Research
| Title： | Improving advanced oxidation process efficiency in secondary swine wastewater effluent treatment by concentrating oxygen-depleted organic matter through nanofiltration membranes |
|---|---|
| First author： | He, Hang; Yang, Qiyuan; Yang, Peng; Zhang, Jianbo; Zhou, Hao; Ai, Jing; Li, Lanfeng; Wang, Dongsheng; Zhang, Weijun |
| Journal： | JOURNAL OF HAZARDOUS MATERIALS |
| Years： | 2025 |
| DOI： | 10.1016/j.jhazmat.2025.139908 |
| Abstract： | The combination of nanofiltration with advanced oxidation processes (AOPs) presents a synergistic strategy for cost-efficient wastewater treatment, yet the mechanistic effect of dissolved organic matter (DOM) enrichment in nanofiltration concentrate on AOP efficacy remains unclear. In this study, we utilized high-resolution mass spectrometry for molecular-level characterization to systematically explore how nanofiltration membrane concentration (NMC) affects the degradation of DOM from secondary swine wastewater effluent during UV/Fenton treatment. Our findings revealed that nanofiltration membranes selectively concentrated DOM molecules with a correlated with acute toxicity. As a result, for concentrates with volumetric reduction factors (VRF) of 4 and 8, UV/Fenton treatment achieved DOC removal efficiencies 6.4 % and 8.4 % higher than that of secondary effluent, respectively, accompanied by a obviously reduction in acute toxicity. Additionally, the UV/Fenton process improved the biodegradability of concentrates by converting the unsaturated DOM into the biolabile aliphatic compounds (H/C > 1.5) via potential reactions, such as hydration and hydroxylation, thereby increasing DOC removal during aerobic biodegradation. The study delivers mechanistic evidence supporting NMC-enhanced AOPs performance and post-oxidation biodegradability improvement, providing a molecular framework for optimizing the hybrid treatment process. |
