Abstract

The chemical composition of inland desalination concentrate (DC) contains several microelements necessary for metabolism in microalgae. This study investigated the biomass concentration and biochemical composition of Spirulina platensis cultivated in DC under indoor (laboratory) and outdoor (raceway ponds) units. Initially, S. platensis was cultivated indoor testing different concentrations 0-, 20-, 40-, 60-, 80-, 100-% of DC, and results showed that mixing 60% DC with 40% Paoletti Synthetic Medium (PSM) is a suitable medium for S. platensis. After that, the optimum 60% DC to cultivate S. platensis under outdoor raceway pond was utilized. In parallel, a control assay using 100% PSM constituents was performed. S. platensis cultured in optimum DC, under outdoor conditions, exhibited biomass productivity (~ 10 g m⁻² day⁻¹) and protein content (45.0%) comparable to literature data. In addition, S. platensis cultivated in optimum DC was also able to synthesize carbohydrates, amino acids, fatty acids, and phycocyanin, which could be potentially used as biofertilizer and supplement in animal and aquaculture feed. Our results demonstrated the valorization of brine management through S. platensis cultivation, which can be considered as a step forward of reducing freshwater and conventional nutrients for algal mass cultivation.

Graphic Abstract

中文翻译：

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使用内陆海水淡化浓缩液（DC）作为螺旋藻大量栽培的替代基质的可行性

摘要

内陆脱盐浓缩液（DC）的化学成分包含微藻代谢所需的几种微量元素。本研究调查了室内（实验室）和室外（跑道池塘）在直流电条件下种植的螺旋藻的生物量浓度和生化组成。最初，S。platensis在室内进行培养，以测试0％，20％，40％，60％，80％，100％DC的浓度，结果表明将60％DC与40％Paoletti合成培养基（PSM）混合是适合于中华S的培养基。此后，利用最佳的60％DC在室外水道池塘下种植S. platensis。平行地，进行了使用100％PSM成分的对照测定。在室外条件下在最佳DC中培养的S. platensis表现出的生物量生产力（〜10 g m ^-2 天^-1）和蛋白质含量（45.0％）可与文献数据相比。此外，在最佳直流电条件下培养的S. platensis还能够合成碳水化合物，氨基酸，脂肪酸和藻蓝蛋白，它们有可能被用作生物肥料和动物和水产养殖饲料的补充。我们的结果证明了通过S. platensis种植进行盐水管理的价值，这可以被认为是减少用于藻类大规模种植的淡水和常规养分的一步。

图形摘要