Waste point | |||
---|---|---|---|
−1 km | +1 km | Sering | |
*NTU, nephelometric turbidity unit; †MPN/100ml, most probable number/100 ml; ‡COD, chemical oxygen demand; §BOD, biological oxygen demand. | |||
Physical and biological: | |||
Temperature (°C) | 29 | 29 | 29 |
Total suspended solid (mg/l) | 15 | 14 | 11 |
Turbidity (NTU)* | 15.9 | 18.5 | 14.2 |
Coliform MPN/100ml† | 8 | 9 | 10 |
Faecal coliform MPN/100ml† | Nil | Nil | 6 |
Chemical: | |||
pH | 5.8 | 5.8 | 6.0 |
Total N as NH3 | 0.28 | 0.31 | 0.25 |
Nitrite | 0.01 | 0.01 | 0.01 |
Nitrate | 0.3 | 0.3 | 0.2 |
Phosphate | 0.01 | 0.01 | 0.01 |
Alkalinity | 10.0 | 8.5 | 8.2 |
Ca hardness | 2.5 | 2.1 | 2.5 |
Chloride | 4.52 | 4.96 | 4.62 |
Residual Cl2 | Nil | Nil | Nil |
COD‡ | 19 | 18 | 14 |
BOD§ | 4 | 3 | 4 |