Recent advances in recirculating aquaculture systems and role of microalgae to close system loop - ScienceDirect

[Michael Hayes]

". Conclusions:

Cultivating microalgae presents a promising means of enhancing sustainability in RAS. By assimilating dissolved nutrients like nitrogen and phosphorus, algal metabolism can improve water quality, while oxygenation via photosynthesis further benefits the reared species. Un-coupled membrane photobioreactors enable controlled algae production, where biomass can be harvested and directly fed to cultured organisms or used for biorefinery. The suggested integrated RAS-microalgae platform could mitigate the environmental impacts through chemical remediation, axial carbon capture, and recycled bioconversion. However, continued innovations around the integrated bio-based treatment to balance economics and ethics are vital for actualizing sustainable RAS with value-added coproduction."

https://www.sciencedirect.com/science/article/pii/S0960852424008113 

MH] Agricultural in general is a leading GHG emitter, the enclosed microalgae photobioreactor-based form of agriculture is, however, a net GHG consumer. 

One may ask about the final storage of C as food, feed, fuel, fertilizer etc. eventually release their C to the atmosphere to some degree over various time frames. Yet, in the case of using microalgae as an ethylene producer, one can lock the C into durable, long lasting, polymers that can, in turn, be used to create more photobioreactors. As such, this represents a largely self-replicating mCDR infrastructure.

Most of the consumable products produced from the microalgae may have a short C storage time, yet the infrastructure itself represents a long lasting means of C storage that keeps on drawing down CO2.

[Bhaskar M V]

If Diatom Algae are grown in RAS it may not be necessary to harvest them.

Diatoms will be consumed by Zooplankton, such as Copepods, and these would be available for consumption by Shrimp and Fish.

Alternatively the Zooplankton can be harvested. 

Harvesting Zooplankton is easier than harvesting micro-algae, due to their larger size.

Regards

Bhaskar

[Michael Hayes]

Thank you for the clarification. Yet, value can be extracted at all levels of an integrated multitrophic aquacultural system.

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