Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden; Department of Environmental Science, Stockholm University, 106 91, Stockholm, Sweden.
Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87, Luleå, Sweden.
Chemosphere. 2021 Aug;276:130122. doi: 10.1016/j.chemosphere.2021.130122. Epub 2021 Mar 1.
Microalgal-based wastewater treatment and CO 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.
利用微藻从烟道气中进行废水处理和 CO2 捕集，随后生产生物质，这代表了一种从废水中去除营养物和其他污染物的低成本、环保且有效的方法，同时有助于减少温室气体排放。因此，它支持循环经济模式。这是基于微藻利用无机养分（主要是氮和磷）以及有机和无机碳来生长的能力，同时减少水中的这些物质。然而，在户外培养条件下生产微藻生物质取决于几个非生物和生物因素，这会影响其盈利性和可持续性。因此，本研究的目的是借助数学模型，评估在瑞典北部夏季条件下，利用试验规模开放式养殖槽生产微藻生物质的各种因素。为此，使用微藻共生体和普通小球藻的单培养物来接种户外开放式养殖槽。与文献一致，在接种微藻共生体的池塘中观察到更高的生物质浓度和养分去除率。我们的模型基于 Droop 提出的细胞内宏量营养素配额概念，与实验数据吻合较好，因此可以成功应用于预测微藻共生体的生物质生产、氮吸收和储存以及溶解氧产生。
