Source of filtrate

Primary treatment organism

Removal of residual Cr (VI) (%) by degraded sawdust after:

4

8

12 weeks

Tannery effluent

^aA. niger

^bP. chrysogenum

96.5 ± 5.3

97.4 ± 5.5

ND

ND

ND

ND

Aqueous solution

^cA. niger

^dP. chrysogenum

89.2 ± 4.7

92.5 ± 5.0

ND

ND

ND

ND

Untreated tannery effluent

Control

59.3 ± 3.6

72.8 ± 4.5

75.2 ± 4.5