Abstract：The denitrification performance of sludge thermal hydrolyzed (TH) liquor, as an external carbon source, was investigated by analyzing the nitrogen removal efficiency of a lab-scale sequencing batch reactor (SBR), the nitrogen and carbon mass balance, and the variations of extracellular polymeric substances (EPS) of activated sludge, along with the comparison of the results with sodium acetate, as a traditional carbon source. The results showed that the total nitrogen (TN) concentrations of effluent were reduced from 27.64mg/L to 12.05mg/L with the dosage of TH liquor and 7.98mg/L with the dosage of sodium acetate, respectively, indicating that the nitrogen removal ability could be improved by them. The nitrogen and carbon mass balance analysis results revealed that the TN removal efficiency was increased from 47.83% to 81.30% due to the dosage of TH liquor. Meanwhile, the nitrogen removal amount improved by TH liquor significantly exceeded the nitrogen added into the system. The introducing of TH liquor and sodium acetate could increase the EPS concentrations of activated sludge, especially the sodium acetate, which could lead a higher sludge volume index (SVI).
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