Water-rock interaction, formation and circulation mechanism of highly bicarbonate groundwater in the northwestern geothermal prospects of Rwanda

Ndikubwimana, Innocent; Mao, Xumei; Niyonsenga, Jean Damascene; Zhu, Dongbo; Mwizerwa, Schadrack

doi:10.18814/epiiugs/2021/021006

Cited by 3 publications

(1 citation statement)

References 55 publications

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“…The results of various geophysical surveys have been quite promising and positive. This region is characterized by a host of active volcanoes and hot springs, making it a possible target for geothermal development [1,2]. Geothermal energy is a renewable energy resource that can be used as an alternative to rain-dependent hydropower, as well as to reduce overreliance on carbon-based fuels that are of concern to the environment.…”

Section: Introductionmentioning

confidence: 99%

Geochemical survey of the Nyamyumba and Bugarama hot springs in the western province of Rwanda

Sunguti,

Muhizi,

Kibet

et al. 2024

Eur J Chem

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The focus of the current study was to investigate the presence of selected trace metals (Pb, Cd, Mn, Ni, and Cu) and to determine the major cation and anion levels in Nyamyumba and Bugarama hot springs in the Western Province of Rwanda. The trace metals were determined using micro plasma atomic emission spectroscopy. The mean Cu concentrations in Nyamyumba and Bugarama were found to be 0.1 mg/L and were within the permissible limits of the World Health Organization (WHO) for potable water. Similarly, Mn concentrations were within acceptable WHO limits with mean concentrations being 0.04±0.02 and 0.11±0.03 mg/L in Nyamyumba and Bugarama, respectively. The lead concentration was found to be above the WHO limits with mean results of 0.01±0.001 and 0.013±0.01 mg/L in Nyamyumba and Bugarama, respectively. The mean concentration of cadmium was 0.01 mg/L in both sampling sites, which is observed to be above the allowed WHO limit. Nickel, on the other hand, was found to be below the detection limit. The fluoride concentration was determined using the SPADNS Ultra Violet Spectroscopic (UV-VIS) method and its mean levels were found to be 1.07±0.05 and 0.85±0.07 mg/L in Nyamyumba and Bugarama, correspondingly, which is within the acceptable limit of the WHO. Due to the potential pollution trends identified in this study, it is recommended that biosorption remediation techniques be applied for potable and therapeutic water usage to reduce the levels of Pb and Cd, which can have serious etiological risks to both flora and fauna due to possible trace metal bioaccumulation.

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Section: Introductionmentioning

confidence: 99%

Geochemical survey of the Nyamyumba and Bugarama hot springs in the western province of Rwanda

Sunguti,

Muhizi,

Kibet

et al. 2024

Eur J Chem

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Hydrogeochemical similarities and groundwater-surface water interactions for the karst hydrological system of northwest Rwanda

Umutoni,

Selemani,

Rwiza

et al. 2023

Arab J Geosci

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Genesis of Geothermal Waters in Suichuan County, China: An Integrated Method Constrained by the Hydrochemical and Isotopic Characteristics

Akram

Chen

Huang

et al. 2022

Water

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Numerous geothermal resources of medium to low temperature have been reported in southern China. Suichuan County is one of the regions where thermal manifestations are abundant. However, the study regarding the understanding of geothermal water sources, hydrochemical composition and fluid-rock interaction lacks behind. Therefore, this study has characterized the slightly acidic to slightly alkaline bicarbonate geothermal waters of medium-low temperature of the Suichuan area. Geothermal waters of the study area have been evaluated mainly as of HCO3-Ca-Na hydrochemical type with a maximum temperature of 80 °C. The results indicate the low hydrochemical concentration where HCO3− acts as a principal anion. Furthermore, the F− content in geothermal and two cold water samples have been found high with a maximum value of 13.4 (mg/L), showing high pH of 9.6 as well. Here, the compilation of deuterium and oxygen-18 isotopic data of geothermal waters showed a local precipitation origin with a recharge elevation ranging from 630–1000 m. The circulation depth and reservoir temperatures are estimated, explaining the deep thermal water behavior. Additionally, the estimation of saturation indices of various minerals shows the geothermal waters’ corrosive or scaling behavior. Subsequently, the geothermal water points in the study area represent a fracture convection formation pattern. Finally, by integrating conventional hydrochemistry along with isotopic data, and considering the geological framework, a conceptual genetic model of the Suichuan thermal ground waters has been discussed. Hydrochemistry and isotopic features along with a conceptual circulation model have been provided by the foundation towards the sustainable management of hydrothermal resources in Suichuan. Proper management policies and practices are required for further development of Suichuan hydrothermal waters.

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Water-rock interaction, formation and circulation mechanism of highly bicarbonate groundwater in the northwestern geothermal prospects of Rwanda

Cited by 3 publications

References 55 publications

Geochemical survey of the Nyamyumba and Bugarama hot springs in the western province of Rwanda

Geochemical survey of the Nyamyumba and Bugarama hot springs in the western province of Rwanda

Hydrogeochemical similarities and groundwater-surface water interactions for the karst hydrological system of northwest Rwanda

Genesis of Geothermal Waters in Suichuan County, China: An Integrated Method Constrained by the Hydrochemical and Isotopic Characteristics

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