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KMID : 0380019930080050431
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Korean Journal of Biotechnology and Bioengineering
1993 Volume.8 No. 5 p.431 ~ p.437
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Relationship among Physical & Chemical Properties of Supports and Performance of Methane Fermentation in Anaerobic Fluidized-Bed Reactor
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조무환/Cho, Moo Hwan
남영섭/정재학/김정목/Nam, Yeung Sub/Jeung, Jae Hag/Kim, Jeong Mog
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Abstract
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Active carbon which has the smallest bulk and wet density was found as the best support media among 4 different kinds of materials(celite, natural zeolite, Pusuk stone, active carbon) to make a proper f luidized-bed with small energy consumption. Its minimum and optimum f luidization velocity were found as 0.03 cm/sec and 0.25 cm/sec, respectively.
As organic loading rate for methane fermentation was increased, COD,, removal efficiencies of all the media were decreased. But, COD,, removal efficiencies of active carbon was maintained more than 90% in this experimental range of the organic loading rate.
Larger amount of microorganism was adsorbed on the active carbon which has very high specific surface area. At the organic loading rate of 16g COD,,/ P . day, its adsorbed cell mass was 157mg/g.
Comparing natural zeolite with roast celite, adsorbed cell mass did not increase in proportion to specific surface area of the media. Even though roast celite has the same specific surface area as the Pusuk stone, its organic removal ability was superior to that of the Pusuk stone, which explains that the relatively great surface roughness and the positive surface charge are important for cell adsorption. It was concluded that the support media for anaerobic fluidized reactor should have small wet density and small fuidization velocity, if possible, in order to increase cell adsorption by reducing the fluid shear stress.
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