Comparison of Anammox Treatment Performances Using Different Kinds of Biomass Carriers

概要

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The anammox process, as an alternative to conventional nitrogen removal technologies,has abstracted much attention in recent years. In this study, two column-type reactorsusing different support materials—net type acrylic fiber (Biofix) and polyesternonwoven—were used for anammox treatment. The nonwoven reactor was operated at35℃ and the Biofix reactor at 25℃ (peak summer temperature, 31.5℃). Over 330 days ofoperation, the nitrogen loading rates of the Biofix and nonwoven reactors were increasedto 3.6 kg-N/㎥/d and 4.0 kg-N/㎥d and T-N removal efficiencies reached to 81.3% and86.3%, respectively. A protein substance was shown to be the most abundant extracellularpolymeric substances (EPS) in the anammox sludge with almost three times more in thegranular sludge of the Biofix reactor than in the granular sludge of the nonwoven reactor.Considering the EPS levels and observation by scanning electron microscopy, the anammoxgranules in the Biofix reactor were denser than that in the nonwoven reactor. Results ofDNA analyses indicated that the KSU-1 strain might prefer relatively low nutrient levels,while the KU2 strain might be better suited for the high media concentration. Other kindsof bacteria were also identified with the potentials for consuming the dissolved oxygen inthe influent and facilitating anammox bacteria surviving under aerobic conditions.
2009-03-15