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Table 5 Chemical parameters of TPW

From: Tofu processing wastewater as a low-cost substrate for high activity nattokinase production using Bacillus subtilis

Parameter

Value

pH

5.02 ± 0.22

Total sugar (g/L)

4.9 ± 1.05

Total nitrogen (g/L)

0.91 ± 0.36

NH4+-N (g/L)

0.026 ± 0.005

Total phosphorus (g/L)

0.127 ± 0.017

BOD (g/L)

23.7 ± 2.17

COD (g/L)

46 ± 3

Solid content (g/L)

0.045 ± 0.012

Cu2+ (mg/L)

0.73 ± 0.18

Zn2+ (mg/L)

0.29 ± 0.13