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Table 3 Physico-chemical parameters compared to Beninese and WHO standards

From: Assessment of the quality of effluent management from university hospitals in the Littoral department in Benin

Parameters

CNHU-HKM

CHU-MEL

HIA-CHU

CHUZ SL

SIBEAU

Standards Benin/WHO

I

O

I

O

FS

FS

FS

I

O

pH

7.05

7.08

7.00

7.34

7.17

7.05

7.66

7.65

7.45

6–9

T (°C)

22.90

22.60

22.40

22.50

21.62

25.50

27.71

27.80

28.2

≤ 30

SS (mg/L)

93.00

80.00

111.00

68.00

65.67

105.17

109.63

9256.0

8230.0

≤ 35a

COD (mgO2/L)

424.00

289.00

271.71

143.85

150.18

256.33

41.01

6452.0

5230.0

≤ 125 a

BOD5 (mgO2/L)

234.00

146.00

161.00

55.00

87.21

135.31

25.64

985.00

875.00

≤ 25 a

DO (mg/L)

0.69

3.51

3.70

4.20

0.69

1.19

1.55

1.08

1.76

> 5

Am (mg/L)

9.36

2.10

23.76

7.28

55.11

90.02

68.19

102.0

93.0

< 0.2

PT (mg/L)

17.9

12.16

29.06

26.77

42.83

55.98

31.87

875.0

805.0

≤ 10

  1. I Inlet, O Outlet, FS Septic tanks, pH potential of hydrogen, T Temperature, SS suspended matter, COD chemical demand in O2, BOD5 biochemical demand in O2, DO dissolved oxygen, Am Ammonium, PT total phosphorus
  2. aBenin standard