| Title |
Collision Theory between Bubbles and Particles in Dissolved Air Flotation ( DAF ) |
| Authors |
한무영(Moo Young Han),독고석(Seok Dockko),박중현(Chung Hyun Park) |
| Abstract |
Biodegradability test for several hazardous chemicals found in the watershed of Daechung reservoir was investigated by using TOC-HANDAI method that is a combined technology of River Die-away test and HANDAI method. Aniline and phenol were easily mineralized by natural water microcosm and their initial degradation rates of samples from Daechung reservoir were much faster than those from the main streams of Kum rivers. This was probably due to the numbers and the activities of participated microorganisms during their respective degradation. It is obvious that the metabolic pathways of both chemicals were different, showing that phenol started degradation immediately without any adaptation period. Bispenol A(BPA) at each sampling points was appeared to be mineralized 68∼89% of initial TOC concentration by natural water microcosm. BPA seems more recalcitrant against biodegradation than simple aromatic compounds such as aniline and phenol in natural water environments. Moreover, the remaining TOC components in BPA biodegradation considered to be refractory metabolites of BPA. Consequently it is likely that BPA showed semi-recalcitrant while aniline and phenol were biodegradable compounds in the watershed of Daechung reservoir. |