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역 유동층 생물막 반응기에서 유기물의 농도 부하와 수리학적 부하의 변동에 따른 생물막 성상과 COD 처리효율
Biofilm Characteristics and COD Removal Efficiency of an Inverse Fluidized Bed Biofilm Reactor with the Change of Both Substrate Loading and Hydraulic Loading
HWAHAK KONGHAK, February 1996, 34(1), 44-49(6), NONE
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Abstract
역 유동층 생물막 폐수처리 반응기에서 수리학적 부하와 농도 부하를 달리한 실험을 행하여 이에 따른 COD의 처리효율, 생물막의 두께, 생물막 밀도 및 biomass 농도의 변화 등을 고찰하였다. 농도 부하를 높게 가한 경우에서는 높은 유기물 농도에 의한 미생물의 충격이 크게 나타났고, 수리학적 부하를 가한 경우에서는 미생물의 충격이 상대적으로 적게 나타났으므로, 수리학적 부하를 가한 경우에서 반응기를 더 안정적으로 운전할 수 있었다. 또한 농도 부하를 증가시킨 경우에서는 bioparticle의 외부 biomass는 헐겁게 부착되고 사상성 물질이 많았으므로 생물막 건조밀도는 낮았다. 그러나 수리학적 부하에서 나타난 bioparticle은 그 모양이 매끄럽고 생물막 건조밀도도 높게 나타났다. 최대 비기질 제거속도의 고찰에서도 수리학적 부하를 가한 경우가 농도 부하를 가한 경우보다 약 2배정도 높게 나타났다.
The effects of substrate or hydraulic loading on COD removal efficiency, biofilm thickness, biofilm density and biomass concentration were investigated in an inverse fluidized-bed biofilm reactor(IFBBR). The shock on the microorganisms in the case of hydraulic loading was smaller than in that of substrate loading. Thus, the reactor was more stably operated in hydraulic loading in comparison with in substrate loading. At the change of substrate loading the external biomass of bioparticle was more loosely fitted and filamentous, and the biofilm dry density was lower than those in the case of hydraulic loading. The maximum specific substrate removal rate of hydraulic loading was also found about twice higher than that in the case of substrate loading.
Keywords
References
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Denac M, Miguel A, Dunn IJ, Biotechnol. Bioeng., 31, 1 (1988)
Converti A, Borghi MD, Ferraio G, Chem. Eng. J., 52, B21 (1993)
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김동석, 박영식, 윤준영, 송승구, 대한환경공학회지, 16(7), 877 (1994)
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Ro KS, Neething JB, J. WPCF, 62(7), 901 (1990)
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Wongsamuth R, Doran PM, Biotechnol. Bioeng., 44, 4818 (1994)
Trinet F, Heim R, Chang HT, Rittmann BE, Water Sci. Technol., 23, 1347 (1991)
