Improvement In Quality Of AMD Contaminated Water By Treatment With Limestone And Filtration Through Activated Charcoal And Sand Filter

IJEP 41(1): 114-120 : Vol. 41 Issue. 1 (January 2021)

Ribha I. Passah and O. P. Singh*

North-Eastern Hill University, Department of Environmental Studies, Shillong – 793 022


Unscientific coal mining in Jaintia Hills, Meghalaya has severely degraded the environment of the area. The water of the area has become highly acidic and contaminated with different impurities making the water unsuitable for domestic and irrigation uses leading to scarcity of clean water in the mining area. Acid mine drainage (AMD) has been recognized as the main cause of water pollution. This calls for an urgent action to improve the quality of water to ease the water stress in the area. Laboratory experiments involving treatment of acidic water using locally available limestone and subsequent filtration through the layers of activated charcoal and sand yielded promising results towards the improvement of water quality. Treatment with limestone raised the pH from 2.8-7.31, well within the acceptable limit. Subsequent filtration improved the water quality further by bringing the values of calcium, turbidity, total dissolved solids (TDS), alkalinity and metals, such as zinc and aluminium within the acceptable limits prescribed by Bureau of Indian Standards. The promising results of the present study can be used for designing suitable filtration units for domestic uses as well as for treatment of stream water for irrigation and ecological purposes.


Acid mine drainage, Coal mining, Improvement in water quality, Neutralization by limestone, Filtration with charcoal and sand


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