Performance of Anaerobic Fluidized/Expanded Bed Reactor Using Corn Cob Flour as Microcarriers.
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We investigated the treatment characteristics of the fluidized/expanded bed reactor (reactor A) using corn cob flour (CCF) as microcarriers and compared it to a UASB reactor (reactor B) .The fluidized/expanded bed reactor using CCF was used as a methane fermentation reactor of mesophilic two-phase digestion type, and synthetic wastewater used in this study was a mixtere of volatile fatty acids. The loading rates in both reactors were increased gradually by mainly decreasing the hydraulic retention time (HRT) .After 120 days, COD loading rate in reactor A was 30kg-CODcr⋅m<SUP>-3</SUP>⋅day<SUP>-1</SUP> with a biogas production of about 90<I>l</I>⋅day<SUP>-1</SUP>.On the other hand, the COD loading rate in reactor B was over 20kg-CODcr⋅m<SUP>-3</SUP>⋅day<SUP>-1</SUP> after 90 days with a biogas production of about 85<I>l</I>⋅day<SUP>-1</SUP>. The methane content and gas yield in both reactors were calculated to be 70-80% and 600<I>l</I>⋅kg-COD removed<SUP>-1</SUP> for reactor A and 70-80% and 570<I>l</I>⋅kg-COD removed<SUP>-l</SUP> for reactor B. The lag between the start-up period in reactor A compared to that in reactor B appears to be affected by the amount of anaerobic seed sludge. The low C3-VFA removal rate caused the accumulation of propionic acid. The operation of both the reactors resulted in the accumulation of granule-like particles made up of anaerobic microorganisms. We found cocci, short rods and rod-type microorganisms on the surface of both sludges. These microorganisms resembled the genus of <I>Methanococcus, Methanobacterium</I> and <I>Methanothix</I>. From this data, it was concluded that CCF may be utilized as microcarriers for the fluidized/expanded bed reactor.
- 日本水処理生物学会の論文
日本水処理生物学会 | 論文
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