Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, China.
Bioresour Technol. 2012 Nov;123:375-81. doi: 10.1016/j.biortech.2012.07.080. Epub 2012 Jul 27.
Two anoxic/oxic sequencing batch reactors (A/O SBRs) were operated to investigate the effects of step-feed on granulation processes and performances of partial nitrifying granules (PNG). R1 was operated in a traditional single-feed mode, while a two-step-feed strategy was used in R2. Results showed that R1 had a faster granulation process and better performance in maintaining partial nitrification compared with R2, indicating that the step-feed mode had a negative effect of on formation of PNG. However, after full granulation, PNG in both reactors had similar properties in terms of suspended solids (MLSS), sludge volume index (SVI) and granule size. Moreover, mature granules in R2 had a higher nitrite accumulation rate than that in R1. Step-feed strategy was also observed to enhance denitrification and TN removal, as well as ammonia oxidation. It can be concluded that step-feed was unfavorable for cultivating PNG, but it significantly improved the nitrogen removal performance of PNG.
采用两段缺氧/好氧序批式反应器（A/O SBR），研究了分步进料对部分硝化颗粒（PNG）形成过程和性能的影响。R1 采用传统的单步进料方式，而 R2 则采用两步进料策略。结果表明，与 R2 相比，R1 具有更快的颗粒化过程和更好的部分硝化维持性能，表明分步进料模式对 PNG 的形成有负面影响。然而，在完全颗粒化后，两个反应器中的 PNG 在悬浮固体（MLSS）、污泥体积指数（SVI）和颗粒大小方面具有相似的性质。此外，R2 中的成熟颗粒的亚硝酸盐积累速率高于 R1。分步进料策略还观察到对反硝化和 TN 去除以及氨氧化有促进作用。可以得出结论，分步进料不利于培养 PNG，但显著提高了 PNG 的脱氮性能。
