Table 3 Specific activity of AOB and NOB in lab-scale and full-scale WWTPs

Our study (average)

321.94 ± 154.19

22.99 ± 11.01

132.028 ± 39.06

9.43 ± 2.79

Other studies

Full-scale

Limpiyakorn et al. (2005)

–

0–49.6

–

–

Harms et al. (2003)

–

7.7 ± 6.8

–

–

Daims et al. (2001)

–

16–43

–

–

Fujita et al. (2010)

–

1.1–11.9

–

2.4–21.6

Belser and Schmidt (1980)

–

9–123

–

–

Lab-scale

Copp and Murphy (1995)

175

–

–

–

Sun (2004)

109

–

–

–

Hanaki et al. (1990)

70

–

–

–