TABLE 1

Identification of NOB present in BF1 and BF2 by genus-specific PCR and TEM

Biofilter and sampling date (mo/yr)PCRaTEMb
NitrotogaNitrospiraNitrobacterNitrotogaNitrospiraNitrobacter
BF1
    07/2010+++++++
    10/2010++
BF2
    11/2010+++++
    12/2010++
    03/2011++
    06/2011++++
    07/2011++
    08/2011+++
    09/2011+++
  • a +, positive reaction; −, no reaction.

  • b +, present; −, not present. The number of plus signs reflects the approximate abundance of the respective NOB visible via TEM.