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KMID : 1024519950040030221
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Journal of the Environmental Sciences
1995 Volume.4 No. 3 p.221 ~ p.228
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Effect of Hydraulic Loading on Biofilm Characteristics in an Inverse Fluidized Bed Biofilm Reactor
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Kim Dong-Seog
Choi Yoon-Chan
Park Moon-Ki
Choo Suek-Yuel
Song Seung-Koo
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Abstract
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Stability of reactor and effect on biofilm characteristics were investigated by varying the hydraulic residence time in an inverse fluidized bed biofilm reactor(IFBBR). The SCOD removal efficiency was maintained above 90 % in the HRT range of 12hr to 2hr, but the TCOD removal efficiency was dropped down to 50% because of biomass detachment from overgrown bioparticles. The reactor was stably operated up to the conditions of HRT of 2hr and F/M ratio of 4.5kgCOD//day, but above the range there was an abrupt increase of filamentous microorganisms. The optimum biofilm thickness and the biofilm dry density in this experiment were shown as and , respectively. The substrate removal rate of this system was found as 1st order because the biofilm was maintained slightly thin by the increased hydraulic loading rate,
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KEYWORD
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inverse fluidized bed, bioflm reacter, hydraulic loading
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