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CO2 sequestration with a hybrid Algae Oyster IMTA system

January 22, 2018

Rough Draft


Many Algae CO2 sequestration systems have been proposed as well as many algae biofuel production systems, all of them fail at the point of energy conversion study.The cost of energy to dewater algae to harvest fuel or food is very high so the thought here is that we would not dewater the algae at all but utilize oysters to filter feed the algae on a vast industrial scale.To prevent disease a large industrial algae CO2 sequestration plant would need many segregated feed streams and different variety of organism to preclude a shutdown due to disease.

The shells would uptake the Algae that consumed the CO2 and in turn sequestered in the Oyster shells as calcium carbonate, we would seek to landfill the shells or sequester them in some form at least for 5 to 10 thousand years as a buffer to allow geological forces to sequester the CO2 from the atmosphere

Question? does the Oyster sequester atmospheric CO2 for its shell or does it metabolize it from the Algae? Does it release CO2 from the Algae?

Our plan would be to increase sustainable seashell aquaculture to sequester 10% of the worlds CO2 production after accounting for energy consumed in the sequester process.

let’s have some fun!

How may Oyster shells represent 15% of an average Americans CO2 production? I think  20 metric tons per year is the number lets go with say 4 metric tons of oyster shells put away in a landfill

4 metric tons / 365 days per year could yield 0.0109589041 metric tons per day or 24 pounds of shells

The above website suggests that eating 3 pounds of Oysters a day would give me these  24 pounds of shells 🙂

could you eat that many? here are some papers on Oyster shell weights Moles


Moles of CO2 + Ca =   CaCO3


World prices per metric ton of oyster shells

$300 per metric ton of oyster shell from China but you want to buy local shells for a low carbon footprint

CO2 in Carbon tax schemes put a price on emissions per ton so we need to compute the value of oyster shell per ton

I think calcium carbonate is Half CO2** so this is $600 carbon tax delivered by oyster 🙂 Or is $150 per ton of Co2 ,but fear not we ate those oysters first did we not? But now we are back to eating 6 pounds per day per person so we need to downshift our personal sequestering of carbon or you could buy local shells on an Oyster shell carbon market




“And thus 1 equiv of calcium carbonate decomposes with heat to give 1 equiv of calcium oxide, and 1 equiv of carbon dioxide.”



This article discusses utilizing the oyster shells however many of the ideas here do not sequester CO2, even the reefs of discarded shells might not sequester past several centuries(?) Shells buried by easteuries or behind dams might do better plus provide that ecological services

This plan must be local!

New York City is using Oyster along with IMTA seaweed for bioremediation of the water column and indirectly sediments so we could set up a three-part Oster shell economy.(A)(1) part one would be New York purchases all restaurant shells at a set rate say $150 per metric ton regardless where the restaurant bought them from(A)(2) New York pays $300 per ton of Bioremediation Oyster shells from non edible oysters from New York City waters(A)(3) New York pays $400 per metric ton for shells from edible oysters only  if they are grown with a IMTA system IE seaweed cooproduction and are from city waters.



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