Time (h) 0 24 48 72 96 P-value
TSS (g/l) 1.22±0.02 2.01±0.32 3.77±0.22 4.82±0.18 4.84±0.2 <0.001
pH 5.01±0.2 4.590±0.045 3.37±0.049 3.12±0.014 3.22±0.035 0.002
COD (g/l) 13.7 ± 2 9.47±0.58 6.25±0.94 5.29±0.28 4.75 ±0.17 0.003
OD at 390 nm 2.4±0.12 2.1±0.01 1.39±0.02 0.93±0.06 0.91±0.11 0.003
Polyphenols
(mg gallic acid/l)
496±10.3 426±8 307±11 262±15 256±9 <0.001
Table 5: Time course of biomass, pH, residual COD, residual OD390 and polyphenols during the pretreatment of TOPW by Aspergillus niger.