| Title |
COD and Nitrogen Removal from Sewage in a Modified Intermittent Aeration Process ( MIAP ) |
| Authors |
전항배(Hang Bae Jun),김병군(Byong Goon Kim),서인석(In Seok Seo),이상형(Sang Hyung Lee) |
| Abstract |
A Modified Intermittent Aeration Process (MIAP) composed of a intermittent aerobic reactor followed by aerobic and anoxic reactors in series was developed for removal nitrogen from the sewage having low TCOD/T-N ratio easily encountered in local area. The intermittent aerobic reactor of MIAP was operated in the several combinations of aeration/unaeration, such as 15min/15min, 30min/45min and 60min/60min. And organic loading effect on nitrogen removal was studied by adding glucose to the raw sewage. TCOD and SCOD removal was complete in any operating conditions, so the effluent TCOD showed below 30 ㎎/L. T-N removal efficiency was as high as 90% at TCOD/T-N ratio of 8.5 with glucose addition, however, that was lowered to 68% at TCOD/T-N ratio of 5.1 without glucose addition. In MIAP, the consumed COD to denitrify 1㎎ of nitrate was 6.6 ㎎, and total COD requirement to remove l.0㎎ of T-N was 7.8 ㎎. Nitrate in effluent was 12 ㎎/L without glucose addition, and it did not changed much at the different combinations of aeration/unaeration. Removal characteristics of COD and T-N did not changed at the different combinations of aeration/unaeration, however, nitrate was fluctuated at each beginning of the changed operating conditions. |