상향류식 협기성조 무산소조 및 수차호기조를 이용한 하수처리시 수리학적 체류시간의 변화와 메디아 충진이 질소 및 인 제거에 미치는영향

The EfTects of Changing of Hydraulic Retention Time and Charging Media on the Removal of Nitrogen and Phosphorus in the Up-flow Anaerobicl Anoxic Reactor and Water-mill for Sewage Treatment

Tbε aims of this study is to examine the effects of the ehanges in HRT(Hydraulìc Retention Time) and media charge in a wer-mill ， among other operation factors, on the nitrogen and phosphorus removal in order to use upf10w anaerobie reactors, anoxic reactors and water -mill aerobic reactors for sewage treatrnεnt. The extension of HRT improved the niσugen remova1 efficiency, however the remova1 pattern was constant regardless of HRT, The remova1 of phosphorus was constant (80%-90%) regardless of the change in HRT, ηle remova1 rate with change in inf1ux load varied such that at the OLR (Organìc Load Rate) of 1-3 kg/d, the T-N removal efficiency was 80,7%- 88,9% and the T-P removal efficiency was 82,9%-89,3% while at the NLR (Nilrogen Loading Rate) of 0.108- 0,156 kgfd the removal efficiencies were 80.7-88,9% (T-N) and 82.9-89.3% (T-P), The analyses of the nitrogen and phosphorous remova1 characteristics with the CIN and CIP ratio showed that the mεan T-N removal rate was 88% at the CIN ratio of 1.2-2.6, and that the mean T -P removal rate was 86% at the CIP ratio of 7.2-14.1. Also, the ana1- ysis of nitrogen and phosphorous removal charaeteristics wcrc analyzed in rclation to media charge, The comparison between with and without media charge in the water-mill showed that whíle thε nitrogen removal effïciencies were 86-94% and 85-89% respectively, the diff.εrence of phosphorous removal efficiencies were between the two con ditions was not significant, thus it suggested that the media chargε has less effect on the removal efficiency of phosphorous compared to that of nitrogen.