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|Title: ||Arsenic Intensity Risk Assessment at AngloGold Obuasi Goldmine, Ghana, West Africa: Using Sorption and Geotechnical Factors|
|Authors: ||Nude, P. M.|
Gawu, S. K. Y.
Gidigasu, S. S. R.
Sakyi, P. A.
|Issue Date: ||2016|
|Publisher: ||West African Journal of Applied Ecology|
|Citation: ||West African Journal of Applied Ecology, vol. 24(2), 2016: 1–17.|
|Abstract: ||This research evaluated arsenic (As) intensity risk using sorption and geotechnical factors in the AngloGold
Obuasi mine environment in Ghana. Water samples from tailings dam boreholes and surface stream were
analysed for As contents over a time period of 24 months and over a distance of about 9 km respectively, under
closed conditions, where there are no more discharges of waste. The porosity and bulk density of the subsurface
material were also determined. Data generated from the mass-time and mass-distance analysis were used to
establish As intensity risk assessment model based on documented global As impact data. From the model, a
period of about 4 years is required in monitoring boreholes and a distance of about 12 km is required along the
stream profile for As concentration to reduce from the maximum value of about 2.50 mg/l to 0.01 mg/l. Using
the porosity, bulk density and combined degradation properties of the monitored media of the mobile As, the
estimated retardation factor was 1.96 and the solute velocity estimated to be 1.53 ´ 10 ms in the borehole
environment, and 1.074 and 9.25 ´ 10-1 ms-1 along the streambed, respectively. This study shows that the
pollution risk assessment model can be used to spatially estimate exposure to As contamination in the
environment, while the transport characteristics can be used to determine clean-up criteria for effective As
remediation in drainage.|
|Description: ||An article published by West African Journal of Applied Ecology|
|Appears in Collections:||College of Engineering|
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