Tracing sources of ammonium in reducing groundwater in a well field in Hanoi (Vietnam) by means of stable nitrogen isotope (δ15N) values

Norrman, Jenny; Sparrenbom, Charlotte; Berg, Michael; Dang, Duc Nhan; Jacks, Gunnar; Harms-Ringdahl, Peter; Pham, Quy Nhan; Rosqvist, Håkan

doi:10.1016/j.apgeochem.2015.06.009

Cited by 75 publications

(43 citation statements)

References 36 publications

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“…While we find at Nam Du that, due to the high infiltration, the kinetically controlled reductive dissolution of As-containing Fe-oxides only contributes insignificantly to the groundwater arsenic content, the study at Van Phuc suggest that the slow infiltration rates allow much-higher arsenic concentrations to build up in the groundwater. 26 An additional reason for the much-higher arsenic concentrations found in porewater of the shoreface sediment could also be that Van Phuc is located just downstream of the channel at Yen My, which drains most of the untreated urban wastewater from the city of Hanoi into the Red River, 24 providing an ample source of reactive carbon.…”

Section: Results and Discussionmentioning

confidence: 99%

Fate of Arsenic during Red River Water Infiltration into Aquifers beneath Hanoi, Vietnam

Postma

Hòa

Lan

et al. 2016

Environ. Sci. Technol.

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Recharge of Red River water into arsenic-contaminated aquifers below Hanoi was investigated. The groundwater age at 40 m depth in the aquifer underlying the river was 1.3 ± 0.8 years, determined by tritium–helium dating. This corresponds to a vertical flow rate into the aquifer of 19 m/year. Electrical conductivity and partial pressure of CO2 (PCO2) indicate that water recharged from the river is present in both the sandy Holocene and gravelly Pleistocene aquifers and is also abstracted by the pumping station. Infiltrating river water becomes anoxic in the uppermost aquifer due to the oxidation of dissolved organic carbon. Further downward, sedimentary carbon oxidation causes the reduction of As-containing Fe-oxides. Because the release of arsenic by reduction of Fe-oxides is controlled by the reaction rate, arsenic entering the solution becomes highly diluted in the high water flux and contributes little to the groundwater arsenic concentration. Instead, the As concentration in the groundwater of up to 1 μM is due to equilibrium-controlled desorption of arsenic, adsorbed to the sediment before river water started to infiltrate due to municipal pumping. Calculations indicate that it will take several decades of river water infiltration to leach arsenic from the Holocene aquifer to below the World Health Organization limit of 10 μg/L.

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Section: Results and Discussionmentioning

confidence: 99%

Fate of Arsenic during Red River Water Infiltration into Aquifers beneath Hanoi, Vietnam

Postma

Hòa

Lan

et al. 2016

Environ. Sci. Technol.

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“…Li et al [52] found that NH 4 -N can deprotonate to ammonia in conditions with a pH value larger than 6, and the ammonia product can degas, particularly with water temperatures in a range of 19-27 • C. In this study, the pH range was from 6.7 to 8.1 in the groundwater. Under such conditions, NH 4 -N is likely to be degassed by a reaction of NH 4 + (aq)-NH 3 (aq)-NH 3 (g) and emitted from the groundwater to the unsaturated pore space [53].…”

Section: Temporal Variations Of Nitrogen and Cod In Groundwatermentioning

confidence: 99%

Nitrogen and Organics Removal during Riverbank Filtration along a Reclaimed Water Restored River in Beijing, China

Pan

Huang

2018

Water

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Reclaimed water has been widely used to restore rivers and lakes in water scarce areas as well as in Beijing municipality, China. However, refilling the rivers with reclaimed water may result in groundwater pollution. A three-year field monitoring program was conducted to assess the effect of a riverbank filtration (RBF) system on the removal of nitrogen and organics from the Qingyang River of Beijing, which is replenished with reclaimed water. Water samples from the river, sediment, and groundwater were collected for NO 3-N, NH 4-N, and chemical oxygen demand (COD) was measured. The results indicate that about 85% of NO 3-N was removed from the riverbed sediments. Approximate 92% of NH 4-N was removed during the infiltration of water from river to aquifer. On average, 54% of COD was removed by RBF. The attenuation of NO 3-N through RBF to the groundwater varied among seasons and was strongly related to water temperature. On the other hand, no obvious temporal variability was identified in the removal of COD. These results suggest that the RBF system is an effective barrier against NO 3-N, NH 4-N and COD in the Qingyang River, as well as those rivers with similar geological and climatic conditions refilled with reclaimed water.

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“…Generally, under aerobic condition, ammonium-nitrogen (NH 4 + -N) concentration in groundwater is <0.2 mg/L, and it may increase more than ten times under anaerobic environment [4]. The considerably high ammonium groundwater concentrations are indications of anthropogenic contamination from sources such as fertilizer, manure, septic tanks, and sewage [4][5][6]; therefore, these undesirable concentrations need to be removed [7,8]. Additionally, previous research found that high concentration of ammonium in groundwater is significantly correlated with high contents of more dangerous contaminants, which are dissolved iron and manganese [9].…”

Section: Introductionmentioning

confidence: 99%

Potential Sources of Ammonium-Nitrogen in the Coastal Groundwater Determined from a Combined Analysis of Nitrogen Isotope, Biological and Geological Parameters, and Land Use

Rusydi

Onodera

Saito

et al. 2020

Water

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The origin of ammonium-nitrogen in Indonesian coastal groundwater has not been intensively examined, meanwhile the elevated concentration remains a concern. This research aims at tracing the potential sources of ammonium-nitrogen in the groundwater of Indramayu, Indonesia where groundwater is vital for livelihood. From results, a combined examination of nitrogen isotope, coliform bacteria, land-use, and geology confirmed the natural and anthropogenic origins of ammonium-nitrogen in the groundwater. In the brackish-water aquaculture region, groundwater has δ15NNH4 values from +1.8 to +4.8‰ signifying that ammonium-nitrogen is derived from mineralization of organic nitrogen to ammonium. Furthermore, ammonium has a significantly positive relationship with sodium indicating the exchangeable ammonium is mobilized to groundwater via cation exchange. Meanwhile ammonium-nitrogen from anthropogenic waste was detected in agricultural and residential region. The groundwater has more varied δ15NNH4 values, from −2.9 to +16.1‰, which implies attenuation of ammonium-nitrogen from several sources namely manure, mineral fertilizer, sewage, and pit latrines. Also, the presence of E. coli confirms the indication of human and animal waste contamination. However, since ammonium has no relationship with sodium, cation exchange is not feasible and ammonium-nitrogen flows into the groundwater from anthropogenic sources along with liquid wastes.

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Tracing sources of ammonium in reducing groundwater in a well field in Hanoi (Vietnam) by means of stable nitrogen isotope (δ15N) values

Abstract: Tracing sources of ammonium in reducing groundwater in a well field in Hanoi (Vietnam) by means of stable nitrogen isotope (δ15N) values.

Cited by 75 publications

References 36 publications

Fate of Arsenic during Red River Water Infiltration into Aquifers beneath Hanoi, Vietnam

Fate of Arsenic during Red River Water Infiltration into Aquifers beneath Hanoi, Vietnam

Nitrogen and Organics Removal during Riverbank Filtration along a Reclaimed Water Restored River in Beijing, China

Potential Sources of Ammonium-Nitrogen in the Coastal Groundwater Determined from a Combined Analysis of Nitrogen Isotope, Biological and Geological Parameters, and Land Use

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