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- Title
Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model.
- Authors
Lijuan Cui; Wei Li; Yaqiong Zhang; Jiaming Wei; Yinru Lei; Manyin Zhang; Xu Pan; Xinsheng Zhao; Kai Li; Wu Ma
- Abstract
We monitored the water quality and hydrological conditions of a horizontal subsurface constructed wetland (HSSF-CW) in Beijing, China, for two years. We simulated the area-based constant and the temperature coefficient with the first-order kinetic model. We examined the relationships between the nitrogen (N) removal rate, N load, seasonal variations in the N removal rate, and environmental factors?such as the area-based constant, temperature, and dissolved oxygen (DO). The effluent ammonia (NH4+-N) and nitrate (NO3+-NO3) concentrations were significantly lower than the influent concentrations (p < 0.01, n = 38). The NO3--N load was significantly correlated with the removal rate (R2 = 0.96, p < 0.01), but the NH4+-N load was not correlated with the removal rate (R2 = 0.02, p > 0.01). The area-based constants of NO3--N and NH4+-N at 20 ?C were 27 ? 26 (mean ? SD) and 14 ? 10 m·year-1, respectively. The temperature coefficients for NO3--N and NH4+-N were estimated at 1.004 and 0.960, respectively. The area-based constants for NO3--N and NH4+-N were not correlated with temperature (p > 0.01). The NO3--N area-based constant was correlated with the corresponding load (R2 = 0.96, p < 0.01). The NH4+-N area rate was correlated with DO (R2 = 0.69, p < 0.01), suggesting that the factors that influenced the N removal rate in this wetland met Liebig's law of the minimum.
- Subjects
NITROGEN removal (Water purification); SUBSURFACE drainage; WETLAND management; DISSOLVED oxygen in water; AMMONIA; COMPOSITION of water
- Publication
Water (20734441), 2016, Vol 8, Issue 11, p514
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w8110514