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Pollution potential and causative hydrogeochemical processes in unconfined aquifer systems in a typical urban setting: emphasis on recharge and discharge areas

Asiwaju-Bello, Y. A. ; Olabode, O. F. ; Ogunsuyi, M. T.

Applied water science, 2020, Vol.10 (1), p.1-23, Article 52 [Periódico revisado por pares]

Cham: Springer International Publishing

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Título:
Pollution potential and causative hydrogeochemical processes in unconfined aquifer systems in a typical urban setting: emphasis on recharge and discharge areas
Autor: Asiwaju-Bello, Y. A. ; Olabode, O. F. ; Ogunsuyi, M. T.
Assuntos: Anions ; Aquatic Pollution ; Aquifer systems ; Aquifers ; Calcium ; Calcium ions ; Cations ; Comparative Law ; Discharge ; Dug wells ; Earth and Environmental Science ; Earth Sciences ; Elevation ; Environmental assessment ; Groundwater ; Groundwater discharge ; Groundwater divide ; Groundwater management ; Groundwater quality ; Groundwater recharge ; Groundwater table ; Hydrogeochemical facies ; Hydrogeochemistry ; Hydrogeology ; Hydrologic data ; Industrial and Production Engineering ; International & Foreign Law ; Ion exchange ; Magnesium ; Nanotechnology ; Original Article ; Pollution ; Pollution assessment ; Private International Law ; Quality assessment ; Recharge ; Recharge areas ; Runoff ; Unconfined aquifers ; Urban areas ; Urban environments ; Voids ; Waste Water Technology ; Water Industry/Water Technologies ; Water Management ; Water pollution ; Water Pollution Control ; Water quality ; Water quality assessments ; Water table ; Water wells ; Weathering
É parte de: Applied water science, 2020, Vol.10 (1), p.1-23, Article 52
Descrição: The inhabitants of Akure Metropolis, south-western Nigeria, depend solely on groundwater for their domestic, industrial and irrigation purposes. There is a need to delineate recharge and discharge areas for assessment and management of groundwater in these areas. One hundred and ninety (190) dug wells were selected for this assessment. Elevation and water table data aided accurate delineation of recharge, discharge and groundwater divide areas. Thirty-six wells representative of recharge and discharge areas were subjected to pollution assessment [DRASTIC, water quality index (WQI) and runoff potential]. The results revealed that the recharge areas have higher pollution potential and runoff amount than the discharge areas. This implied that groundwater sourced from recharge areas was more pollution prone than that sourced from discharge areas. WQI results revealed that the waters from recharge and discharge areas fall within excellent, good, poor, and unsuitable quality categories. Hydrogeochemical results revealed that concentrations of cations and anions are in order of Ca 2+ > Mg 2+ > K + > Na + and HCO 3 − > Cl − > SO 4 2− with a predominant Ca–HCO 3 facies typifying water from a basement complex environment. Gibbs plot and chloro-alkaline index affirmed the rock dominance and existence of imprints of ion-exchange processes influencing the groundwater quality. Intense weathering activities aided with long resident time spent by the water in the voids of the aquifer media are characteristic in this terrain. Recharge of precipitating water through infiltration into the weathered basement aquifers is a pointer to the greater yield of water in the wells. The possibility that precipitation-weathering process has led to the increase in concentrations of all ionic species and possible pollution of the groundwaters from the recharge and discharge areas cannot be ruled out at all.
Editor: Cham: Springer International Publishing
Idioma: Inglês

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Pollution potential and causative hydrogeochemical processes in unconfined aquifer systems in a typical urban setting: emphasis on recharge and discharge areas

Asiwaju-Bello, Y. A. ; Olabode, O. F. ; Ogunsuyi, M. T.

Cham: Springer International Publishing

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