不同水质特性对2, 4-D臭氧化过程的影响

为考察实际水处理中复杂水质条件对臭氧化的影响，提出了一种用实验室模拟水质的研究方法.在去离子水配制的溶液里加入少量无机盐、小分子有机的，以及用自来水、地表水配制2, 4-二氯苯氧乙酸（2，4-D）溶液，检测反应过程中的2, 4-D、氯离子、过氧化氢浓度，讨论水质特性对臭氧化反应动力学的影响.结果表明，自来水、地表水、硝酸钠等能提高2, 4-D臭氧氧化速率，增强2, 4-D的脱氯效果；氯化钠等具有抑制作用，降低脱氯能力；硫酸钠对反应速率基本无影响.2, 4-D臭氧化可产生过氧化氢，水质可改变溶液中过氧化氢浓度，影响过氧化氢生成速率.

Effect of different water quality on ozonation of 2, 4-D

For investigating the effect of complex water quality on ozonation process in water treatment,an analysis method with simulated water quality in a laboratory scale reactor was presented.After different inorganic salts and small molecule organics were added to 2,4-dichlorophenoxyacetic acid(2,4-D) solution prepared with deionized water,tap water and surface water were used to prepare 2,4-D solution without other additives,and organics,chloride ion and hydrogen peroxide concentration were analyzed during the reaction process to learn the impact of water quality on kinetics of ozonation.Experimental results show that tap water,surface water and some compounds such as sodium phosphate promote ozonation kinetics rate constant and enhance the dechlorination rate of 2,4-D.Some compounds such as Sodium chloride inhibit reaction and weaken the dechlorination rate.Sodium sulfate makes no difference to the degradation of 2,4-D.Hydrogen peroxide is produced during the ozonation of 2,4-D.The hydrogen peroxide formation rate is influenced by the water quality.