Chen Yong-Zhi, Peng Yong-Zhen, Wang Jian-Hua, Zhang Liang-Chang
Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
Huan Jing Ke Xue. 2011 Jan;32(1):193-8.
The behaviors of biological phosphorus (P) and nitrogen (N) removal in a lab-scaled anaerobic/anoxic/oxic-biological aerated filter (A2/O-BAF) combined system were investigated during the treatment of real domestic wastewater with the temperature at 15 degrees C, the C/N ratio of 4.9 and internal recycle ratio of 100%, 200%, 300% and 400%. Experimental results clearly showed that COD, N and P can be simultaneously deeply removed in this combined system. When the total HRT was 8.0 h, SRT was 15 d,sludge recycle ratio was 100% and MLSS was 4.0 mg x L(-1), the concentrations of COD, total phosphorus (TP) and ammonia nitrogen could be reached to less than 50.0, 0.5 and 1.0 mg x L(-1) in the effluent, respectively. The concentrations of total nitrogen (TN) could be reduced from 70.9, 72.1, 70.6 and 73.3 mg x L(-1) in the raw wastewater to that of 24.8, 16.5, 9.6 and 8.7 mg x L(-1) in the effluent, respectively. The removal efficiencies of TN were 65.0%, 77.1%, 86.4% and 88.1%, respectively. There was no distinct relationship between the internal recycle ratio and the removal efficiencies of COD, TP and ammonia nitrogen. However, the removal efficiencies of TN increased with the increasing of the internal recycle ratio, the rising rate was descending. Both the capacity of denitrifying and phosphorus removal in anoxic zone increased simultaneously with the increasing of the internal recycle ratio. Batch tests indicated that the population of denitrifying polyphosphate-accumulating organisms (DPAOs) was up to 40.5% of the total phosphate-accumulating organisms (PAOs).
在温度为15℃、碳氮比为4.9、内回流比分别为100%、200%、300%和400%的条件下，研究了实验室规模的厌氧/缺氧/好氧曝气生物滤池（A2/O-BAF）组合系统处理实际生活污水时生物除磷和脱氮的行为。实验结果清楚地表明，该组合系统能够同时深度去除化学需氧量（COD）、氮和磷。当总水力停留时间（HRT）为8.0 h、污泥龄（SRT）为15 d、污泥回流比为100%且混合液悬浮固体浓度（MLSS）为4.0 mg·L⁻¹时，出水的COD、总磷（TP）和氨氮浓度分别可降至50.0、0.5和1.0 mg·L⁻¹以下。总氮（TN）浓度可分别从原污水中的70.9、72.1、70.6和73.3 mg·L⁻¹降至出水中的24.8、16.5、9.6和8.7 mg·L⁻¹。TN的去除效率分别为65.0%、77.1%、86.4%和88.1%。内回流比与COD、TP和氨氮的去除效率之间没有明显关系。然而，TN的去除效率随着内回流比的增加而提高，上升速率逐渐下降。随着内回流比的增加，缺氧区的反硝化和除磷能力同时增强。批次试验表明，反硝化聚磷菌（DPAOs）的数量占总聚磷菌（PAOs）的40.5%。
