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Table 1 Water quality parameters obtained from the grab samples collected from Seungki and Jungnang STPs

From: Toxicity characteristics of sewage treatment effluents and potential contribution of micropollutant residuals

Water quality parameter Seungki Sewage Treatment Plant Jungnang Water Reclamation Center
SK RW SK PE SK FE JN RW JN PE JN DSE JN FE
pH 8.1 ± 0.1 8.1 ± 0.2 7.9 ± 0.7 7.9 ± 0.3 7.9 ± 0.2 7.8 ± 0.2 7.8 ± 0.1
DO (mg/L) 6.1 ± 2.2 6.2 ± 2.6 8.2 ± 1.0 7.2 ± 1.0 7.5 ± 1.6 8.5 ± 0.1 8.7 ± 0.1
SS (mg/L) 68.3 ± 3.5 54.7 ± 6.4 29.3 ± 4.2 161.7 ± 26.2 41.3 ± 4.7 2.8 ± 0.4 1.9 ± 0.4
Alkalinity (mg/L CaCO3) 154.1 ± 27.2 178.6 ± 70.4 99.4 ± 16.3 118.1 ± 1.8 126.4 ± 3.0 57.5 ± 9.4 59.1 ± 6.2
Hardness (mg/L CaCO3) 201.7 ± 20.2 226.7 ± 25.2 170 ± 20 116.7 ± 28.9 126.7 ± 15.3 106.7 ± 5.8 105 ± 5
NH4-N (mg/L) 26.0 ± 1.4 21.7 ± 0.2 9.2 ± 0.2 21.7 ± 0.3 21.0 ± 0.2 1.7 ± 0.0 1.2 ± 0.8
NO3-N (mg/L) 16.1 ± 2.1 12.7 ± 1.1 8.6 ± 1.8 14.1 ± 1.0 13.8 ± 1.7 9.4 ± 1.4 6.4 ± 1.6
NO2-N (mg/L) 2.5 ± 0.0 1.9 ± 0.8 1.8 ± 0.6 3.2 ± 0.4 2.7 ± 0.7 1.7 ± 0.1 1.1 ± 0.1
PO4-P (mg/L) 3.9 ± 0.0 2.8 ± 0.1 0.9 ± 0.0 3.3 ± 0.0 1.9 ± 0.0 1.4 ± 0.1 0.60 ± 0.0