Table 4 Operational conditions and observed results of Fenton-based oxidation to various types of wastewaters.

Textile

COD = 2400 mg L^–1

T = 50 °C, pH = 3, H₂O₂/Fe²⁺ = 95-290

Room temperature, pH = 3, H₂O₂/Fe²⁺ = 1.2, H₂O₂/COD = 0.0037 (w/w). t_reaction = 4–6 h, V_reactor = 400 mL

COD: 95%

²⁷⁹

COD = 8100 mg L^–1, BOD₅/COD = 0.148, TOC = 3010 mg L^–1

COD: 45%, TOC: 40%, Color: 71.5%

²⁸⁰

Fe²⁺/H₂O₂ = 1:20-1:100

t_reaction = 1 h

Color: 100%

TOC: 74.2%

²⁸¹

Pesticides manufacturing

Atrazine = 0.01 mM

pH = 2, H₂O₂/Fe²⁺ = 0.33–3

atrazine = 15%-98%

²⁸²

Triazophos = 0.06 wt%

COD = 3242 (synthetic wastewater)

pH = 4, [FeSO₄.7H₂O] = 2.5 g L^–1, 100 mL L^–1 of 30% H₂O₂ solution added, stirring time = 90 min

COD: 96.3% (synthetic), nitrogen: 71.2%, phosphorous_: 68.5%

¹³¹

Petrochemical industry

p-nitroaniline = 0.072-0.217 mM (synthetic)

T= 20 °C, pH = 3, V_reactor = 200 mL (batch), t_reaction = 30 min

Solar light

p-nitroaniline >98%

²⁸³

Phenol = 0.1 g L^–1 (synthetic water)

T = 25 °C, pH = 3, V_reactor = 250 mL (batch)

Fe²⁺/H₂O₂ = 0.01-0.2 mM

Fe sources: FeSO₄.7H₂O, Fe₂(SO₄)₃.9H₂O, Fe⁰

Initial concentration of Fe catalyst = 0.5–1 mM

Phenol : 97.6 % (UV/Fe²⁺/H₂O₂)

Phenol: 97.2% (UV/Fe³⁺/H₂O₂)

Phenol: 84.8% (UV/Fe⁰/H₂O₂)

COD: 97.5%

²⁸⁴

Pharmaceutical

COD = 900–7000 mg L⁻¹ (synthetic)

pH = 3.5,

H₂O₂/Fe²⁺ = 155

COD: 45-65%

²⁸⁵

COD = 4061 mg L⁻¹

Berberine = 709 mg L⁻¹

BOD₅/COD = 0.3

pH = 3, H₂O₂/COD = 1.25, Fe²⁺/H₂O₂ = 0.1,

Flow rate = 100 L/h (continuous), HRT = 2.5 h

COD: 35.6%

Berberine_: 91.4%

²⁸⁶

Pulp and paper

COD = 1384 mg L⁻¹

TOC = 441 mg L⁻¹

T = 25-70 °C, pH = 2.8

H₂O₂/COD = 7.22 (w/w), H₂O₂/Fe²⁺ = 41

V_reaction = 100 mL, t_reaction = 2 h

[141] = 0–800 mg L^–1, ([188]) = 0–10,000 mg L^–1

TOC: 91%

²⁸⁷

TOC = 110 mg L^–1

T = 23-27 °C, pH = 5, H₂O₂/Fe²⁺ = 20

TOC: 87.5%

²⁸⁸

Landfill leachates

COD = 1000, and 4000 mg L^–1

pH = 2.5, H₂O₂/Fe²⁺ = 3

COD: 89.2% and 68.2%

²⁸⁹

COD = 5700 ± 300 mg L^–1, BOD₅/COD = 0.88

Mg²⁺ = 172 mg L^–1

pH = 3.5, H₂O₂:Fe²⁺ = 19.1

COD: 66%

²⁹⁰