Study On Ozone Micro-nano Air Floatation Technology For The Cation Red X-GRL

With the reform and innovation of the printing and dyeing industry,cationic dye wastewater is playing an increasingly important role in printing and dyeing industrial wastewater.Cationic dye wastewater has the characteristics of high wastewater discharge,complex components,obvious water quality changes,poor biochemical properties,and high chroma.In particular,the pollution index of chroma ranks first in the dye industry.In this regard,this article aims to find an effective new water treatment process.In this paper,ozone gas is used as the gas source,and the cationic wastewater simulated by cationic red X-GRL dye is treated by micro-nano bubble aeration.The basic parameters and characteristics of micro-nano air flotation and traditional air flotation are compared.Removal efficiencies of chroma,COD_Cr,UV₂₅₄ in simulated cationic wastewater by different gas sources and different aeration methods.According to the characteristics of the ozone micro-nano air flotation process,after determining the optimal reaction time and the optimal initial dye concentration,analyze the ozone-micro-nano under three single-factor conditions:initial p H,ozone inlet concentration,and micro-nano bubble aeration.Effect of bubble aeration on dye wastewater treatment.Three factors and three levels were selected to design orthogonal optimization experiments to determine the best combination of factor levels.At the same time,the proportion of each factor to the wastewater treatment effect was examined.In the comparison experiment between micro-nano bubbles and ordinary dissolved air bubbles,the average residence time of micro-nano bubbles aeefficienciesd in a 500 m L graduated cylinder is longer.The ozone mass transfer coefficient and average ozone utilization efficiencies of micro-nano bubbles are ordinary dissolved gas bubbles.1.7 times and 1.4 times,and four different aeration methods were used to treat the simulated wastewater at the same time.The ozone-micro-nano bubble chroma,COD_Cr,UV₂₅₄ removal effect was the best.In the single-factor effect experiment of the ozone-micro-nano bubble system,the higher the initial p H value in the cationic wastewater,the better the removal effect of the three pollutant indicators.The optimal p H value is 11,but the most suitable p H value is considered comprehensively 9;By changing the ozone inlet concentration,it is found that by controlling the ozone concentration of the gas source to increase it,the removal efficiencies of each pollutant in the wastewater is also enhanced,and the optimal ozone concentration is 10.3mg/L;Among the effects of the treatment effect,the experimental results found that too high or too low aeration has disadvantages in the removal of cationic wastewater.The optimal micro-nano bubble aeration is 2.5 L/min.Based on the three single factors of initial value of cationic wastewater p H,ozone inlet concentration,and micro-nano bubble aeration,three levels of each factor were taken to design orthogonal experiments.The experimental data obtained through orthogonal experiments are systematically calculated.Based on the final range R,the optimal orthogonal combination is obtained.The decolorization of the cationic red X-GRL dye wastewater by the ozone inlet concentration in three single factors is obtained.The combination with the greatest impact and the best effect on cationic wastewater treatment is:the initial p H of the wastewater is 9,the ozone inlet concentration is 10.3 mg/L,and the micro-nano bubble aeration volume is2.7 L/min.