Effect of Removing Bromate from Water by UV/SO32-Process
Ultraviolet/sulfite(UV/SO32-)process is an advanced reduction process(ARP)that degrades contaminants by producing strongly reductive active free radicals.The efficiency and mechanism of degradation of bromate(BrO3-)by UV/SO32-process were studied.The results showed that the reduction of BrO3-by UV/SO32-process conformed to the pseudo-first-order kinetic model,and the removal rate of BrO3-could be effectively improved by increasing the UV light intensity,the dosage of sulfite,the pH value of solution,and removing dissolved oxygen(DO)in solution.HCO3,Cl-and natural organic matter in water inhibited the degradation of BrO3-.The quenching experiment showed that hydrated electron(eaq-)was the main active substance in the degradation of BrO3-by UV/SO32-process.The possible degradation pathway of BrO3-was deduced.
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