Table 1 The physico-chemical quality indicators measured before and after EC treatment process (electrolysis time = 30 min and pH = 7, max voltage = 15 V) from the three textile effluents
Sites | Bahir Dar (BD) | Debre Brihan (DB) | Kombolcha (KO) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Water quality parameters | Before EC | After EC | RE (%) | Before EC | After EC | RE (%) | Before EC | After EC | RE (%) |
Nitrate (mg/L) | 9.24 | 1.50 | 84 | 0.85 | 0.06 | 93 | 2.00 | 0.97 | 52 |
Nitrite (mg/L) | 0.624 | 0.038 | 94 | 0.030 | 0.002 | 93 | 0.178 | 0.08 | 55 |
Phosphate HR (mg/L) | 1.8 | 0.9 | 50 | 18.0 | 9.4 | 48 | 14.0 | 6.4 | 54 |
Phosphate LR (mg/L) | 0.06 | 0.03 | 50 | 3.76 | 2.00 | 47 | 1.25 | 0.04 | 97 |
Ammonia (mg/L) | 8.00 | 1.00 | 88 | 20.00 | 2.60 | 87 | 0.63 | 0.02 | 61 |
Total nitrogen (TN) (mg/L) | 17.86 | 2.54 | 86 | 20.88 | 2.66 | 87 | 2.81 | 1.07 | 62 |
PH | 5.10 | 7.6 | – | 5.7 | 7.5 | – | 6.5 | 8 | – |
Conductivity(\(\mu\)s/cm) | 557 | 113 | 79 | 1257 | 140 | 88.86 | 631 | 102 | 83.84 |
Temperature (ºC) | 30.38 | 22.8 | – | 23.6 | 22.6 | – | 27.6 | 22.8 | – |
DO (mg/L) | 3.74 | 4.52 | – | 3.39 | 4.83 | – | 4.49 | 4.81 |  |
Turbidity (NTU) | 0.60 | 0.05 | 92 | 42.60 | 0.43 | 99 | 6.10 | 0.02 | 99 |
BOD (mg/L) | 4.45 | 1.54 | 65 | 4.69 | 1.59 | 66 | 4.19 | 1.65 | 61 |