Table 5.10b     Predicted Water Quality at the Fish Culture Zone (Net Effluent Flow)

 

Parameter

Pollutant Concentration at FCZ

P1a

P1b

P2

STW1

P1a+P1b

Distance from the FCZ (m)

230

200

55

55

55

Wet Season

SS (mg/L)

14

13

35

17

15

BOD (mg/L)

2

2

24

5

4

TKN (mg/L)

0.56

0.43

3.95

0.98

0.74

NH3-N (mg/L)

0.24

0.15

2.35

0.49

0.35

Unionized ammonia2 (mg/L)

0.016

0.010

0.158

0.033

0.023

TIN (mg/L)

0.28

0.19

2.39

0.53

0.39

E. coli (counts/100 mL)

3.31E+05

1.88E+05

3.89E+06

7.64E+05

5.19E+05

Dry Season

SS (mg/L)

10

9

31

13

11

BOD (mg/L)

2

2

24

5

4

TKN (mg/L)

0.60

0.47

3.99

1.02

0.78

NH3-N (mg/L)

0.29

0.21

2.41

0.55

0.41

Unionized ammonia2 (mg/L)

0.020

0.014

0.162

0.037

0.027

TIN (mg/L)

0.43

0.34

2.54

0.68

0.54

E. coli (counts/100 mL)

3.31E+05

1.88E+05

3.89E+06

7.64E+05

5.19E+05

Note:

1         Overflow of untreated sewage

2         Unionised ammonia concentration was calculated based on 4.7% of unionised ammonia constituting the total ammonia concentration at 22.4oC, pH 8.1, and salinity of 31.7ppt