Department of Civil Engineering, Ottawa-Carleton Institute for Environmental Engineering, University of Ottawa, Ottawa, Canada.
Department of Chemical and Biological Engineering, Ottawa-Carleton Institute for Environmental Engineering, University of Ottawa, Ottawa, Canada.
Bioprocess Biosyst Eng. 2019 Nov;42(11):1809-1818. doi: 10.1007/s00449-019-02177-8. Epub 2019 Jul 26.
There is a need to develop low operational intensity, cost-effective, and small-footprint systems to treat wastewater. Partial nitritation has been studied using a variety of control strategies, however, a gap in passive operation is evident. This research investigates the use of elevated loading rates as a strategy for achieving low operational intensity partial nitritation in a moving bed biofilm reactor (MBBR) system. The effects of loading rates on nitrification kinetics and biofilm characteristics were determined at elevated, steady dissolved oxygen concentrations between 5.5 and 7.0 mg O/L and ambient temperatures between 19 and 21 °C. Four elevated loading rates (3, 4, 5 and 6.5 g NH-N/m days) were tested with a distinct shift in kinetics being observed towards nitritation at elevated loadings. Complete partial nitritation (100% nitrite production) was achieved at 6.5 g NH-N/m days, likely due to thick biofilm (572 µm) and elevated NH-N load, which resulted in suppression of nitrite oxidation.
需要开发低运行强度、具有成本效益且占地面积小的系统来处理废水。已经使用各种控制策略对部分亚硝化作用进行了研究，但是显然存在被动运行的差距。本研究调查了在移动床生物膜反应器 (MBBR) 系统中使用升高的负荷率作为实现低运行强度部分亚硝化的策略。在升高的、稳定的溶解氧浓度（5.5 至 7.0 mg O/L）和环境温度（19 至 21°C）下，确定了负荷率对硝化动力学和生物膜特性的影响。用四种升高的负荷率（3、4、5 和 6.5 g NH-N/m3 天）进行了测试，在升高的负荷下观察到动力学明显向亚硝化转变。在 6.5 g NH-N/m3 天的条件下实现了完全的部分亚硝化（100%亚硝酸盐生成），这可能是由于厚的生物膜（572 µm）和升高的 NH-N 负荷导致抑制了亚硝酸盐氧化。
