Preprint Article Version 1 NOT YET PEER-REVIEWED

Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model

Lijuan Cui 1,2,3,* , Wei Li 1,2,3 , Yaqiong Zhang 1,2,3 , Jiaming Wei 1,2,3 , Yinru Lei 1,2,3 , Manyin Zhang 1,2,3 , Xu Pan 1,2,3 , Xinsheng Zhao 1,2,3 , Kai Li 1,2,3 , Wu Ma 4
  1. Institute of wetland research, Chinese academy of forestry, Beijing 100091, China
  2. Beijing Hanshiqiao National Wetland Ecosystem Research Station, Beijing 101399, China
  3. The Beijing Key Laboratory of Wetland Ecological Function and Restoration, Beijing 100091, China
  4. School of Natural Resources, West Virginia University, Morgantown, WV 26506, USA
Version 1 : Received: 25 August 2016 / Approved: 25 August 2016 / Online: 25 August 2016 (08:48:05 CEST)

A peer-reviewed article of this Preprint also exists.

Cui, L.; Li, W.; Zhang, Y.; Wei, J.; Lei, Y.; Zhang, M.; Pan, X.; Zhao, X.; Li, K.; Ma, W. Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. Water 2016, 8, 514. Cui, L.; Li, W.; Zhang, Y.; Wei, J.; Lei, Y.; Zhang, M.; Pan, X.; Zhao, X.; Li, K.; Ma, W. Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. Water 2016, 8, 514.

Journal reference: Water 2016, 8, 514
DOI: 10.3390/w8110514

Abstract

We monitored the water quality and hydrological conditions of a horizontal subsurface constructed wetland (HSSF-CW) in Beijing, China, for 2 years. We simulated the area rate 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 rate 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 (R2=0.9566, p<0.01), but the NH4+-N load was not correlated with the removal rate (R2=0.0187, p>0.01). The area rate constants of NO3-N and NH4+-N at 20 °C were 27.01±26.49 and 16.63±10.58 m∙yr−1, respectively. The temperature coefficients for NO3-N and NH4+-N were estimated at 1.0042 and 0.9604, respectively. The area rate constants for NO3-N and NH4+-N were not correlated with temperature (p>0.01). The NO3-N area rate constant was correlated with the corresponding load (R2=0.9625, p<0.01). The NH4+-N area rate was correlated with DO (R2=0.6922, p<0.01), suggesting that the factors that influenced the N removal rate in this wetland met Liebig's law of the minimum.

Subject Areas

horizontal subsurface flow wetland; N removal; first-order kinetics; model

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