TABLE 2.

MPN for three major trophic groups in sediments of treatment zone (day 774) in comparison with groundwater from control well FW106a

WellMPN estimate (cells/g sediment)
DenitrifiersFeRBSRB
FW1047.23 × 1089.40 × 1071.53 × 108
FW101-21.54 × 1082.05 × 1072.06 × 108
FW102-22.39 × 1075.48 × 1051.87 × 107
FW0261.10 × 1071.93 × 1061.07 × 106
FW106b3.3cNDND
  • a Wells are arranged according to their descending hydraulic connection to the injection well (FW104) based on the tracer studies. ND, none detected.

  • b Data on day 278 (47).

  • c No. of cells/ml.