Contaminant transport modelling of heavy metal pollutants in soil and groundwater: An example at a non-ferrous smelter site

Abstract

The topsoil of smelter sites is subjected to severe contamination by heavy metals (HMs). Existing numerical simulations typically treat soil and groundwater separately owing to data limitations and computational constraints, which does not reflect the actual situation. Herein, a three-dimensional coupled soil-groundwater reactive solute transport numerical model was developed using the Galerkin finite element method with the smelter as the research object. This model treats soil and groundwater as a whole system, providing a quantitative characterization of HMs migration patterns in soil and groundwater. The model used the reaction coefficient (λ) and retention coefficient (R) to describe the release and adsorption capacities of HMs. Results from the model were consistent with actual pollution distributions in the field, indicating the efficacy of the soil-groundwater remediation technology for severe soil and localized groundwater pollution. The constructed three-dimensional coupled soil-groundwater reactive solute transport model can describe and predict the distribution and transport diffusion behavior of HMs at the study site with good efficacy. The model was also used to simulate and predict the effects of remediation technologies during the treatment of smelting site contamination, providing guidance for optimizing the treatment plan.

Keywords

non-ferrous smelting sites / heavy metal pollution / transportation and transformation mechanisms / diffusion flux prediction / remediation technology simulation

References

[[1]] Adnan M, Xiao B, Xiao P, et al.. Research progress on heavy metals pollution in the soil of smelting sites in China [J]. Toxics, 2022, 10(5): 231,

[[2]] El-Aassar A H, Hagagg K, Hussien R, et al.. Integration of groundwater vulnerability with contaminants transport modeling in unsaturated zone, case study El-Sharqia, Egypt [J]. Environmental Monitoring and Assessment, 2023, 195(6): 722,

[[3]] Ma J, Singhirunnusorn W. Distribution and health risk assessment of heavy metals in surface dusts of maha sarakham municipality [J]. Procedia − Social and Behavioral Sciences, 2012, 50: 280-293,

[[4]] Jiang Z, Guo Z, Peng C, et al.. Heavy metals in soils around non-ferrous smelteries in China: Status, health risks and control measures [J]. Environmental Pollution, 2021, 282: 117038,

[[5]] Li C, Zhou K, Qin W, et al.. A review on heavy metals contamination in soil: Effects, sources, and remediation techniques [J]. Soil and Sediment Contamination, 2019, 28(4): 380-394,

[[6]] He Z, Shentu J, Yang X, et al.. Heavy metal contamination of soils: Sources, indicators and assessment [J]. Journal of Environmental Indicators, 2015, 9: 17-18

[[7]] Yue L, Ge C, Feng D, et al.. Adsorption-desorption behavior of atrazine on agricultural soils in China [J]. Journal of Environmental Sciences, 2017, 57: 180-189,

[[8]] Serrano S, Garrido F, Campbell C G, et al.. Competitive sorption of cadmium and lead in acid soils of Central Spain [J]. Geoderma, 2005, 124(1–2): 91-104,

[[9]] Arco-Lázaro E, Agudo I, Clemente R, et al.. Arsenic(V) adsorption-desorption in agricultural and mine soils: Effects of organic matter addition and phosphate competition [J]. Environmental Pollution, 2016, 216: 71-79,

[[10]] Zhao X, Jiang T, Du B. Effect of organic matter and calcium carbonate on behaviors of cadmium adsorption-desorption on/from purple paddy soils [J]. Chemosphere, 2014, 99: 41-48,

[[11]] Jing F, Chen X, Yang Z, et al.. Heavy metals status, transport mechanisms, sources, and factors affecting their mobility in Chinese agricultural soils [J]. Environmental Earth Sciences, 2018, 77(3): 104,

[[12]] Zimmermann J, Dierkes C, Göbel P, et al.. Metal concentrations in soil and seepage water due to infiltration of roof runoff by long term numerical modelling [J]. Water Science and Technology: A Journal of the International Association on Water Pollution Research, 2005, 51(2): 11-19,

[[13]] Azizullah A, Khattak M N K, Richter P, et al.. Water pollution in Pakistan and its impact on public health: A review [J]. Environment International, 2011, 37(2): 479-497,

[[14]] Hashim M A, Mukhopadhyay S, Sahu J N, et al.. Remediation technologies for heavy metal contaminated groundwater [J]. Journal of Environmental Management, 2011, 92(10): 2355-2388,

[[15]] Mahajan M, Gupta P K, Singh A, et al.. A comprehensive study on aquatic chemistry, health risk and remediation techniques of cadmium in groundwater [J]. Science of the Total Environment, 2022, 818: 151784,

[[16]] Bai X, Song K, Liu J, et al.. Health risk assessment of groundwater contaminated by oil pollutants based on numerical modeling [J]. International Journal of Environmental Research and Public Health, 2019, 16(18): 3245,

[[17]] Masood Z B, Abd Ali Z T. Numerical modeling of two-dimensional simulation of groundwater protection from lead using different sorbents in permeable barriers [J]. Environmental Engineering Research, 2020, 25(4): 605-613,

[[18]] Shamsudduha M, Zahid A, Burgess W G. Security of deep groundwater against arsenic contamination in the Bengal Aquifer System: A numerical modeling study in southeast Bangladesh [J]. Sustainable Water Resources Management, 2019, 5(3): 1073-1087,

[[19]] Chidambaram S, Anandhan P, Prasanna M V, et al.. Hydrogeochemical modelling for groundwater in neyveli aquifer, Tamil Nadu, India, using PHREEQC: A case study [J]. Natural Resources Research, 2012, 21(3): 311-324,

[[20]] Xue S, Ke W, Zeng J, et al.. Pollution prediction for heavy metals in soil-groundwater systems at smelting sites [J]. Chemical Engineering Journal, 2023, 473: 145499,

[[21]] Facchi A, Ortuani B, Maggi D, et al.. Coupled SVAT-groundwater model for water resources simulation in irrigated alluvial Plains [J]. Environmental Modelling & Software, 2004, 19(11): 1053-1063,

[[22]] Niswonger R G, Prudic D E. Modeling variably saturated flow using kinematic waves in MODFLOW [M]. Groundwater Recharge in a Desert Environment: The Southwestern United States, 2004 Washington, D. C. American Geophysical Union 101-112,

[[23]] Yakirevich A, Borisov V, Sorek S. A quasi three-dimensional model for flow and transport in unsaturated andsaturated zones: 1. Implementation of the quasi two-dimensional case [J]. Advances in Water Resources, 1998, 21(8): 679-689,

[[24]] Giraud Q, Gonçalvès J, Paris B, et al.. 3D numerical modelling of a pulsed pumping process of a large DNAPL pool: In situ pilot-scale case study of hexachlorobutadiene in a keyed enclosure [J]. Journal of Contaminant Hydrology, 2018, 214: 24-38,

[[25]] Ramasamy M, Power C, Mkandawire M. Numerical prediction of the long-term evolution of acid mine drainage at a waste rock pile site remediated with an HDPE-lined cover system [J]. Journal of Contaminant Hydrology, 2018, 216: 10-26,

[[26]] Ashraf A, Chen X, Ramamurthy R. Modelling heavy metals contamination in groundwater of Southern Punjab, Pakistan [J]. International Journal of Environmental Science and Technology, 2021, 18(8): 2221-2236,

[[27]] Council N R, Earth D O, Studies L, et al.. . Ground water vulnerability assessment: Predicting relative contamination potential under conditions of uncertainty [M], 1993 Washington DC National Academies Press

[[28]] Ortiz-Zamora D, Ortega-Guerrero A. Evolution of long-term land subsidence near Mexico City: Review, field investigations, and predictive simulations [J]. Water Resources Research, 2010, 46(1): W01513,

[[29]] Tsakiroglou C D. A multi-scale approach to model two-phase flow in heterogeneous porous media [J]. Transport in Porous Media, 2012, 94(2): 525-536,

[[30]] Sege J, Ghanem M, Ahmad W, et al.. Distributed data collection and web-based integration for more efficient and informative groundwater pollution risk assessment [J]. Environmental Modelling & Software, 2018, 100: 278-290,

[[31]] Cushman J H, Tartakovsky D M. . The handbook of groundwater engineering [M], 2016 Boca Raton CRC Press,

[[32]] Ju Y, Gong W, Chang W, et al.. Effects of pore characteristics on water-oil two-phase displacement in nonhomogeneous pore structures: A pore-scale lattice Boltzmann model considering various fluid density ratios [J]. International Journal of Engineering Science, 2020, 154: 103343,

[[33]] Lu W, Yang Q, Martín J D, et al.. Numerical modelling of seawater intrusion in Shenzhen (China) using a 3D density-dependent model including tidal effects [J]. Journal of Earth System Science, 2013, 122(2): 451-465,

[[34]] Sherene T. Mobility and transport of heavy metals in polluted soil environment [J]. Biological forum—An International Journal, 2010, 2(2): 112-121

[[35]] Dube A, Zbytniewski R, Kowalkowski T, et al.. Adsorption and migration of heavy metals in soil [J]. Polish Journal of Environmental Studies, 2001, 10(1): 1-10