Microalgal-based wastewater treatment and CO₂ sequestration from flue gases with subsequent biomass production represent a low-cost, eco-friendly, and effective procedure of removing nutrients and other pollutants from wastewater and assists in the decrease of greenhouse gas emissions. Thus, it supports a circular economy model. This is based on the ability of microalgae to utilise inorganic nutrients, mainly nitrogen and phosphorous, as well as organic and inorganic carbon, for their growth, and simultaneously reduce these substances in the water. However, the production of microalgae biomass under outdoor cultivation is dependent on several abiotic and biotic factors, which impact its profitability and sustainability. Thus, this study’s goal was to evaluate the factors affecting the production of microalgae biomass on pilot-scale open raceway ponds under Northern Sweden’s summer conditions with the help of a mathematical model. For this purpose, a microalgae consortium and a monoculture of Chlorella vulgaris were used to inoculate outdoor open raceway ponds. In line with the literature, higher biomass concentrations and nutrient removals were observed in ponds inoculated with the microalgae consortium. Our model, based on Droop’s concept of macronutrient quotas inside the cell, corresponded well to the experimental data and, thus, can successfully be applied to predict biomass production, nitrogen uptake and storage, and dissolved oxygen production in microalgae consortia.

微藻基废水处理和CO ₂烟气中的固存以及随后的生物质生产代表了一种低成本，生态友好且有效的过程，可从废水中去除营养物和其他污染物，并有助于减少温室气体的排放。因此，它支持循环经济模型。这是基于微藻利用无机养分（主要是氮和磷以及有机和无机碳）生长并同时减少水中这些物质的能力。但是，在室外种植下生产微藻生物质取决于几种非生物和生物因素，这会影响其盈利能力和可持续性。因此，这项研究的目的是借助数学模型，评估影响瑞典北部夏季条件下的中型规模水道池塘微藻生物量生产的因素。为此，一个微藻财团和一个单一的养殖小球藻用于接种室外开放水道池塘。与文献一致，在接种了微藻群的池塘中观察到更高的生物量浓度和营养去除率。我们的模型基于Droop细胞内部大量营养素配额的概念，与实验数据非常吻合，因此可以成功地用于预测微藻群中生物量的产生，氮的吸收和储存以及溶解氧的产生。