中文摘要：

采用A／O工艺，以低ρ（C）/ρ（N）实际生活污水为研究对象，首先考察了不加外碳源条件下不同参数条件对脱氮效果的影响，确定了较优运行参数，在较优运行参数下氨氮（ammonia nitrogen，NH4＋-N）平均去除率为100％，总氮（total nitrogen，TN）平均去除率为49．48％，COD平均去除率为82．03％，并在此过程中研究了系统黏性膨胀的发生及变化情况．在此基础上增加外碳源使进水的ρ（C）／ρ（N）提高，研究了高ρ（C）／ρ（N）条件下系统对污染物的去除和系统黏性膨胀进一步变化情况，得到了系统的最优运行工况，最终出水平均ρ（NH4＋-N）、ρ（TN）和ρ（COD）均达到了国家一级A排放标准，SVI也稳定在200mL／g左右．

英文摘要：

By treating real domestic sewage which had low ρ （C）/ρ （N） in A/O process, the nitrogen removal effect was investigated under different parameter conditions without external carbon source, and the better operating parameter was determined. The average removal rates of ammonia nitrogen （ NH4 ＋- N）, total nitrogen （TN） and COD were 100%, 49.48% and 82.03%, respectively, in this situation. The occurrence and development of viscous sludge bulking in this process were also studied. On this basis, the nitrogen removal effect and further development of viscous sludge bulking were investigated under high ρ （C）/ρ （N） condition by putting external carbon sources into the real domestic sewage, then the system reached the best operating parameter. Finally, average p （ NH4 ＋ -N）, ρ （TN） and ρ （COD） in effluent met the national level A emission standard, and SVI was also relatively stable at about 200 mL/g.