COD, TN and TP removal efficiency was studied in different C / N in the system by changing the dosage of CH3COONa. The best results obtained by experiment is that when the C / N is between 4 and 6. The average COD effluent concentration is 40.08mg / L, the removal rate is 87.5%;the average TN effluent concentration is 9.32 mg / L, the removal rate is 83.91%; the TP average effluent concentration is 1.02 mg / L, the removal rate is 88.1%. Too high or too low C / N is not conducive to removal rate of system.
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