Abstract
As completely autotrophic nitrogen removal process, one-stage anammox has attracted attention world-wide. A nitrogen removal process via one-stage anammox with suspended biomass carrier was operated in CSTR reactor. On the basis of surpassing the activity of NOB, the start-up of the one-stage anammox via the symbiosis of AOB and Anammox bacteria could be achieved in about 80 days. Under the condition of 25°C, the packing ratio of carriers as 30%, NLR as 0.5kgN/m3/d , the average and maximum nitrogen removal efficiencies were 69.6%, 81.1%. In addition, the nitrogen removal efficiency maintained as 69.6% averagely even though the NLR was doubled. The results of activity experiment revealed that on one hand AOB exist in both the surface of carriers and suspended sludge; on the other hand, the vast majority of Anammox bacteria grew in the surface of carriers. Furtherly, the symbiosis of AOB and Anammox bacteria in carriers was confirmed, which may deduce that carrier provided huge space for the growth of both AOB and Anxmmox. At last, the nitrogen removal potential could be deduced that the maximum nitrogen removal capacity was 2.56kgNH4+-N/m3/d.
