Cyanobacterial wastewater-based biorefineries are a sustainable alternative to obtain high-value products with reduced costs. This study aimed to obtain phycobiliproteins and carotenoids, along with biogas from a wastewater-borne cyanobacterium grown in secondary effluent from an urban wastewater treatment plant, namely treated wastewater. For the first time, the presence of contaminants of emerging concern in concentrated pigment extracts was assessed. Tertiary wastewater treatment was conducted in a 3 L photobioreactor inoculated with Synechococcus sp., and operated in semi-continuous regime with a hydraulic retention time of 6 days. The carotenoid content was stable (reaching up to 4 mg gDW^-1) regardless of the wastewater composition, while the phycobiliprotein content (up to 214 mg gDW^-1) varied according to nitrogen availability. In concentrated pigment extracts, only 3 (out of 20) organic microcontaminants were detected. The biochemical methane potential of pigment-extracted biomass (222 NL CH₄ kg⁻¹) was still 72% of raw biomass. In conclusion, a cyanobacteria culture rich in Synechococcus sp. appears as a promising source of bio-based products in a circular economy approach.

中文翻译：

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从处理过的废水中生长的蓝藻中回收天然色素和沼气。有机微污染物的命运。


基于蓝藻废水的生物精炼厂是一种可持续的替代方案，可以降低成本获得高价值产品。本研究旨在从城市污水处理厂二次流出物中生长的废水传播的蓝藻（即处理后的废水）中获得藻胆蛋白和类胡萝卜素以及沼气。首次评估了浓缩色素提取物中新出现的污染物的存在。在接种了聚球藻属的 3 L 光生物反应器中进行三次废水处理，并以半连续状态运行，水力保留时间为 6 天。无论废水成分如何，类胡萝卜素含量都是稳定的（高达 4 mg ^gDW-1），而藻胆蛋白含量（高达 214 mg ^gDW-1）根据氮的可用性而变化。在浓缩色素提取物中，仅检测到 3 种（20 种）有机微量污染物。色素提取的生物质 （222 NL CH₄ ^kg-1） 的生化甲烷潜力仍为原始生物量的 72%。总之，在循环经济方法中，富含聚球藻属的蓝藻培养物似乎是生物基产品的有前途的来源。