摘要
以污水厂二级出水溶解性有机物强效去除为目的,本研究构建了电凝聚臭氧化耦合(E-HOC)体系,明确了该体系对污水厂二级出水及布洛芬的处理特性,探明了有机物的强化去除机制.结果表明,在pH5条件下,E-HOC工艺对二级出水溶解性有机物的去除效果更优,相较于臭氧氧化、电絮凝工艺、预臭氧化-电絮凝工艺、电絮凝串联臭氧工艺以及化学混凝工艺分别提高了46.4%、20.0%、19.4%、36.1%和49.7%.为进一步明确该耦合工艺去除溶解性有机物的机制,基于淬灭实验和EPR特征峰谱图分析,证实了金属盐混凝剂可作为催化剂有效地提高羟基自由基(·OH)的产量,揭示了该耦合体系存在臭氧混凝协同增效(SOC)反应.傅立叶红外的分析结果表明,Al阳极电解产生的混凝剂水解物表面羟基为SOC反应中产生·OH的活性位点.基于有机物在E-HOC体系中的动力学特性,解析了耦合体系中有机物的去除机制,SOC反应和臭氧氧化反应在E-HOC体系的有机物去除过程中作用显著,SOC反应为·OH的生成提供了一种新的途径.
To improve the removal efficiency of dissolved organic matter in wastewater treatment plant(WWTP)effluent,electrohybrid ozonation-coagulation(E-HOC)is proposed and the treatment characteristics and removal mechanism for WWTP effluent and ibuprofen(IBP)are investigated.The E-HOC process has a better removal effect on dissolved organic matter in WWTP effluent,achieving 46.4%,20.0%,19.4%,36.1%,and 49.7%higher removal than EC,ozonation,pre-ozonation-EC,electrocoagulationozonation,and chemical coagulation,respectively.To determine the mechanism of the E-HOC process,quenching experiments and electron paramagnetic resonance(EPR)were conducted,which confirmed that metal coagulants can be used as a catalyst to effectively increase the generation of the hydroxyl radical(·OH).Synergistic effects between ozone and the coagulants(SOC)were also found to be involved.Fourier-transform infrared spectroscopy(FT-IR)illustrated that the surface hydroxyl groups of the coagulant(hydrolyzed species produced by Al anode electrolysis)were the active sites for the generation of·OH in the SOC reaction.Based on a kinetics analysis of organic matter removal in the E-HOC system,SOC effects and ozonation played dominant roles in the E-HOC process.Additionally,the SOC created a new pathway for·OH formation.
作者
谢新月
许建军
张少华
刘雨果
金鑫
金鹏康
XIE Xin-yue;XU Jian-jun;ZHANG Shao-hua;LIU Yu-guo;JIN Xin;JIN Peng-kang(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;China Machinery International Engineering Design&Research Institute Co.,Ltd.(CMIE)East China Branch,Nanjing 210046,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2021年第2期883-890,共8页
Environmental Science
基金
国家自然科学基金青年科学基金项目(51708443)
国家重点研发计划项目(2016YFC0400701)
陕西省教育厅重点项目(18JS057)
陕西高校新型智库项目。
关键词
电凝聚臭氧化耦合(E-HOC)
协同作用
电絮凝
表面羟基
臭氧化
electro-hybrid ozonation-coagulation(E-HOC)
synergistic effects
electrocoagulation
surface hydroxyl groups
ozonation
