Evaluation of Waste Stabilization Pond Efficiency and Its Effluent Water Quality: a Case Study of Kito Furdisa Campus, Jimma University, Southwest Ethiopia

Table 4

Water quality index of effluent of the WSP system in Kito Furdisa Campus, Jimma University, Jimma town, Southwest Ethiopia, 2020.

Parameters	Number of tests					EEPA [23]
	T1	T2	T3	T4	T5
pH	8.5	8.5	8.44	8.49	8.56	6–9
DO (mg/L)	2.2	2.05	2.12	2.18	2.15	≥5
Temperature (^OC)	22.3	20.9	22.5	22.6	21.2	≤40
Turbidity (NTU)	125.2	122.6	120.5	122.7	123	≤300
EC (μS/cm)	850	850.5	850.8	851.2	851.6	≤1000
BOD5 (mg/L)	116.7	117.7	116.5	117.1	116.4	≤25
COD (mg/L)	455	460	457.5	461	460.1	≤125
TSS (mg/L)	220	221	220.5	225	220.5	≤50
TN (mg/L)	19.5	16.4	15.5	19.2	16.2	≤20
NH3-N (mg/L)	1.15	1.23	1.16	1.23	1.17	≤10
NO3^− (mg/L)	0.21	0.16	0.15	0.22	0.15	≤45
TP (mg/L)	4.6	4.8	5	6	4.8	≤1
PO4^−3 (mg/L)	3.5	3.3	3.27	3.6	3.3	≤0.02
Total coliform (MPN/100 mL)	3.5 × 10^3	3.28 × 10^3	3.45 × 10^3	3.56 × 10^3	3.45 × 10^3	≤50
Fecal coliform (MPN/100 mL)	8.02 × 10^2	8.25 × 10^2	8.15 × 10^2	8.03 × 10^2	8.1 × 10^2	≤10

 = do not meet the guideline EEPA = Ethiopian Environmental Protective Authority.