两段曝气生物滤池的同步硝化反硝化特性

 采用两段曝气生物滤池进行了实际生活污水的试验研究,控制 A 段水力负荷在 22.01m³/(m²d),气水比为 6:1,研究了 B 段气水比分别为 3:1、2:1 和 1:1 时,反应器的运行情况.结果表明,两段曝气生物滤池处理生活污水的出水稳定,当 B 段反应器的气水比为 2:1 时,去除效果最佳.B段具有明显的同步硝化反硝化特征,当气水比较低时主要进行短程的同步硝化反硝化.对B段反应器0.9m高度处的生物膜进行了静态试验,结果表明,生物膜的比硝化速率为 1.458mg NH₃-N/(gMLSS·h);当 DO 和 pH 值等影响因子适宜的情况下,有机碳源的存在不影响硝化作用的进行;反硝化过程中,对亚硝酸进行反硝化的速率比对硝酸盐进行反硝化的速率高 1.15 倍,缩短了反硝化所需时间.

The simultaneous nitrification and denitrification characteristics of two-stage biological aerated filter

The two-stage biological aerated filter (BAF) was adopted to carry out the experimental study of actual domestic wastewater, the hydraulic loading of 22.01m3/(m2?d) and the air/water ratio of 6:1 at A-stage were controlled, when air/water ratio was 3:1, 2:1and 1:1 respectively at B-stage, the operation state of reactor was studied. The effluent quality was stable and excellent, and the removal effect of every pollutants was the best when the air/water ratio was 2:1 at B-stage reactor. B-stage possessed marked of simultaneous nitrification and denitrification characteristics. Short-cut simultaneous nitrification and denitrification was carried out mainly when air/water ratio was lower. Static experiment was carried out for biofilm at 0.9-meter height of B-stage reactor. The specific nitrification rate of the biofilm was 1.458mg NH3-N/(gMLSS?h); the existence of organic carbon source did not affect the operation of nitrification under the adaptable state of affecting factors, such as DO and pH, et al. In denitrification process the denitrification rate over nitrite was 1.15 times higher of that over nitrate, thus, the denitrification time was also shortened.