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<p><i>Spirulina subsalsa</i> represents a promising candidate for commercial production. Yet, due to its unique pattern of attached growth followed by upward flotation, there is an urgent need to find a suitable cultivation strategy and achieve scale-up. In the low-cost medium of seawater plus monosodium glutamate wastewater, this study initially investigated the influence of aeration rate (0, 0.3, 0.6&#xa0;L/min) and reactor geometry (<i>D</i><sub><i>24</i></sub><i>d</i><sub><i>4.5</i></sub>, <i>D</i><sub><i>18</i></sub><i>d</i><sub><i>8</i></sub>, <i>D</i><sub><i>12</i></sub><i>d</i><sub><i>18</i>,</sub> <i>D</i>: diameter, cm; <i>d</i>: depth, cm) on microalgal growth, indicating that <i>Spirulina subsalsa</i> was suited for culturing in non-aerated, wide-shallow reactors. Then, in the single plastic reactor, diverse depths (2.25, 4.50, 9.00&#xa0;cm) and surface areas (1000, 2000, and 3000 cm<sup>2</sup>) for culturing <i>Spirulina subsalsa</i> were optimised to 4.5&#xa0;cm and 2000 cm<sup>2</sup>. Subsequently, a pilot-scale cultivation system with a volume of 162&#xa0;L was constructed, adopting a semi-continuous culture mode. The average dry mass productivity was 0.12&#xa0;g/L/d and 816.48&#xa0;g of algal powder was harvested within 41 days. The mean contents of protein, carbohydrate and lipid were respectively 46.50%, 14.95% and 10.87%. Moreover, economic analysis demonstrated that the cost of produced algal powder was 8.30 USD/kg. In the future, <i>Spirulina subsalsa</i> has the potential to be developed into multiple products.</p>

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Cultivation strategy optimization and pilot-scale production of Spirulina subsalsa grown in seawater and monosodium glutamate wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月31日

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  • Mingyan Liu,
  • Liqun Jiang,
  • Ze Yu,
  • Meng Ma,
  • Huiying Chen,
  • Haiyan Pei

摘要

Spirulina subsalsa represents a promising candidate for commercial production. Yet, due to its unique pattern of attached growth followed by upward flotation, there is an urgent need to find a suitable cultivation strategy and achieve scale-up. In the low-cost medium of seawater plus monosodium glutamate wastewater, this study initially investigated the influence of aeration rate (0, 0.3, 0.6 L/min) and reactor geometry (D24d4.5, D18d8, D12d18, D: diameter, cm; d: depth, cm) on microalgal growth, indicating that Spirulina subsalsa was suited for culturing in non-aerated, wide-shallow reactors. Then, in the single plastic reactor, diverse depths (2.25, 4.50, 9.00 cm) and surface areas (1000, 2000, and 3000 cm2) for culturing Spirulina subsalsa were optimised to 4.5 cm and 2000 cm2. Subsequently, a pilot-scale cultivation system with a volume of 162 L was constructed, adopting a semi-continuous culture mode. The average dry mass productivity was 0.12 g/L/d and 816.48 g of algal powder was harvested within 41 days. The mean contents of protein, carbohydrate and lipid were respectively 46.50%, 14.95% and 10.87%. Moreover, economic analysis demonstrated that the cost of produced algal powder was 8.30 USD/kg. In the future, Spirulina subsalsa has the potential to be developed into multiple products.