中文摘要：

研究了不同初始pH值、浊度与常见阴离子浓度等水质条件对UV/H2O2工艺降解邻苯二甲酸二甲酯（DMP）反应速率的影响,并进一步比较了去离子水和自来水中DMP的降解速率。结果表明,UV/H2O2对DMP的光降解过程符合一级反应动力学模型,不同水质条件对降解速率有不同程度的影响。酸性条件较碱性条件更有利于DMP降解;水的浊度大于7NTU时,光降解速率常数迅速下降;NO3^-、Cl^-、HCO3^-等阴离子对DMP降解有抑制作用,且随离子浓度增大,抑制作用增强,3种离子对DMP光降解的抑制程度顺序为HCO3^-〉NO3^-〉Cl^-。在5个30W低压汞灯照射下,当H2O2的浓度为20mg·L^-1时,DMP在去离子水和自来水中光降解速率常数分别为0.0428min^-1和0.0315min^-1,自来水中的光降解速率常数较去离子水中的低,这可能是水中多种离子影响的结果。

英文摘要：

This paper aims to present its author＇s research findings on the influential factors of the water quality on degrading the dimethyl phthalate （DMP） rate, such as its pH value, turbidity and its inorganic anions through UV/H2O2 combination as well as the mechanisms involved. As is known, DMP is a widely accepted environmental hormone which exists everywhere in nature. Our experimental results have shown that UV/H2O2 combining process can be a great help to remove DMP. A 60-minute processing period can be expected to degrade DMP from natural water and tap water at a rate of 84%- 92% . The photo-degrading process would follow the first-order reaction＇s kinetics model. Under the condition of HE02 concentration of 20 mg· L^- 1 with a five 30-W low pressure mercury vapor discharge lamp working on, the first-order photo-degrading rate constant in deioned water and tap water is expected to reach 0. 042 8 min^-1 and 0.031 5 min^ - 1 respectively. Since acid condition is in favor of the photo-degradation for H2O2 can produce more· OH, its photo-degrading rate constant would decrease because · OH is taken by HOE - at the presence of alkaline. Its photo-degrading rate constant would drop slowly with the increase of turbidity on the condition of the turbidity lower than 7 NTU. However, when the turbidity is over 7 NTU, the photo-degrading rate constant would drop quickly because the grains in the solution disperse or react to UV light. As a matter of fact, NO3^- , Cl^- , HCO3^- inhibit DMP photo-degradation, whose inhibit- ing action orders are HCO3^ - 〉 NO3^- 〉 Cl^- , respectively. However, when the anion＇ s concentrations are 0.5 mmol · L^- 1, 5 mmol · L^- 1 and 10 mmol· L^-1. HCO3^- , respectively, the induced photo-de- grading rate of DMP would come down nearly by half, which can be said the strongest inhibitory anion. This is because NO3^- and Cl^- tends to reduce , the production efficiency of · OH and HCO3^- . The higher the anions concentration, the stronger the inhibitory action would be. Therefo