基于硫酸根自由基技术对饮用水源水中藻类和有机污染物的协同去除

Algal blooms and organic pollutants have caused serious water-environmental problems and posed many challenges to drinking water production in China, thus the removal of algae and organic pollutants in drinking water sources is very necessary. Recently, sulfate radical-based advanced oxidation process has been developed as a promising technology for removal of refractory organic pollutants with high oxidation potential and inactivation of organisms. Due to the promotion for generation and reaction of sulfate radical by algae organic matter, sulfate radical-based advanced oxidaton process is theoretically expected to synergistically remove algae and organic pollutants in drinking water sources. Some typical algae and organic pollutants in contaminated water will be selected as targets to evaluate the application of UV/Persulfate and US/Persulfate in removal of the two pollutants in this project. This study aims to evaluate the individual and synergetic removal effect of the two pollutants, investigate the mechanisms , and disclose the persistent removal ability. In addition, combination of sulfate radical-based pretreatment process and conventional water treatment processes (coagulation-sedimentation-filtering) for dynamic water treatment will be conducted in this project. The treatment efficiency and optimization of reaction conditions will be determined for obtaining the best process parameters and applicable conditions.This project aims to provide a novel technology for the purification of drinking water source, and to explore the engineering application of sulfate radical-based process.

当前我国自来水厂广泛面临藻类和有机物污染的严重威胁，对饮用水源水中藻类和有机污染物的去除十分必要。基于硫酸根自由基的高级氧化技术是近年来发展起来的难降解有机污染物去除新技术，硫酸根自由基氧化还原电位高还具有生物灭活能力。藻类有机物可促进硫酸根自由基产生和作用，因此基于硫酸根自由基技术理论上可实现对藻类和有机污染物的协同去除。本项目拟选取典型藻类和有机污染物作为处理对象，分别采用紫外/过硫酸盐体系和超声/过硫酸盐体系进行处理，研究基于硫酸根自由基技术对上述污染物的单独和协同去除效果，揭示协同机制，探究硫酸根自由基持续性作用过程与机理。在此基础上将基于硫酸根自由基预处理技术与常规水处理工艺联合对实际水源水进行动态试验研究，考察处理效果，优化反应条件，最终确定工艺参数并得出适用条件。本项目为饮用水源水净化方法提供新的思路和依据，为基于硫酸根自由基技术的工程应用提供一定的应用基础。

当前我国自来水厂广泛面临藻类和有机物污染的严重威胁，而常规工艺难以有效去除，严重危害人体健康，因此，研发新型高效去除饮用水源水中藻类和有机污染物的工艺技术十分必要。本项目研究了基于硫酸根自由基的高级氧化技术用于水中藻和有机物的降解效果及机理，同时通过中试实验考察了该技术对实际水的处理效果。研究结果表明：在紫外/过硫酸盐体系下，藻和有机污染物均能够得到高效去除，其中光强、pH、过硫酸盐投加量对去除效果有重要影响，硫酸根自由基和羟基自由基在该体系起主要作用。紫外/过硫酸盐氧化能够在较低的过硫酸盐投加量下实现强化混凝，提高常规水的处理效果，同时能够减少部分氯化消毒副产物的生成。在藻和有机污染物同时存在的条件下，该体系仍然能够高效去除藻和有机污染物。实际水动态实验表明该体系在实际应用上也表现出良好的处理效果，具有一定的实用性。