| Title |
The Characteristics of Organics and Nitrogen Removal with HRT in Biofilm System using A2 / O Process |
| Authors |
윤조희(Cho Hee Yoon),이상훈(Sang Hoon Lee) |
| Abstract |
In this study, the characteristics of organics and nitrogen removal from wastewater with various HRT in fixed biofilm system using anaerobic/anoxic/oxic (A₂/O) process was investigated. Two types of laboratory experimental systems packed with different media, which composed of polyvinylidene chloride fiber and ceramic ball, were used. These systems were operated with HRT of 8hrs through 48hrs at C/N ratio of 4, internal recycle of 200% and 20±2℃. The results were obtained as follows; TOC removal efficiency was showed over 90% of TOC with internal recycle in both reactors while HRT was 8hrs through 24hrs. And the maximum removal efficiency(93%) was obtained at HRT of 24hrs. The removal efficiencies for NH₄-N were 35.1% (reactor1) and 44.9% (reactor2) at HRT of 8hrs and 98.5% (reactor1) and 97.1 (reactor2) when HRT was over 12hrs. The removal efficiencies for TIN were 39.5% (reactor1) and 46.7% (reactor2) at HRT of 8hrs. In both reactors removed 75% of TIN with internal recycle while HRT was 12hrs through 24hrs. On the other hand, the reactor1 and reactor2 removed 46.8% and 51.4% of TIN without recycle at HRT of 48hrs. Of total removed TIN, 44.2% (reactor1) and 54.8% (reactor2) were consisted of denitrification in an oxic basin at the HRT of 12hrs through 24hrs. |