Aerobic Biodegradation of Four Groups of Steroid Hormones in Activated Sludge

Table 2

Degradation parameters of the first-order kinetics model.

Analyte	First-order kinetics
	k1 (h^−1)	t1/2 (h)	r^2
Estrogens
E1	0.16	4.3	0.9407
αE2	0.26	2.7	0.9268
βE2	0.59	1.2	0.8909
EE2	0.08	8.7	0.9526
Androgens
T	1.51	0.5	0.9466
MT	0.57	1.2	0.9817
ET	2.02	0.3	0.9762
TBL	1.35	0.5	0.9773
BLE	1.56	0.4	0.9801
DEHA	0.67	1.0	0.9710
C-ADR	0.75	0.9	0.8941
Progestogens
P	0.28	2.5	0.9002
21α-HPT	0.26	2.7	0.8907
17α-HPT	0.30	2.3	0.8936
19-NT	0.49	1.4	0.9726
MPA	0.19	3.6	0.8935
19-NTD	0.28	2.5	0.9077
MGA	0.09	7.7	0.9930
Glucocorticoids
CRL	0.28	2.5	0.9712
17-CRLA	0.12	5.8	0.9454
21-CRLA	0.15	4.6	0.9199
17-CRLV	0.10	6.9	0.9587
21-CRLV	0.20	3.5	0.9120
BET	0.03	23.1	0.9770
DEX	0.04	17.3	0.9876
BETA	0.35	2.0	0.9262
DEXA	0.28	2.5	0.8992
COR	0.48	1.4	0.9521
CORA	0.32	2.2	0.9829