中文摘要：

采用自制连续流生物膜反应器,控制进水pH在6.0~8.0,考察pH对生物膜SND脱氮效果和N_2O产量的影响。结果表明,NH4＋-N去除率随pH的升高而提高,pH由6.0升高到8.0时,NH4＋-N去除率由70.66%提高到95.56%;TN去除率随pH的升高先升高后下降,当pH为7.5左右时,TN去除率达到70.98%,生物膜SND效果为佳。pH对N_2O的产量影响较大,pH为6.0时,系统N_2O产量最大,转化率也最高,为3.54%左右。随着pH的升高,系统中N_2O的释放量逐渐降低。pH=6.0时N_2O的产量是pH=8.0时的2.4倍左右。从SND脱氮效果和控制N_2O产量2方面考虑,将进水pH控制在7.5左右比较合理,既可以达到良好的脱氮效果,又可以减少N_2O的产量。

英文摘要：

Continuous flow biofilm reactor were operated under different pH （ range from 6.0~8.0） to investigate the effect of nitrogen removal on simultaneous nitrification and denitrification （SND） and the nitrous oxide （N2O） emission. The resuits showed that, the NH4^＋-N removal rate increased with pH increasing, when the pH increased from 6.0 to 8.0, the NH4^＋-N removal rate increaged from 70.66% to 95.56%; but the TN removal rate increased first, and then descended with pH increasing, especially when the pH was about 7.5, TN removal rate was 70.98% and the effect of nitrogen removal on SND in biofilm reactor was the optimal. The pH could also show impacts on the production of N2O, especially when the pH was about 6.0, the production of N2O in the system was maximization with the N2O conversion rate at 3.54%, the highest point. More importantly, with pH increasing, the production of N2O would gradually decrease in the system, and it＇s production of N2O at 6.0 was 2.4 times as 8.0. So considering about the SND nitrogen removal and the control of the production of N2O, the pH should be controlled at around 7.5, a relatively reasonable pH, which could not only achieve better effect of nitrogen removal, but also reduce the production of N2O.