Table 3 Concentration and frequency of detection of the target illicit drugs and their metabolites in the influent and effluent (ng/L)

METH

 Influent

5.13

1.95

51.62

1.21

35.61

1.20

6.58

45.08

100.00

 Effluent

0.38

0.47

16.59

< LOD

8.24

0.74

19.71

22.44

87.50

AMP

 Influent

8.11

1.43

< LOD

2.22

2.82

1.19

10.29

4.27

87.50

 Effluent

< LOD

1.03

1.06

< LOD

< LOD

1.06

1.22

1.29

62.50

KET

 Influent

1.72

0.78

0.78

0.90

2.50

1.05

0.87

0.96

100.00

 Effluent

< LOD

0.19

0.86

0.35

1.21

0.70

0.94

1.01

87.50

NK

 Influent

0.38

< LOD

0.73

0.34

< LOD

0.23

0.16

< LOD

62.50

 Effluent

0.58

0.27

0.36

0.31

< LOD

0.18

0.33

0.18

87.50

COD

 Influent

10.71

< LOD

< LOD

0.80

0.81

0.40

0.42

0.94

75.00

 Effluent

0.00

0.42

0.34

0.61

< LOD

0.46

0.30

0.39

75.00

HR

 Influent

0.00

0.38

0.30

0.74

0.37

0.46

6.99

< LOD

75.00

 Effluent

1.53

0.34

0.42

0.69

0.34

0.43

1.81

0.40

100.00

MET

 Influent

0.44

1.24

0.14

0.60

< LOD

0.72

< LOD

0.09

75.00

 Effluent

< LOD

0.09

< LOD

0.19

< LOD

0.10

< LOD

0.10

50.00

COC

 Influent

0.75

0.38

0.18

0.51

0.18

0.30

0.19

0.21

100.00

 Effluent

0.49

0.19

0.18

0.40

0.18

0.20

0.19

0.19

0.00

BE

 Influent

< LOD

0.19

< LOD

< LOD

< LOD

< LOD

< LOD

< LOD

12.50

 Effluent

< LOD

< LOD

< LOD

< LOD

< LOD

< LOD

< LOD

< LOD

< LOD

MDMA

 Influent

0.48

0.00

0.30

0.55

0.00

0.21

0.26

0.18

75.00

 Effluent

0.67

0.18

0.49

< LOD

0.21

0.22

< LOD

0.19

75.00

MDA

 Influent

1.75

0.24

2.74

< LOD

< LOD

1.10

4.85

2.18

75.00

 Effluent

0.60

< LOD

0.24

< LOD

0.46

0.25

2.36

0.39

75.00

MC

 Influent

0.61

0.28

2.16

0.95

< LOD

2.69

6.58

1.62

87.50

 Effluent

0.50

0.67

0.18

1.23

0.31

0.19

< LOD

0.58

87.50