改良倒置A~2/O工艺处理低温生活污水技术

生物脱氮除磷系统中磷的去除通过排放剩余污泥实现,需要短泥龄微生物;而硝化细菌为自养菌,需要较长的生长时间.在低温(＜10℃)条件下,硝化污泥泥龄一般为15～20 d,而聚磷菌泥龄为4～5 d,这种巨大的泥龄差距导致现有A~2/O在低温下很难实现同时脱氮除磷.本文利用改良的倒置A~2/O工艺,研究了低温条件下的生物脱氮除磷效果.结果显示:该工艺低温条件下COD的去除率在85%以上,氨氮去除率低温条件下可达到85%,磷的去除率低温条件下为80%,出水能够达到国家二级排放标准.

Nitrogen and phosphorous removal for low temperture waste water with inverted A~2/O technology

The phosphorus removal by the biological nutrient removal system depends on the exclusion of excess sludge, which requires short SRT micro-organisms; while the nitrifying bacteria is autotrophic, its growth requires a longer time. At low temperature (≤ 10℃), the nitrification sludge age is generally 15-20 d, and PAOs sludge age is 4-5d, this enormous gap resulted in the difficult to achieve simultaneously nitrogen and phosphorus removal at low temperature with the A~2/O process. Thus, the effect of nitrogen and phosphorus removal using improved inverted A~2/O process is studied, through which the COD removal rate of higher than 85%, NH_4~+-N removal of 85% and T-P removal efficiency of 80 % were achieved at low temperature conditions. With this improved inverted A~2/O process, the effluent can reach the national emission standards for secondary water.