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.
Huan Jing Ke Xue. 2021 Feb 8;42(2):883-890. doi: 10.13227/j.hjkx.202006158.
To improve the removal efficiency of dissolved organic matter in wastewater treatment plant (WWTP) effluent, electro-hybrid 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, electrocoagulation-ozonation, 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.
为提高污水处理厂（WWTP）出水溶解性有机物的去除效率，提出了电混合臭氧氧化-混凝（E-HOC）工艺，并研究了其对污水处理厂出水和布洛芬（IBP）的处理特性及去除机理。E-HOC工艺对污水处理厂出水中的溶解性有机物具有更好的去除效果，分别比电混凝（EC）、臭氧氧化、预臭氧氧化-EC、电凝聚-臭氧氧化和化学混凝的去除率高46.4%、20.0%、19.4%、36.1%和49.7%。为确定E-HOC工艺的机理，进行了猝灭实验和电子顺磁共振（EPR）实验，证实金属混凝剂可作为催化剂有效增加羟基自由基（·OH）的产生。还发现臭氧与混凝剂之间存在协同效应（SOC）。傅里叶变换红外光谱（FT-IR）表明，混凝剂的表面羟基（铝阳极电解产生的水解产物）是SOC反应中产生·OH的活性位点。基于E-HOC系统中有机物去除的动力学分析，SOC效应和臭氧氧化在E-HOC工艺中起主导作用。此外，SOC为·OH的形成创造了一条新途径。
