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Becher Quinodoz F, Cabrera A, Blarasin M, Matteoda E, Pascuini M, Prámparo S, Boumaiza L, Matiatos I, Schroeter G, Lutri V, Giacobone D. Chemical and isotopic tracers combined with mixing models for tracking nitrate contamination in the Pampa de Pocho aquifer, Argentina. ENVIRONMENTAL RESEARCH 2024; 259:119571. [PMID: 38972344 DOI: 10.1016/j.envres.2024.119571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 07/01/2024] [Accepted: 07/04/2024] [Indexed: 07/09/2024]
Abstract
In recent years, it has become evident that human activities have significantly disrupted the nitrogen cycle surpassing acceptable environmental thresholds. In this study, chemical and isotopic tracers were combined with a mathematical mass balance model (EMMA), PHREEQC inverse mixing model, and statistical analyses to evaluate groundwater quality, across an area experiencing substantial human activities, with a specific focus on tracing the origin of nitrate (NO3-) with potential water mixing processes. This multi-technique approach was applied to an unconfined aquifer underlying an agricultural area setting in an inter-mountain depression (i.e., the "Pampa de Pocho Plain" in Argentina). Here, the primary identified geochemical processes occurring in the investigated groundwater system include the dissolution of carbonate salts, cation exchange, and hydrolysis of alumino-silicates along with incorporating ions from precipitation. It was observed that the chemistry of groundwater, predominantly of sodium bicarbonate with sulfate water types, is controlled by the area's geology, recharge from precipitation, and stream water infiltration originating from the surrounding hills. Chemical results reveal that 60% of groundwater samples have NO3- concentrations exceeding the regional natural background level, confirming the impact of human activities on groundwater quality. The dual plot of δ15NNO3 versus δ18ONO3 values indicates that groundwater is affected by NO3- sources overlapping manure/sewage with organic-rich soil. The mathematical EMMA model and PHREEQC inverse modeling, suggest organic-rich soil as an important source of nitrogen in the aquifer. Here, 64 % of samples exhibit a main mixture of organic-rich soil with manure, whereas 36 % of samples are affected mainly by a mixture of manure and fertilizer. This study demonstrates the utility of combining isotope tracers with mathematical modeling and statistical analyses for a better understanding of groundwater quality deterioration in situations where isotopic signatures of contamination sources overlap.
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Affiliation(s)
- Fatima Becher Quinodoz
- National Council of Scientific and Technical Research (CONICET), National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina; National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina.
| | - Adriana Cabrera
- National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Monica Blarasin
- National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Edel Matteoda
- National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Miguel Pascuini
- National Council of Scientific and Technical Research (CONICET), National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina; National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Santiago Prámparo
- National Council of Scientific and Technical Research (CONICET), National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina; National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Lamine Boumaiza
- University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, Ontario, N2T 0A4, Canada
| | - Ioannis Matiatos
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 46.7 Km of Athens-Sounio Ave., 19013, Anavissos Attikis, Greece
| | - Germán Schroeter
- National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Verónica Lutri
- National Council of Scientific and Technical Research (CONICET), National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina; National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
| | - Daniela Giacobone
- National Council of Scientific and Technical Research (CONICET), National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina; National University of Río Cuarto, Department of Geology, National Route 36, Km 601, 5800, Río Cuarto, Córdoba, Argentina
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Abidi JH, Elzain HE, Sabarathinam C, El Fehri RM, Farhat B, Ben Mammou A, Waterloo MJ, Yassin MA, Senapathi V. Integrated approach to understand the multiple natural and anthropogenic stresses on intensively irrigated coastal aquifer in the Mediterranean region. ENVIRONMENTAL RESEARCH 2024; 252:118757. [PMID: 38537744 DOI: 10.1016/j.envres.2024.118757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 02/29/2024] [Accepted: 03/19/2024] [Indexed: 04/06/2024]
Abstract
Understanding the major factors influencing groundwater chemistry and its evolution in irrigation areas is crucial for efficient irrigation management. Major ions and isotopes (δD-H2O together with δ18O-H2O) were used to identify the natural and anthropogenic factors contributing to groundwater salinization in the shallow aquifer of the Wadi Guenniche Plain (WGP) in the Mediterranean region of Tunisia. A comprehensive geochemical investigation of groundwater was conducted during both the low irrigation season (L-IR) and the high irrigation season (H-IR). The results show that the variation range and average concentrations of almost all the ions in both the L-IR and H-IR seasons are high. The groundwater in both seasons is characterized by high electrical conductivity and CaMgCl/SO4 and NaCl types. The dissolution of halite and gypsum, the precipitation of calcite and dolomite, and Na-Ca exchange are the main chemical reactions in the geochemical evolution of groundwater in the Wadi Guenniche Shallow Aquifer (WGSA). Stable isotopes of hydrogen and oxygen (δ18O-H2O and δD-H2O) indicate that groundwater in WGSA originated from local precipitation. In the H-IR season, the δ18O-H2O and δD-H2O values indicate that the groundwater experienced noticeable evaporation. The enriched isotopic signatures reveal that the WGSA's groundwater was influenced by irrigation return flow and seawater intrusion. The proportions of mixing with seawater were found to vary between 0.12% and 5.95%, and between 0.13% and 8.42% during the L-IR and H-IR seasons, respectively. Irrigation return flow and the associated evaporation increase the dissolved solids content in groundwater during the irrigation season. The long-term human activities (fertilization, irrigation, and septic waste infiltration) are the main drives of the high nitrate-N concentrations in groundwater. In coastal irrigation areas suffering from water scarcity, these results can help planners and policy makers understand the complexities of groundwater salinization to enable more sustainable management and development.
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Affiliation(s)
- Jamila Hammami Abidi
- Laboratory of Mineral Resources and Environment, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | - Hussam Eldin Elzain
- Water Research Center, Sultan Qaboos University, PO Box 50, AlKhoud 123, Oman.
| | | | - Rihem Mejdoub El Fehri
- Laboratory of Geotechnical Engineering and Georisk, High National School of Engineering of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | - Boutheina Farhat
- Laboratory of Mineral Resources and Environment, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | - Abdallah Ben Mammou
- Laboratory of Mineral Resources and Environment, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | | | - Mohamed A Yassin
- Interdisciplinary Research Center for Membranes and Water Security, KFUPM, 31261, Saudi Arabia; Department of Geosciences, College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
| | - Venkatramanan Senapathi
- PG and Research Department of Geology, National College (Autonomous), Tiruchirappalli - 620001, Tamil Nadu, India
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Matiatos I, Lazogiannis K, Papadopoulos A, Skoulikidis NT, Boeckx P, Dimitriou E. Stable isotopes reveal organic nitrogen pollution and cycling from point and non-point sources in a heavily cultivated (agricultural) Mediterranean river basin. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 901:166455. [PMID: 37607634 DOI: 10.1016/j.scitotenv.2023.166455] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 08/18/2023] [Accepted: 08/18/2023] [Indexed: 08/24/2023]
Abstract
The Pinios River Basin (PRB) is the most intensively cultivated area in Greece, which hosts numerous industries and other anthropogenic activities. The analysis of water samples collected monthly for ∼1 ½ years in eight monitoring sites in the PRB revealed nitrate pollution of organic origin extending from upstream to downstream and occurring throughout the year, masking the signal from the application of synthetic fertilizers. Nitrate concentrations reached up to 3.6 mg/l as NO3--N, without exceeding the drinking water threshold of ∼11.0 mg/l (as NO3--N). However, the water quality status was "poor" or "bad" in ∼50 % of the samples based on a local index, which considers the potential impact of nitrate on aquatic biological communities. The δ15Ν-ΝΟ3- and δ18O-NO3- values ranged from +4.4 ‰ to +20.3 ‰ and from -0.5 ‰ to +14.4 ‰, respectively. The application of a Bayesian model showed that the proportional contribution of organic pollution from industries, animal breeding facilities and manure fertilizers exceeded 70 % in most river sites with an overall uncertainty of ∼0.3 (UI90 index). The δ18O-NO3- and its relationship with δ18O-H2O revealed N-cycling and mixing processes, which were difficult to identify apart from the uptake of nutrients by phytoplankton during the growing season and metabolic activities. The strong correlation of δ15Ν-ΝΟ3- values with a Land Use Index (LUI) and a Point Source Index (PSI) highlighted not only the role of non-point nitrate sources but also of point sources of nitrate pollution on water quality degradation, which are usually overlooked. The nitrification of organic wastes is the dominant nitrate source in most rivers in Europe. The systematic monitoring of rivers for nitrate isotopes will help improve the understanding of N-cycling and the impact of these pollutants on ecosystems and better inform policies for protection measures so to achieve good ecological status.
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Affiliation(s)
- Ioannis Matiatos
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 19013 Anavissos Attikis, Greece.
| | - Konstantinos Lazogiannis
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 19013 Anavissos Attikis, Greece
| | - Anastasios Papadopoulos
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 19013 Anavissos Attikis, Greece
| | - Nikolaos Th Skoulikidis
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 19013 Anavissos Attikis, Greece
| | - Pascal Boeckx
- Isotope Bioscience Laboratory-ISOFYS, Department of Green Chemistry and Technology, Ghent University, Belgium
| | - Elias Dimitriou
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 19013 Anavissos Attikis, Greece
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Boumaiza L, Ben Ammar S, Chesnaux R, Stotler RL, Mayer B, Huneau F, Johannesson KH, Levison J, Knöller K, Stumpp C. Nitrate sources and transformation processes in groundwater of a coastal area experiencing various environmental stressors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 345:118803. [PMID: 37611515 DOI: 10.1016/j.jenvman.2023.118803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 07/28/2023] [Accepted: 08/10/2023] [Indexed: 08/25/2023]
Abstract
In coastal salinized groundwater systems, contamination from various nitrate (NO3) inputs combined with complex hydrogeochemical processes make it difficult to distinguish NO3 sources and identify potential NO3 transformtation processes. Effective field-based NO3 studies in coastal areas are needed to improve the understanding of NO3 contamination dynamics in groundwater of such complex coastal systems. This study focuses on a typical Mediterranean coastal agricultural area, located in Tunisia, experiencing substantial NO3 contamination from multiple anthropogenic sources. Here, multiple isotopic tracers (δ18OH2O, δ2HH2O, δ15NNO3, δ18ONO3, and δ11B) combined with a Bayesian isotope MixSIAR model are used (i) to identify the major NO3 sources and their contributions, and (ii) to describe the potential NO3 transformation processes. The measured NO3 concentrations in groundwater are above the natural baseline threshold, suggesting anthropogenic influence. The measured isotopic composition of NO3 indicates that manure, soil organic matter, and sewage are the potential sources of NO3, while δ11B values constrain the NO3 contamination to manure; a finding that is supported by the results of MixSIAR model revealing that manure-derived NO3 dominates over other likely sources. Nitrate derived from manure in the study area is attributed to organic fertilizers used to promote crop growth, and livestock that deposit manure directly on the ground surface. Evidence for ongoing denitrification in groundwaters of the study area is supported by an enrichment in both 15N and 18O in the remaining NO3, although isotopic mass balances between the measured and the theoretical δ18ONO3 values also suggest the occurrence of nitrification. The simultaneous occurrence of these biogeochemical processes with heterogeneous distribution across the study area reflect the complexity of interactions within the investigated coastal aquifer. The multiple isotopic tracer approach used here can identify the effect of multiple NO3 anthropogenic activities in coastal environments, which is fundamental for sustainable groundwater resources management.
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Affiliation(s)
- Lamine Boumaiza
- University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, Ontario, N2T 0A4, Canada.
| | - Safouan Ben Ammar
- Université de Carthage, Institut Supérieur des Technologies de L'Environnement de L'Urbanisme et de Bâtiment, Tunis, 2035, Tunisia
| | - Romain Chesnaux
- Université Du Québec à Chicoutimi, Département des Sciences Appliquées, Saguenay, Québec, G7H 2B1, Canada
| | - Randy L Stotler
- University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, Ontario, N2T 0A4, Canada
| | - Bernhard Mayer
- University of Calgary, Department of Geoscience, Calgary, Alberta, T2N 1N4 Canada
| | - Frédéric Huneau
- Université de Corse, CNRS UMR 6134 SPE, Département d'Hydrogéologie, Campus Grimaldi BP52, Corte, 20250, France
| | - Karen H Johannesson
- University of Massachusetts Boston, School for the Environment, Boston, MA, 02125, USA
| | - Jana Levison
- University of Guelph, School of Engineering, Morwick G360 Groundwater Research Institute, Guelph, Ontario, N1G 2W1, Canada
| | - Kay Knöller
- Helmholtz Centre for Environmental Research, Department of Catchment Hydrology, Halle, Saale, 06120, Germany
| | - Christine Stumpp
- University of Natural Resources and Life Sciences, Institute of Soil Physics and Rural Water Management, Vienna, 1190, Austria
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Vespasiano G, Cianflone G, Marini L, De Rosa R, Polemio M, Walraevens K, Vaselli O, Pizzino L, Cinti D, Capecchiacci F, Barca D, Dominici R, Apollaro C. Hydrogeochemical and isotopic characterization of the Gioia Tauro coastal Plain (Calabria - southern Italy): A multidisciplinary approach for a focused management of vulnerable strategic systems. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 862:160694. [PMID: 36481154 DOI: 10.1016/j.scitotenv.2022.160694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 11/14/2022] [Accepted: 12/01/2022] [Indexed: 06/17/2023]
Abstract
This work pursues the hydro-geochemical and isotopic characterization of the complex groundwater system of the Gioia Tauro Plain, one of the most important industrialized and agricultural coastal areas of southern Italy. The anthropic pressure exposes the water resources at risk of depletion and quality degradation making the plain groundwater a system of high scientific and social interest. The plain is characterized by a shallow aquifer, mostly recharged by local rains and a deep aquifer apparently less influenced by local precipitation. Both aquifers are mainly Ca-HCO3 waters except for localized sectors where Na-HCO3, Na-Cl and Ca-SO4 waters are present. In deep aquifer, both prolonged interaction with sedimentary rocks, mainly deriving from the erosion of crystalline rocks, and direct cation exchange represent the primary factors controlling the formation of Na-HCO3 waters. Mixing processes between these waters and either connate brine and/or deep thermal waters contribute to the formation of isolated high salinity Na-Cl-rich waters. In shallow aquifer, inputs of N-rich sewage and agriculture-related contaminants, and SOx emissions in proximity of the harbor are responsible of the increasing nitrate and sulphate concentrations, respectively. The Cl/Br and NO3/Cl ratios highlight contamination mainly linked to agricultural activities and contribution of wastewater. Along the northern boundary, the warmest groundwater (Na-Cl[SO4]) were found close to a bend of the main strike-slip fault system, locally favouring the rising of B- and Li-rich deep waters, testifying the influence of geological-structural features on deep water circulation. Despite the high-water demand, a direct marine intrusion is localized in a very restricted area, where we observed an incipient groundwater-seawater mixing (seawater contribution ≤7 %). The qualitative and quantitative conditions of the shallow aquifer still have acceptable levels because of the relatively high recharge inflow. A reliable hydrogeochemical conceptual model, able to explain the compositional variability of the studied waters, is proposed.
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Affiliation(s)
- G Vespasiano
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy; E3 (Earth, Environment, Engineering) Soc. Coop. and Spin-Off of University of Calabria, Via Ponte Bucci, Cubo 15B, 87036 Rende, Italy
| | - G Cianflone
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy; E3 (Earth, Environment, Engineering) Soc. Coop. and Spin-Off of University of Calabria, Via Ponte Bucci, Cubo 15B, 87036 Rende, Italy.
| | - L Marini
- Steam Srl, Via Ponte a Piglieri 8, I-56121 Pisa, Italy
| | - R De Rosa
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy
| | - M Polemio
- CNR-IRPI, National Research Council, Research Institute for Hydrogeological Protection, Via Amendola 122 I, 70126 Bari, Italy
| | - K Walraevens
- Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, Belgium
| | - O Vaselli
- Department of Earth Sciences, University of Florence, Via G. La Pira 4, 50121 Firenze, Italy; CNR-IGG Institute of Geosciences and Earth Resources, Via G. La Pira 4, 50121 Firenze, Italy
| | - L Pizzino
- Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Via di Vigna Murata 605, 00143 Rome, Italy
| | - D Cinti
- Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Via di Vigna Murata 605, 00143 Rome, Italy
| | - F Capecchiacci
- Department of Earth Sciences, University of Florence, Via G. La Pira 4, 50121 Firenze, Italy; CNR-IGG Institute of Geosciences and Earth Resources, Via G. La Pira 4, 50121 Firenze, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli, Osservatorio Vesuviano, Via Diocleziano, 328, 80125 Napoli, NA
| | - D Barca
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy
| | - R Dominici
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy; E3 (Earth, Environment, Engineering) Soc. Coop. and Spin-Off of University of Calabria, Via Ponte Bucci, Cubo 15B, 87036 Rende, Italy
| | - C Apollaro
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy
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Kelepertzis E, Matiatos I, Botsou F, Antonopoulou C, Lappas I, Dotsika E, Chrastný V, Boeckx P, Karavoltsos S, Komárek M. Assessment of natural and anthropogenic contamination sources in a Mediterranean aquifer by combining hydrochemical and stable isotope techniques. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 858:159763. [PMID: 36309271 DOI: 10.1016/j.scitotenv.2022.159763] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/12/2022] [Accepted: 10/23/2022] [Indexed: 06/16/2023]
Abstract
The Atalanti basin is an intensively cultivated area in central Greece, facing groundwater quality deterioration threats due to natural and anthropogenic-related contamination sources. A combination of statistical and hydrogeochemical techniques, and stable isotope compositions (δ2H-H2O and δ18Ο-Η2Ο, δ15Ν-ΝΟ3- and δ18Ο-ΝΟ3-, δ34S-SO42- and δ18O-SO42-) were applied to elucidate the origin of salinity and nitrate contamination, and shed light on the potential associations between geogenic Cr(VI) and NO3- sources and transformations. Nitrate and Cr(VI) concentrations reached up to 337 mg L-1 and 76.1 μg L-1, respectively, exceeding WHO threshold values in places. The cluster of samples with the high salinity was mostly influenced by irrigation return flow and marine aerosols, and less by seawater intrusion, as evidenced by the ionic ratios (e.g., Na+/Cl-) and the stable isotopes of oxygen and hydrogen in water, and sulphur and oxygen in sulphates. The δ15Ν-ΝΟ3- and δ18O-NO3- values ranged from +2.0 ‰ to +14.5 ‰ and + 0.3 ‰ to +11.0 ‰, respectively. We found that the dominant sources of NO3- in groundwater were fertilizers in the central part of the area and sewage waste in the northern part around the residential area of Livanates. The occurrence of denitrification was evident in the northern part of the basin, where the DO levels were lowest (≤ 2.2 mg L-1), whereas nitrification of NH4+-fertilizers prevailed in the central part. Elevated Cr(VI) values (≥ 20 μg/l) were associated with the lowest deviation of the measured from the theoretical nitrification δ18Ο-NO3- values, whereas the lowest Cr(VI) values were observed in the denitrified water samples. Our isotope findings revealed the strong influence of redox conditions on the biogeochemical transformations of N species and the mobilization of Cr(VI) that will help improve the understanding of the fate of these contaminants from the unsaturated zone to the groundwater in areas of agricultural and urban land use.
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Affiliation(s)
- Efstratios Kelepertzis
- Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, Zographou, 15784, Athens, Greece.
| | - Ioannis Matiatos
- Hellenic Centre for Marine Research, 46.7 km of Athens-Sounio Ave., 19013 Anavissos Attikis, Greece
| | - Fotini Botsou
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zographou, 157 84 Athens, Greece
| | - Christina Antonopoulou
- Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, Zographou, 15784, Athens, Greece
| | - Ioannis Lappas
- Ministry of Environment and Energy, General Directorate of Water, Directorate of Protection and Management of Aquatic Environment, Department of Surface and Ground Water, 119 Mesogeion Ave., 115 26 Athens, Greece
| | - Elissavet Dotsika
- Stable Isotope Unit, National Centre for Scientific Research (N.C.S.R.) "Demokritos", Institute of Nanoscience and Nanotechnology, Patriarchou Gregoriou (End) and Neapoleos Street, 15341 Agia Paraskevi, Greece
| | - Vladislav Chrastný
- Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague-Suchdol, Czech Republic
| | - Pascal Boeckx
- Isotope Bioscience Laboratory-ISOFYS, Department of Green Chemistry and Technology, Ghent University, Belgium
| | - Sotirios Karavoltsos
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zographou, 157 84 Athens, Greece
| | - Michael Komárek
- Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague-Suchdol, Czech Republic
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7
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Boumaiza L, Walter J, Chesnaux R, Zahi F, Huneau F, Garel É, Stotler RL, Bordeleau G, Johannesson KH, Vystavna Y, Drias T, Re V, Knöller K, Stumpp C. Combined effects of seawater intrusion and nitrate contamination on groundwater in coastal agricultural areas: A case from the Plain of the El-Nil River (North-Eastern Algeria). THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158153. [PMID: 35988595 DOI: 10.1016/j.scitotenv.2022.158153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 08/08/2022] [Accepted: 08/16/2022] [Indexed: 06/15/2023]
Abstract
This study focuses on coastal aquifers subject to uncontrolled land use development by investigating the combined effects of seawater intrusion and nitrate contamination. The research is undertaken in a Mediterranean coastal agricultural area (Plain of the El-Nil River, Algeria), where water resources are heavily impacted by anthropogenic activities. A multi-tracer approach, integrating hydrogeochemical and isotopic tracers (δ2HH2O, δ18OH2O, δ15NNO3 and δ18ONO3), is combined with a hydrochemical facies evolution diagram, and a Bayesian isotope mixing model (MixSIAR) to assess seawater contamination with its inland intrusion, and distinguish the nitrate sources and their apportionment. Results show that seawater intrusion is circumscribed to the sector neighboring the Mediterranean Sea, with two influencing functions including classic inland intrusion through the aquifer, and upstream seawater impact through the river mouth connected to the Mediterranean Sea. Groundwater and surface water samples reveal nitrate concentrations above the natural baseline threshold, suggesting anthropogenic influence. Results from nitrate isotopic composition, NO3 and Cl concentrations, and the MixSIAR model show that nitrate concentrations chiefly originate from sewage and manure sources. Nitrate derived from the sewage is related to wastewater discharge, whereas nitrate derived from the manure is attributed to an excessive use of animal manure to fertilise agricultural areas. The dual negative impact of seawater intrusion and nitrate contamination degrades water quality over a large proportion of the study area. The outcomes of this study are expected to contribute to effective and sustainable water resources management in the Mediterranean coastal area. Furthermore, this study may improve scientists' ability to predict the combined effect of various anthropogenic stressors on coastal environments and help decision-makers elsewhere to prepare suitable environmental strategies for other regions currently undergoing an early stage of water resources deterioration.
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Affiliation(s)
- Lamine Boumaiza
- Université du Québec à Chicoutimi, Département des Sciences Appliquées, Saguenay, Québec G7H 2B1, Canada; Centre d'études sur les ressources minérales, Groupe de recherche Risque Ressource Eau, Saguenay, Québec G7H 2B1, Canada.
| | - Julien Walter
- Université du Québec à Chicoutimi, Département des Sciences Appliquées, Saguenay, Québec G7H 2B1, Canada; Centre d'études sur les ressources minérales, Groupe de recherche Risque Ressource Eau, Saguenay, Québec G7H 2B1, Canada
| | - Romain Chesnaux
- Université du Québec à Chicoutimi, Département des Sciences Appliquées, Saguenay, Québec G7H 2B1, Canada; Centre d'études sur les ressources minérales, Groupe de recherche Risque Ressource Eau, Saguenay, Québec G7H 2B1, Canada
| | - Faouzi Zahi
- Université Mohammed Seddik Ben Yahia, Département des Sciences de la Terre et de l'Univers, Jijel 18000, Algeria
| | - Frédéric Huneau
- Université de Corse Pascal Paoli, Département d'Hydrogéologie, Campus Grimaldi, Corte 20250, France; CNRS, UMR 6134 SPE, Corte 20250, France
| | - Émilie Garel
- Université de Corse Pascal Paoli, Département d'Hydrogéologie, Campus Grimaldi, Corte 20250, France; CNRS, UMR 6134 SPE, Corte 20250, France
| | - Randy L Stotler
- University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, Ontario N2T 0A4, Canada
| | - Geneviève Bordeleau
- Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, Québec G1K 9A9, Canada
| | - Karen H Johannesson
- University of Massachusetts Boston, School for the Environment, Boston, MA 02125, USA
| | - Yuliya Vystavna
- International Atomic Energy Agency, Isotope Hydrology Section, Vienna 1400, Austria
| | - Tarek Drias
- Université Mustapha Benboulaïd, Département de Géologie, Campus de Fesdiss, 05030 Batna, Algeria
| | - Viviana Re
- University of Pisa, Department of Earth Sciences, Pisa 56126, Italy
| | - Kay Knöller
- Helmholtz Centre for Environmental Research, Department of Catchment Hydrology, Halle, Saale 06120, Germany
| | - Christine Stumpp
- University of Natural Resources and Life Sciences, Institute of Soil Physics and Rural Water Management, Vienna 1190, Austria
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8
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Boumaiza L, Walter J, Chesnaux R, Huneau F, Garel É, Erostate M, Johannesson KH, Vystavna Y, Bougherira N, Bordeleau G, Stotler RL, Blarasin M, Gutiérrez M, Knöller K, Stumpp C. Multi-tracer approach to understand nitrate contamination and groundwater-surface water interactions in the Mediterranean coastal area of Guerbes-Senhadja, Algeria. JOURNAL OF CONTAMINANT HYDROLOGY 2022; 251:104098. [PMID: 36404424 DOI: 10.1016/j.jconhyd.2022.104098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 10/20/2022] [Accepted: 10/21/2022] [Indexed: 06/16/2023]
Abstract
Implementing sustainable groundwater resources management in coastal areas is challenging due to the negative impacts of anthropogenic stressors and various interactions between groundwater and surface water. This study focuses on nitrate contamination and transport via groundwater-surface water exchange in a Mediterranean coastal area (Guerbes-Senhadja region, Algeria) that is heavily affected by anthropogenic activities. A multi-tracer approach, integrating hydrogeochemical and isotopic tracers (δ2HH2O, δ18OH2O, 3H, δ15NNO3 and δ18ONO3), is combined with a Bayesian isotope mixing model (MixSIAR) to (i) elucidate the nitrate sources and their apportionments in water systems, and (ii) describe potential interactions between groundwater and surface water. Results from nitrate isotopic composition and the MixSIAR model show that nitrate concentrations mainly originate from sewage and manure sources. Nitrate derived from the sewage is attributed to urban and rural wastewater discharge, whereas nitrate derived from the manure is related to animal manure used to fertilise agricultural areas. High apportionments of nitrate-based atmospheric precipitation are identified in groundwater and surface water; a finding that is specific to this study. The multi-origin stresses combined with evidence of interactions between surface water and groundwater contribute to negatively impacting large parts of the study coastal area. The outcomes of this study are expected to contribute to sustainable management of coastal ecosystems by drawing more attention towards groundwater use and protection. Furthermore, this study may improve scientists' ability to predict the behavior of anthropogenically impacted coastal ecosystems and help decision-makers elsewhere to prepare suitable environmental strategies for other coastal ecosystems currently undergoing an early stage of groundwater resources deterioration.
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Affiliation(s)
- Lamine Boumaiza
- University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, Ontario N2T 0A4, Canada.
| | - Julien Walter
- Université du Québec à Chicoutimi, Département des Sciences Appliquées, Saguenay, Québec G7H 2B1, Canada; Centre d'études sur les ressources minérales, Groupe de recherche Risque Ressource Eau, Saguenay, Québec G7H 2B1, Canada
| | - Romain Chesnaux
- Université du Québec à Chicoutimi, Département des Sciences Appliquées, Saguenay, Québec G7H 2B1, Canada; Centre d'études sur les ressources minérales, Groupe de recherche Risque Ressource Eau, Saguenay, Québec G7H 2B1, Canada
| | - Frédéric Huneau
- Université de Corse Pascal Paoli, Département d'Hydrogéologie, Campus Grimaldi, Corte 20250, France; CNRS, UMR 6134 SPE, Corte 20250, France
| | - Émilie Garel
- Université de Corse Pascal Paoli, Département d'Hydrogéologie, Campus Grimaldi, Corte 20250, France; CNRS, UMR 6134 SPE, Corte 20250, France
| | - Mélanie Erostate
- Université de Corse Pascal Paoli, Département d'Hydrogéologie, Campus Grimaldi, Corte 20250, France; Institution Adour, Service gestion intégrée - Mission nappes profondes, Mont-de-Marsan 40000, France
| | - Karen H Johannesson
- University of Massachusetts Boston, School for the Environment, Boston, MA 02125, USA
| | - Yuliya Vystavna
- International Atomic Energy Agency, Isotope Hydrology Section, Vienna 1400, Austria
| | - Nabil Bougherira
- Université Badji Mokhtar, Département de Géologie, Campus de Sidi-Amar, Annaba 23005, Algeria
| | - Geneviève Bordeleau
- Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, Québec G1K 9A9, Canada
| | - Randy L Stotler
- University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, Ontario N2T 0A4, Canada
| | - Mónica Blarasin
- Universidad Nacional de Río Cuarto, Departamento de Geología, Río Cuarto, Córdoba X5804BYA, Argentina
| | - Mélida Gutiérrez
- Missouri State University, Department of Geography, Geology and Planning, Springfield, MO 65897, USA
| | - Kay Knöller
- Helmholtz Centre for Environmental Research, Department of Catchment Hydrology, Halle (Saale) 06120, Germany
| | - Christine Stumpp
- University of Natural Resources and Life Sciences, Institute of Soil Physics and Rural Water Management, Vienna 1190, Austria
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9
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Zendehbad M, Mostaghelchi M, Mojganfar M, Cepuder P, Loiskandl W. Nitrate in groundwater and agricultural products: intake and risk assessment in northeastern Iran. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:78603-78619. [PMID: 35691946 PMCID: PMC9587111 DOI: 10.1007/s11356-022-20831-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 05/11/2022] [Indexed: 05/04/2023]
Abstract
The suitability of groundwater and agricultural products for human consumption requires determining levels and assessing the health risks associated with potential pollutants. Here, particularly pollution with nitrate still remains a challenge, especially for those urban areas suffering from insufficient sewage collection systems, resulting in contaminating soil, endangering food safety, and deteriorating drinking water quality. In the present study, nitrate concentrations in the commonly consumed fruit and vegetable species were determined, and the results, together with the groundwater nitrate levels, were used to assess the associated health risks for Mashhad city residents. For this assessment, 261 water samples and 16 produce types were used to compute the daily intake of nitrate. Nitrate in groundwater was analyzed using a spectrophotometer, and produce species were examined using High-Performance Liquid Chromatography. Ward's hierarchical cluster analysis was applied for categorizing produce samples with regard to their nitrate content. Additionally, to account for the sanitation hazards associated with groundwater quality for drinking purposes, total coliform and turbidity were also assessed using the membrane filter (MF) technique and a nephelometer, respectively. Nitrate concentrations exceeded the prescribed permissible limits in 42% of the groundwater wells. The outcomes also exhibit significantly higher nitrate accumulation levels in root-tuber vegetables and leafy vegetables compared to fruit vegetables and fruits. Using cluster analysis, the accumulation of nitrate in vegetables and fruits was categorized into four clusters, specifying that radish contributes to 65.8% of the total content of nitrate in all samples. The Estimated Daily Intake (EDI) of nitrate and Health Risk Index (HRI) associated with consumption of groundwater exceeded the prescribed limit for the children's target group in Mashhad's south and central parts. Likewise, EDI and HRI values for produce consumption, in most samples, were found to be in the tolerable range, except for radish, lettuce, and cabbage, potentially posing risks for both children and adult consumers. The total coliforms in groundwater were found to violate the prescribed limit at 78.93% of the sampling locations and were generally much higher over the city's central and southern areas. A relatively strong correlation (R2 = 0.6307) between total coliform and nitrate concentrations suggests the release of anthropogenic pollution (i.e., sewage and manure) in the central and southern Mashhad.
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Affiliation(s)
- Mohammad Zendehbad
- University of Natural Resources and Life Sciences, Vienna, Department of Water, Atmosphere and Environment, Institute of Soil Physics and Rural Water Management, Muthgasse 18, 1190 Vienna, Austria.
| | - Majid Mostaghelchi
- University of Vienna, Faculty of Geosciences, Geography and Astronomy, Department of Mineralogy and Crystallography, UZA 2, Althanstraße 14, 1090, Vienna, Austria
| | - Mohsen Mojganfar
- Ferdowsi University of Mashhad, Faculty of Science, Department of Geology, Azadi Square, Mashhad, Iran
| | - Peter Cepuder
- University of Natural Resources and Life Sciences, Vienna, Department of Water, Atmosphere and Environment, Institute of Soil Physics and Rural Water Management, Muthgasse 18, 1190 Vienna, Austria
| | - Willibald Loiskandl
- University of Natural Resources and Life Sciences, Vienna, Department of Water, Atmosphere and Environment, Institute of Soil Physics and Rural Water Management, Muthgasse 18, 1190 Vienna, Austria
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10
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Boumaiza L, Walter J, Chesnaux R, Stotler RL, Wen T, Johannesson KH, Brindha K, Huneau F. Chloride-salinity as indicator of the chemical composition of groundwater: empirical predictive model based on aquifers in Southern Quebec, Canada. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:59414-59432. [PMID: 35386077 DOI: 10.1007/s11356-022-19854-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 03/18/2022] [Indexed: 06/14/2023]
Abstract
The present study first describes the variations in concentrations of 12 chemical elements in groundwater relative to salinity levels in Southern Quebec (Canada) groundwater systems, and then uses this data to develop an empirical predictive model for evaluating groundwater chemical composition relative to salinity levels. Data is drawn from a large groundwater chemistry database containing 2608 samples. Eight salinity classes were established from lowest to highest chloride (Cl) concentrations. Graphical analyses were applied to describe variations in major, minor, and trace element concentrations relative to salinity levels. Results show that the major elements were found to be dominant in the lower salinity classes, whereas Cl becomes dominant at the highest salinity classes. For each of the major elements, a transitional state was identified between domination of the major elements and domination of Cl. This transition occurred at a different level of salinity for each of the major elements. Except for Si, the minor elements Ba, B, and Sr generally increase relative to the increase of Cl. The highest Mn concentrations were found to be associated with only the highest levels of Cl, whereas F was observed to be more abundant than Mn. Based on this analysis of the data, a correlation table was established between salinity level and concentrations of the chemical constituents. We thus propose a predictive empirical model, identifying a profile of the chemical composition of groundwater relative to salinity levels, to help homeowners and groundwater managers evaluate groundwater quality before resorting to laborious and costly laboratory analyses.
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Affiliation(s)
- Lamine Boumaiza
- Département Des Sciences Appliquées, Université du Québec À Chicoutimi, Saguenay, QC, G7H 2B1, Canada.
- Centre d'études Sur Les Ressources Minérales, Groupe de Recherche Risque Ressource Eau, Université du Québec À Chicoutimi, Saguenay, QC, G7H 2B1, Canada.
| | - Julien Walter
- Département Des Sciences Appliquées, Université du Québec À Chicoutimi, Saguenay, QC, G7H 2B1, Canada
- Centre d'études Sur Les Ressources Minérales, Groupe de Recherche Risque Ressource Eau, Université du Québec À Chicoutimi, Saguenay, QC, G7H 2B1, Canada
| | - Romain Chesnaux
- Département Des Sciences Appliquées, Université du Québec À Chicoutimi, Saguenay, QC, G7H 2B1, Canada
- Centre d'études Sur Les Ressources Minérales, Groupe de Recherche Risque Ressource Eau, Université du Québec À Chicoutimi, Saguenay, QC, G7H 2B1, Canada
| | - Randy L Stotler
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, N2T 0A4, Canada
| | - Tao Wen
- Department of Earth and Environmental Sciences, Syracuse University, Syracuse, NY, 13244, USA
| | - Karen H Johannesson
- School for the Environment, University of Massachusetts Boston, Boston, MA, 02125, USA
| | - Karthikeyan Brindha
- Hydrogeology Group, Institute of Geological Sciences, Freie Universität Berlin, 12249, Berlin, Germany
| | - Frédéric Huneau
- Département d'Hydrogéologie, Université de Corse Pascal Paoli, Campus Grimaldi, 20250, Corte, France
- UMR 6134, SPE, CNRS, BP 52, 20250, Corte, France
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11
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An Integrated Approach for Investigating the Salinity Evolution in a Mediterranean Coastal Karst Aquifer. WATER 2022. [DOI: 10.3390/w14111725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Coastal areas are characterized by considerable demographic pressure that generally leads to groundwater overexploitation. In the Mediterranean region, this situation is exacerbated by a recharge reduction enhanced by climate change. The consequence is water table drawdown that alters the freshwater/seawater interface facilitating seawater intrusion. However, the groundwater salinity may also be affected by other natural/anthropogenic sources. In this paper, water quality data gathered at 47 private and public wells in a coastal karst aquifer in Apulia (southern Italy), were interpreted by applying disparate methods to reveal the different sources of groundwater salinity. Chemical characterization, multivariate statistical analysis, and mixing calculations supplied the groundwater salinization degree. Characteristic ion ratios, strontium isotope (87Sr/86Sr), and pure mixing modelling identified the current seawater intrusion as a main salinity source, also highlighting the contribution of water–rock interaction to groundwater composition and excluding influence from Cretaceous paleo-seawater. Only the combined approach of all the methodologies allowed a clear identification of the main sources of salinization, excluding other less probable ones (e.g., paleo-seawater). The proposed approach enables effective investigation of processes governing salinity changes in coastal aquifers, to support more informed management.
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12
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Elmeknassi M, Bouchaou L, El Mandour A, Elgettafi M, Himi M, Casas A. Multiple stable isotopes and geochemical approaches to elucidate groundwater salinity and contamination in the critical coastal zone: A case from the Bou-areg and Gareb aquifers (North-Eastern Morocco). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 300:118942. [PMID: 35134425 DOI: 10.1016/j.envpol.2022.118942] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 12/13/2021] [Accepted: 01/30/2022] [Indexed: 06/14/2023]
Abstract
Mediterranean areas are characterized by complex hydrogeological systems, where water resources are faced with several issues such as salinity and pollution. Fifty-one water samples were gathered from the Bou-areg coastal and the Gareb aquifers to evaluate the source of water salinity and to reveal the processes of the different sources of pollution using a variety of chemical and isotopic indicators (δ2H-H2O, δ18O-H2O, δ34S-SO4, and δ18O-SO4). The results of the hydrochemical analysis of water samples show that the order of dominated elements is Cl- > HCO3- > SO42- > NO3- and Na+ > Ca2+ > Mg2+ > K+ and evidenced extremely high salinity levels (EC up to 22000 μS/cm). All samples exceeded the WHO drinking water guidelines, making them unfit for human consumption. Ion ratio diagrams, isotopic results, and graphical comparing indicate that the mineralization of groundwater in the area, is controlled by carbonate dissolution, evaporite dissolution, ion exchange, and sewage invasion. The return of irrigation water plays a significant role as well in the groundwater recharge and its mineralization by fertilizers mainly. Evaporites (Gypsum), sewage, and fertilizers constitute the main sources of sulfates in the investigated water resources. These scientific results will be an added value for decision-makers to more improve the sustainable management of groundwater in water-stressed regions. The use of chemical and isotopic tracers once again shows their relevance in such zones where systematic monitoring is lacking.
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Affiliation(s)
- Malak Elmeknassi
- GeoSciencesSemlalia Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh, 40000, Morocco.
| | - Lhoussaine Bouchaou
- Applied Geology and Geo-Environment Laboratory, Faculty of Sciences, Ibn Zohr University, Agadir, 80000, Morocco; Mohammed VI Polytechnic University, International Water Research Institute, Benguerir, 43150, Morocco
| | - Abdennabi El Mandour
- GeoSciencesSemlalia Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh, 40000, Morocco; Mohamed VI Museum for the Civilization of Water in Morocco, Ministry of Habous and Islamic Affairs, Marrakesh, 40000, Morocco
| | - Mohammed Elgettafi
- Mohamed First University Multidisciplinary Faculty of Nador, LCM2E Lab Géo-Environnement et Santé, BP 300 Selouane, 62702, Morocco
| | - Mahjoub Himi
- Earth Sciences Faculty, University of Barcelona, Marti i Franquès, s/n, 08028, Barcelona, Spain
| | - Albert Casas
- Earth Sciences Faculty, University of Barcelona, Marti i Franquès, s/n, 08028, Barcelona, Spain
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13
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An Integrated Approach for Deciphering Hydrogeochemical Processes during Seawater Intrusion in Coastal Aquifers. WATER 2022. [DOI: 10.3390/w14071165] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
For managing the freshwater in the worldwide coastal aquifers, it is imperative to understand the hydrogeochemical processes and flow patterns in the mixing freshwater/saltwater zone. The Egyptian Nile Delta aquifer is a typical example. The management of seawater intrusion (SWI) requires detailed investigations of the intrusion wedge and the dynamic processes in the mixing zone. Thus, a multidisciplinary approach was applied based on holistic hydrogeochemical, statistical analysis, and DC resistivity measurements to investigate the lateral and vertical changes in groundwater characteristics undergoing salinization stressor. The results of cross plots and ionic deviations of major ions, hydrochemical facies evolution diagram (HFE-D), and seawater mixing index (SMI) were integrated with the resistivity results to show the status of the SWI where the intrusion phase predominates in ~2/3 of the study are (~70 km radius) and the compositional thresholds of Na, Mg, Cl, and SO4 are 600, 145, 1200, and 600 mg/L, respectively, indicating that the wells with higher concentrations than these thresholds are affected by SWI. Moreover, the results demonstrate the efficiency of combining hydrogeochemical facies from heatmap and resistivity investigations to provide a large-scale characterization of natural and anthropogenic activities controlling aquifer salinization to support decision-makers for the long-term management of coastal groundwater.
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14
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Abd-Elaty I, Shahawy AEL, Santoro S, Curcio E, Straface S. Effects of groundwater abstraction and desalination brine deep injection on a coastal aquifer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 795:148928. [PMID: 34328916 DOI: 10.1016/j.scitotenv.2021.148928] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/15/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
As a result of climate change, population increase and improvement of living standards, the water demand is annually growing drawing worldwide attention on seawater desalination to face water crisis. The total global desalination capacity is dominated by Reverse Osmosis (RO) and, often, this desalination process is fed with the brackish water extracted from coastal aquifers. After this process the desalted freshwater is obtained at a recovery factor of ca. 50%, while concentrate byproduct, named brine, is disposed back to coastal aquifers, seas, oceans or evaporative ponds, determining detrimental effects on the surrounding environment. A common approach to clean out the brine is the deep-well injection into coastal aquifers, exacerbating the seawater intrusion. The ultimate result is a reduction of the available water both in terms quantity and quality hampering the benefits of the desalination. The aim of this study is to investigate the effects of brine water injection in the Nile coastal aquifer, one of the largest underground freshwater reservoirs in the world, and to find a way to minimize and manage the environmental impact of the RO process. In order to simulate the effects of the brackish water extraction and the brine deep-injection on the Nile coastal aquifer, a combined seawater intrusion, numerical models for flow and salt transport model in aquifers and the solution-diffusion in RO practices were implemented. Different management scenarios were considered and their consequences on salt mass storage in the Nile coastal aquifer evaluated. According to the numerical results, the salinization of the coastal aquifer can be mitigated by reducing the concentration of the water feeding the reverse osmosis plant, i.e., mixing the extracted brackish water with a lower salinity water. Besides, low feed salinity leads to significant gains by decreasing the specific energy consumption of the desalination process.
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Affiliation(s)
- Ismail Abd-Elaty
- Department of Water and Water Structures Engineering, Faculty of Engineering, Zagazig University, 44519 Zagazig, Egypt
| | - Abeer E L Shahawy
- Department of Civil Engineering, Faculty of Engineering, Suez Canal University, PO Box 41522, Ismailia, Egypt
| | - Sergio Santoro
- Department of Environmental Engineering, University of Calabria, Ponte P. Bucci, 87036 Rende, Italy
| | - Efrem Curcio
- Department of Environmental Engineering, University of Calabria, Ponte P. Bucci, 87036 Rende, Italy
| | - Salvatore Straface
- Department of Environmental Engineering, University of Calabria, Ponte P. Bucci, 87036 Rende, Italy.
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15
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Evaluation of Land Potential for Use of Biosolids in the Coastal Mediterranean Karst Region. LAND 2021. [DOI: 10.3390/land10101035] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of this study was to evaluate the potential of agricultural land in the coastal Adriatic Karst region (Šibenik region, Croatia) for biosolids application by integrating spatial data from different sources: digital maps and remote sensing, parcel identification system, GIS field observations and measurements focusing on specific land and soil properties. Due to the rapid development of the wastewater treatment industry, excessive accumulation of sewage sludge (SS) in wastewater treatment plants is a growing problem worldwide. Management options for land application of biosolids require a comprehensive characterization of both SS and SS-amended soils. The assessment of agricultural land in the study area for SS disposal was based on EU and national legislation. The evaluation revealed that agricultural land in the study area accounts for only 10% of the total area (25,736 ha), but only a quarter of the existing land (6065 ha) is suitable for biosolids application. Furthermore, the data indicate that the sewage sludge can be safely applied to the soil in terms of soil metals according to the Croatian legislation. The short-term potential of the soil to sustain this ecosystem service, namely soil improvement with biosolids, should be used to determine the inherent long-term potential based on resistance to soil degradation and resilience. However, caution is needed and the long-term effects should be investigated before biosolids are continuously used for soil application.
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16
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Using Isotopic and Hydrochemical Indicators to Identify Sources of Sulfate in Karst Groundwater of the Niangziguan Spring Field, China. WATER 2021. [DOI: 10.3390/w13030390] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Karst groundwater in the Niangziguan spring fields is the main source to supply domestic and industrial water demands in Yangquan City, China. However, the safety of water supply in this region has recently suffered from deteriorating quality levels. Therefore, identifying pollution sources and causes is crucial for maintaining a reliable water supply. In this study, a systematic sample collection for the karst groundwater in the Niangziguan spring fields was implemented to identify hydrochemical characteristics of the karst groundwater through comprehensive analyses of hydrochemistry (piper diagram, and ion ratios,) and stable isotopes (S and H-O). The results show that the karst groundwater in the Niangziguan spring fields was categorized as SO4·HCO3-Ca·Mg, HCO3·SO4-Ca·Mg, and SO4-Ca types. K+, Cl-, and Na+ are mainly sourced from urban sewage and coal mine drainage. In addition, SO42− was mainly supplied by the dissolution of gypsum and the oxidation of FeS2 in coal-bearing strata. It is noteworthy that, based on H-O and S isotopes, 75% of the karst groundwater was contaminated by acidic water in coal mines at different degrees. In the groundwater of the Niangziguan spring field, the proportions of SO42− derived from FeS2 oxidation were 60.6% (N50, Chengxi spring), 30.3% (N51, Wulong spring), and 26.0% (N52, Four springs mixed with water). Acid mine drainage directly recharges and pollutes karst groundwater through faults or abandoned boreholes, or discharges to rivers, and indirectly pollutes karst groundwater through river infiltration in carbonate exposed areas. The main source of rapid increase of sulfate in karst groundwater is acid water from abandoned coal mines.
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17
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The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review. WATER 2021. [DOI: 10.3390/w13010090] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Mediterranean area is undergoing intensive demographic, social, cultural, economic, and environmental changes. This generates multiple environmental pressures such as increased demand for water resources, generation of pollution related to wastewater discharge, and land consumption. In the Mediterranean area, recent climate change studies forecast large impacts on the hydrologic cycle. Thus, in the next years, surface and ground-water resources will be gradually more stressed, especially in coastal areas. In this review paper, the historical and geographical distribution of peer-review studies and the main mechanisms that promote aquifer salinization in the Mediterranean area are critically discussed, providing the state of the art on topics such as actual saltwater wedge characterization, paleo-salinities in coastal areas, water-rock interactions, geophysical techniques aimed at delineating the areal and vertical extent of saltwater intrusion, management of groundwater overexploitation using numerical models and GIS mapping techniques for aquifer vulnerability to salinization. Each of the above-mentioned approaches has potential advantages and drawbacks; thus, the best tactic to tackle coastal aquifer management is to employ a combination of approaches. Finally, the number of studies focusing on predictions of climate change effects on coastal aquifers are growing but are still very limited and surely need further research.
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