The stored wastes and extracted heap of materials are the major concern in abandoned open
cast pits (OCP) of coal mine area. They adversely affect the pit water and surrounding mining
areas. Due to oxidation of pyrites in deep coal layers and debris stored on the surrounding
surface areas, in presence of air and water directs to very low pH, heavy and rare earth metals
dissolved into the pit water. In the present study, the Physico-chemical features in respect of
different pollutants and that correlate in-between different parameters considering three
seasons of abounded Damalia OCP have been investigated. Pollutant contamination in the pit
is mainly due to the drainage of mine water. Nutrient pollutant level is within the permissible
limits, like No3-N, dissolved phosphate. Water samples were analysed and it is found that
total hardness as CaCo3, total alkalinity as CaCo3, TSS, dissolved oxygen (DO), BOD, COD,
Cl are within permissible limit, whereas TDS, HCO3
-value exceeds the standard limit. It is
also seen that level of nitrate pollutants, i.e. NH3-N, Cl2, FA-NH3,S2-, TKN, are under
permissible limit but TKN percentage is higher than other pollutants. The results indicate
highly acidic condition of the drain-water with low DO, high rate of TDS and HCO3-, high
hardness and higher concentrations of CaCo3 and may be usable after proper treatment.
Keyword: Abandoned OCP, BOD, COD, DO, TSS, TDS
Publication date: 01/03/21
https://ijbpas.com/pdf/2021/March/MS_IJBPAS_2021_5412.pdf
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https://doi.org/10.31032/IJBPAS/2021/10.3.5412
