Wastewater management involves treating various sources of water pollution using advanced oxidation processes like photo-Fenton oxidation. Photo-Fenton oxidation uses UV light, hydrogen peroxide, and iron ions to produce hydroxyl radicals that effectively eliminate organic pollutants through oxidation. The process parameters that affect photo-Fenton oxidation include pH, hydrogen peroxide dose, irradiation time, and initial iron ion concentration. Photo-Fenton oxidation shows potential for treating industrial wastewater for reuse in fertilizer production after further treatment.

1. Wastewater Management using
Photo-Fenton Oxidation

2. Wastewater Management
• What is wastewater?
– domestic effluent
– water from commercial establishments
– industrial effluent
– agricultural, horticultural and aquaculture effluent
• What is wastewater management?

3. Advanced Oxidation Processes(AOPs)
• What are AOPs?
– Removal of Organic materials from wastewater by
oxidation through reactions with hydroxyl radical.
• Types
– UV/H2O2
– Ozone based AOP
– Photo catalytic oxidation with TiO2

4. • Advantages
– Effectively eliminate all organic pollutants
– Due to excellent reactivity of OH radical, it reacts
with all aqueous pollutants
– Some heavy metals can also be removed in the
form of Metal hydroxide.
– Complete reduction product is water; no other
hazardous substance is formed.
• Shortcomings
– Expensive
– Pre-treatment might be required.

5. Photo-Fenton Oxidation
• What is photo-fenton oxidation?
– Hydroxyl radicals produced due to UV/H2O2/Fe2+
or Fe3+
– H2O2 acts as oxidant ; Iron ions act as catalyst; UV
light enhances the production of hydroxyl radicals
and also recycles Fe ions.
• Parameters
– pH, H2O2 dose, FeSO4.7H2O dose, Irradiation time

6. REACTION

7. Effect of irradiation time

8. Effect of the pH value

9. Effect of hydrogen peroxide
concentration

10. Effect of initial amount of Fe ion

11. Application
• Dyes containing nitrogen and sulphur atoms;
after treatment can be used as a fertilizer after
addition of Potassium and Phosphorous salts.