Mud-free heterogeneous catalytic fluidized bed oxidation technology recycles red mud generated by Fenton or heterogeneous catalytic oxidation process , therefore no solidwaste is generated in the heterogeneous catalytic oxidation, thus realizing the recycling of iron and carbon and having higher economic and environmental benefits.

(1) the efficiencies of chemical oxidation and mass transfer are promoted by high efficient fluidized bed oxidation, the COD removal ratio is greatly improved.

(2) the operation is simplified, and the operation cost is reduced.

(3) the dosage of H2O2 is reduced thus decreasing the operation cost.

(4) the reaction time is short, the equipment volume is small, and the occupied area is greatly saved.

(5) the technology is environmentally friendly and harmless.

(6) small floor space for space saving.

(7) control the concentration of discharged wastewater effectively.

● Pretreatment of refractory wastewater,  such as refractory wastewater from petrochemical, agricultural, chemical, pharmaceutical, leather and textile industries. The technology reduce the organic pollution of wastewater greatly, thus improving the biodegradability of the wastewater.