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
6.32
FNA
2.5
5.5
Fenton 1
0.0067
3
Fenton 2
5
FNA + Fenton 1
5.5 and 3
FNA + Fenton 2