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The effect of organic carbon source on the granulation of anaerobic ammonium oxidation (Anammox) sludge was tested in two parallel SBRs by gradually increasing the concentration of organic carbon source (R1) and by adding no organic carbon (R2). Results showed that appropriate concentration of organic carbon source ( 230 mg/L) disintegrated sludge, reduced particle size, and worsened sludge settling performance significantly. Organic carbon source with a concentration lower than 110 mg/L promoted the anaerobic ammonia oxidation by denitrification, thereby improving N-removal efficiency. In contrast, when the concentration of organic carbon source was higher than 110 mg/L, anaerobic ammonia oxidation was inhibited and N-removal efficiency was decreased. Therefore, the concentration of organic carbon source should be equal to or lower than 110 mg/L during the operation of Anammox reactor. © 2018, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
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