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Table 2 Designated concentrations for pre-treatments

From: Improvement of anaerobic digestion of sewage mixed sludge using free nitrous acid and Fenton pre-treatment

Pre-treatments

FNA (mg FNA/L)

H2O2 (mg H2O2/g VS)

Fe+ mg Fe+/mg H2O2

pH

control

0

0

0

6.32

FNA

2.5

0

0

5.5

Fenton 1

0

2.5

0.0067

3

Fenton 2

0

5

0.0067

3

FNA + Fenton 1

2.5

2.5

0.0067

5.5 and 3

FNA + Fenton 2

2.5

5

0.0067

5.5 and 3