Table 5.10a      Predicted Water Quality at the Fish Culture Zone (Cumulative Effluent Flow)

 

Parameter

Pollutant Concentration at FCZ

P1a

P1b

P2

STW1

STW2

Distance from the FCZ (m)

230

200

55

55

55

Wet Season

SS (mg/L)

14

16

41

47

16

BOD (mg/L)

2

4

30

35

3

TKN (mg/L)

0.56

0.85

4.92

5.81

5.81

NH3-N (mg/L)

0.24

0.41

2.96

3.51

2.82

Unionized ammonia3 (mg/L)

0.016

0.028

0.198

0.235

0.189

TIN (mg/L)

0.28

0.45

3.00

3.55

2.86

E. coli (counts/100 mL)

3.31E+05

6.27E+05

4.90E+06

5.83E+06

2.30E+02

Dry Season

SS (mg/L)

10

12

37

43

12

BOD (mg/L)

2

4

30

35

3

TKN (mg/L)

0.60

0.89

4.96

5.85

5.85

NH3-N (mg/L)

0.29

0.47

3.02

3.57

2.88

Unionized ammonia3 (mg/L)

0.020

0.032

0.202

0.239

0.193

TIN (mg/L)

0.43

0.60

3.15

3.70

3.01

E. coli (counts/100 mL)

3.31E+05

6.27E+05

4.90E+06

5.83E+06

2.93E+02

Note:

1          Overflow of untreated sewage

2          Overflow of treated sewage

3          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