Effectiveness of Different Hand-Dug Well Treatment Methods in a Typical Basement Complex Environment

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Effectiveness of Different Hand-Dug Well Treatment Methods in a Typical Basement Complex Environment

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Abstract

The effectiveness of different treatment methods in the eradication of bacteria from contaminated hand-dug well within the crystalline rocks of Ile-Ife, Southwestern Nigeria was evaluated. Hydrogeological and geophysical investigations revealed that groundwater around the hand-dug well flowed from southeast to northwest. The area is underlain by four subsurface layers of topsoil, lateritic layer, clayey weathered layer, and fresh basement rock, with thicknesses of 3.2 m, 5.0 m and 35.7 m, respectively. Mechanical treatment of the hand-dug well was not effective as the most probable number (MPN) of bacteria count went from 150 cells/100 ml before treatment to 270 cells/100 ml after two weeks of treatment. Single and multiple chemical dosage treatment methods using chlorine of 0.5 mg/L were employed. Single dosage method reduced the MPN of bacteria count to 75 cells/100 ml, but did not eradicate the bacteria. The multiple chemical dosage method completely eradicated the bacteria, giving a MPN of bacteria count of 0 cells/100 ml. The multiple chemical dosage method was the most effective in the treatment of the contaminated hand-dug well.


Publication Info:

Author: Konwea, C.I. and Ajayi, O.

Volume: 57

Issue: September

Published By: Journal of Mining and Geology, 2024-09-01

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