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The anaerobic ammonium oxidation (anammox) process was successfully started up from conventional activated sludge using a hybrid bioreactor within 2 months. The average removal efficiencies of ammonia and nitrite were both over 80%, and the maximum total nitrogen removal rate of 1.85 kg N/(m 3 ·day) was obtained on day 362 with the initial sludge concentration of 0.7 g mixed liquor suspended...
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