Rapid Degradation of Chlortetracycline Using Hydrodynamic Cavitation with Hydrogen Peroxide

Abstract

Chlortetracycline (CTC), which has been frequently detected in surface water, is generated primarily by the discharge of high-concentration CTC wastewater from pharmaceutical and livestock plants. The development of effective CTC degradation technology is critical. In this study, the extent of CTC degradation at 80 mg/L was investigated by combining hydrodynamic cavitation (HC) and hydrogen peroxide (H2O2). The results indicate degradation ratios of 88.7% and 93.8% at 5 and 30 min, respectively. Furthermore, the possible mechanisms of CTC degradation were determined via HPLC-MS. The CTC degradation pathways include ring openings, C–N bond cleavage, demethylation, dehydroxylation, and desaturation in the sole system of HC, and a series of additional reactions, such as glycine conjugation and the cleavage of C–C double bonds, occurs in the binary system of HC + H2O2. Nevertheless, the treated water poses ecological risks and cannot be directly discharged into the environment. Therefore, HC + H2O2 treatment may be a rapid and effective primary method for the degradation of high-concentration CTC in pharmaceutical factories.

Hydrodynamic cavitation-enhanced photocatalytic activity of P-doped TiO2 for degradation of ciprofloxacin: Synergetic effect and mechanism

“…Fig. 13 illustrates the potential mechanism of HC-assisted photocatalytic CIP decomposition in the presence of P-TiO 2 which can be summarized in two typical ways, hydrodynamic cavitation oxidation and catalytic oxidation [49] , [52] .

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Degradation of Rhodamine dye using a fluctuating flow type photocatalytic reactor byexternal oxidants

“…The observed increase in dye degradation rate with the addition of hydrogen peroxide up to an optimum limit can be explained by the enhanced generation of hydroxyl radicals (Glaze et al 1987;Chand et al 2009;Meng et al 2022), which the dye molecules can readily use. Beyond the optimal loading of 8 mg/L, the dye degradation decreases due to the excess hydrogen peroxide's ability to scavenge hydroxyl radicals.…”

Investigations on cavitation flow and vorticity transport in a jet pump cavitation reactor with variable area ratios

“…Xu et al [26] conducted a HC disinfection test with a JPCR for a cell suspension containing Microcystis aeruginosa; the results showed that JPCR could effectively inhibit photosynthetic activity of algal cells, and the cell disruption efficiency of JPCR was improved in the limited cavitation stage. Meng et al [27] investigated the extent of chlortetracycline (CTC) degradation using a combination of the venturi tube hydraulic cavitation device and the oxidizing agent hydrogen peroxide (H 2 O 2 ). Their results demonstrated that this combined approach effectively degraded CTC, with degradation rates reaching 93.8 %.…”