Metal Loadings and Alkaline Mine Drainage from Active and Abandoned Mines in the Ivo River Basin Area of Southeastern Nigeria

Ezekwe, Ifeanyichukwu Clinton; Ezekwe, Ahamefula Sunday; Chima, G. N.

doi:10.1007/s10230-013-0220-1

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…However, only a few of the rainwater samples within some of the sampling axes were within the acceptable limit of the WHO standard [32]. The variation observed for the river water samples could be attributed to the release of suspended particles because of some human activities like fishing and sand mining in the area and this is in line with the report of Nkwoji et al, [37] and the work of Ezekwe et al, [38] who recorded turbidity of 10 in pond water at Imo River Basin area sampled. The turbidity values of the precipitation water in the area show that approximately one-third meet the WHO standards [32], while a significant majority of over two-thirds exceed the prescribed limits.…”

Section: Electrical Conductivity (Ec)supporting

confidence: 75%

Chemophysical and Metallic Characterization of Surface Water and Precipitation for Environmental Quality Assessment in Oyigbo L.G.A., Rivers State, Nigeria

Ahmed,

Udom,

Obafemi

2024

JOGEE

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This study investigates the repercussions of oil industry operations on environmental quality in the Niger Delta, with a specific focus on atmospheric soot contamination. By conducting chemophysical and metallic characterization of surface water (river) and precipitation (rain) in Oyigbo, Rivers State, Nigeria, the research evaluates various chemical and physical parameters, like pH, electrical conductivity (EC), total suspended solids (TSS), turbidity, as well as concentrations of heavy metals like lead (Pb), copper (Cu), cadmium (Cd), and zinc (Zn). The findings uncover a slightly acidic to neutral pH in water samples. The elevated EC in the Imo River, while meeting WHO standards, highlights the delicate balance between industrial development and environmental health. Turbidity values, meeting WHO standards but exceeding limits in some rainwater samples, prompt scrutiny of anthropogenic influences, with fishing and sand mining emerging as potential contributors to river turbidity, while TSS values, though higher along the Imo River, remain within WHO standards. Results reveal Cd, Cu, and Zn adhere to standards, while the elevated Pb levels necessitate further exploration into contamination sources. The heavy metals pollution index (HPI) categorizes the area as polluted and identifies lead as the primary contributor, underlining the urgency of interventions. The potential ecological risks index (PERI) classifies the pollution risk as slight, indicating a low ecological risk level, and reveals risk hierarchies, in the order of metals contributing to pollution as Pb > Cu > Cd > Zn for both river and rainwater. This study unravels the relationship between industrial activities and water quality in Oyigbo, contributing substantively to sustainable water resources and environmental management. The detailed findings stand as a cornerstone for informed decision-making, aiming to mitigate environmental impacts and safeguard ecosystems and communities reliant on vital water sources.

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Section: Electrical Conductivity (Ec)supporting

confidence: 75%

Chemophysical and Metallic Characterization of Surface Water and Precipitation for Environmental Quality Assessment in Oyigbo L.G.A., Rivers State, Nigeria

Ahmed,

Udom,

Obafemi

2024

JOGEE

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“…29 At mining locations, it is common to find water with high hardness (50 to 500 mmol L -1 ) that degasses slowly due to the acidification or solubilized suspended carbonates when pH decreases. 30 Regulations do not allow water hardness in concentrations >5 mmol L -1 in surface or tap water. Therefore, mining water treatment should include processes to reduce carbonate and bicarbonate content.…”

Section: Mechanisms For Current Production From Hydrogen Gas and Bicamentioning

confidence: 99%

Gas diffusion electrodes improve hydrogen gas mass transfer for a hydrogen oxidizing bioanode

Rodenas

Zhu

Heijne

et al. 2017

J. Chem. Technol. Biotechnol

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BackgroundBioelectrochemical systems (BESs) are capable of recovery of metals at a cathode through oxidation of organic substrate at an anode. Recently, also hydrogen gas was used as an electron donor for recovery of copper in BESs. Oxidation of hydrogen gas produced a current density of 0.8 A m‐2 and combined with Cu2+ reduction at the cathode, produced 0.25 W m‐2. The main factor limiting current production was the mass transfer of hydrogen to the biofilm due to the low solubility of hydrogen in the anolyte. Here, the mass transfer of hydrogen gas to the bioanode was improved by use of a gas diffusion electrode (GDE).ResultsWith the GDE, hydrogen was oxidized to produce a current density of 2.9 A m‐2 at an anode potential of –0.2 V. Addition of bicarbonate to the influent led to production of acetate, in addition to current. At a bicarbonate concentration of 50 mmol L‐1, current density increased to 10.7 A m‐2 at an anode potential of –0.2 V. This increase in current density could be due to oxidation of formed acetate in addition to oxidation of hydrogen, or enhanced growth of hydrogen oxidizing bacteria due to the availability of acetate as carbon source. The effect of mass transfer was further assessed through enhanced mixing and in combination with the addition of bicarbonate (50 mmol L‐1) current density increased further to 17.1 A m‐2.ConclusionHydrogen gas may offer opportunities as electron donor for bioanodes, with acetate as potential intermediate, at locations where excess hydrogen and no organics are available. © 2017 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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“…Water Environment Research, Volume 86, Number 10-Copyright © 2014 Water Environment Federation conductivity, and turbidity were found with unacceptable levels of some metals (Ezekwe et al, 2013). In the meanwhile, the wetlands that serve as sinks for pollutants in mine drainage became continuous sources of pollution to both surface and ground water.…”

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confidence: 99%

Mine Drainage: Characterization, Treatment, Modeling, and Environmental Aspect

Wei

Wolfe

Han

2014

Water Environment Research

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Globally, mine drainage is a persistent environmental problem facing the mining industry. This review covers the literature published in 2013 on topics relating to acid mine drainage (AMD) or acid rock drainage (ARD) due to the presence of sulfide bearing minerals in active and abandoned coal/hard rock mining sites or waste spoil piles. This review is divided into the four sections: 1) mine drainage characterization, 2) mine drainage treatment 3) modeling and simulation, and 4) environmental aspect. Mine Drainage Characterization Physicochemical Characterization. The characteristics of mine sites have profound impacts on the quality and quantity of acid mine drainage (AMD) or acid rock drainage (ARD), the toxicity of the contaminants, the fate and transport of the metals, and the required treatment or remediation methods. The mine drainage from the Globe-Progress gold mine, New Zealand, were circumneutral (pH 6-8) with high HCO 3 -and SO 4 2-(both up to 300 mg/L) and elevated As (0.5 mg/L) and Sb(~3 mg/L) (Druzbicka and Craw, 2013). The Sb/As ratio in the mine drainage ranged from 1 in historic mines, to ~30 below the modern mine. It was found mining methods and contrasting ore types had a dramatic effect on the metalloid contents. The characteristics of alkaline mine drainage from 11 active and abandoned mines were examined in the Lokpaukwu-Ishiagu mining areas of Nigeria, where very high concentrations of TDS, hardness, chloride, calcium,

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Metal Loadings and Alkaline Mine Drainage from Active and Abandoned Mines in the Ivo River Basin Area of Southeastern Nigeria

Cited by 12 publications

References 13 publications

Chemophysical and Metallic Characterization of Surface Water and Precipitation for Environmental Quality Assessment in Oyigbo L.G.A., Rivers State, Nigeria

Chemophysical and Metallic Characterization of Surface Water and Precipitation for Environmental Quality Assessment in Oyigbo L.G.A., Rivers State, Nigeria

Gas diffusion electrodes improve hydrogen gas mass transfer for a hydrogen oxidizing bioanode

Mine Drainage: Characterization, Treatment, Modeling, and Environmental Aspect

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