Studying the Impact of Wall Shear Stress on the Development and Performance of Electrochemically Active Biofilms.

Studying the Impact of Wall Shear Stress on the Development and Performance of Electrochemically Active Biofilms.
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研究壁剪切应力对电化学活性生物膜的形成和性能的影响

DOI:
10.1002/cplu.202000544
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发表时间:
2020
期刊:
影响因子:
3.4
通讯作者:
Uwe Schröder
Uwe Schröder
中科院分区:
化学3区
文献类型:
--
作者:
Christopher Moß;Niklas Jarmatz;Dave Hartig;Lukas Schnöing;Stephan Scholl;Uwe Schröder

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设计了层流反应器,为电活性细菌(EAB)的生物电化学观察提供恒定且可重复的生长条件。使用四个平行反应器进行实验,以比较不同流体动力学条件下的 EAB 生长行为和生物电化学性能,同时保持相同的生物条件。针对废水处理应用中的中等流量条件,将壁剪切应力调整至 0.4 mPa 至 2.9 mPa 的范围。计时电流数据表明,通过适度增加壁剪切应力可以改善早期电流密度。以同样的方式,当前的起始时间稍微增加到所施加的壁剪切应力的更高值。对 EAB 性能的长期观察表明,电流密度有所下降,并且生物膜生长早期阶段观察到的趋势趋于平稳。
A laminar flow reactor was designed that provides constant and reproducible growth conditions for the bioelectrochemical observation of electroactive bacteria (EAB). Experiments were performed using four reactors in parallel to enable the comparison of EAB growth behavior and bioelectrochemical performance under different hydrodynamic conditions while simultaneously keeping biological conditions identical. With regard to the moderate flow conditions found in wastewater treatment applications, the wall shear stress was adjusted to a range between 0.4 mPa to 2.9 mPa. Chronoamperometric data indicate that early stage current densities are improved by a moderate increase of the wall shear stress. In the same way, current onset times were increasing slightly towards higher values of the applied wall shear stress. Long‐term observations of EAB performance showed a decrease in current density and a leveling of the trend observed for the early stages of biofilm growth.
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