Abstract
In this study, ultrasonic-backwashing regeneration at different frequencies as well as adsorption experiments were carried out on eight-year-old activated carbon from the filter tank of a water purification plant. The number of pores with transitional sizes between those of micropores (< 2 nm) and mesopores (2–50 nm) was higher after regeneration, and an enlargement of micropores into mesopores was observed. The average particle size of the regenerated carbon decreased by 2.35 %–4.00 %, and there was no significant fragmentation. In XPS characterization, the peak intensities of C, O, and N functional groups were decreased after regeneration, so ultrasonic regeneration disrupted the covalent bonds formed between carbon atoms and other elements. The microbial community diversity of the regenerated carbon was analyzed and compared with that of the original carbon, showing them to be largely the same. Organic-matter-related water-quality indexes and activated carbon adsorption performance indexes upon regeneration were studied and found to be well correlated. After multiple ultrasonic regeneration, the strength is still not <90 %.
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