Critical review of measures and decision support tools for groundwater nitrate management: A surface-to-groundwater profile perspective

Xin, Jia; Wang, Yuan; Shen, Zeliang; Liu, Yang; Wang, Haotong; Zheng, Xilai

doi:10.1016/j.jhydrol.2021.126386

Cited by 54 publications

(20 citation statements)

References 145 publications

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“…The data are expressed as the mean ± standard deviation. As shown in Equation (2). XPS phases were analyzed using the Avantage software (version 5.948, Thermo Fisher Scientific).…”

Section: Methodsmentioning

confidence: 99%

Removal of Nitrate Nitrogen in Groundwater by Attapulgite Loaded with Nano-Zero-Valent Iron

Zhang

Tan

et al. 2023

Adsorption Science & Technology

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Nano-zero-valent iron (nZVI) can be used to remove nitrate nitrogen (NO3-N) from groundwater. However, it has low reduction efficiency owing to its oxidation and aggregation characteristics. Thus, nZVI-loaded material is used to alleviate these drawbacks. In this study, nZVI-coated attapulgite (ATP) was prepared for the removal of NO3-N from groundwater. ATP-nZVI was prepared using the chemical liquid deposition-coreduction method. The prepared materials were characterized by SEM, XRD, and XPS analyses, which confirmed that the aluminum silicate particles in the ATP structure are effective carriers of nZVI and effectively inhibit self-consumption caused by the oxidation and aggregation of nZVI. The batch experiments examined experimental samples containing 30 mg/L nitrate and analyzed the effects of various parameters, including the material, mass ratio, initial pH, initial temperature, and coexisting anions on the NO3-N removal efficiency. The results showed that the optimal removal rate of the composite was 78.61%, which is higher than that using the same amount of ATP, iron powder, and nZVI. When the mass ratio of ATP to nZVI was 1 : 1, the NO3-N removal efficiency was the highest. When the pH value increased from 3 to 9, the NO3-N removal rate decreased, while an increase in the reaction temperature promoted NO3-N removal. The order of the inhibitory effect of coexisting anions on NO3-N removal by various nanoions was PO43–>CO32–>SO42–>Cl–. The adsorption kinetic model fitting results indicated that the chemisorption of electron exchange between ATP and nZVI in NO3-N removal was the main rate-limiting step in the reaction. This study demonstrates the potential of the prepared ATP-nZVI composite for NO3-N removal from groundwater.

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“…The data are expressed as the mean ± standard deviation. As shown in Equation (2). XPS phases were analyzed using the Avantage software (version 5.948, Thermo Fisher Scientific).…”

Section: Methodsmentioning

confidence: 99%

Removal of Nitrate Nitrogen in Groundwater by Attapulgite Loaded with Nano-Zero-Valent Iron

Zhang

Tan

et al. 2023

Adsorption Science & Technology

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“…1,2 Traditionally, NO 3 − -N bioreduction has been widely applied in industrial and municipal wastewater treatment systems. 3 Microbe-mediated NO 3 − -N transformation occurs via two pathways, namely, denitrification (NO 3 − -N → N 2 ) and dissimilatory reduction to ammonium (DNRA, NO 3 − -N → NH 4 + -N). 4 The distribution of these two pathways plays a decisive role in the fate of NO 3 − -N. Therefore, NO 3 − -N transformation to N 2 rather than NH 4 + -N is critical for total nitrogen removal.…”

Section: Introductionmentioning

confidence: 99%

“…In the past few decades, the nitrate nitrogen (NO 3 – -N) produced by human activities has sharply increased, and NO 3 – -N pollution in wastewater has become a global concern due to the negative effects of nitrous oxide emissions and eutrophication. , Traditionally, NO 3 – -N bioreduction has been widely applied in industrial and municipal wastewater treatment systems . Microbe-mediated NO 3 – -N transformation occurs via two pathways, namely, denitrification (NO 3 – -N → N 2 ) and dissimilatory reduction to ammonium (DNRA, NO 3 – -N → NH 4 + -N) .…”

Section: Introductionmentioning

confidence: 99%

Nitrate Bioreduction under Cr(VI) Stress: Crossroads of Denitrification and Dissimilatory Nitrate Reduction to Ammonium

Wang,

Zhao,

Chen

et al. 2023

Environ. Sci. Technol.

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This study explored the response of NO3 –-N bioreduction to Cr(VI) stress, including reduction efficiency and the pathways involved (denitrification and dissimilatory nitrate reduction to ammonium (DNRA)). Different response patterns of NO3 –-N conversion were proposed under Cr(VI) suppress (0, 0.5, 5, 15, 30, 50, and 80 mg/L) by evaluating Cr(VI) dose dependence, toxicity accumulation, bioelectron behavior, and microbial community structure. Cr(VI) concentrations of >30 mg/L rapidly inhibited NO3 –-N removal and immediately induced DNRA. However, denitrification completely dominated the NO3 –-N reduction pathway at Cr(VI) concentrations of <15 mg/L. Therefore, 30 and 80 mg/L Cr(VI) (R4 and R6) were selected to explore the selection of the different NO3 –-N removal pathways. The pathway of NO3 –-N reduction at 30 mg/L Cr(VI) exhibited continuous adaptation, wherein the coexistence of denitrification (51.7%) and DNRA (13.6%) was achieved by regulating the distribution of denitrifiers (37.6%) and DNRA bacteria (32.8%). Comparatively, DNRA gradually replaced denitrification at 80 mg/L Cr(VI). The intracellular Cr(III) accumulation in R6 was 6.60-fold greater than in R4, causing more severe oxidant injury and cell death. The activated NO3 –-N reduction pathway depended on the value of nitrite reductase activity/nitrate reductase activity, with 0.84–1.08 associated with DNRA activation and 1.48–1.57 with DNRA predominance. Although Cr(VI) increased microbial community richness and improved community structure stability, the inhibition or death of nitrogen-reducing microorganisms caused by Cr(VI) decreased NO3 –-N reduction efficiency.

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“…Studies have shown that nitrate pollution of surface and groundwater can occur simultaneously from various sources [Abascal et al, 2022]. This process is multifactorial, difficult to monitor, characterized by prolonged consequences and involves the development of measures as well as decision-making tools to manage water pollution [Jia Xin et al 2021]. Currently, dangerous concentrations of nitrates in water sources are observed in various countries [Shrestha et al, 2016;Adimalla et al, 2019;Roshanravan et al 2021].…”

Section: Introductionmentioning

confidence: 99%

Buffer Effects in Submersed Denitrifying Biofilter

Gevod¹,

Chernova²,

Zhumadulayeva³

et al. 2022

J. Ecol. Eng.

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The high content of nitrates in drinking water leads to serious diseases. The creation of biofiltering devices with the longest time of their operation between preventive flushes is extremely important. The purpose of this study was to investigate the features of the functioning of the developed U-shaped submersible denitrifying biofilter during its long-term operation in the piston filtration mode. The denitrification of water by using the method of displacement (piston) biofiltration in a submersible small U-shaped biofilter with immovable carriers of attached microflora in its filter load was studied. As a result, clogging of the pore space of the biofilter in the zone of excess bacterial nutrition is prevented and the vital activity of bacteria is maintained in places where there is no nutrient substrate. It has been shown that, due to adaptive mechanisms, denitrifying bacteria convert nitrate ions into gaseous nitrogen, consuming extracellular polymeric substances. The rate constants of the reaction of reduction of nitrates to molecular nitrogen in different zones of the biofilter under different filtration modes were determined. The activity of the microflora inside the biofilter quickly returns to its original level when a full-fledged external nutrition is resumed. The efficiency of nitrate to nitrogen conversion in the studied biofilter is 94.2±8.9%.

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Critical review of measures and decision support tools for groundwater nitrate management: A surface-to-groundwater profile perspective

Cited by 54 publications

References 145 publications

Removal of Nitrate Nitrogen in Groundwater by Attapulgite Loaded with Nano-Zero-Valent Iron

Removal of Nitrate Nitrogen in Groundwater by Attapulgite Loaded with Nano-Zero-Valent Iron

Nitrate Bioreduction under Cr(VI) Stress: Crossroads of Denitrification and Dissimilatory Nitrate Reduction to Ammonium

Buffer Effects in Submersed Denitrifying Biofilter

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