The wastewater produced in the process of canning fruit contains a syrup that consists mainly of sucrose. This syrup wastewater was treated by methane fermn. in an upflow anaerobic sludge blanket reactor. The org. loading rate of syrup wastewater was increased gradually as fermn. progressed. The higher the org. loading rate, the more methane gas evolved until the org. loading rate reached 30.3 kg COD m-3 d-1, at which point methane generation abruptly diminished because the loading rate was too high to stably operate the reactor. The changes in the microbial community, that of both bacteria and archaea in the granules, were analyzed simultaneously using PCR-DGGE during the fermn. process. Methanosaeta spp., which are methanogenic archaea that produce extracellular polymers indispensable for the formation of granules, were dominant when the methane gas vigorously evolved, and the iron-reducing bacterium belonging to genus Geobacter, which outcompetes methanogens, grew proportionally with the deterioration of methane fermn.
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