UV/PS去除饮用水中亚硝基二丙胺的研究

The removal of nitrosodipropylamine in drinking water by UV/PS

采用紫外/过硫酸盐(UV/PS)高级氧化技术去除饮用水中含氮消毒副产物亚硝基二丙胺(NDPA),考察了PS投加量、NDPA初始浓度、pH值、共存阴离子对NDPA降解效率的影响,并拟合其动力学模型。结果表明,单独UV辐射以及单独PS氧化,去除效果均不显著;UV/PS联用有较高的降解效果,在反应温度为25℃、pH值为7.0、紫外光照强度为168μW/cm^(2)下,最佳PS投加量和NDPA初始浓度分别为0.05 mmol/L和200μg/L时,UV/PS可在40 min内降解75%以上的NDPA。NDPA的降解速率随着PS投加量的增大而增大,随着NDPA初始浓度的增加而降低;随着pH值的增大而减小;共存阴离子NO^(-)_(3)对NDPA的去除具有轻微的抑制作用,而HCO^(-)_(3)、Cl^(-)对NDPA的去除具有一定的促进作用。其降解均符合一级动力学。

Ultraviolet/persulfate(UV/PS)advanced oxidation technology(AOPs)was used to remove nitrogen-containing disinfection by-products(N-DBPs)and nitrosodipro pylamine(NDPA)in drinking water,and the PS dosage and NDPA were investigated.The effect of the optimal PS dosage,initial concentration of NDPA,pH,and coexisting anions on the degradation efficiency of NDPA,and fitting its kinetic model.The results show that:UV radiation alone and PS oxidation alone,the removal effect is not significant;UV/PS combined use has a higher degradation effect.When the reaction temperature is 25℃,the pH value is 7.0,and the ultraviolet light intensity is 168μW/cm^(2),when the optimal PS dosage and the initial concentration of NDPA are 0.05 mmol/L and 200μg/L,respectively,the UV/PS can be within 40 min degrade more than 75%of NDPA.The degradation rate of NDPA increases with the increase of the PS dosage,and decreases with the increase of the initial concentration of NDPA;it decreases with the increase of pH;the coexisting anion NO^(-)_(3) has a slight inhibition on the removal of NDPA HCO^(-)_(3) and Cl^(-) can promote the removal of NDPA.The degradation is in accordance with first-order kinetics.