Programa de Pós-Graduação em Tecnologias Ambientais(PGTA), Universidade Federal de Mato Grosso do Sul (UFMS), Faculdade de Engenharias, Arquitetura e Urbanismo e Geografia(FAENG), Av. Costa e Silva, s/n, Pioneiros, 79070-900 Campo Grande, MS, Brazil.
An Acad Bras Cienc. 2021 Apr 23;93(1):e20190084. doi: 10.1590/0001-3765202120190084. eCollection 2021.
This paper shows the influence of turbidity (in Nephelometric Turbidity Units - NTU), chemical oxygen demand (COD) and aeration (CO2 supply) on the productivity and growth rate and lipid content of microalgae (a mixed culture predominantly composed of Chlorella vulgaris), using anaerobically digested vinasse as a culture medium. The microalgae can be cultivated in anaerobically digested vinasse, at turbidity and chemical oxygen demand of 690 NTU and 2.5 gCOD L -1, respectively, according to the modified Gompertz model, and removal of turbidity by filtration did not influence the microalgae productivity (≈ 77 mg L1 d1). Furthermore, aeration increased the productivity up to 139 mg L1 d1, with a biomass dry weight of 2.7 g L-1. Finally, a maximum lipid content of 265 mg L -1 was obtained, while a nitrogen removal of 98% was recorded for all conditions. Thus, the combination of anaerobic digestion followed by the use of the digestate for the cultivation of microalgae may be an efficient way to treat large quantities of this residue, in turn yielding large amounts of microalgae biomass, which can be transformed into fertilizer and biofuel.
本文展示了浊度（以浊度单位表示）、化学需氧量（COD）和曝气（二氧化碳供应）对微藻（主要由普通小球藻组成的混合培养物）生产力、生长率和脂质含量的影响，使用厌氧消化酒糟作为培养基。根据修正的 Gompertz 模型，微藻可以在浊度和化学需氧量分别为 690 NTU 和 2.5 gCOD/L 的厌氧消化酒糟中培养，并且过滤去除浊度不会影响微藻生产力（≈77mg/L/d）。此外，曝气将生产力提高到 139mg/L/d，生物量干重达到 2.7g/L。最后，获得了 265mg/L 的最大脂质含量，同时在所有条件下都记录到了 98%的氮去除率。因此，厌氧消化后使用消化液来培养微藻可能是处理大量这种残渣的有效方法，从而产生大量的微藻生物质，可将其转化为肥料和生物燃料。
