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以腐殖酸模拟天然水体中氯化消毒副产物的前驱物进行实验,研究了水中存在Br-、不同pH条件下,Ca~(2+)、Mg~(2+)单独存在和2种离子共存时对三卤甲烷(THMs)的生成量和4种THMs(CHCl_3、CHBrCl_2、CHBr_2Cl、CHBr_3)相对分布的影响。结果表明,在pH为6.0、7.0、9.0 3种条件下,Ca~(2+)、Mg~(2+)对THMs的生成均起到一定的抑制作用,并且Mg~(2+)比Ca~(2+)对THMs生成的抑制作用更强。此外,随着pH的升高THMs生成总量增加,说明碱性环境更有利于THMs的生成。偏酸性环境下,Ca~(2+)的存在有利于溴代三卤甲烷的生成,Mg~(2+)有利于氯代三卤甲烷的生成。Ca~(2+)、Mg~(2+)浓度超过1.0 mg/L后,对THMs生成有较明显抑制作用。中性环境下,Ca~(2+)单一存在时,随着Ca~(2+)浓度的增加THMs的生成总量先增后减,并且在Ca~(2+)浓度为2.5 mg/L时达到最大值,此时Ca~(2+)有利于氯代三卤甲烷的生成;Ca~(2+)、Mg~(2+)同时存在时,THMs的生成分布改变,溴代三卤甲烷的生成显著增多。
The humic acid was used to simulate the precursor of chlorinated disinfection by-products in natural water. The effects of different concentrations of Ca 2+, Mg 2+ and two kinds of ions (THMs) and the relative distribution of four THMs (CHCl_3, CHBrCl_2, CHBr_2Cl, CHBr_3) in the presence of co-existence. The results showed that Ca 2+ and Mg 2+ inhibited the formation of THMs under the conditions of pH 6.0, 7.0 and 9.0, and the ratio of Mg 2+ to Ca 2+ ~ (2+) has a stronger inhibitory effect on THMs production. In addition, with the increase of pH, the total amount of THMs produced increased, indicating that the alkaline environment is more conducive to the formation of THMs. Under acidic environment, the presence of Ca 2+ is favorable for the formation of brominated trihalomethanes, and Mg 2+ is favorable for the formation of chlorotrihalomethanes. After the concentration of Ca 2+ and Mg 2+ exceeded 1.0 mg / L, the inhibition of THMs production was obvious. In the neutral environment, the total amount of THMs increased first and then decreased with the increase of Ca 2+ concentration in the presence of Ca 2+, and at a Ca 2+ concentration of 2.5 mg / L (2 +) and Mg ~ (2+), the formation distribution of THMs changed, the content of brominated trihalide Methane generation is significantly increased.