Effects of vegetation and hydraulic load on seasonal nitrate removal in treatment wetlands

Bastviken, Sofia Kallner; Weisner, Stefan E. B.; Thiere, Géraldine; Svensson, Jonas; Ehde, Per Magnus; Tonderski, Karin

doi:10.1016/j.ecoleng.2009.01.001

Cited by 69 publications

(37 citation statements)

References 24 publications

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“…Besides, plant productivity could be potentially utilized as carbon source to drive denitrification [20]. Some studies have focused on the treatment of various nitratecontaminated wastewaters using free water surface (FWS) and horizontal subsurface flow (HSSF) CWs [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Chang¹,

Wu²,

Dai³

et al. 2013

Desalination and Water Treatment

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A B S T R A C TNitrate removal rates of two pilot-scale integrated vertical-flow constructed wetlands (IVCWs) treating tail water, under a hydraulic loading rate (HLR) of 250 mm/d with a mean influent NO À 3 -N concentration of 24.4 mg·L À1 , were evaluated. Mean NO À 3 -N removal efficiencies of 15.5 and 18.5% with mass removal rates of 1.01 g·m À2 ·d À1 and 1.16 g·m À2 ·d À1 for IVCW 1 (planted with Canna indica and Pontederia cordata) and 2 (planted with Typha orientalis and Arundo donax var. versicolor), respectively, were achieved. The removal rate constants as fitted by the first-order area-based model averaged 0.046 and 0.055 m·d À1 , respectively. Since NO À 3 -N was the dominant nitrogen form in the effluent, denitrification was the limiting step in nitrogen removal despite of favorable pH and anaerobic conditions in the wetland beds. Low availability of carbon source, high HLR, and low temperature could be the probable influencing factors for the observed low NO À 3 -N removal efficiencies. However, IVCW could be used to treat tail water for nitrate removal at a comparable high loading rate.

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Section: Introductionmentioning

confidence: 99%

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Chang¹,

Wu²,

Dai³

et al. 2013

Desalination and Water Treatment

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“…) (Bastviken et al, 2009). En cambio, por ejemplo Tanner et al (1995a) encontró que tanto la eliminación del N como del P disminuyeron marcadamente al aumentar la carga en los humedales no vegetados, cayendo a un tercio por debajo de los valores obtenidos a cargas equivalentes en humedales vegetados.…”

Section: Las Altas Concentraciones De Nt Y De N-no3unclassified

“…En cambio, en la literatura es común encontrar relaciones entre KNID y/o KNO3 y la temperatura (Bastviken et al, 2009;Kadlec & Knight, 1996;Kadlec, 2005b;Kadlec & Reddy, 2001;Beutel et al, 2009;Abe et al, 2014;Bachand & Horne, 2000b;Kadlec et al, 2010a). En este estudio, se ha visto que la eliminación de N está muy influenciada por la estacionalidad en las concentraciones de entrada y, aunque en menor medida, en las concentraciones de oxígeno disuelto en la columna de agua.…”

Section: Ch (M Añounclassified

“…Mientras se mantenga el suministro de N-NO3 -, y no se agote el suministro de carbono orgánico disponible en el humedal, la desnitrificación debería continuar a la misma tasa (Nichols, 1983). En varios estudios se ha observado una mejora en la eliminación de nitratos al madurar el humedal (mayor acumulación de materia orgánica en los sedimentos) (Craft, 1997; Poe et al, 2003, Borin & Tocchetto, 2007, Bastviken et al, 2009). Mitsch et al (2012) sugirió una eliminación de nitratos más eficiente con el tiempo.…”

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“…No obstante, varios autores han señalado el importante papel que juegan las plantas en el proceso de nitrificación-desnitrificación (Weisner et al, 1994;Gersberg et al, 1986;Bastviken et al, 2009). Además, si la cobertura vegetal en FG no mejora en el futuro, la desnitrificación se podría ver limitada, debido a la reducción en el suministro de carbono orgánico 34 (Gersberg et al, 1983, Weisner et al, 1994, Bachand and Horne, 2000b, Hume et al, 2002, y con ello la eliminación de nitratos por el humedal.…”

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Estudio de los Humedales Artificiales de Flujo Superficial del Tancat de la Pipa como instrumentos para la restauración ambiental del lago de l'Albufera de Valencia

Rajadel¹

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Water quality performance of wetlands receiving nonpoint‐source nitrogen loads: Nitrate and total nitrogen removal efficiency and controlling factors

et al. 2020

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Nonpoint-source nitrogen (N) loads in the U.S. Corn Belt are a major concern both for local impacts on receiving waters and for contributing to hypoxia in the Gulf of Mexico. Nonpoint-source nutrient loads can be ameliorated by a combination of infield and offsite practices, and wetland restoration is a particularly promising approach for reducing N loads from agricultural drainage. However, there is considerable variability among wetlands, and adequate performance data are available for relatively few systems receiving unregulated nonpoint-source loads. We measured N mass balances of 26 restored wetlands receiving a wide range of unregulated, naturally varying hydraulic and nutrient loads to evaluate the N removal performance of these systems and the effects of major factors controlling their performance. Nitrogen loads were primarily in the form of nitrate, and all of the wetlands were effective in reducing both nitrate and total N loads. Nitrate N and total N removal rates averaged 1,500 and 1,440 kg N ha −1 yr −1 , respectively, with the slightly lower total N removal rates reflecting a small net export of reduced N (averaging 66 kg N ha −1 yr −1 ). Average nitrate and total N removal rates were substantially higher than typically reported for Corn Belt wetlands but comparable with highly loaded systems elsewhere. Nitrate removal efficiency ranged from 9 to 92% and was strongly related to hydraulic loading rate and temperature. Results demonstrate the substantial capacity of wetlands to reduce unregulated and highly variable nonpoint-source N loads over a broad range of weather and loading conditions and provide a reasonable basis for predicting average wetland performance based on hydraulic loading rate, temperature, and nitrate concentration.

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Effects of vegetation and hydraulic load on seasonal nitrate removal in treatment wetlands

Cited by 69 publications

References 24 publications

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Estudio de los Humedales Artificiales de Flujo Superficial del Tancat de la Pipa como instrumentos para la restauración ambiental del lago de l'Albufera de Valencia

Water quality performance of wetlands receiving nonpoint‐source nitrogen loads: Nitrate and total nitrogen removal efficiency and controlling factors

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