| Title |
Tertiary Treatment of Sewage by Micro Bubble Ozone and BAF System |
| Authors |
강동한 ( Dong Han Kang ) ; 장영호 ( Young Ho Jang ) ; 김종수 ( Jong Su Kim ) ; 김극태 ( Keug Tae Kim ) |
| Keywords |
Advanced oxidation process (AOP); Biological aerated filter (BAF); Dissolved organic carbon (DOC); SUVA; Wastewater |
| Abstract |
In this paper, the removal characteristics of dissolved organic carbon (DOCs) by micro bubble ozonation process and O3/UV process were comparatively studied. In the point of DOC removing reaction coefficient, micro bubble ozonation system and O3/UV process had not significant difference, 0.0120 sec-1 and 0.0141 sec-1. Therefore micro bubble ozonation process is more suitable for tertiary treatment of sewage in the point of installation and maintenance cost-reducing. The optimum ozone injection rate was 2.0 g O3/g DOC and HRT was 3 min for the micro bubble ozonation process. The removal efficiency of DOC and SUVA in micro bubble ozonation system was 32.8% and 58.3% respective. Biological aerated filter (BAF) process was installed to remove soluble organic material increased by micro bubble ozonation system. And the effluent BOD of BAF was below 1.0 mg/L. In the view of cost-effectiveness, O3/BAF process was more profitable than O3/UV/BAF process for tertiary treatment of sewage. In order to nitrify ammonia in the BAF process completely, NH4+-N concentration in the influent water of BAF should be designed considering low water temperature in the winter season. |