Hydrochemistry and assessment of heavy metals groundwater contamination in an industrialized city of sub-Saharan Africa (Douala, Cameroon). Implication on human health

Boum-Nkot, S. Ngo; Nlend, Bertil; Komba, D.; Ndondo, Gustave Raoul Nkoue; Bello, Mohammad; Fongoh, Enoh Jeanot; Ntamak-Nida, Marie Joseph; Étamé, Jacques

doi:10.1016/j.hydres.2023.01.003

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…It is important to consider that, while heavy metal concentrations are released, they can become diluted in the natural environment during rainfall events, reducing the risk of groundwater contamination [76][77][78]. Analyzing the rainfall intensity and the equivalent water injection rate into the column, it was determined that, at L/S 1000, approximately 170 years' worth of water had passed through the column.…”

Section: Column Leaching Testmentioning

confidence: 99%

Long-Term Leaching Behavior and Geochemical Modeling of Cement Solidified Incineration Fly Ash Containing Waste Tires and Wood Biomass

2023

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Waste incineration is a widely used treatment method, and sustainable approaches are required to properly recycle large volumes of incineration ash to reduce environmental impacts and landfill space consumption. Studies have focused on the potential of recycling incineration ash as a replacement for natural aggregates in civil engineering applications, such as road construction. However, industrial waste incineration ash, such as waste tire incineration ash, contains hazardous heavy metals, such as lead and zinc that pose potential environmental threats. Moreover, few studies have investigated the leachability of these hazardous metals after long-term natural aging. This study investigates the long-term evolution of leachate chemistry, mineralogical transformation, and heavy metal fixation performance of a recycled roadbed material using ash from industrial waste incineration of waste tires and biomass (SFA). Additionally, field samples from a five-year pilot test site utilizing SFA were also examined. Regulatory leaching tests showed that the concentrations of Cd, Pb, As, T-Cr, and Ni were all below permissible limits even after five years of utilization. Long-term column leaching experiment results indicated that, compared to the total content of the SFA material, the leaching ratios of Pb, T-Cr, Cu, and Zn were 27%, 12%, 5%, and 0.1%, respectively. The SFA pH-stat leaching test results demonstrated that the mass release of the total content of heavy metals was relatively minimal, even under acidic pH conditions (pH < 4). Finally, profiles of pH and major ions in leachate from the column leaching experiment were simulated using HYDRUS HP1, implementing a dual-porosity modeling approach. In conclusion, despite containing hazardous heavy metals, SFA exhibits significantly low leaching rates over a long-term period.

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Section: Column Leaching Testmentioning

confidence: 99%

Long-Term Leaching Behavior and Geochemical Modeling of Cement Solidified Incineration Fly Ash Containing Waste Tires and Wood Biomass

2023

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“…PHEs have been extensively studied as inorganic contaminants due to their toxicity, persistent nature, and bioaccumulation in the food chain, thereby imposing high human health risk worldwide (Machado et al, 2017;Baken et al, 2018;Saleem et al, 2019;Ayejoto and Egbueri, 2023;Boum-Nkot et al, 2023). PHEs such as Cd, and Pb are among the hazardous chemicals having strongly toxic characteristics (Souza et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Potentially harmful elements and health risk assessment in groundwater of urban industrial areas

Ishtiaq,

Khan,

Khan

et al. 2024

Front. Environ. Sci.

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Groundwater quality was investigated in three urban semi-arid multi-industrial metropolitan areas i.e. (Hayatabad Industrial Estate, Peshawar (HIEP), Gadoon Industrial Estate, Swabi (GIES) and Hattar Industrial Estate, Haripur (HIEH). The main aim of the study was to determine their physicochemical parameters, potentially harmful elements (PHEs) concentration, pollution sources and public health risks in semi-arid multi-industrial metropolitan areas of Khyber Pakhtunkhwa (KPK), Pakistan. The physicochemical parameters (pH, TDS and EC), PHEs (Cd, Zn, Pb, Cr and Ni) concentrations and Mg in drinking water sources were found within the permissible limits, except Fe, which exceeded the World Health Organization (WHO) acceptable limit. Among PHEs, Zn had the highest contribution rates of 69.6%, 58.2% and 67.64% in HIEP, GIES and HIEH, respectively, while Cd showed the lowest contribution rates (3.15%, 1.98% and 2.06%) for HIEP, GIES and HIEH respectively. Principal component analysis (PCA) showed significant correlations between parameters, with contributions of industrial effluents and wastewater discharge (46.81%), mixed sources (34.05%) and geo-genic sources (19.14%) for drinking water in the study area. The carcinogenic risk (CR) for Cd, Cr, Ni and Pb, were found within the acceptable threshold value of 1 × 10−4. This study suggests that urban groundwater should also be regularly monitored for PHEs contamination as over-extraction, industrialization and informal E-waste recycling events surges the public health risks globally, facing related environmental contamination difficulties of the urban groundwater.

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“…Despite its economic importance, mining is among the anthropogenic activities that hurt water resources (Bondu et al, 2023, Santana et al, 2020Zhao et al, 2017). It can expose residues rich in sulfide minerals to oxidation (Sarker et al, 2023;Wang et al, 2023;Li et al, 2022), which are not economically exploitable and are the overall result of extraction and processing stages (Abdellaoui et al, 2023; Karacan et al, 2023;Araya et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…So, worldwide, the water quality index is widely used to assess and monitor water quality by government agencies, researchers, and environmental organizations (Dutta et al, 2022;Varma et al, 2022). It is also used to assess water quality in the vicinity of pollution sources, such as mining activities, which generate a considerable volume of mining waste in nature (Zaghloul et al, 2023;Boum-Nkot et al, 2023;Effendi et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Application of the Water Quality Index to Assess Groundwater Quality in the Bou Dhar Mining District in Beni Tajjit (High Atlas, Morocco)

Mohamed,

Omar,

Abdellali

et al. 2023

Ecol. Eng. Environ. Technol.

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Water scarcity remains the main problem in Morocco, making water resource conservation paramount. The objective of this study is to shed light on how mining impacts the region of Beni Tajjit's groundwater resources, which are used for irrigation and watering, which includes the Bou Dhar mining district, known for its vast lead and zinc sulfide deposits. The oxidation of sulfide-rich mine tailings generates acid water loaded with sulfates, creating acid mine drainage (AMD), which hurts aquatic ecosystems and the environment through trace metals elements (TME). Hence the need to assess the possible contamination of aquifers by metallic pollutants. This work can help water managers make appropriate decisions for controlling the quality of the groundwater in the Beni Tajjit area. During this study, we adopted a method: the Water Quality Index (WQI), designed to indicate the overall level of water quality by aggregating various weighted measurements. Five samples representing water sources around the mine tailings were taken and analyzed. Their values of dissolved oxygen, electrical conductivity and pH were measured on-site. The results allow us to classify the water into good and bad categories. They showed that the TME values were practically lower than the maximum permitted level according to WHO norms and Moroccan irrigation standards. The main reason for this may be due to the carbonate geological context of the site, which buffers acidity and thus forms a chemical barrier against the transfer of TME to the aquifer. The high chlorine levels appear due to geochemical background or anthropogenies contaminations. The sulfate values recorded are related to the leaching of sulfide minerals from mine tailings.

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Hydrochemistry and assessment of heavy metals groundwater contamination in an industrialized city of sub-Saharan Africa (Douala, Cameroon). Implication on human health

Cited by 16 publications

References 32 publications

Long-Term Leaching Behavior and Geochemical Modeling of Cement Solidified Incineration Fly Ash Containing Waste Tires and Wood Biomass

Long-Term Leaching Behavior and Geochemical Modeling of Cement Solidified Incineration Fly Ash Containing Waste Tires and Wood Biomass

Potentially harmful elements and health risk assessment in groundwater of urban industrial areas

Application of the Water Quality Index to Assess Groundwater Quality in the Bou Dhar Mining District in Beni Tajjit (High Atlas, Morocco)

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