Nutrient removal and biomass production of marine microalgae cultured in recirculating aquaculture systems (RAS) water with low phosphate concentration

被引：9

作者：

Jakhwal, Parul ^{[1
]}

Daneshvar, Ehsan ^{[1
]}

Skalska, Kinga ^{[1
]}

Matsakas, Leonidas ^{[2
]}

Patel, Alok ^{[2
]}

Park, Yuri ^{[3
]}

Bhatnagar, Amit ^{[1
]}

机构：

[1] LUT Univ, LUT Sch Engn Sci, Dept Separat Sci, Sammonkatu 12, FI-50130 Mikkeli, Finland

[2] Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Div Chem Engn, Biochem Proc Engn, Lulea S-97187, Sweden

[3] Seoul Natl Univ Sci & Technol, Dept Environm Engn, Seoul 01811, South Korea

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2024年 / 358卷

基金：

英国自然环境研究理事会;

关键词：

Recirculating aquaculture water; Microalgae; Nitrate; Phosphate; Omega-3 fatty acid; WASTE-WATER; CHLORELLA-VULGARIS; PHOSPHORUS REMOVAL; NITROGEN REMOVAL; FATTY-ACIDS; NITRATE; GROWTH; FEED; SUPPLEMENTATION; ACCUMULATION;

D O I：

10.1016/j.jenvman.2024.120859

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study was conducted to investigate the feasibility of microalgal biomass production and nutrient removal from recirculating aquaculture systems (RAS) water (RASW) with low phosphate concentration. For this purpose, Nannochloropsis oculata, Pavlova gyrans, Tetraselmis suecica, Phaeodactylum tricornutum, and their consortium were cultivated in RASW and RASW supplemented with vitamins (+V). Among them, N. oculata showed the maximum biomass production of 0.4 g/L in RASW. Vitamins supplementation significantly increased the growth of T. suecica from 0.16 g/L in RASW to 0.33 g/L in RASW + V. Additionally, T. suecica showed the highest nitrate (NO3-N) removal efficiency of 80.88 +/- 2.08 % in RASW and 83.82 +/- 2.08 % in RASW + V. Accordingly, T. suecica was selected for scaling up study of microalgal cultivation in RASW and RASW supplemented with nitrate (RASW + N) in 4-L airlift photobioreactors. Nitrate supplementation enhanced the growth of T. suecica up to 2.2-fold (day 15). The fatty acid nutritional indices in T. suecica cultivated in RASW and RASW + N showed optimal polyunsaturated fatty acids (PUFAs)/saturated fatty acid (SFAs), omega-6 fatty acid (n-6)/omega-3 fatty acid (n-3), indices of atherogenicity (IA), and thrombogenicity (IT)). Overall, the findings of this study revealed that despite low phosphate concentration, marine microalgae can grow in RASW and relatively reduce the concentration of nitrate. Furthermore, the microalgal biomass cultivated in RASW consisting of pigments and optimal fatty acid nutritional profile can be used as fish feed, thus contributing to a circular bioeconomy.

引用

页数：10

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