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针对含溴离子(Br-)的长江原水,通过臭氧化小试实验研究氨氮、pH、O3投加量和水温对副产物溴酸根(BrO-3)的生成影响.结果表明,实验条件下(pH 7.35、氨氮背景浓度0.6 mg/L),投加氨氮对原水中BrO-3形成的抑制作用有限,初步分析氨氮无法屏蔽BrO3-的间接-直接生成途径.O3投加量在0.8~2.5 mg/L的试验范围内,为保证BrO-3不超标,初始溶解O3须在1.2mg/L以下.BrO3-的形成对pH变化很敏感,pH调低到6.3,30 min生成量降低至8μg/L.降低温度,O3稳定性升高,BrO-3浓度亦显著降低,10℃时100μg/L Br-在初始1.6 mg/L溶解O3浓度条件下,BrO-3生成量为9.1μg/L.
The effects of ammonia nitrogen, pH, O3 dosage and water temperature on the formation of bromate (BrO-3) by-product were investigated in the Yangtze River raw water containing bromine ions (Br-). The results showed that under the experimental conditions pH 7.35 and background concentration of ammonia nitrogen 0.6 mg / L). The addition of ammonia nitrogen limited the formation of BrO-3 in raw water. The direct and indirect route of BrO3- / L within the experimental range, in order to ensure that BrO-3 does not exceed the standard, the initial dissolved O3 must be 1.2mg / L. The formation of BrO3- sensitive to pH changes, pH down to 6.3,30 min generation reduced to 8μg / L reduced the temperature, the stability of O3 increased, and the concentration of BrO-3 also decreased significantly. At 10 ℃, the amount of BrO-3 produced was 91μg / L at the initial concentration of 1.6 mg / L dissolved O3.