城市污水H-A-O生物脱氮工艺研究

为同时去除城市污水中的有机物和氮,设计了水解-缺氧-好氧(H-A-O)生物脱氮处理工艺,建立了连续处理实验装置,并对该工艺进行了现场中试研究.结果表明:在总水力停留时间为7.5 h、硝化出水回流比为200%、无外加碳源和碱度、无污泥回流的条件下,有机物和总氮的去除率分别超过82%和65%;以水解取代传统的城市污水处理中初沉池,既可有效地改善污水的可生化性,又可增强污水处理系统运行的稳定性.

H-A-O process for bio-nitrogen removal from urban wastewater

The hydrolysis-anaerobic-oxidation process(H-A-O process) was designed to remove organic matters and nitrogen from urban wastewater simultaneously.The experimental equipment for continuous treatment of urban wastewater was set up and the pilot experiment was conducted.The result showed that,without external carbon sources,alkalinity,and backflow of sludge,the removal ratios of COD and TN were higher than 82% and 65%,respectively,under the condition that the hydraulic retention time was 7.5?h and the backflow ratio of nitrification was 200%.It is also demonstrated that the hydrolysis process replacing the primary sedimentation tank,a conventional method for urban wastewater treatment,can not only effectively improve the bio-degradability of wastewater,but also enhance the stability for the operation of the wastewater treatment system.