A2O-BAF联合工艺处理低碳氮比生活污水

为了实现低ρ（C）/ρ（N）比实际生活污水有效的脱氮除磷，以A-SBR和N-SBR构成的双污泥反硝化除磷系统（A₂N₂）为研究对象，重点研究反应器在不同进水量（用进水比表征）和硝化液回流量（用内交换比表征）条件下对各污染物的去除情况.A-SBR单元厌氧1.5 h，缺氧2 h，好氧10 min，而N-SBR硝化单元一次硝化和二次硝化时间分别为4、1 h，A-SBR和N-SBR单元的曝气量恒定，N-SBR填料填充率为66%.在此条件下，通过改变进水比R₁（70%、75%、80%）和内交换比R₂（70%、75%、80%），做了9个平行试验.试验结果表明：在不同的进水比和内交换比条件下，A₂N₂系统都能稳定而高效地将有机物去除，各阶段平均COD去除率均在80%以上.而在TN的去除性能上有较大的差异，去除率为61.67%~78.3%.在进水比和内交换比分别为70%和80%时，A₂N₂系统脱氮效果达到最佳，平均TN去除率高达78.3%，平均出水TN质量浓度为9.2 mg/L，在除磷方面，内交换比由70%增加到80%，反硝化除磷率保持在99%以上，出水磷质量浓度在0.1 mg/L以下.

Biological phosphorus removal from waste-water by Anaerobic-Anoxic Sequencing batch reactor

To achieve effectiveness of nitrogen and phosphorus removal, a two-sludge denitrifying phosphorus removal system (A₂N₂) was used to treat low ρ(C)/ρ(N) ratio real domestic wastewater. Based on different influent flows (characterized by influent ratio) and nitrifying fluid return flows(characterized by exchange ratio) conditions, the system achieved efficient denitrifying phosphorus removal performance. The experiment was conducted as follows:anaerobic was set as 1.5 h, anoxic was 2 h, and aerobic was 10 min in the A-SBR unit. First the nitrification duration time was 4 h. Second, the nitrification duration time was 1 h in the N-SBR units. The aeration flow rate of A-SBR and N-SBR units was 100 and 120 L/h, respectively, and the filling rate was 66%. Under this condition, nine different parameters were experimentally tested by varying the influent ratio R₁ (70%, 75%, and 80%) and the exchange ratio of R₂ (70%, 75%, and 80%), respectively. Results show that under the condition of different influent ratios and exchange ratios, the A₂N₂ system can remove COD stably and efficiently. The average COD removal rate in each stage is above 80%. However, the removal performance of TN is significantly different, which is 61.67%-78.3%. When the influent ratio and exchange ratio are 70% and 80%, the TN removal rate of A₂N₂ system is the best, which is 78.3%. The average effluent TN is 9.2 mg/L. In the aspect of phosphorus removal, the exchange ratio increases from 70% to 80% and the denitrifying phosphorus removal rate remains above 99%. The effluent phosphorus concentration is below 0.1 mg/L.