Assessment of Groundwater Suitability for Industrial Purpose in Oredo LGA of Benin City, Nigeria Using Langelier Saturation Index
Abstract
Most industries make use of groundwater resources not only where surface water is limited in quantity but also where quality is paramount. However, corrosion is an inherent problem associated with some groundwater, and it is a pernicious process that impairs the efficiency of industries. Hydro-chemical parameters (such as pH, electrical conductivity, hardness, etc.) provide valuable information, but they do not cover all aspects of industrial suitability. The presence of certain ions (e.g., Na+, Ca2+, and Mg2+) can lead to corrosion behavior in groundwater, and the ionic exchange between these ions can affect the stability of pipes, machinery, and infrastructure used in industrial operations. Hence, different techniques (besides hydrochemical) are now being used to evaluate the suitability of groundwater for industrial uses. In this study, groundwater samples were randomly collected from fifteen different boreholes in the Oredo Local Government Area and investigated for their suitability for industrial purposes. These samples were collected within the period of May to June 2023. In order to assess the groundwater quality, these samples were analyzed for some selected parameters, namely: pH, Temperature, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Dissolved Oxygen (DO), Bicarbonate (HCO3-), Calcium (Ca2+), Magnesium (Mg2+), Potassium (K+), Sodium (Na+), Chloride (Cl-), Nitrite (NO2-), Nitrate (NO3-), Sulfate (SO42-), Iron (Fe), Zinc (Zn), Copper (Cu), Manganese (Mn), Ammonium Nitrogen (NH4N), and Coliforms. Based on this, the Langelier Saturation Index (LSI) was used to determine the suitability of groundwater for industrial purposes. The results of the groundwater quality analysis revealed that the groundwater is warm and acidic in nature. The LSI results indicated that the groundwater has a high corrosion tendency; thus, there is a possibility for corrosion to take place in industrial equipment when used, which may hinder the efficiency of the industry. Therefore, regular monitoring and treatment of the groundwater before industrial use are essential.
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