Marmara University, Faculty of Engineering, Environmental Engineering Department, Kuyubasi, 34726 Istanbul, Turkey.
Columbia University, Department of Earth and Environmental Engineering, New York, USA; Istanbul University, Cerrahpasa Faculty of Medicine, Fikret Biyal Central Research Laboratory, Istanbul, Turkey.
Sci Total Environ. 2019 Feb 15;651(Pt 2):3023-3033. doi: 10.1016/j.scitotenv.2018.09.140. Epub 2018 Sep 25.
Although Anammox process is a proven technology for sidestream nitrogen removal, the process faces challenges for mainstream applications in sewage treatment plants (STPs). The aim of this study was to investigate the effect of zero valent iron nanoparticles (nZVI) on process performance to eliminate confronts for mainstream applications. An SBR (sequencing batch reactor) system was fed with various nZVI concentrations (0.04-5000 ppb) within 310 days of operation. Ammonium (NH-N) and nitrite (NO-N) removal rates showed 58% increase in daily measurements and 73% increase in instant measurements. Specific Anammox Activity (SAA) was noticeably higher on the days the system was exposed to nZVI compared to the unexposed days. EPS secretion, which enhances granulation of Anammox bacteria was favored by nZVI. Despite lower sludge retention time (SRT) values, the fraction of Anammox bacteria in total bacteria reached to 91-92% implying a boosting effect of nZVI on growth rate of Anammox bacteria. High Resolution Melting (HRM) analyses showed that four distinct clades were present in the reactor.
尽管 Anammox 工艺是一种经过验证的侧流氮去除技术，但该工艺在污水处理厂（STP）的主流应用中仍面临挑战。本研究旨在探讨零价铁纳米颗粒（nZVI）对工艺性能的影响，以消除主流应用中的难题。在 310 天的运行中，SBR（序批式反应器）系统中加入了不同浓度的 nZVI（0.04-5000 ppb）。氨（NH-N）和亚硝酸盐（NO-N）的去除率在日测量和即时测量中分别提高了 58%和 73%。与未暴露的日子相比，系统暴露于 nZVI 时的特定 Anammox 活性（SAA）明显更高。EPS 分泌促进了 Anammox 细菌的颗粒化，nZVI 有利于其分泌。尽管污泥停留时间（SRT）值较低，但 Anammox 细菌在总细菌中的比例达到 91-92%，这表明 nZVI 对 Anammox 细菌的生长速度有促进作用。高分辨率熔解（HRM）分析表明，反应器中存在四个不同的进化枝。
