Microalgae performance of outdoor cultivation systems is influenced by environmental and operating dynamics. Monitoring and control systems are needed to maximise biomass productivity and nutrient recovery. The goal of this work was to corroborate that pH data could be used to monitor microalgae performance by means of data from an outdoor membrane photobioreactor (MPBR) plant. In this system, microalgae photosynthetic activity was favoured over other physical and biological processes, so that the pH data dynamics was theoretically related to the microalgae carbon uptake rate (CUR). Short- and long-term continuous operations were tested to corroborate the relationship between the first derivate of pH data dynamics (pH') and microalgae photosynthetic activity. Short-term operations showed a good correlation between gross pH' values and MPBR performance. An indicator of the maximum daily average microalgae activity was assessed by a combination of on-line pH' measurements obtained in the long-term and a microalgae growth kinetic model. Both indicators contributed to the development of advanced real-time monitoring and control systems to optimise microalgae cultivation technology.

中文翻译：

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根据pH数据在线监测光合作用，以评估微藻的培养。

室外栽培系统的微藻性能受环境和运行动力学的影响。需要监测和控制系统以最大化生物量生产力和养分回收。这项工作的目的是通过室外膜光生物反应器（MPBR）的数据来证实pH数据可用于监测微藻的性能。在该系统中，微藻的光合作用活性优于其他物理和生物过程，因此，pH数据动力学理论上与微藻碳吸收率（CUR）相关。测试了短期和长期连续操作，以证实pH数据动力学（pH'）的一阶导数与微藻光合活性之间的关系。短期操作显示总pH'之间有很好的相关性 值和MPBR性能。通过长期获得的在线pH'测量值和微藻生长动力学模型的组合来评估最大日平均微藻活性的指标。两项指标均有助于开发先进的实时监控系统，以优化微藻栽培技术。