An anaerobic sequencing batch reactor (ASBR) was operated to investigate the effect of COD/NH4+-N on carbon and nitrogen removal via anaerobic ammonium oxidation and denitrification by gradually increasing influent ammonia concentration. The results showed that when COD and NO2--N were 300 and 145mg/L, respectively, COD/NH4+-N was the main factor affecting the nitrogen removal contribution by anammox process. However, the ratio of COD/NH4+-N had no significant effect on nitrite remove. When COD/NH4+-N was 1~3.25, the nitrogen removal contribution rate made by anammox process was 73.03%. When COD/NH4+-N was 3.75, it declined from 71.76% to 55%. When COD/NH4+-N was 4.25~5.25, anammox and denitrification played equal role in nitrogen removal. When COD/NH4+-N was 6.5~12.5, the nitrogen removal contribution rate made by denitrification process increased from 51.69% to 79.62%. Anammox granulation became stronger and stronger in the reactor, and the granular diameter was mainly between 0.6~1.5mm. The settling performance of sludge was good.
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