期刊
CHEMOSPHERE
卷 308, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.136377
关键词
Ferrate (Fe(VI)); Sodium percarbonate (SPC); Ultrafiltration (UF); Algal-rich water; Membrane fouling alleviation
资金
- Shandong Provincial Major Scientific and Technological Innovation Project (MSTIP) [2020CXGC011203]
- National Natural Science Foundation of China [51908334]
- Shandong Postdoctoral Innovation Project [201902031]
- Youth Innovation Technology Project of Higher School in Shandong Province [2019KJD003]
- Introduction and Cultivation Plan for Young Innovative Talents of Colleges and Universities by the Education Department of Shandong Province
A novel strategy coupling ferrate and sodium percarbonate was proposed to improve ultrafiltration (UF) performance and alleviate membrane fouling resulted by algal foulants. The coupling process activated ferrate to generate high-valent intermediates, which played a crucial role in high-efficiency oxidation for algal foulants. The collaborative effect of ferrate and sodium percarbonate increased the terminal specific flux and reduced fouling resistances.
Ultrafiltration (UF) is a reliable method to treat algal-rich water, whereas severe membrane fouling has impeded its actual application. To improve UF performance and alleviate membrane fouling resulted by algal foulants, a novel strategy coupling ferrate (Fe(VI)) and sodium percarbonate (SPC) was proposed. During the coupling process, Fe(VI) was activated by SPC to generate high-valent Fe intermediates (Fe(V) and Fe(IV)), which played a crucial role in high-efficiency oxidation for algal foulants, and the in-situ formed Fe(III) particles decomposed by Fe(VI) also enhanced the coagulation and adsorption capacity to the coupling system. Under the triple effects of coagulation, adsorption and oxidation, the algal foulants were efficiently eliminated. The zeta potential increased from -32.70 mV to -6.56 mV at most, the particle size was significantly enlarged, and the generated flocs possessed a great settleability. The morphology, viability, and integrity of algae cells were effectively maintained. The dissolved organic matters and fluorescent organics were efficiently removed, as well as macromolecular organics were reduced into lower molecular weight components. With the collaborative effect of Fe(VI) and SPC, the terminal specific flux was increased from 0.29 to 0.92, and the reversible and irreversible fouling resistances were reduced by 98.5% and 69.4%, individually. The surface functional groups were changed, and the dominant mechanisms were also converted to pore blocking from cake layer filtration. Overall, the experimental results would provide some new thoughts in actual production for algal-rich water treatment and UF membrane fouling alleviation.
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