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