Review Article

Removal of Organic Matter from Landfill Leachate by Advanced Oxidation Processes: A Review

Table 4

Fenton, photo-Fenton, and electro-Fenton treatments of leachates.

Initial characteristic of leachateCODBOD/CODOptimal conditionReference
COD (mg/L)BOD (mg/L)pHRemoval (%)after treatment

Fenton

1300308.7pH: 3.5, Fe2(SO4)3: 500 mg/L, H2O2: 1650 mg/L[39]
8298–88946.65-6.69pH: 2.5, H2O2/Fe2+ (molar ratio): 1.5, reaction time: 30 min[44]
1054023008.2600.5pH: 3, Fe2+: 275 mg/L, H2O2: 3300 mg/L, reaction time: 2h[49]
837–611942.50–620.008.09–8.4780
(young leachate) 60~70
(old leachate)
pH: 2.5, H2O2/Fe2+ (molar ratio): 1.5, [H2O2]: 0.075 M[46]
1100–13008.1861pH: 3, [H2O2]: 0.24 M, H2O2/Fe2+(molar ratio): 3[47]
88946.65–6.6989pH: 2.5, [H2O2]: 0.15 M, H2O2/Fe2+ (molar ratio): 3[48]
660.88pH: 3.5, H2O2: 650 mg/L, H2O2/Fe2+ (molar ratio): 1 : 19[50]

Photo-Fenton

38246807.9486Fe2+: 2000 mg/L, H2O2: 10000 mg/L[51]
490.4pH: 2.8, Fe2+: 10 mg/L, H2O2: 2000 mg/L[52]
11504.670pH: 3, Fe2+: 56 mg/L, H2O2: 34 mg/L, UV: 80 KW/m3[53]

Electro-Fenton

50006.483.4pH: 3, H2O2: 0.34 mol/L, Fe2+: 0.038 mol/L, I: 2 A,d = 2.1 cm[54]
23502.3672pH: 3, H2O2: 2000 mg/L, I: 2 A, reaction time: 20 min[55]
19411958.1690.29pH: 4, H2O2: 750 mg/L[56]