Microalgae biotechnology as a promising pathway to ecofriendly aquaculture: a state‐of‐the‐art review

Li, Huankai; Chen, Sihua; Liao, Kang; Lu, Qian

doi:10.1002/jctb.6624

Cited by 44 publications

(31 citation statements)

References 142 publications

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“…They also serve as active bio pumps that fix CO 2 levels and provide continuous oxygen to fish (Lu et al, 2019). Additionally, marine microalgae are known to promote fish growth because they supply antioxidants that can improve fish immunity and reduce morbidity, thereby preventing antibiotic abuse (Li et al, 2021).…”

Section: Cultivation Of Microalgae In Aquaculture Watermentioning

confidence: 99%

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

et al. 2021

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Third-generation biofuel produced from microalgae is a viable solution to global energy insecurity and climate change. Despite an annual current global algal biomass production of 38 million litres, commercialization confronts significant economic challenges. However, cost minimization strategies, particularly for microalgae cultivation, have largely been excluded from recent studies. Therefore, this review provides essential insights into the technologies and economics of cost minimization strategies for large-scale applications. Cultivation of microalgae through aquafarming, in wastewater, or for biogas upgrading, and co-production of value-added products (VAPs) such as photo-bioreactors, protein, astaxanthin, and exopolysaccharides can drastically reduce biodiesel production costs. For instance, the co-production of photo-bioreactors and astaxanthin can reduce the cost of biodiesel production from $3.90 to $0.54 per litre. Though many technical challenges need to be addressed, the economic analysis reveals that incorporating such cost-effective strategies can make the biorefinery concept feasible and profitable. The cost of producing microalgal biodiesel can be lowered to $0.73kg−1 dry weight when cultivated in wastewater or $0.54L−1 when co-produced with VAPs. Most importantly, access to co-product markets with higher VAPs needs to be encouraged as the global market for microalgae-based VAPs is estimated to rise to $53.43 billion in 2026. Therefore, policies that incentivize research and development, as well as the production and consumption of microalgae-based biodiesel, are important to reduce the large gap in production cost that persists between biodiesel and petroleum diesel.

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Section: Cultivation Of Microalgae In Aquaculture Watermentioning

confidence: 99%

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

et al. 2021

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“…As shown in Figs 6(g–i), live algal cells with a green color were mixed with feed residue and fish feces. Thus, nutrients released from feed residue or fish feces could be captured and assimilated by microalgae in an efficient way 1,39 …”

Section: Resultsmentioning

confidence: 99%

“…Fresh microalgae, which mainly consist of live algal cells, could survive in the fish culture tank, continuously assimilating dissolved nutrients and maintaining ecological balance. As the dissolved nutrients are assimilated by algal cells and converted to algal biomass, microalgae can be harvested and recycled to be used as feed substitute 1 . As a consequence, the second weakness mentioned above in the discussion of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, due to the low utilization efficiency of feed and high cost of fish diet, aquaculture products may not have cost advantages over fishery products. To develop an eco‐friendly and low‐cost aquaculture, previous studies focused on water treatment technologies and feed substitutes 1,7 . Firstly, eutrophic water in an aquaculture system is treated by aeration, filtration or sedimentation and then recycled for fish rearing.…”

Section: Discussionmentioning

confidence: 99%

“…Aquaculture is an important industry providing people with high‐value protein and alleviating food security risks in many countries 1 . In some countries, aquaculture is developed to fill the gap between fishery production and market demand, thus mitigating the damage of overfishing to marine ecology.…”

Section: Introductionmentioning

confidence: 99%

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Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

Deng

Chen

Liao

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The discharge of food waste and eutrophication in aquaculture could cause environmental pollution and ecological disasters in the hydrosphere. Herein, a novel model of growing microalgae to recover nutrients from food waste and produce feed substitute for aquaculture is proposed. RESULTS: This study developed different methods to pretreat soybean fermentation effluent (SFE) and assessed the contribution of algal growth to nutrient recovery from SFE. Particularly, change of bacterial community was analyzed to explore the interaction between microalgae and bacteria in SFE remediation. In addition, the inclusion level of microalgae in fish diet was optimized and the effect of fresh microalgae on the aquaculture environment was studied. The results showed that unsterilized SFE with appropriate dilution is favorable for microalgal growth and biomass accumulation. Interaction between microalgae and acidogenic bacteria, including Prevotella sp., Acidaminococcus sp. and Lactobacillus sp., favored nutrient recovery from SFE. Removal efficiency of chemical oxygen demand, total nitrogen, total phosphorus and total ammonia‐nitrogen in SFE reached 95.66%, 35.35%, 57.70% and 42.21%, respectively. As the optimal inclusion level of microalgae in fish diet was set as 25%, body length and weight of Micropterus salmoides increased by 13.85 mm and 1.73 g in 44‐day culture. It was also found that fresh microalgae added in fish diet could effectively keep the ammonia concentration in aquaculture system at a lower level. CONCLUSION: The implementation of this model will be of importance to circular economies integrating food waste remediation and eco‐friendly aquaculture. © 2021 Society of Chemical Industry (SCI).

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Development of microalgal biofilm for wastewater remediation: from mechanism to practical application

Liao

et al. 2021

J of Chemical Tech & Biotech

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The high cost of biomass harvesting by centrifugation and high safety risks of collected algal biomass by chemical flocculation are serious problems jeopardizing the industrial implementation of microalgae bio-products. Recently, microalgae immobilization is regarded as a promising technology with the potential of lowering biomass production cost and ensuring biomass safety in the industry. Therefore, microalgal biofilms, an effective and affordable way to immobilize algal cells, are emerging into the limelight. This paper summarizes the progress achieved in biofilm system design and biofilm formation mechanisms. Newly designed algal biofilm systems are compared to demonstrate their advantages and weaknesses. Besides, mechanisms associated with the two steps -initial attachment of microalgae and biofilm thickeningof biofilm formation are discussed in this paper. Factors such as substratum material, algal strain and operational parameters, which could impact the formation and operation of algal biofilm, are demonstrated. Efforts devoted to the industrial application of algal biofilm to treat wastewater are discussed. The biotechnology of microalgal biofilm is currently at the critical stage of developing from fundamental research to industrial implementation. Undeniably, there are still many problems that limit the wide use of algal biofilm for biomass production and wastewater treatment. In this paper, we present some potential solutions to current problems and discuss the development trends of algal biofilm in the foreseeable future. It is expected that by addressing current problems microalgal biofilm will be widely used at the industrial scale.

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Microalgae biotechnology as a promising pathway to ecofriendly aquaculture: a state‐of‐the‐art review

Cited by 44 publications

References 142 publications

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

Development of microalgal biofilm for wastewater remediation: from mechanism to practical application

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