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Model the evolutionary pattern of N species and pool size in groundwater continuum by utilizing measured source and sink rates of nitrate and ammonium.

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Title: Model the evolutionary pattern of N species and pool size in groundwater continuum by utilizing measured source and sink rates of nitrate and ammonium.
Authors: Han, Li-Li1,2 (AUTHOR), Ge, Lianghao2 (AUTHOR), Tan, Ehui1 (AUTHOR), Zou, Wenbin2 (AUTHOR), Tian, Li2 (AUTHOR), Li, Ping3,4 (AUTHOR), Xu, Min Nina1 (AUTHOR) minxu@hainanu.edu.cn, Kao, Shuh-Ji1,2 (AUTHOR)
Source: Journal of Hazardous Materials. Dec2024, Vol. 480, pN.PAG-N.PAG. 1p.
Subjects: Groundwater remediation, Chemical models, Groundwater pollution, Sewage purification, Nitrogen isotopes, Denitrification, Groundwater purification
Abstract: Nitrate and ammonium are primary nitrogen (N) contaminants in groundwater and effective restoration strategies depend on understanding the interactions of N transformation processes along redox gradients. Utilizing the 15N tracing technique, we assess nitrate removal rates, focusing on denitrification and anammox in a N-rich groundwater of the Hetao Basin, a typical semiarid region in western China. Results showed that N removal rate (0.36–22.01 µM N d−1) was composed mainly of denitrification (73 ± 18 %), with rates increasing from upstream oxidizing environment to downstream reducing areas. In reducing downstream, both denitrification and anammox adhered to substrate-driven Michaelis-Menten kinetics. Integrating data on all source and sink rates of nitrate and ammonium pools (denitrification, anammox, dissimilatory nitrate reduction ammonia, nitrification, mineralization), we constructed a N-transfer-dynamics model based on chemical stoichiometry. This model effectively captured the observed spatial N transfer patterns and highlighted that the balance of oxidants and biodegradable organic N inputs influences N species retention and removal in groundwater. Our combined experimental and modeling approach underscores the importance of reducing organic N and/or adding oxidants to mitigate groundwater N pollution. These findings provide crucial insights for optimizing high N groundwater remediation strategies and potentially inform for wastewater management practices. [Display omitted] • N removal was mainly attributed to denitrification (73 ± 18 %). • N removal rate was influenced by the redox condition and NO 2 –/NO 3 – concentrations. • DON and oxygen supply ratio regulate the retention N species and N removal. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Nitrate and ammonium are primary nitrogen (N) contaminants in groundwater and effective restoration strategies depend on understanding the interactions of N transformation processes along redox gradients. Utilizing the 15N tracing technique, we assess nitrate removal rates, focusing on denitrification and anammox in a N-rich groundwater of the Hetao Basin, a typical semiarid region in western China. Results showed that N removal rate (0.36–22.01 µM N d−1) was composed mainly of denitrification (73 ± 18 %), with rates increasing from upstream oxidizing environment to downstream reducing areas. In reducing downstream, both denitrification and anammox adhered to substrate-driven Michaelis-Menten kinetics. Integrating data on all source and sink rates of nitrate and ammonium pools (denitrification, anammox, dissimilatory nitrate reduction ammonia, nitrification, mineralization), we constructed a N-transfer-dynamics model based on chemical stoichiometry. This model effectively captured the observed spatial N transfer patterns and highlighted that the balance of oxidants and biodegradable organic N inputs influences N species retention and removal in groundwater. Our combined experimental and modeling approach underscores the importance of reducing organic N and/or adding oxidants to mitigate groundwater N pollution. These findings provide crucial insights for optimizing high N groundwater remediation strategies and potentially inform for wastewater management practices. [Display omitted] • N removal was mainly attributed to denitrification (73 ± 18 %). • N removal rate was influenced by the redox condition and NO 2 –/NO 3 – concentrations. • DON and oxygen supply ratio regulate the retention N species and N removal. [ABSTRACT FROM AUTHOR]
ISSN:03043894
DOI:10.1016/j.jhazmat.2024.136046