Abstract
This study investigates the effects of temperature on ammonia oxidizing bacteria activity in a partial nitritation (PN) sequencing batch reactor. Stable PN was achieved in a 250L SBR with a minimum operating volume of 111L treating mature landfill leachate containing an ammonium concentration of around 6000mg N-NH4+L−1 at both 25 and 35°C. A suitable influent to feed an anammox reactor was achieved in both cases. A kinetic model was applied to study the influence of free ammonia (FA), the free nitrous acid (FNA) inhibition, and the inorganic carbon (IC) limitation. NH4+ and NO2− concentrations were similar at 25 and 35°C experiments (about 2500mg N-NH4+L−1 and 3500mg N-NO2−L−1), FA and FNA concentrations differed due to the strong temperature dependence. FNA was the main source of inhibition at 25°C, while at 35°C combined FA and FNA inhibition occurred. DGGE results demonstrated that PN-SBR sludge was enriched on the same AOB phylotypes in both experiments.
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