Physicochemical parameters

Sampling sites along the wastewater channel

Discharge limit values

E1

E2

E3

FEPA

EEPA

Temperature (˚C)

26.97 ± 0.06

26.00 ± 0.01

24.93 ± 0.06

<40

40

pH

9.33 ± 0.06

8.89 ± 0.01

8.33 ± 0.01

6 - 9

6 - 9

EC (µS∙cm−1)

15670.00 ± 20

14830.00 ± 10

14496.67 ± 40.41

2500

-

TDS (mg∙L−1)

9370.00 ± 10

8890.00 ± 8.1

8723.33 ± 5.77

2000

-

TSS (mg∙L−1)

4979.33 ± 26.86

3540.00 ± 20

2647.67 ± 7.50

30

50

Chloride (mg∙L−1)

6111.67 ± 73.2

5615.77 ± 24.8

5555.78 ± 23.74

600

1000

BOD5 (mg∙L−1)

960.34 ± 33.24

852.00 ± 29.21

842.00 ± 27.5

50

200

COD (mg∙L−1)

2011.00 ± 45.67

2000.45 ± 43.5

1950.75 ± 39.2

500

500

Total ammonia (as N) (mg∙L−1)

520.44 ± 29

430.34 ± 25.44

401.23 ± 23.5

30

Total nitrogen (as N) (mg∙L−1)

720.46 ± 33.5

691.11 ± 31.44

665.43 ± 28.5

60

Total phosphorus (as P) (mg∙L−1)

30.12 ± 3.11

24.33 ± 2.23

19.55 ± 1.55

10

Sulphide (as S) (mg∙L−1)

35.56 ± 4.55

29.39 ± 3.45

21.05 ± 2.7

0.1