一体化A_n/O工艺处理市政污水的中试研究

Pilot studies on treatment of municipal wastewater by integrative A_n/O technology

以污水厂初沉池出水作为研究对象，考察了常温（8～20℃）条件下，处理规模为5m3／h的一体化厌氧／好氧生物反应器同步脱氮除磷的效果．试验中，系统脱氮始终存在同步硝化反硝化现象．通过低氧条件下亚硝酸盐的富集，系统进入稳定脱氮期．在稳定脱氮期，反应器出水亚硝酸盐平均累积率达82．52％，系统脱氮以亚硝酸盐型同步硝化反硝化的方式为主，实现了短程同步脱氮及磷和有机物的协同去除．TN，TP和COD平均去除率分别为77．4％，87．7％和90．4％．在该研究条件下，DO质量浓度的最佳控制范围是（0．25±0．10）mg／L．

The discharge from the primary sedimentation tank of a wastewater plant was taken as a study object. The efficiency of simultaneous Nitrogen and phosphorus removal under the normal temperature （8- 20℃） was discussed by use of the integrative An/O bioreactor with a scale of 5 m3/h. The simultaneous nitrification and denitrification （SND） occurred during the Nitrogen removal research. After file nitrite accumulation at low dissolved Oxygen （DO）, the system entered into a stable operation phase. The average nitrite accumulation ratio reached 82.52%. The Nitrogen removal of the system was carried out in the means of the SND via nitrite, and the simultaneous removal of Nitrogen and Phosphorus and other organic matters was successfully realized. The experimental results show that the average removal efi%iency of the total Nitrogen （TN）, the total Phosphorus （TP） and the COD reaches 77.4%, 87.7% and 90.4%, respectively. The low DO concentration level （0.25 ± 0.10） mg/L is regarded as the best operation range.