| Title |
Radiation Treatment of Terephthalic Acid and Ethylene Glycol by using Gamma-rays |
| Authors |
이선미 ( Sun Mi Lee ) ; 조훈제 ( Hun Je Jo ) ; 김정규 ( Jeong Gyu Kim ) ; 정진호 ( Jin Ho Jung ) |
| Keywords |
Gamma-rays; Terephthalic acid; Ethylene glycol; Biodegradability; Weight-loss wastewater |
| Abstract |
Gamma-rays effectively decomposed TPA and EG, thus removal of 1.0×10^(-3)M pollutants was near 65 and 95%, respectively, at an absorbed dose of 10 kGy. However, TOC removal in the radiation treatment was less than 5% due to a low transformation of both TPA and EG to CO₂. For TPA, gamma-ray treatment largely reduced biodegradability(BOD_5/COD) by degrading TPA to non-biodegradable organic acids. This implies that the change of biodegradability should be considered when the radiation treatment is combined with conventional biological techniques. A weight-loss wastewater containing TPA and EG was also purified by gamma-ray treatment. Extraordinarily, biodegradability of the wastewater was increased at a low dose of 1 kGy. Though underlying mechanism was not clearly identified, this result stresses the effect of wastewater composition and absorbed dose on the biodegradability change. |