期刊
BIOTECHNOLOGY AND BIOENGINEERING
卷 101, 期 2, 页码 286-294出版社
WILEY
DOI: 10.1002/bit.21891
关键词
anammox process; anaerobic ammonium oxidation; anoxic ammonium oxidation; Kuenenia stuttgartiensis; Brocadia; MBR; cultivation methods; selective pressure; planktonic cells
In a membrane bioreactor (MBR), fast growth of anammox bacteria was achieved with a sludge residence time (SRT) of 12 days. This relatively short SRT resulted in a-for anammox bacteria-unprecedented purity of the enrichment of 97.6%. The absence of a selective pressure for settling, and dedicated cultivation conditions led to growth in suspension as free cells and the complete absence of floes or granules. Fast growth, low levels of calcium and magnesium, and possibly the presence of yeast extract and a low shear stress are critical for the obtainment of a completely suspended culture consisting of free anammox cells. During cultivation, a population shift was observed from Candidatus Brocadia to Candidattis Kuenenia stuttgartiensis. It is hypothesized that the reason for this shift is the higher affinity for nitrite of Kuenenia. The production of anammox bacteria in suspension with high purity and productivity makes the MBR a promising tool for the cultivation and study of anammox bacteria.
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