水力负荷对A／O生物滤池处理生活污水的影响

Effect of Hydraulic Loading on Anoxic-Aerobic BAF in Domestic Sewage

目的研究A／O生物滤池工艺脱碳硝化原理，确定该工艺的运行参数．方法通过试验对比水力负荷变化对COD、NH3-N和TN去除效果的影响．结果试验结果表明：A／O生物滤池的缺氧段对COD、NH3-N和TN的去除起到重要作用．为了达到最佳处理效果，缺氧段要保持在一定的高度范围内，最佳高度在500～600mm；当A／O生物滤池水力负荷为（2～3）m／h，缺氧区与好氧区体积比为1：3时，原水中的COD、NH3-N和TN都取得了较好的去除效果．结论A／O生物滤池水力负荷的增加，回流混合液带入更多的溶解氧，加强水流在滤柱内的扰动，增强了滤柱内的复氧，破坏缺氧滤柱内缺氧环境，这对反硝化及总氮的去除是不利的．

The study focuses on decarbonization and nitrification theory and parameters of Anoxic- Aerobic BAF techniques. The impact of COD, NH3 - N and TN removal performance were established considering hydraulic loading. The test result indicated that anoxic section of Anoxic- Aerobic BAF was vital for COD, NH3 - N and TN removal. In order to obtain the best processing effect, the anoxic section must maintain the height scope of 500 - 600mm. When the Anoxic - Aerobic BAF hydraulic loading was 2 - 3 m/h, the ratio of the anoxic section volume to the aerobic one was 1 ： 3, and the COD, NH3 - N and TN have the best removal effect. The conclusion is that the increase of the hydraulic loading of Anoxic- Aerobic BAF leads more dissolved oxygen to anoxic section with the backflow intermixture and enhances the water perturbation in filters, strengthens reaerationon in the column, destroys the anoxic section filters in the column. It is disadvantageous to the denitrification and the total nitrogen removal.