| Title |
The Influence of Flow Characteristics of Oxic Reactor on Organic and Nitrogen Removal in a Swine Wastewater Treatment System using A2 / O Process |
| Authors |
윤조희 ; 김용석 ( Cho Hee Yoon ; Yong Suk Kim ) |
| Abstract |
This study was performed to investigate and evaluate the treatabilities and the behavior characteristics of organics and nitrogen in two-type swine wastewater treatment systems using anaerobic-anoxic-oxic (A₂/O) process. Two-type systems were distinguished by flow pattern in oxic process. One was named plug flow reactor(PFR) and another was named completely mixed flow reactor(CMFR). These systems were applied to a laboratory scale reactor in the range 0.2∼1.0 ㎏TOC/㎥/d with a temperature of 22±1℃. And a total of 32 hours hydraulic retention time(HRT) including 8/8/16 hours of anaerobic/anoxic/oxic zones was used to simulate the swine wastewater treatment plants with an average 4,000㎎/L MISS with the external/internal recycle of 100/300 percentage ratios for all experiment. The two systems behaved almost identically for TOC removal efficiency, but a few difference in the TN removal efficiency was observed. Average removal efficiencies for TOC in their two systems were 83.5% and 82.2%, and for TN 78.1% and 75.7%, respectively. High nitrogen loading rates and high ratios of nitrogen and organics were appeared not to be oxided to nitrate nitrogen(NO₃-N) and to cause nitrite nitrogen(NO₂-N) accumulation despite of operating l6 hours HRT for nitrification under oxic process. |