石化废水典型含氮有机物的VUV-高级氧化/还原降解机制及工艺优化

石化废水中的含氮有机物（NOCs）检出浓度高、生物降解性差，已成为行业水处理的关注重点。高级氧化技术是有效的NOCs降解去除手段，然而产物中存在的大量氨氮或硝酸盐可能严重干扰后端的生物处理及脱氮过程，开展石化废水NOCs的降解、脱氮协同技术及原理研究很有必要。真空紫外（VUV）体系同时产生氧化性和还原性活性基团的特点为上述问题的解决提供了可能。本项目以4种典型NOCs为对象，分别研究其高级氧化及高级还原降解行为，解析不同结构NOCs与活性基团（如•OH、eaq-）间的反应途径及氮素转化规律；构建氧化剂/还原剂强化VUV-高级氧化/还原体系，研究NOCs的降解、脱氮协同机理；利用CFD模拟VUV体系内活性基团的分布、衰减特征及NOCs的降解过程，提出反应器优化设计构型并评估处理实际NOCs废水的能源利用效率。本项目的实施将为石化废水NOCs的高效去除提供理论依据，同时为其工艺选择提供新思路。

Nitrogen-containing organic compounds (NOCs) attract great attentions in petrochemical wastewater treatment due to their high concentration and poor biodegradability. Advanced oxidation processes (AOPs) have been used as effective methods for NOCs degradation and removal. However, the nitrogen-containing degradation products, which mostly exist as ammonia or nitrate, may seriously impact the subsequent biological units and denitrification process. Therefore, it is necessary to study the synergistic technology and principle on the NOCs degradation and denitrification in petrochemical wastewater. Vacuum ultraviolet (VUV) process could produce reactive oxidizing and reducing species simultaneously by irradiating water, which provides the possibility to solve the problems above. Four typical NOCs in petrochemical wastewater are selected to study the advanced oxidation and advanced reduction degradation behaviors, respectively. The reaction pathways between different NOCs and reactive species (such as •OH、eaq-) and the nitrogen transformation will be analyzed. Then the synergistic mechanisms of NOCs degradation and denitrification will be also studied by constructing oxidants/reductants enhanced VUV-AO/RPs. Finally, the computational fluid dynamics (CFD) model will be used to simulate the distribution and attenuation of reactive species as well as the degradation of NOCs under VUV process. Afterwards, efficient reactors will be proposed with optimized configuration to evaluate the energy utilization efficiency for practical NOCs wastewater treatment. This project aims to provide a theoretical basis for the efficient removal of NOCs in petrochemical wastewater and a new selection for the actual wastewater treatment process.