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首页> 外文期刊>Bioprocess and Biosystems Engineering >Partial nitritation at elevated loading rates: design curves and biofilm characteristics
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Partial nitritation at elevated loading rates: design curves and biofilm characteristics

机译：高负荷率下的部分硝化：设计曲线和生物膜特征

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摘要

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-2/L and ambient temperatures between 19 and 21 degrees C. Four elevated loading rates (3, 4, 5 and 6.5 g NH4+-N/m(2) 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 NH4+-N/m(2) days, likely due to thick biofilm (572 mu m) and elevated NH4+-N load, which resulted in suppression of nitrite oxidation.
机译：需要开发低操作强度，成本效益高且占地面积小的系统来处理废水。已经使用多种控制策略研究了部分亚硝化，但是，被动运行中存在明显的差距。这项研究调查了使用高负荷率作为在移动床生物膜反应器（MBBR）系统中实现低操作强度部分硝化的策略。在5.5和7.0 mg O-2 / L之间稳定的升高溶解氧浓度和19至21摄氏度的环境温度下，确定了负载速率对硝化动力学和生物膜特性的影响。四种升高的负载速率（3、4、5和6.5 g NH4 + -N / m（2）天）进行了测试，并观察到了在高负荷下向硝化反应的动力学变化。在6.5 g NH4 + -N / m（2）天时完成了部分亚硝化（100％亚硝酸盐生成），这可能是由于厚厚的生物膜（572μm）和较高的NH4 + -N负荷导致了亚硝酸盐氧化的抑制。

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