Federal University of Viçosa (Universidade Federal de Viçosa/UFV), Department of Civil Engineering, Advanced Environmental Research Group - nPA, Av. Peter Henry Rolfs, s/n, Campus Universitário, Viçosa, Minas Gerais 36570-900, Brazil.
Federal University of Viçosa (Universidade Federal de Viçosa/UFV), Department of Civil Engineering, Advanced Environmental Research Group - nPA, Av. Peter Henry Rolfs, s/n, Campus Universitário, Viçosa, Minas Gerais 36570-900, Brazil.
Sci Total Environ. 2022 Aug 15;834:155282. doi: 10.1016/j.scitotenv.2022.155282. Epub 2022 Apr 18.
Microalgae-based treatment can be applied to the bioremediation of agro-industrial wastewater, aiming at a circular economy approach. The present work compared the technical-environmental feasibility of operating a bubble column photobioreactor (PBR) and a high rate pond (HRP) for microalgae biomass production and wastewater treatment of a meat processing facility. The comparison was made regarding biomass productivity, phytoplankton composition, treatment efficiency, life cycle assessment, and energy balance. The daily yields of total biomass and the maximum specific growth rates were 483.33 mg L d and 0.23 d for PBR and 95.00 mg L·d and 0.193 d for HRP, respectively, with a predominance of the species Scenedesmus acutus. The treatment efficiency of COD (~50%) and phosphorus (100%) were similar in the two reactors. However, the PBR showed greater assimilation of ammoniacal nitrogen (100% removal) due to the higher microalgal biomass productivity. Environmental impacts were assessed through the ReCiPe methodology for midpoint and endpoint levels. Results revealed that CO supply was the most impactful process for both systems (>60%), but HRP reached lower environmental burdens (-105.90 mPt) than PBR (60.74 mPt). Energy balance through the Net Energy Ratio also resulted in the HPR advantage over the PBR (NER = 14.23 and 1.09, respectively). Still, both reactors present advantages when applied to different valorization routes. At the same time, both present room for improvement in the light of bioeconomy and biorefineries, aiming at sustainable wastewater treatment plants.
基于微藻的处理方法可应用于农业工业废水的生物修复，旨在实现循环经济。本研究比较了在肉类加工设施中使用气升式光生物反应器（PBR）和高速率池塘（HRP）进行微藻生物量生产和废水处理的技术-环境可行性。比较了生物量生产率、浮游植物组成、处理效率、生命周期评估和能量平衡。PBR 的总生物质日产量和最大比生长速率分别为 483.33 mg L d 和 0.23 d，而 HRP 分别为 95.00 mg L·d 和 0.193 d，优势种为 Scenedesmus acutus。两个反应器对 COD（~50%）和磷（100%）的处理效率相似。然而，由于微藻生物量生产率较高，PBR 对氨氮的同化效率更高（100%去除）。通过 ReCiPe 方法对中点和终点水平进行了环境影响评估。结果表明，CO 供应是两个系统中最具影响力的过程（>60%），但 HRP 达到的环境负担（-105.90 mPt）低于 PBR（60.74 mPt）。通过净能源比进行的能量平衡也表明 HRP 优于 PBR（NER = 14.23 和 1.09）。尽管如此，当应用于不同的增值途径时，两个反应器都具有优势。同时，考虑到生物经济和生物精炼厂，两者都有改进的空间，旨在建立可持续的污水处理厂。
