Study On The Effect Of Ozone Preoxidation On Disinfection By-products In Water

The majority of domestic water by pre oxidation process to enhance the pollutant removal of micro polluted surface water,pre oxidant commonly used chlorine,chlorine dioxide,ozone,chlorine Potassium Permanganate,pre oxidant will produce three halomethane,Haloacetonitriles,disinfection by-products,research shows that three halomethane will cause damage to the liver at the same time,will increase the risk of cancer causing mutations.Ozone pre oxidation will not produce the disinfection by-products,but ozone pre oxidation will form the main disinfection by-products,which can be harmful to human body.In order to explore the impact factors of ozone preoxidation disinfection by-products,the experiments were designed to explore the ozonation of raw water and disinfection by-products of the effects of influence factors and pre ozonation dosage of water disinfection by-products of water containing algae.In this study,the influence factors of ozone pre oxidation on the formation of disinfection by-products in raw water and algae water were studied.The dosage of ozone water and bromide ion effect on bromate formation,when the raw water p H=7.8,ozone dosage increased from 0.5mg to 2.5mg,bromate production increased from 0.11 g/L to 0.49 g/L,ozone in the process increased from 1.5mg to 2mg,the fastest rate of ozone formation,bromate ion generation increased from 0.3 g/L to 0.43 g/L.When the dosage of ozone was 0.5mg,when the concentration of bromide ion in water increased from 4 g/L to 20 g/L,the amount of bromate ions increased from 0.13 g/L to 0.39 g/L.Bromate ions were less affected by p H,and pH increased from 0.1 to in the range of from 6 to 8,and the amount of bromate ions increased from g/L to g/L.The effect of ammonium salt on the removal of bromate ion was obvious.When the dosage of ammonium nitrate was increased from 0.4mg/L to 2mg/L,the amount of bromate ions was reduced from 0.13 g/L to 0.04 g/L.Activated carbon has a certain adsorption effect on bromate.When the dosage of activated carbon is increased from 5mg/L to 25mg/L,the amount of bromate ions is reduced from0.09 g/L to 0.005 g/L.Increasing the amount of ozone can reduce the amount ofbromate formation,and the more the more the last point of the decrease in the rate of bromate is getting slower and slower,the number of ozone points should be controlled at 2~3.When the number of ozone addition increased from one to four,the amount of bromate ions decreased from 0.16 g/L to 0.11 g/L.When the number of adding points was two,the rate of bromate ion reduction was the fastest,and bromate ion production decreased from 0.16 g/L to 0.13 g/L.