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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