Cultivation of seaweeds in food production process waters: Evaluation of growth and crude protein content

Stedt, Kristoffer; Trigo, João P.; Steinhagen, Sophie; Nylund, Göran M.; Forghani, Bita; Pavia, Henrik; Undeland, Ingrid

doi:10.1016/j.algal.2022.102647

Cited by 26 publications

(17 citation statements)

References 47 publications

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“…The process waters included: (i) tub water (TUB) from in-house pre-processing storage of whole herring in 3% NaCl at a primary processor (Sweden Pelagic AB, Ellös, Sweden), and (ii) saturated salt brine (SAL) from maturation of herring fillets at a secondary processor (Klädesholmen Seafood AB, Rönnäng, Sweden). A detailed explanation of the HPPWs has been described by Stedt et al (2022b). After collection, the waters were filtered to remove coarse particles (> 300 mm) and stored at -60°C.…”

Section: Herring Production Process Watersmentioning

confidence: 99%

“…Recently, we found that Ulva fenestrata Postels & Ruprecht increases both its growth and crude protein content when cultivated in a wide variety of food production process waters (e.g. from shrimp, herring, and oatmilk production) (Stedt et al, 2022b), and there is a great potential to cultivate U. fenestrata with many different kinds of nutrient rich waters (Arumugam et al, 2018;Stedt et al, 2022a).…”

Section: Introductionmentioning

confidence: 99%

“…Our goal in this study was twofold, firstly we wanted to assess if the increased growth and crude protein content of U. fenestrata cultivated in two herring production process waters (HPPWs) that we previously reported (Stedt et al, 2022b) were maintained when the cultivation setting was up-scaled. Secondly, we wanted to establish if U. fenestrata cultivated in these two HPPWs can become a nutritionally sound and safe protein source for the future.…”

Section: Introductionmentioning

confidence: 99%

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Cultivation of Ulva fenestrata using herring production process waters increases biomass yield and protein content

et al. 2022

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Ulva spp. (sea lettuce) has recently gained attention as a sustainable protein source due to its high productivity and many nutritional properties interesting for the food industry. In this study, we explored a possible industrial symbiosis between herring production processing industries and Ulva fenestrata cultivation. We show that U. fenestrata cultivated in herring production process waters had four to six times higher biomass yields (27.17 - 37.07 g fresh weight vs. 6.18 g fresh weight) and three times higher crude protein content (> 30% dry weight vs. 10% dry weight) compared to U. fenestrata cultivated in seawater. Along with the elevation of protein, the herring production process waters also significantly increased levels of all essential amino acids in the seaweed biomass. The content of some heavy metals (arsenic, mercury, lead, and cadmium) was well below the maximum allowed levels in foodstuff. Therefore, quantities of biomass around 100 g dry weight could be consumed daily following the US Environmental Protection Agency’s reference doses. Combined, the results show that cultivation of U. fenestrata in herring production process waters has great potential to produce sustainable proteins for the growing world population. At the same time, nutrients of currently discarded process waters are circulated back to the food chain.

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Section: Herring Production Process Watersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cultivation of Ulva fenestrata using herring production process waters increases biomass yield and protein content

et al. 2022

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“…Wastewater rich in ammonium is then a promising source for algal cultivation. Algae that grow in N-rich wastewater had 4 times higher crude protein content when compared to seawater controls [25]. N-replete culture can lead to algae accumulating N-containing photosynthetic pigments such as chlorophyll, thus obtaining a darker and more vibrant green colour at the end of growth.…”

Section: Algae Mechanisms To Uptake Nutrientsmentioning

confidence: 95%

“…This is partly due to the nitrogen to ] phosphorous (N/P) ratio in wastewaters, which plays a critical role in ensuring an effective and simultaneous uptake of nutrients and biomass growth in algae species [15••]. The suitable ratio of N and P for macroalgae growth is between 10 N:1P and 80 N:1P [25] with optimal ratio of 30 N:1P, while it is 5-30 N:1P for microalgae [26,27]. The optimal N/P ratio is strain-dependent; for example, it is reportedly 7 and 30 for Chlorella sp.…”

Section: Nutrient Uptakes Rate By Algaementioning

confidence: 99%

Nutrient Removal by Algae-Based Wastewater Treatment

Nguyen

Aditya

et al. 2022

Curr Pollution Rep

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Algae cultivation complements wastewater treatment (WWT) principles as the process uptakes nutrients while assimilates CO2 into biomass. Thus, the application of algae-based WWT is on the upward trajectory as more attention for recovery nutrients and CO2 capture while reducing its economic challenge in the circular economy concept. However, the complexity of wastewater and algal ecological characteristics induces techno-economic challenges for industry implementation. Algae-based WWT relies totally on the ability of algae to uptake and store nutrients in the biomass. Therefore, the removal efficiency is proportional to biomass productivity. This removal mechanism limits algae applications to low nutrient concentration wastewater. The hydraulic retention time (HRT) of algae-based WWT is significantly long (i.e. > 10 days), compared to a few hours in bacteria-based process. Phototrophic algae are the most used process in algae-based WWT studies as well as in pilot-scale trials. Application of phototrophic algae in wastewater faces challenges to supply CO2 and illumination. Collectively, significant landscape is required for illumination. Algae-based WWT has limited organic removals, which require pretreatment of wastewaters before flowing into the algal process. Algae-based WWT can be used in connection with the bacteria-based WWT to remove partial nutrients while capturing CO2. Future research should strive to achieve fast and high growth rate, strong environmental tolerance species, and simple downstream processing and high-value biomass. There is also a clear and urgent need for more systematic analysis of biomass for both carbon credit assessment and economic values to facilitate identification and prioritisation of barriers to lower the cost algae-based WWT. Graphical abstract

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Why Global Interest in Seaweed? Can Seaweed Conquer the World?

Čagalj,

Šimat

2024

Seaweeds and Seaweed-Derived Compounds

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Cultivation of seaweeds in food production process waters: Evaluation of growth and crude protein content

Cited by 26 publications

References 47 publications

Cultivation of Ulva fenestrata using herring production process waters increases biomass yield and protein content

Cultivation of Ulva fenestrata using herring production process waters increases biomass yield and protein content

Nutrient Removal by Algae-Based Wastewater Treatment

Why Global Interest in Seaweed? Can Seaweed Conquer the World?

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