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目的研究臭氧消毒饮水过程中溴酸盐的生成规律及控制措施。方法采用碘量法和离子色谱法,对水中臭氧浓度及其生成的溴酸盐等副产物浓度进行了检测。结果在水中臭氧投加量为17.67 mg/L条件下,随着溴离子浓度增加所形成的溴酸盐浓度随之增加。本反应体系中溴离子浓度在0.5 mg/L时,溴酸盐浓度达到0.014mg/L。降低臭氧浓度、水温、色度以及酸性条件均对溴酸盐的生成有一定的抑制作用,实验体系水中加入0.025mg/L铵离子能够抑制溴酸盐的生成,低于本方法的检出限。结论臭氧消毒水体水中溴离子浓度是影响溴酸盐浓度的主要因素,添加铵盐可以控制溴酸盐的生成。
Objective To study the formation and control of bromate in ozone disinfection drinking water. Methods Iodometric and ion chromatography methods were used to determine the concentration of ozone in water and by-products such as bromate. Results Under the condition of 17.67 mg / L of ozone in water, bromate concentration increased with the increase of bromide ion concentration. The bromate concentration reached 0.014 mg / L when the bromide ion concentration was 0.5 mg / L in this reaction system. Decreasing the concentration of ozone, water temperature, chroma and acidic conditions all have a certain inhibitory effect on the formation of bromate. Adding 0.025mg / L ammonium ion to the water in the experimental system can inhibit the bromate formation below the detection limit of this method . Conclusion The concentration of bromide ion in water of ozone disinfection is the main factor affecting the bromate concentration. Adding ammonium salt can control the bromate generation.