| Title |
Control of SBB Operation for Piggery Wastewater Treatment with DO and ORP |
| Authors |
전병희 ( Byong Hee Jun ) ; 김도환 ( Do Hwan Kim ) ; 최은희 ( Eun Hee Choi ) ; 김성신 ( Sung Shin Kim ) ; 김창원 ( Chang Won Kim ) ; 배현 ( Hyeon Bae ) |
| Abstract |
A pilot scale SBR (working volume, 20㎥) treating piggery wastewater was operated with real wastewater. The operation mode of intermittent feeding of raw water and sub-cycle with repeating anoxic-aeration conditions were adapted to avoid the high-strength nitrogen inhibition. In sub-cycle, aeration time for nitrification was tried to be controled with ORP and/or DO meter. The characteristics of control was somewhat different between ORP and DO. DO showed potential ability to detect complete ammonia oxidation point by the first order differential values or absolute value. Especially, DO was proved to be useful for high loading rates. ORP indicated the ending point of nitrification by the plateau appearing after bending point. Because ORP can be utilized as a diagnosis tool by its good sensitivity for the microbial condition in reactor, the simultaneous application of DO and ORP was recommended for the stable control of SBR. |