Use of stable nitrogen isotope fractionation to estimate denitrification in small constructed wetlands treating agricultural runoff

Søvik, Anne Kristine; Mørkved, Pål Tore

doi:10.1016/j.scitotenv.2007.11.014

Cited by 62 publications

(31 citation statements)

References 20 publications

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“…In our case, the microbial denitrification accords with a Rayleigh process with calculated enrichment factors of ε = −2.9‰ for 15 N and ε = −1.5‰ for 18 O. It is not uncommon to find such low values in the environment [19,49,50]. The difference in the enrichment value is commonly attributed to different substrate, temperature, denitrification rates, organic matter and biodiversity [46].…”

Section: Nitrate Sources Through Isotopic Composition In Stream Watersupporting

confidence: 62%

Tracing Nitrate-Nitrogen Sources and Modifications in a Stream Impacted by Various Land Uses, South Portugal

Yevenes

Soetaert

Mannaerts

2016

Water

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Abstract:The identification of nitrate-nitrogen (NO 3 -N) origin is important in the control of surface and ground water quality. These are the main sources of available drinking water. Stable isotopes ( 15 N and 18 O) for NO 3 -N and along with a 1-D reactive transport model were used to study the origin and processes that lead to nitrogen transformation and loss in a major stream that flows into a reservoir within an intensively cultivated catchment area (352 km 18 O values in surface water samples from the stream and wells indicated that the dominant NO 3 -N sources were derived mainly from the soil and fertilizers. There was also significant nitrification in surface water at the head of the stream. Sediment pore waters showed high NO 3 -N values near the sediment-water interface (reaching 25 mg·N·L −1 ) and NO 3 -N concentrations sharply decreasing with sediment depth, suggesting significant NO 3 -N consumption. Denitrification was also detected using the 15 N signature in upstream waters, but not downstream where very low NO 3 -N levels were measured. In the stream, the calculated isotopic enrichment factor for NO 3 -N was −2.9‰ for 15 N and −1.78 for 18 O, this indicates that denitrification accounts for 7.8% to 48% of nitrate removal.

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Section: Nitrate Sources Through Isotopic Composition In Stream Watersupporting

confidence: 62%

Tracing Nitrate-Nitrogen Sources and Modifications in a Stream Impacted by Various Land Uses, South Portugal

Yevenes

Soetaert

Mannaerts

2016

Water

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“…However, environmental N pools reflect a mixture of a variety of sources and processes (Hauck 1973), making interpretation of N isotope signatures challenging. A quantitative assessment of denitrification to the overall NO 3 − losses can be made only when nitrification is assumed not to influence 15/14 N in wetland systems (Lund et al 2000;Sovik and Morkved 2008). Therefore, this method is not suitable for estimating denitrification contribution to NO 3 − removal in CWs treating contaminated water, where NH 4 + and/or organic N concentration in inflow are high and the system is partially aerobic (Sovik and Morkved 2007).…”

Section: Introductionmentioning

confidence: 99%

Microbial nitrogen transformation in constructed wetlands treating contaminated groundwater

Coban

Kuschk

Hipsey

et al. 2014

Environ Sci Pollut Res

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Pathways of ammonium (NH4 (+)) removal were investigated using the stable isotope approach in constructed wetlands (CWs). We investigated and compared several types of CWs: planted horizontal subsurface flow (HSSF), unplanted HSSF, and floating plant root mat (FPRM), including spatial and seasonal variations. Plant presence was the key factor influencing efficiency of NH4 (+) removal in all CWs, what was illustrated by lower NH4 (+)-N removal by the unplanted HSSF CW in comparison with planted CWs. No statistically significant differences in NH4 (+) removal efficiencies between seasons were detected. Even though plant uptake accounted for 32-100 % of NH4 (+) removal during spring and summer in planted CWs, throughout the year, most of NH4 (+) was removed via simultaneous nitrification-denitrification, what was clearly shown by linear increase of δ(15)N-NH4 (+) with decrease of loads along the flow path and absence of nitrate (NO3 (-)) accumulation. Average yearly enrichment factor for nitrification was -7.9 ‰ for planted HSSF CW and -5.8 ‰ for FPRM. Lack of enrichment for δ(15)N-NO3 (-) implied that other processes, such as nitrification and mineralization were superimposed on denitrification and makes the stable isotope approach unsuitable for the estimation of denitrification in the systems obtaining NH4 (+) rich inflow water.

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“…The calculated result showed that 79% and 87% of the nitrogen removal were derived from biologic processes in VF1-HSF1 and VF2-HSF2, respectively, in which the latter outperformed those reported in previous studies in other literatures [1,31,32]. Nitrification-denitrificaiton, anaerobic ammonium oxidation (ANAMMOX), and short-cut nitriticationdenitrification were reported to be the contributors to biologic nitrogen removal in constructed wetlands [1][2][3][33][34][35].…”

Section: Nitrogen Removal By Microbesmentioning

confidence: 67%

Enhanced nitrogen removal reliability and efficiency in integrated constructed wetland microcosms using zeolite

Wen

Liu

et al. 2011

Front. Environ. Sci. Eng.

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The purpose of this study is to reduce the seasonal fluctuation and enhance the efficiency of nitrogen removal in vertical flow-horizontal subsurface flow (VF-HSF) constructed wetlands. Two sets of VF-HSF constructed wetlands were built, VF1-HSF1 and VF2-HSF2, and a zeolite section was placed in VF2. The results showed that VF2-HSF2 compared to VF1-HSF1 was not only a more reliable nitrogen removal method, but also enhanced the nitrogen removal efficiency by 50%. The average apparent rate of nitrogen removal in VF2-HSF2 reached to 2.52 gN$m -3 $d -1 , which doubled the rate in VF1-HSF1. Plant uptake and organic nitrogen sediment accounted for 12% and 6% of the total nitrogen removal in VF1-HSF1, respectively, and 10% and 4% in VF2-HSF2, respectively. Biologic nitrogen removal was the dominant mechanism, which accounted for 79% and 87% of the total nitrogen removal in VF1-HSF1 and VF2-HSF2, respectively. Ammonia adsorbed by zeolite during the cold seasons was desorbed, and then nitrified in warm seasons, which resulted in a bioregeneration efficiency of 91%. Zeolite in VF was capable of transferring ammonia from cold seasons to warm seasons as well as enhancing nitrification, which was accompanied by high potential denitrification in HSF that reinforced the efficiency and relieved seasonal fluctuation of nitrogen removal in VF-HSF.

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Use of stable nitrogen isotope fractionation to estimate denitrification in small constructed wetlands treating agricultural runoff

Cited by 62 publications

References 20 publications

Tracing Nitrate-Nitrogen Sources and Modifications in a Stream Impacted by Various Land Uses, South Portugal

Tracing Nitrate-Nitrogen Sources and Modifications in a Stream Impacted by Various Land Uses, South Portugal

Microbial nitrogen transformation in constructed wetlands treating contaminated groundwater

Enhanced nitrogen removal reliability and efficiency in integrated constructed wetland microcosms using zeolite

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