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为了研究水中存在Br-的情况下,Fe3+和Cu2+对三卤甲烷(THMs)的生成及CHCl3、CHBr Cl2、CHBr2Cl、CHBr34种消毒副产物相对分布的影响,以腐殖酸模拟氯消毒过程中的前体物进行实验。结果表明,在p H为6、7和9 3种条件下,Fe3+抑制了THMs的生成,p H=6时只有CHCl3生成量随着Fe3+浓度的增加逐渐减少,其余3种消毒副产物均在增加,p H=7时4种消毒副产物浓度均减小并在Fe3+浓度为2 mg/L时生成量最低,p H=9时的生成趋势与p H=6时类似。Cu2+能促进THMs的生成,在p H为6、7和9时,当加入0.5 mg/L Cu2+时,THMs总量分别增加了16.7%、22.6%和2.5%,随着p H增加,THMs总量增加。在3种p H环境中,Cu2+对THMs生成的影响大于Fe3+,在偏酸性环境中,Fe3+影响THMs生成,产生的致癌风险高,当金属离子浓度为2.5 mg/L时,致癌风险相差最高为15%,在中性和偏碱性环境中,Cu2+影响THMs生成,产生的致癌风险高。
In order to study the effect of Fe3 + and Cu2 + on the formation of THMs and the relative distribution of 34 kinds of disinfection byproducts of CHCl3, CHBr Cl2, CHBr2Cl and CHBr in the presence of Br- in water, Precursor experiments. The results showed that Fe3 + inhibited the formation of THMs under the conditions of 6, 7 and 9 p H, and only the production of CHCl3 gradually decreased with the increase of Fe3 + concentration at p H = 6. The other three disinfection by-products The concentration of four kinds of disinfection byproducts decreased when p H = 7 and the lowest when the concentration of Fe 3 + was 2 mg / L. The generation tendency at p H = 9 was similar to that at p H = 6. The total amount of THMs increased by 16.7%, 22.6% and 2.5%, respectively, when 0.5 mg / L Cu2 + was added at p H of 6, 7 and 9 with Cu2 + Increase in volume. In three kinds of p H environment, the effect of Cu2 + on THMs is greater than that of Fe3 +. In acidic environment, Fe3 + affects the generation of THMs, resulting in high carcinogenic risk. When the metal ion concentration is 2.5 mg / L, the highest carcinogenic risk is 15%, Cu2 + affects the formation of THMs in neutral and alkaline environments, resulting in high carcinogenic risk.