| Title |
Spent-GAC Regeneration Using Variable Frequency Sono-Fenton Oxidation |
| Authors |
주수빈(Joo, Soobin) ; 이상민(Lee, Sangmin) ; 김형준(Kim, Hyungjun) ; 심인태(Shim, Intae) ; 김희진(Kim, Heejin) |
| DOI |
https://doi.org/10.12652/Ksce.2023.43.4.0449 |
| Keywords |
월류수; 펜톤산화; 입상활성탄; 재생; 초음 CSOs; Fenton oxidation; GAC; Regeneration; Ultrasonic |
| Abstract |
As an adsorption technology for dissolved organic matter, the adsorption capacity of granular activated carbon, GAC, can be applied, but activated carbon whose adsorption capacity is significantly reduced by use is inevitably replaced or regenerated. However, due to the economics of replacement cost, thermal regeneration method is used commercially, but high energy cost and loss of activated carbon occur under high temperature conditions above 800℃. In this study, the Sono-Fenton method, a multi-oxidation technology that combines Fenton oxidation and ultrasonic oxidation, was applied to improve the regeneration efficiency of spent GAC used to treat dissolved organic matter in combined sewer overflows (CSOs), and the regeneration efficiency of spent GAC by oxidant and ultrasonic frequency wasinvestigated. In the applied Sono-Fenton treatment, the highest regeneration efficiency of 68.5% was obtained under the regeneration conditions of Fe2+ 10 mmol/L, H2O2 concentration 1,000 mmol/L, ultrasonic treatment time of 120 min, and ultrasonic frequency of 40 kHz. And similar efficiency was also obtained at 750 kHz, while ultrasonic waves of other frequencies had poor regeneration efficiency, and the magnitude of frequency and GAC regeneration efficiency did not show a linear relationship. In the case of continuous operation of the GAC adsorption tower with CSOs prepared by diluting raw sewage, about 700 hours of operation without regeneration was possible, and as a result of applying one Sono-Fenton treatment, 40-70% CODcr removal efficiency was obtained during a total of 1,000 hours of GAC adsorption operation. |