National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China.
Chemosphere. 2021 Dec;285:131443. doi: 10.1016/j.chemosphere.2021.131443. Epub 2021 Jul 6.
A novel simultaneous partial nitrification, endogenous denitrification and phosphorus removal (SPNEDpr) system was operated for 213 days in a sequencing batch reactor to treat real domestic sewage. The nutrient removal was achieved under an operation mode of intermittent aeration at unequal intervals with low oxygen concentrations. Through optimizing intermittent aeration conditions, the removal efficiencies of total inorganic nitrogen (TIN), POP and chemical oxygen demand (COD) reached 78.40%, 98.13% and 84%, respectively. Low-oxygen (0.1-0.7 mg/L) and intermittent aeration effectively inhibited nitrite oxidation bacteria (NOB), maintaining stable partial nitrification with nitrite accumulation ratio of 96.45%. Notably, intermittent aeration promoted the formation of aerobic granular sludge, with the sludge particle size increasing from 217.2 ± 5.3 to 351.8 ± 4.8 μm, thereby enhancing the TIN loss efficiency (81.3%). The predominant genus was Candidatus_Competibacter (11.6%), which stored COD as intracellular carbon source and performed the endogenous denitrification. The SPNEDpr process provided a highly efficient and economical method for treating urban sewage.
采用序批式反应器，通过 213 天的运行，成功构建了同步短程硝化-反硝化除磷（SPNEDpr）系统，以处理实际生活污水。该系统采用低氧浓度非等时曝气的运行模式，实现了脱氮除磷。通过优化间歇曝气条件，系统对总无机氮（TIN）、总磷（POP）和化学需氧量（COD）的去除率分别达到 78.40%、98.13%和 84%。低氧（0.1-0.7mg/L）和间歇曝气有效抑制了亚硝酸盐氧化菌（NOB）的生长，实现了稳定的短程硝化，亚硝酸盐积累率高达 96.45%。值得注意的是，间歇曝气促进了好氧颗粒污泥的形成，污泥粒径从 217.2±5.3μm 增加到 351.8±4.8μm，从而提高了 TIN 的去除效率（81.3%）。优势菌属为 Candidatus_Competibacter（11.6%），其将 COD 作为细胞内碳源进行储存，并实现了内源反硝化。该 SPNEDpr 工艺为处理城市污水提供了一种高效、经济的方法。
