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Table 1 Characterization of original acid mine drainage (AMD) and influent water for the bioreactor

From: Hydraulic retention time and pH affect the performance and microbial communities of passive bioreactors for treatment of acid mine drainage

  Original AMD Influent watera
Neutral condition Acid condition
pH 3.53 6.25 3.02
ORP (mV) 361 221 531
Sulfate (mg l−1) 320.2 315.9 312.5
Zn (mg l−1) 16.29 14.93 16.59
Fe (mg l−1) 36.49 1.36 5.90
Cu (mg l−1) 6.48 4.21 5.13
Cd (mg l−1) 0.070 0.061 0.054
Al (mg l−1) 8.55 2.63 7.68
Ca (mg l−1) 13.15 71.88 13.77
  1. aOriginal AMD was initially passed through an iron-oxidation reactor, and resultantly, the iron concentration became approximately 5 mg l−1. In the neutral condition, iron-treated AMD neutralized with limestone (pH 6.3) was used, while iron-treated AMD (pH 3.0) was used in the acid condition