Identification of physical mechanism of hybrid advanced oxidation processes (HAOPs).
Approach of coupling experiments with simulations of cavitation bubble dynamics.
Role of sonolysis in HAOPs is mostly of physical nature.
Positive synergy in binary HAOPs of sonolysis + Fenton-like and sonolysis + photo ferrioxalate.
Negative synergy in ternary HAOP of sonolysis + Fenton-like + photo-ferrioxalate.