AOPs for water and wastewater treatment: UV/H2O2, Ozone-based AOP, photo-and electro-Fenton, heterogeneous photooxidation using TiO2, y-radiolysis, and sonolysis; Plasma technology for wastewater treatment; Electrochemical water treatment; Decentralized electrolytic systems for treatment of domestic wastewater, greywater, and source-separated urine.