Abstract
In this study, zero-valent iron (ZVI) is utilized as the source of Fe2+ in the electro-Fenton (EF) reaction and as an activator for peroxomonosulfate (PMS) to construct the EF/ZVI/PMS system, which is combined with coagulation technology to enhance the degradation efficiency of organic pollutants, COD, and TOC, thereby reducing the overall reaction time. In the laboratory experiments, tetracycline hydrochloride (TC-HCl) serves as a model for simulated wastewater. The optimization of voltage, ZVI dosage, PMS dosage, electrochemical reaction time, coagulant dosage, and pH levels in the system are optimized through one-way and orthogonal experiments. Employing X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), scanning electron microscopy (SEM), zeta potential measurements, Fourier transform infrared spectroscopy (FTIR), and liquid chromatography-mass spectrometry (LC-MS), the synergistic mechanism and degradation pathway of oxidation, coagulation, and adsorption in the combined treatment of ZVI/EF/PMS system and coagulation technology are analyzed. The results show that after EF/ZVI/PMS oxidation treatment, the coagulation performance of wastewater is enhanced, and the subsequent addition of coagulation agents further improves the degradation effect of pollutants through compression of the electric double layer and adsorption and electroneutralization. In addition, the wide applicability of the system to pollutants of different concentrations and types has been verified. The coupling of EF/ZVI/PMS system and coagulation technology overcomes the limitations of low mineralization rates and long treatment times associated with electrochemical oxidation, as well as the inadequate treatment effects of coagulation alone, and provides offering a novel approach for the development of cost-effective and green multi-technology coupling.
Published Version
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