Application of geochemical and geophysical approach to environmental impact assessment: a case study of Emirin active open dumpsite, Ado-Ekiti Southwestern Nigeria

Olagunju, Emmanuel; Ariyibi, Emmanuel A.; Awoyemi, Musa Olufemi; Adebayo, Akanmu; Dasho, Oluwaseyi A.; Adenika, Charles I.

doi:10.1007/s40808-017-0381-1

Cited by 13 publications

(5 citation statements)

References 3 publications

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“…Notably, groundwater development in a typical basement complex environment is found in two main aquifer units, which are the weathered zone and the fractured basement aquifers (Falowo et al, 2019;Olagunju et al, 2017;Olorunfemi & Oni, 2019). Chemical alteration of the minerals produced the weathered aquifer layer while the fractured rock system originates from tectonic activities.…”

Section: Location and Geological Setting Of The Study Areamentioning

confidence: 99%

Investigation of the Source of Groundwater Contamination Near a Farmland Using the VLF-EM and Magnetic Methods

2022

JEES

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Groundwater pollution continues to be a major problem in society where there is high level of urbanization, industrialization and conventional/inorganic farming. A detailed ground magnetic survey and VLF-EM was carried out on a site just beside a farmland to investigate the possible causes of the groundwater contamination in the area which lies within the Precambrian Basement Complex of Southwestern Nigeria. The survey was carried out using a proton precision magnetometer kept at a constant height during the survey, accompanied by Very Low Frequency -Electromagnetic Method (VLF-EM). Data for the two methods were acquired on five (5) traverses with the length of 100 m each. The distance between each traverse (inter traverse spacing) is 5 m. The VLF-EM data were interpreted qualitatively, using the Fraser and the Karous-Hjelt filters. The Fraser filtered data and relative current density pseudosections from the VLF-EM data indicate the presence of shallow and deep conductive zones that cross the farmland which are indicative of fractures. The quantitative interpretation of the data was done with a 2-D code that performs the inversion of the data. Magnetic maps were generated using Oasis Montaj, and profiles were plotted using Microsoft Excel software. From the results obtained, some major geological features were identified while linear features suspected to be fault/fractured zones, weathered zones, and bedrock depressions were delineated. Low magnetic intensity indicating presence of weak and incompetent zones were discovered. Earlier chemical analysis of both surface and groundwater collected at some depth on the farmland confirms the presence of water contamination. This knowledge supported the interpretation of the anomalies detected by VLF-EM and magnetic data as a possible cause of the contaminated groundwater flowing in connected fractures. The study concluded that the groundwater contamination originates from the farmland where some samples of the soil were found to contain nitrate chemicals resulting from fertilizer and pesticide used to enhance plant growth.

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Section: Location and Geological Setting Of The Study Areamentioning

confidence: 99%

Investigation of the Source of Groundwater Contamination Near a Farmland Using the VLF-EM and Magnetic Methods

2022

JEES

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“…The leachate which comprises both biological and chemical components percolates through the subsurface materials and pollutes the groundwater (Figure 1). Figure 1: Showing the illustration of leachate contaminant from a dumpsite facility percolating into the groundwater as reported by [12] Consequently, dumpsites characterization, determination of possible contaminant zones and extent of pollution have been applied using some of the geophysical methods or integrated methods for perfect delineation [13]; [14]; [15]; [16]; and [17]. Furthermore, integrated geophysical techniques are used because of their capacity to provide information on thesubsurface in a timely and cost-effective manner, ranging from the level of contamination to the porosity of the materials.…”

Section: Introductionmentioning

confidence: 99%

Application of VLF-EM response and geoelectrical sounding in groundwater investigation around an active dumpsite

Adeniji,

Ajani,

Adagunodo

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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An integrated geophysical method combining very low frequency electromagnetic (VLF-EM) and vertical electrical sounding (VES) methods were carried out around Adaland, Southwestern Nigeria, located within latitude 7° 54’ 0” and longitude 4° 43’ 0”, with a view to investigate the possible impact of dumpsite on groundwater. This is the major study in the environment to offer extensive evidence regarding the suitability of obtaining quality groundwater. In this research, eight VLF-EM and twelve VES data sets were generated, which were then used to estimate the linear structure, bedrock formation, subsurface geological characteristics, and identification of leachate pathways. The VLF-EM data were analyzed by employing Karous_Hjelt and Microsoft Excel, while the VES data were investigated using the WinRESIST software. TheVLF-EM results confirmed the presence of conductive zones, which might be due to fracture, fault and contact zones or weathered basements. The lithological units acquired from the electrical resistivity results revealed four geoelectrical layers such as topsoil, weathered-based, fractured basement and fresh basement. However, the identified weathered layers and fractured basements from the geoelectrical sections and the corresponding Karous and Hjelt (K-H) pseudo sectionresults around the dumpsite, constitute the main passages for the possible impact of the open dumpsite on groundwater quality, since leachates from the dumpsite could slowly percolate downwards from the topsoil to the water table. Therefore, the impact of the dumpsite on the groundwater is caused by the inadequate clay materials, near-surface features such as fractures/faults, and lateral in-homogeneity. Thus, integrating both methods has been recommended in site characterization for accessing quality groundwater around a dumpsite environment.

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“…PTEs in groundwater are caused mainly by widespread industry, inadequate wastewater treatment, and a lack of public awareness. According to various studies, a number of variables, such as excessive agrochemicals usage, inadequately treated wastewater, waste disposal locations, chemical spills, etc., result in heavy metal contamination in water supplies (Kale et al 2010 ; Bhuiyan et al 2010 ; Olagunju et al 2017 ; Zhu et al 2020 ; Panaskar et al 2014 ; Matta et al 2022a ; Kumar et al 2023c ).…”

Section: Introductionmentioning

confidence: 99%

Assessment of potentially toxic elements in groundwater through interpolation, pollution indices, and chemometric techniques in Dehradun in Uttarakhand State

Nayak

Matta

Uniyal

et al. 2023

Environ Sci Pollut Res

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Providing safe drinking water for the entire world’s population is essential for ensuring sustainable development. The presence of harmful compounds in aquifers, majorly toxic elements, is a serious environmental concern around the globe. This research aimed to quantify for the initial period the amounts of toxic elements in freshwater in the Dehradun Industrial Region of Uttrakhand, India, as well as the associated health risks. The PTEs (potentially toxic elements) Fe, Cd, Mn, Cu, Cr and Pb, Zn, Ni is measured by AAS and compared to BIS and WHO requirements for drinking safety. The order of mean trace element values in all groundwater samples were determined as Fe > Zn > Cu > Ni > Co > Cd > Pb. HPI was discovered to be higher than high class during the research period (HPI > 30), but under the severe contamination criterion of 100. Iron’s MI and PI values were consistently over the threshold limit during the research period, and certain toxic elements were discovered exceptionally near the threshold limit, indicating a severe future influence on groundwater quality. According to PCA (principal component analysis), CM (correlation matrix), and potential health hazard, maximum levels of toxic elements in groundwater in the Dehradun region are attributed to land use patterns, anthropogenic activity, industrial activity, fertilizer and pesticide leaching, and residential waste into the aquifer system. The findings of this study could aid local planners and policymakers in preventing health risks from contaminated aquifers through the deployment of suitable monitoring and mitigation measures.

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Application of geochemical and geophysical approach to environmental impact assessment: a case study of Emirin active open dumpsite, Ado-Ekiti Southwestern Nigeria

Cited by 13 publications

References 3 publications

Investigation of the Source of Groundwater Contamination Near a Farmland Using the VLF-EM and Magnetic Methods

Investigation of the Source of Groundwater Contamination Near a Farmland Using the VLF-EM and Magnetic Methods

Application of VLF-EM response and geoelectrical sounding in groundwater investigation around an active dumpsite

Assessment of potentially toxic elements in groundwater through interpolation, pollution indices, and chemometric techniques in Dehradun in Uttarakhand State

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