污泥热水解滤液作污水反硝化碳源的脱氮性能

以污泥热水解滤液作为外加碳源，通过对SBR反应器脱氮效果、碳氮平衡及活性污泥EPS的分析，探究了污泥热水解滤液的脱氮性能，并与传统碳源乙酸钠进行了比较.结果表明，污泥热水解滤液和乙酸钠作为碳源可将出水TN从27.64mg/L分别降至12.05mg/L和7.98mg/L，说明两种碳源的投加均能强化反硝化过程；通过碳氮平衡分析可以看出，未加入碳源时污水TN去除率只有47.83%，加入热水解滤液后污水的TN去除率达到了81.30%，且滤液增加的氮负荷远远小于滤液作为外加碳源去除污水中TN的量；加入热水解滤液和乙酸钠时，活性污泥的EPS均有增加，但乙酸钠为碳源时的EPS含量更高，而EPS的增加引起了污泥SVI的增大.

Performance of sludge thermal hydrolyzed liquor as carbon source for sewage denitrification

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).