| Autor: |
Wang, Saier, Wang, Hanbang, Xiang, Huiming, Shi, Ying, Su, Lianghu, Zhou, Tao, Zhang, Longjiang |
| Zdroj: |
Journal of Environmental Chemical Engineering; December 2022, Vol. 10 Issue: 6 |
| Abstrakt: |
This study investigates the use of UV365irradiation to activate sodium persulfate (PS, 1–8%) for rapid hydrolyzation and humification of food waste (FW) slurry. Physicochemical characterizations show that the hydrolysis yield reaches a maximum value (745.06 g SCOD/kg TVSadded) following UV365/4% PS application for 120 hr. Fluorescence excitation–emission matrix spectroscopy combined with parallel factor analysis indicates that FW fluorescent molecules decompose into humus-like and tryptophan-like substances, with high PS dosages (4–8%) promoting the formation of the former, as confirmed by scanning electron microscopy, gel permeation chromatography, and Fourier transform infrared spectroscopy. Our proposed mechanism involves nonselective attack by SO4•−on various FW components, leading to rapid (<12 hr) hydrolysis of the FW macromolecules to soluble small molecules (e.g., glucose, amino acids). The SO4•−radicals are then gradually consumed, and the weakly oxidizing environment catalyzes the recombination of the hydrolyzed small molecules to form humus-like substances. Our proposed method could provide valuable new insights for FW management. |
| Databáze: |
Supplemental Index |
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