Narrow Results

Effect of vortex cavitation in the different of cavitation treatment time, turbine outlet pressure, and solution temperature on the residuals of SO₃²⁻ and Ca²⁺ in the sugarcane juice clarified with sulfitation process was studied in the paper. The experimental results showed that the vortex cavitation can enhance the reaction of SO₃²⁻ and Ca²⁺ to the precipitation of CaSO₃, and reduce the residues of SO₃²⁻ and Ca²⁺ in the sugarcane juice effectively. The longer cavitation treatment time, the lower residuals of SO₃²⁻ and Ca²⁺ in the sugarcane juice; The greater turbine outlet pressure, the lower residuals of SO₃²⁻ and Ca²⁺ in the sugarcane juice; The greater solution temperature, the lower residuals of SO₃²⁻ and Ca²⁺ in the sugarcane juice.

The radicals of ·OH and ·H are generated as cavities collapse. The hydroxyl radical, having strong oxidizing property and depending on the cavitation intensity, can react with refractory organic compound molecule. Using the choking cavitator as a cavitation generator, the influences of hydroxyl radical production on the initial concentration of methylene blue (MB), equivalent diameter of back-pressure holes and reaction time were analyzed with a visible spectrophotometer. The experimental results showed that the highest hydroxyl radical was acquired when the equivalent diameter of back-pressure holes was 5.4mm and the initial concentration of MB was 12mg/L.