Effluent Concentration %

%Fish Mortality after 96hr (Sample-1)

%Fish Mortality after 96hr (Sample-2)

%Fish Mortality after 96hr (Sample-3)

C-Stage Effluent

0

0

0

0

30

30

20

30

50

70

40

60

70

80

70

90

E-Stage Effluent

0

0

0

0

30

40

30

50

50

80

70

70

70

90

70

90

H-Stage Effluent

0

0

0

0

30

20

25

30

50

40

35

40

70

60

55

70

Combined Bleach Effluent

0

0

0

0

30

20

30

20

50

50

65

45

70

70

75

70

Table 1: Fish Toxicity from bleach effluent of wood based mill at DO 7.3 to 7.7 mg/l and temperature of 25±2°C.