| Title |
Simultaneous Removal of Carbon , Nitrogen and Phosphorus in Swine Wastewater using DynaFlow System |
| Authors |
박승국(Seung Kook Park),김병군(Byong Goon Kim),원성연(Seung Yeon Weon),이상일(Sang Ill Lee) |
| Abstract |
2 stage IAAS (intermittently aerated activated sludge) and DynaFlow (dynamic flow intermittently aerated activated sludge) systems without anaerobic reactor were applied to treat swine wastewater of high strength of organic and nitrogen contents. COD_(cr), TKN and total phosphorus concentration in influent were averaged to 4, 300㎎/L, 650㎎-N/L and 68㎎-P/L, respectively. Removal efficiency of total nitrogen was obtained to over 92%. However, as increase of nitrogen loading to over 0.6㎏-N/㎥ ·day, nitrogen removal efficiency was dropped to 80%. NO₂-N and NO₃-N concentration were increased up to 55㎎/L and 30㎎/L, respectively. The increase of NO_x-N concentration can be attributed to low C/N ratio and toxic effect of free ammonia to Nitrobacter sp.. Sludge rising problem in clarifier was observed as increase of influent TKN of over 600㎎/L. The significant difference in nitrogen removals between 2 stage-IAAS and DynaFlows was observed in starting period. Adaptation period for DynaFlows was only 2 days, whereas that of 2 stage-IAAS was 20 days. This means that DynaFlow was better process to treat nitrogen in fluctuating strength of pollutants. From the experimental results, both 2 stage-IAAS and DynaFlow processes are supposed to feasible processes to treat nutrients in high strength wastewater, such as, poultry and swine wastewater. |