电催化臭氧耦合BAC工艺对污水中卡马西平去除和微生物群落影响

Effect of electrocatalytic ozone coupled with bioactived carbon process on removal of carbamazepine and microbial community in wastewater

以我国南方某市政污水处理厂二沉池出水为研究对象,通过搭建电催化臭氧+生物活性炭(E-H2O2/O3-BAC)为核心工艺的一体化中试系统,评估了系统中高级氧化段和BAC段对癫痫药物卡马西平的降解效果,进一步对不同工艺段出水的细菌群落组成进行了分析。结果表明,单独O3工艺和E-H2O2/O3工艺对卡马西平的去除率分别为95%和90%,经BAC处理后,卡马西平去除率均可达到99%以上。砂滤出水中检测到的条件致病菌属主要包括弓形杆菌属(Arcobacter)、Pseudarcobacter、拟杆菌属(Bacteroides)、嗜肺军团菌(Legionella)和黄杆菌属(Flavobacterium),多种菌属在不同工艺处理后相对丰度发生显著变化(p<0.05)。E-H2O2/O3-BAC处理技术虽然在致病菌杀菌效果上弱于O3-BAC技术,但并未引起致病菌黄杆菌属的显著增加,相较于O3-BAC技术更具有安全性。因此,E-H2O2/O3-BAC深度处理工艺可作为一种有效的技术手段为污水处理厂新污染物的去除和出水微生物安全保障提供支撑,在废水深度处理领域具有良好的应用前景。

This study focused on the effluent from the secondary sedimentation tank of a municipal wastewater treat⁃ment plant in a southern city of China.The degradation effect of the advanced oxidation section and the bioactive carbon section of the system on the epileptic drug carbamazepine was evaluated by constructing an integrated pilot system with electrocatalytic ozonation+bioactivated carbon(E-H2O2/O3-BAC)as the core process.The bacterial com⁃munity compositions of effluent from the different sections of the process were further analyzed.The results showed that the removal efficiencies of carbamazepine by the individual O3 process and the E-H2O2/O3 process were 95%and 90%,respectively.After passing through the BAC stage,the removal efficiency of carbamazepine exceeded 99%for both processes.The predominant potentially pathogenic bacterial genera detected in the sand-filtered efflu⁃ent included Arcobacter,Pseudarcobacter,Bacteroides,Legionella,and Flavobacterium.The relative abundances of these genera exhibited significant changes(p<0.05)after different treatment processes.Although the E-H2O2/O3-BAC process was less effective in disinfecting pathogenic bacteria compared to the O3-BAC process,it did not lead to a significant increase in the relative abundance of Flavobacterium.Therefore,the E-H2O2/O3-BAC advanced treat⁃ment process could serve as an effective technique for the removal of emerging contaminants and microbial safety as⁃surance in wastewater treatment plants.It showed great potential in the field of wastewater advanced treatment.