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Table 2 Levels and code of variables

From: Process optimization and effect of thermal, alkaline, H2O2 oxidation and combination pretreatment of sewage sludge on solubilization and anaerobic digestion

Variables

Symbols

Range and value of variables

0 (Low)

1 (Medium)

2 (High)

Temperature (°C)

A

25

75

90

Alkalinity (pH)

B

8

10

12

H2O2 concentration (mg/ g TS)

C

0

30

60