In order to investigate the effects of different types and dosages of carbon sources on denitrification of activated sludge which was taken from the aeration phase of SBR technology sewage treatment plant,four different types of carbon sources, i. e. sodium acetate, ethanol, glucose and methanol were selected respectively at the level of MLSS 3500 mg/L,pH 7. 2 ～ 8. 0,and temperature 26 ± 0. 5℃ with first aerobic aeration (1. 5 hours) plus anoxic agitation mixing with additional carbon sources. The results showed: (1) with sodium acetate as the carbon source, the denitrification rate was 13. 27 mgN / (L · h); (2)compared with sodium acetate, the reaction was similar with the ethanol as the carbon resource of denitrification, but denitrification rate was 4. 2 mgN/(L · h) ; (3)glucose was more difficult to be used as the carbon resource for denitrification with the average denitrification rate 1 mgN/(L · h) ; (4) when adding methanol as carbon source, there was no obvious effect on denitrification. In practical engineering, to meet the need for short-term dosing carbon source,sodium acetate is recommended to be used.
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