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Changes of Nitrifying Bacterial Populations in Anaerobic-Anoxic-Oxic Reactors  

Park, Jong-Woong (Department of Health Environment, Daegu Hanny University)
Lee, Young-Ok (Division of Life Science, Daegu University)
Go, Jun-Heok (Department of Health Environment, Daegu Hanny University)
Ra, Won-Sik (Department of Health Environment, Daegu Hanny University)
Lim, Uk-Min (Department of Health Environment, Daegu Hanny University)
Park, Ji-Eun (Division of Life Science, Daegu University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.2, 2005 , pp. 138-144 More about this Journal
Abstract
This study was carried out to investigate the changes of nitrifying bacterial populations including Nitrosomonas sp. and Nitrobacter sp. in $A^2/O$ pilot plant with the configuration of anaerobic-anoxic-oxic reactors. The suspended nitrifying bacterial populations in mixed liquor and those of attached populations on granular carrier surface made by molded waste tire were analyzed by Fluorescent in situ Hybridization(FISH) method. The nitrification rate of a pilot plant showed the value of $1.97{\sim}2.98\;mg\;N/g$ MLVSS hr. The ratios of suspended ammonia oxidizer including Nitrosomonas sp. (NSO) to total bacteria in each reactor were oxic < anoxic < anaerobic. On the contrary, the ratios of suspended nitrite oxidizer including Nitrobacter sp. (NIT) were anaerobic < anoxic < oxic. The thickness, dry density and mass of the attached biomass on granular carriers were $180{\sim}188\;{\mu}m$, $38.5{\sim}43.9\;mg/cm^3$, $29.4{\sim}32.5\;mg/g$, respectively. Also, the ratios of attached nitrifier to total bacteria on granular carriers were similar regardless of ammonia/nitrite-oxidizer (NSO; 3.2%, NIT; 2.8%) and very low compared to those(NSO; $22.8{\sim}28.4%$, NIT; $17{\sim}26%$) of suspended nitrifier.
Keywords
$A^2/O$ Pilot Plant; Nitrifier; Biofilm; FISH Method; Nitrification Rate;
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