Bioscience and Territory Department, University of Molise, C. da Fonte Lappone, 86090, Pesche, (IS), Italy.
INRAE, Univ. Montpellier, LBE, 102 Avenue des Etangs, 11100, Narbonne, France.
Environ Res. 2021 Aug;199:111359. doi: 10.1016/j.envres.2021.111359. Epub 2021 May 20.
Cyanobacteria and microalgae are considered as interesting feedstocks for either the production of high value bio-based compounds and biofuels or wastewater treatment. Nevertheless, the high costs of production, mainly due to the harvesting process, hamper a wide commercialization of industrial cyanobacteria and microalgae based products. Recent studies have found in autoflocculation and bioflocculation promising spontaneous processes for a low-cost and environmentally sustainable cyanobacteria and microalgae biomass harvesting process. In the present work, bioflocculation process has been studied for three different inocula: filamentous cyanobacteria, microalgae and their mixture. Their cultivation has been conducted in batch mode using two different cultivation media: synthetic aqueous solution and urban wastewater. The removal of nutrients and flocculation process performance were monitored during the entire cultivation time. Results have proved that bioflocculation and sedimentation processes occur efficiently for filamentous cyanobacteria cultivated in synthetic aqueous solution, whereas such processes are less efficient in urban wastewater due to the specific characteristics of this medium that prevent bioflocculation to occur. Besides different efficiencies associated to cultivation media, this work highlighted that bioflocculation of sole microalgae is not as effective as when they are cultivated together with filamentous cyanobacteria.
蓝藻和微藻被认为是很有前途的原料，可以用来生产高附加值的生物基化合物和生物燃料，或者用来处理废水。然而，由于生产成本高，主要是由于收获过程的原因，限制了工业规模的蓝藻和微藻产品的广泛商业化。最近的研究发现，在自絮凝和生物絮凝方面，有一些很有前途的自发过程，可以用于低成本和环境可持续的蓝藻和微藻生物质收获过程。在本工作中，研究了三种不同接种物的生物絮凝过程：丝状蓝藻、微藻及其混合物。使用两种不同的培养介质：合成水溶液和城市废水，以分批模式培养它们。在整个培养过程中监测营养物质的去除和絮凝过程的性能。结果表明，在合成水溶液中培养的丝状蓝藻可以有效地进行生物絮凝和沉淀过程，而在城市废水中，由于该介质的特殊性质会阻止生物絮凝的发生，因此这些过程的效率较低。除了与培养介质相关的不同效率外，这项工作还强调了单独培养微藻的生物絮凝效果不如将它们与丝状蓝藻一起培养时的效果好。
