The effects of zero-valent iron (ZVI) and ferroferric oxide (Fe3O4) on anammox activity and granulation in anaerobic continuously stirred tank reactors (CSTR)
2014
Gao, Fan | Zhang, Hanmin | Yang, Fenglin | Li, Haijun | Zhang, Rong
The anammox granules with Fe and Fe3O4 as cores were successfully obtained in anaerobic continuously stirred tank reactors (CSTR) in this study. The sizes [d(0.5)] of Fe-anammox and Fe3O4-anammox granules successively arrived to 417.3μm and 988.5μm on the 39th and 72nd day, corresponding to the specific anammox activity (SAA) of 0.24 and 0.239kgNkgVSS−1d−1, respectively. The SAA of blank-anammox granule was stable (about 0.20kgNkgVSS−1d−1) in the whole study. The anammox granulation mechanisms of common anammox granule (blank-anammox granule) and Fe-anammox/Fe3O4-anammox granule were extracellular polymers (ECP) bonding model and ion-bonding model, respectively. Results showed that the optimal oxidation–reduction potential (ORP) of anammox bacteria was 209mV. The reasonable concentration of Fe2+ and Fe3+ was beneficial to the granulation and activity of anammox bacteria by maintaining high ORP and gathering acylhomoserine lactones (AHLs). The quorum sensing (QS) material of anammox bacteria was identified as N-dodecanoyl homoserine lactone by LC–MS.
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