant describing the transformation of ammonia to nitrite Ni Concentration of nitrite in water as nitrogen kin Reaction constant describing the transformation of nitrite to nitrate kgrowth Rate constant describing maximum phytoplankton growth ksn Half-saturation constant for nitrogen limitation of phytoplankton growth