固定化微藻流化床反应器去除低碳污水中氨氮的潜力

以固定化微藻颗粒为原料，通过搭建流化床反应器强化微藻对氨氮（NH₄⁺-N）的去除，设计了藻种、污水上升流速、光周期和光照强度四组单一变量实验，系统地研究了不同条件下微藻去除NH₄⁺-N的能力.结果表明，当以固定化斜生栅藻为原料、污水上升流速为6.8m/h、光周期为8：16h和光照强度为4800Lux时，NH₄⁺-N去除效果最优（96.7%）.在最优操作条件下，探究了COD为200mg/L时微藻去除NH₄⁺-N的潜力，结果表明，当NH₄⁺-N初始浓度不高于50mg/L时，NH₄⁺-N去除率高于95%.本实验建立了一套半连续微藻流化床实验方法，该方法显著减弱了微藻在生物同化过程中对有机碳源的依赖性，为低COD条件下微藻生物脱氮工艺的设计提供了技术参考和理论基础.

The potential of immobilized microalgae fluidized bed reactor for removing ammonium from low carbon wastewater

A fluidized bed reactor was designed to enhance the removal efficiency of ammonium (NH₄⁺-N) by immobilized microalgae. Influences of different operating conditions of this system on NH₄⁺-N removal efficiency were investigated systematically, including microalgae species, sewage up-flow velocity, photo period and light intensity. Results indicated that a highest NH₄⁺-N removal (96.7%) efficiency was achieved by employing immobilized Scenedesmus obliquus at 6.8m/h influence velocity, 8:16h L/D photoperiod and 4800Lux light intensity. Based on these optimum operation conditions, ammonium removal potential of microalgae was studied at 200mg/L COD. Results showed that NH₄⁺-N removal rate is higher than 95% when the initial NH₄⁺-N concentration is no higher than 50mg/L. A semi-continuous methodology for microalgae fluidized bed reactor was established, which significantly reduced the dependence of microalgae on organic carbon source in the process of biological assimilation. The study provides a theoretical guidance for the design of microalgae fluidized bed technology, which could be used to improve the NH₄⁺-N removal potential from low carbon wastewater.