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首页> 外文期刊>Biodegradation >Mechanical shear contributes to granule formation resulting in quick start-up and stability of a hybrid anammox reactor
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Mechanical shear contributes to granule formation resulting in quick start-up and stability of a hybrid anammox reactor

机译：机械剪切有助于颗粒形成，从而导致混合厌氧氨氧化反应器的快速启动和稳定性

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It appears that if suspended biomass washout can be reduced effectively, granule formation will be fastened in fluidized bed. Quicker reactor start-up can be anticipated especially for those system keeping slow growth bacteria such as anammox. A hybrid reactor combined fixed-bed with nonwoven fabrics as biomass carrier and fluidized bed with slow speed mechanical stirring was therefore developed, and its nitrogen removal performances was evaluated experimentally. Only in 38 days, the total nitrogen removal rate (NRR) reached to 1.9 kg(N) m(-3) day(-1) and then doubled within 17 days, with total nitrogen removal efficiency kept above 70%. After 180 days reactor operating, the NRR reached a maximum value of 6.6 kg(N) m(-3) day(-1) and the specific anammox activity was gradually constant in 0.32 kg(N) kg(VSS)(-1) day(-1). Biomass attached on nonwoven fabrics could additionally improve reactor nitrogen removal by 8%. The dominant size of granular sludge reached to 0.78 mm with stirring speed adjusted from 30 to 80 rpm and the hydraulic retention time (HRT) from 8 to 1.5 h during the whole operating time. Scanning electron microscope observation showed especially compact structure of granular sludge. A 70% of anammox bacteria percentage was identified by fluorescence in situ hybridization analysis.
机译：看来，如果可以有效地减少悬浮的生物质冲刷，颗粒的形成将被固定在流化床中。可以预料到反应器将更快启动，尤其是对于那些保持缓慢生长的细菌（例如厌氧氨氧化菌）的系统而言。因此，开发了一种混合床反应器，该床结合了固定床和无纺布作为生物质载体，并在慢速机械搅拌下流化床，并通过实验评估了其脱氮性能。仅在38天内，总氮去除率（NRR）达到1.9 kg（N）m（-3）天（-1），然后在17天内翻了一番，总氮去除率保持在70％以上。反应堆运行180天后，NRR达到最大值6.6 kg（N）m（-3）天（-1），并且特定的厌氧氨氧化活性逐渐恒定在0.32 kg（N）kg（VSS）（-1）中天（-1）。附着在非织造织物上的生物质还可以将反应堆的氮去除率提高8％。在整个操作过程中，搅拌速度从30到80 rpm调整，水力停留时间（HRT）从8到1.5 h，颗粒状污泥的主要尺寸达到0.78 mm。扫描电子显微镜观察显示颗粒污泥的结构特别紧凑。通过荧光原位杂交分析鉴定出70％的厌氧菌百分比。

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