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