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Use of the effluent from biogas production for cultivation of Spirulina

机译：利用沼气生产的螺旋藻进行养殖

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The effluent from the biogas process was tested as a nutrient source during cultivation of the protein-rich and edible microalgae Spirulina (Arthrospira platensis) and compared with conventional Spirulina medium. Equal biomass production was observed until late exponential phase and no significant differences could be observed between the treatments in protein amount, amino acid composition, and total lipid concentration. The concentration of the pigment phycocyanin differed significantly between Spirulina medium and the effluent-based medium (63.3 +/- 11.7 and 86.2 +/- 1.9 mg g(-1), respectively). Slightly higher concentrations of saturated fatty acids, mainly palmitic acid, were observed in the biomass produced in Spirulina medium than in that produced in the effluent-based medium. In the biomass produced in the effluent-based medium, the cadmium concentration was 0.07 +/- 0.05 mg kg(-1) of dry weight, whereas it was below the detection limit in the biomass produced in Spirulina medium. There is a need to identify new food and feed resources and a possible future scenario is to integrate Spirulina production into the biogas plant for protein production as it contains more than 60% of protein on dry weight basis. In that scenario, it is important to control heavy metal concentrations in the biogas slurry fed to Spirulina.
机译：在培养富含蛋白质和可食用的微藻螺旋藻（Arthrospira platensis）的过程中，测试了沼气工艺产生的废水作为营养源，并将其与常规螺旋藻培养基进行了比较。观察到相等的生物量生产，直到指数后期，并且在蛋白质含量，氨基酸组成和总脂质浓度之间，处理之间没有显着差异。螺旋藻培养基和基于废水的培养基之间的色素藻蓝蛋白浓度差异显着（分别为63.3 +/- 11.7和86.2 +/- 1.9 mg g（-1））。螺旋藻培养基中产生的生物质中的饱和脂肪酸（主要是棕榈酸）的浓度略高于废水基培养基中产生的饱和脂肪酸的浓度。在基于废水的培养基中产生的生物质中，镉浓度为干重的0.07 +/- 0.05 mg kg（-1），而低于在螺旋藻培养基中产生的生物质中的检测极限。有必要确定新的食物和饲料资源，未来可能的情况是将螺旋藻的生产整合到沼气厂进行蛋白质生产，因为螺旋藻的干重占蛋白质的60％以上。在这种情况下，控制送入螺旋藻的沼气浆中的重金属浓度非常重要。

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