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Formation control of bromate and trihalomethanes during ozonation of bromide-containing water with chemical addition: Hydrogen peroxide or ammonia?

Zhengdi Wu  Yubin Tang  Weiwei Li  Zhimin Qiang  Huiyu Dong  
【摘要】:To ensure the safety of drinking water,ozone (O_3) has been extensively applied in drinking water treatment plants to further remove natural organic matter (NOM).However,the surface water and groundwater near the coastal areas often contain high concentrations of bromide ion (Br~-).Considering the risk of bromate (Br O_3~-) formation in ozonation of the sand-filtered water,the inhibitory efficiencies of hydrogen peroxide (H_2O_2) and ammonia(NH_3) on Br O_3~-formation during ozonation process were compared.The addition of H_2O_2effectively inhibited Br O_3~-formation at an initial Br~-concentration amended to 350μg/L.The inhibition efficiencies reached 59.6 and 100%when the mass ratio of H_2O_2/O_3was 0.25and0.5,respectively.The UV_(254)and total organic carbon (TOC) also decreased after adding H_2O_2,while the formation potential of trihalomethanes (THMs FP) increased especially in subsequent chlorination process at a low dose of H_2O_2.To control the formation of both Br O_3~-and THMs,a relatively large dose of O_3and a high ratio of H_2O_2/O_3were generally needed.NH_3addition inhibited Br O_3~-formation when the background ammonia nitrogen(NH_3–N) concentration was low.There was no significant correlation between Br O_3~-inhibition efficiency and NH_3dose,and a small amount of NH_3–N (0.2 mg/L) could obviously inhibit Br O_3~-formation.The oxidation of NOM seemed unaffected by NH_3addition,and the structure of NOM reflected by synchronous fluorescence (SF) scanning remained almost unchanged before and after adding NH_3.Considering the formation of Br O_3~-and THMs,the optimal dose of NH_3was suggested to be 0.5 mg/L.

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