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Davis College of Agriculture, Natural Resources and Design


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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 −-N) concentrations were significantly lower than the influent concentrations (p < 0.01, n = 38). The NO3 −-N load was significantly correlated with the removal rate (R 2 = 0.96, p < 0.01), but the NH4 + -N load was not correlated with the removal rate (R 2 = 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 (R 2 = 0.96, p < 0.01). The NH4 + -N area rate was correlated with DO (R 2 = 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.

Source Citation

Cui, L., Li, W., Zhang, Y., Wei, J., Lei, Y., Zhang, M., … Ma, W. (2016). Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. Water, 8(11), 514.


© 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license

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