Abstract
Dye wastewater is a type of high-concentration, high chromaticity, and high salinity organic wastewater, which is generally treated with activated carbon adsorbent. The effective regeneration of granular activated carbon (GAC) is the key to reducing the operating cost of GAC in the wastewater treatment process. The regeneration characteristics of saturated GAC adsorbed on 288 orange dye wastewater were studied by using the ultrasonic coupled thermal regeneration method. The results showed that the regeneration efficiency of GAC adsorbed on 288 orange dye wastewater increased with the increase of ultrasound power. The optimal ultrasound frequency and regeneration temperature were determined to be 45 kHz and 60 ℃, and the relationship between regeneration times and carbon loss rate was explored. The combination of ultrasound and high-temperature heating methods has successfully improved the regeneration efficiency of GAC and significantly reduced the high-temperature thermal regeneration time of GAC, thereby reducing the mass loss rate of GAC. The performance changes of fresh activated carbon (FAC), saturated activated carbon (SAC), ultrasonic regeneration of activated carbon (UAC), and thermal regeneration of activated carbon (TAC) during the combined regeneration process were explored by characterizing the regenerated GAC. Infrared characterization showed that the C–O group of GAC was significantly weakened after coupling treatment, indicating that ultrasonic treatment can significantly enhance the desorption effect of thermal regeneration. The microjet, shock wave, and cavitation effects generated by ultrasonic treatment restore the specific surface area of GAC, mainly increasing the micropore volume and pore size of GAC, and enhancing the treatment effect of thermal regeneration.
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This work was supported by Ministry of Industry and Information Technology of the People’s Republic of China (grant numbers [Z135060009002-4–12]).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Kaizheng Shi, Yong Wang, and Bo Chen. The first draft of the manuscript was written by Kaizheng Shi. Zhang Xu and Weisong Fu verified and modified the article, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Shi, K., Xu, Z., Wang, Y. et al. Study on regeneration characteristics of granular activated carbon using ultrasonic and thermal methods. Environ Sci Pollut Res 31, 26580–26591 (2024). https://doi.org/10.1007/s11356-024-32734-y
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DOI: https://doi.org/10.1007/s11356-024-32734-y