Oxygenic photogranules have been suggested as alternatives to activated sludge in wastewater treatment. Challenging for modeling photogranule‐based processes is the heterogeneity of photogranule morphologies, resulting in different activities by photogranule type. The measurement of microscale‐activities of filamentous photogranules is particularly difficult because of their labile interfaces. We present here an experimental and modeling approach to quantify phototrophic O₂ production, heterotrophic O₂ consumption, and O₂ diffusion in filamentous photogranules. We used planar optodes for the acquisition of spatio‐temporal oxygen distributions combined with two‐dimensional mathematical modeling. Light penetration into the photogranule was the factor controlling photogranule activities. The spatial distribution of heterotrophs and phototrophs had less impact. The photosynthetic response of filaments to light was detectable within seconds, emphasizing the need to analyze dynamics of light exposure of individual photogranules in photobioreactors. Studying other recurring photogranule morphologies will eventually enable the description of photogranule‐based processes as the interplay of interacting photogranule populations.

中文翻译：

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绘制丝状含氧光粒的生物活性

已建议将含氧光粒剂作为废水处理中活性污泥的替代品。对基于光粒的过程建模的挑战是光粒形态的异质性，导致光粒类型的不同活动。由于它们的界面不稳定，测量丝状光颗粒的微尺度活性特别困难。我们在此展示了一种量化光养 O ₂生产、异养 O ₂消耗和 O ₂的实验和建模方法在丝状光粒中扩散。我们使用平面光极结合二维数学建模来获取时空氧分布。光穿透光粒是控制光粒活性的因素。异养生物和光养生物的空间分布影响较小。灯丝对光的光合作用反应可在几秒钟内检测到，这强调需要分析光生物反应器中单个光颗粒的曝光动力学。研究其他重复出现的光粒形态最终将使基于光粒的过程描述为相互作用的光粒种群的相互作用。