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In this study, a novel acryl fi ber biomass carrier (ABC) was applied for anammox research in an up-fl ow column reactor. This material could retain anammox microorganism effi ciently and the average weight of attached sludge in the bottom part of the reactor was calculated to be . g‒TSS/cm ABC. High removal effi ciencies of ammonium, nitrite and TN were obtained at a high volumetric loading rate of . kg‒TN/m /d. Furthermore, anammox activity did not decrease signifi cantly with decreasing temperature, e.g., when the temperature decreased from . °C to . °C, nitrite removal effi ciencies decreased only about % (from % to %). Scanning electronic microphotographs revealed that the microorganisms were in a compacted state when attached on the support material. Based on the analysis of S rDNA, two close matches of anammox bacteria, KSU‒ and KOLL a, were detected. This material showed potential for treatment of wastewater with low concentrations of nitrogen using a short hydraulic retention time.

Anammox Treatment Potential in an Up-Flow Column Reactor using a Novel Acrylic Fiber Biomass Carrier