Advanced oxidation technology
In recent years, advanced oxidation technology has been applied in the field of refractory organic wastewater treatment, and obtained good result, so it becomes a hot topic in the industry circles.
Owing to its strong oxidizing power and rapid decomposition in water without generating secondary pollution, ozone is an ideal green oxidant. Consequently, ozone oxidation has gradually emerged as the primary method among advanced oxidation technologies.
The principle of ozone oxidation
In aqueous solution, the oxidation of ozone and the reaction mechanisms for organic pollutants primarily involve two types: direct oxidation and free-radical–mediated indirect oxidation. In a given reaction system, direct oxidation typically occurs when ozone directly reacts with organic compounds, whereas indirect oxidation is more prevalent when ozone generates reactive free radicals that subsequently oxidize the pollutants. The pH of the solution significantly influences the dominant oxidation mechanism: in strongly acidic media, direct oxidation predominates, while in alkaline media, free-radical–mediated indirect oxidation becomes the primary pathway.
Influence factors of ozone oxidation
Excellent shock resistance, with no sludge bulking issue.
Ozone oxidation with mixed air intake—when the ozone intake rate per unit time increases, the oxidation reaction rate of organic matter improves accordingly.
Mixing speed—select the appropriate mixing speed to ensure minimum energy consumption while achieving thorough mixing of air and liquid.
The removal rate of pollutants under alkaline conditions is higher than under acidic conditions.
Liquid temperature—choose an appropriate temperature to balance the activation energy of the reaction and the decomposition rate of ozone.
Catalyst—accelerate the rate of ozone oxidation
Dosing method of gaseous ozone—choose an appropriate dosing method to ensure the diffusion velocity of ozone molecules and the reaction rate of pollutants in the water.
Introduction of rotary mixing ozone reactor
This reactor employs the principle of maximizing gas displacement by introducing the ozone-containing wastewater into the reactor. As the internal impellers rotate in both forward and reverse directions, effective turbulence is generated, thereby maximizing the contact area between the ozone bubbles and the wastewater. In this manner, the oxidation efficiency of the injected ozone is optimized, and ozone utilization is maximized.
High ozone utilization efficiency, ≥97%
Short standing time, ≤1 min
Good effluent quality, COD ≤ 30 mg/L.
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