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Effects of ferric/ferrous ratio on performance of successive alkalinity producing system (SAPS) during acid mine drainage treatment
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Author :M. D. Patel*, R. K. Jade, P. K. Dewangan and A. K. Dash
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ABSTRACT
Acid mine drainage (AMD) is becoming a serious threat for mine and its adjoining area. Therefore, the proper management of mine impacted water is essential before discharging it into natural water source. The laboratory successive alkalinity producing system (SAPS) is found effective in treatment of AMD. The SAPS was designed using cow compost, saw dust and limestone. Twelve synthetic AMDs were experimented in SAPS with variation in ferric/ferrous ratio (FFR) and total iron (TI). The performance of SAPS was assessed in terms of net alkalinity generation (NAG) for different hydraulic retention time (HRT). The higher net alkalinity generation by SAPS was found for higher ferric/ferrous ratio (FFR) and total iron (TI). It is also found that the net alkalinity generation increases with increase in HRT duration from 1 day to 10 days. The above findings can be utilized for effective design and operation of SAPS for treatment AMD.
KEYWORD
Acid mine drainage, successive alkalinity producing system, ferric/ferrous ratio