Hydroxyl radical intensified Cu₂O NPs/H₂O₂ process in ceramic membrane reactor for degradation on DMAc wastewater from polymeric membrane manufacturer

Abstract

• Cu₂O NPs/H₂O₂ Fenton process was intensified by membrane dispersion.

• DMAc removal was enhanced to 98% for initial DMAc of 14000 mg/L.

• Analyzed time-resolved degradation pathway of DMAc under ·OH attack.

High-concentration industrial wastewater containing N,N-dimethylacetamide (DMAc) from polymeric membrane manufacturer was degraded in Cu₂O NPs/H₂O₂ Fenton process. In the membrane-assisted Fenton process DMAc removal rate was up to 98% with 120 min which was increased by 23% over the batch reactor. It was found that ·OH quench time was extended by 20 min and the maximum ·OH productivity was notably 88.7% higher at 40 min. The degradation reaction rate constant was enhanced by 2.2 times with membrane dispersion (k = 0.0349 min⁻¹). DMAc initial concentration (C₀) and H₂O₂ flux (J_p) had major influence on mass transfer and kinetics, meanwhile, membrane pore size (r_p) and length (L_m) also affected the reaction rate. The intensified radical yield, fast mass transfer and nanoparticles high activity all contributed to improve pollutant degradation efficiency. Time-resolved DMAc degradation pathway was analyzed as hydroxylation, demethylation and oxidation leading to the final products of CO₂, H₂O and NO₃⁻ (rather than NH₃ from biodegradation). Continuous process was operated in the dual-membrane configuration with in situ reaction and separation. After five cycling tests, DMAc removal was all above 95% for the initial [DMAc]₀ = 14,000 mg/L in wastewater and stability of the catalyst and the membrane maintained well.

Graphical abstract

Keywords

Ceramic membrane reactor / N, N-dimethylacetamide / Fenton process / Cu ₂O / Wastewater treatment

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