高能辐射去除饮用水中邻苯二甲酸酯的影响因素

为提高高能辐射去除邻苯二甲酸脂类化合物(PAEs)的能效,研究了辐射去除的主要影响因素:剂量、射线类型、初始浓度、气氛、pH值、共存物质以及PAE类型(邻苯二甲酸二甲酯,DMP;邻苯二甲酸二乙酯,DEP;邻苯二甲酸二丁酯,DBP).以DMP为研究对象,辐照功效(GD)随PAEs初始浓度增加而增加,但随吸收剂量的增加而下降;辐照存在剂量率效应,在同等剂量下,g 辐照比EB辐照能量利用率更高.不同气氛条件下辐照降解效率顺序为:充O2>饱和空气>充N2;在本试验浓度下,辐射降解的最适初始 pH值是5~10,较低或较高pH值都会降低去除效率;水中阴离子抑制剂存在会降低去除效果.不同类型PAEs辐照去除效率大小依次为DMP,DEP,DBP.

Influencing factors for PAEs removal by high energy radiation in drinking water

To achieve higher energy efficiency of radiation, the main factors affecting phthalic acid esters (PAEs) removal were studied in this paper. The experimental results showed that the removal efficiency of irradiation (GD )were positively correlated with DMP initial concentration , but decreased with the increase of dose; the energy utilization rate of gamma irradiation was higher compared to that of EB irradiation; the efficiency of DMP irradiation degradation in different atmosphere followed a decreasing order: O2>saturated air> N2. Solution pH presented an important influence in DMP removals during irradiation, the highest DMP degradation reaction constants was achieved at pH value of 5~10. It is observed that the anionic radical scavengers in water had an adverse influence on DMP irradiation degradation. In addition, the irradiation removal efficiencies of different types of PAEs were carried out, which fitted a following order: DMP>DEP> DBP;In short, it is feasible for PAEs removal by high energy radiation in water.