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KMID : 1094720060110030199
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Biotechnology and Bioprocess Engineering
2006 Volume.11 No. 3 p.199 ~ p.204
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Anaerobic Ammonium Oxidation Process in an Upflow Anaerobic Sludge Blanket Reactor with Granular Sludge Selected from an Anaerobic Digestor
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Tran Hung-Thuan
Park Young-Joo
Cho Mi-Kyeoung
Kim Dong-Jin
Ahn Dae-Hee
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Abstract
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The purpose of this work was to evaluate the development of the anammox process by the use of granular sludge selected from a digestion reactor as a potential seed source in a lab-scale UASB (upflow anaerobic sludge blanket) reactor system. The reactor was operated for approximately 11 months and was fed by synthetic wastewater. After 200 days of feeding with NH4+ and NO2- as the main substrates, the biomass showed steady signs of ammonium consumption, resulting in over 60% of ammonium nitrogen removal. This report aims to present the results and to more closely examine what occurs after the onset of anammox activity, while the previous work described the start-up experiment and the presence of anammox bacteria in the enriched community using the fluorescence in situ hybridization (FISH) technique. By the last month of operation, the consumed NO2--N/NH4+-N ratio in the UASB reactor was close to 1.32, the stoichiometric ratio of the anammox reaction. The obtained results from the influent-shutdown test suggested that nitrite concentration would be one key parameter that promotes the anammox reaction during the start-up enrichment of anammox bacteria from granular sludge. During the study period, the sludge color gradually changed from black to red-brownish.
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KEYWORD
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nitrogen removal, anaerobic ammonium oxidation (anammox), granular sludge, UASB reactor, ammonium, nitrite
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