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BAF를 이용한 2차 처리수의 재이용 가능성 및 강우시 하수처리장 월류수의 처리
안지훈 ( J. H. Ahn ),박종복 ( J. B. Park ),김성원 ( S. W. Kim ),박재홍 ( J. H. Park ),하준수 ( J. S. Ha ),최의소 ( E. Choi ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.2
The laboratory and pilot scale BAFs (biological aerated filters) were operated with 0.3 hr to 1.1 hr EBCT(empty bed contact time) at a maximum filtration rate of 472 m³/m²/day as a treatment method for reuse of secondary effluent and by-pass flow in this study. The effluent BOD and SS were generally 3.5 to 5 ㎎/L and 2 to 3 ㎎/L, respectively with 2ndary effluent, but the SS concentrations increased to 4 to 8 ㎎/L with the increased flow rates of by-pass flow. Potential nitrification rates were very high, but the nitrogen removal efficiencies were low due to the limited carbon sources. Bypass of a part of primary effluent seemed to be desirable to increase the nitrogen removal. Disinfection must be furnished for the reuse of BAF effluent.
복소음향 인텐시티법을 이용한 소음원검출의 시뮬레이션 및 실차응용
오재응(J. E. Oh),김상헌(S. H. Kim),안지훈(J. H. Ahn) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.3
Sound intensity distributions and energy flow in the nearfield of dipole source system and flat plate were investigated. First, the effectiveness of complex acoustic intensity was proved by using mathmatical and experimental methods in order to indentify noise sources and transmission paths of dipole field which is effected by the presence of neighbouring coherent sources. Next, analytical complex acoustic intensity method was discussed and the characteristics and energy flow of sound induced from the plate are clarified. The velocity of plate obtained from Finite Element Method was used for calculation of complex acoustic intensity in the near field. Finally experimental complex acoustic intensity method was applied to a passenger car. It can be seen that complex acoustic intensity method using both of active and reactive intensity is vital in devising a strategy for the identification and the reduction of vibration and noise.