From: The impact of sewage effluents on water quality of Lake Hawassa, Ethiopia
Parameters | [20] WHO (2004)a | [16] WHO (2005)b | [21] Ethiopia EPA (2009)a | [6] EPA (1994)c | This study |
---|---|---|---|---|---|
EC (µS/cm) | 400 | - | - | 137–308 | |
Turbidity (NTU) | 5 | 5 | - | 4.3–22.8 | |
T (oC) | 25–30 | - | - | - | 21.4–25.3 |
TDS (mg/L) | 500 | 80 | 1000 | - | 88–155 |
pH | 6.5–8.5 | 6.0–9.0 | 6.5–8.5 | - | 7.1–9.3 |
Fe (mg/L) | 0.3 | - | 0.3 | - | 0.015–0.180 |
Mn (mg/L) | 0.4 | - | 0.5 | - | 0.20–0.67 |
Cr (mg/L) | 0.01 | - | 0.05 | - | 0.014–0.031 |
Cu (mg/L) | 1 | 2 | - | 0.01–0.33 | |
K (mg/L) | 20 | 1.5 | - | 9.2–28 | |
Fluoride (mg/L) | 1.5 | - | 1.5 | - | 4.0-7.4 |
Nitrite (mg/L) | 3.0 | - | 3.0 | - | 0.007–0.018 |
Nitrate (mg/L) | 50 | 50 | 50 | 13 | 1.6–89 |
Sulfate (mg/L) | 250 | - | 250 | - | 1.4–18 |
Phosphate (mg/L) | 0.02 | < 1 | - | 0.01 | 0.12–0.28 |