Table 2 The functional diversity indices for the contaminated with DTZ and control activated sludge at the beginning (start), 30th and 100th day of exposition to different concentrations of diatrizoate (0.2; 2.0 and 20 mg/L). The numbers in captions after underlying means the sampling day.

Start

0.43 ± 0.05

1.38 ± 0.01

28.60 ± 0.55

1.46 ± 0.04

Control_30

0.67 ± 0.06*

1.17 ± 0.05^a*

23.67 ± 4.51^a

0.94 ± 0.19^ab

0.2 mg/L_30

0.69 ± 0.01*

1.11 ± 0.01^a*

24.67 ± 1.15^a

0.80 ± 0.04^a*

2 mg/L_30

0.69 ± 0.01*

1.01 ± 0.07^b

18.67 ± 1.53^b

1.03 ± 0.03^b*

20 mg/L_30

0.69 ± 0.01

1.09 ± 0.03^ab

23.67 ± 1.53^a

1.26 ± 0.09^c*

Control_100

0.54 ± 0.01^A*

1.27 ± 0.02^A*

26.33 ± 0.58^A

0.84 ± 0.02^A

0.2 mg/L_100

0.62 ± 0.01^B*

1.18 ± 0.02^A*

26.67 ± 1.15^A

0.44 ± 0.07^B*

2 mg/L_100

0.65 ± 0.02^C*

1.15 ± 0.11^A

22.67 ± 2.08^B

0.23 ± 0.04^C*

20 mg/L_100

0.69 ± 0.01^D

0.96 ± 0.16^B

20.33 ± 1.53^B

0.07 ± 0.02^D*