deefone wrote:If your interest is to harvest wild algal I would question first--
1. What is the lipid content? Is it toxic?
2. Wild can overcome any other possible species and infect or pollute your system.
3. If a decent percentage of lipids are found then you may have a possibility.
4. Growth rate, CO2 additive and feedstock should be tested.
5. UV exposure- if possible, the color spectrum could be compared in a closed environment.
6. Work with your local University. If you have gone this far with possible results, we all would like to hear from your results.
7. With over 300,000 species possible, including some toxic, we have a long way to go.
8. It's possible your local alga could be commercially grown but nowhere else.
9. Just don't give up- the answer is out there---most of all stay informed.
DR Johansen wrote:I have been interested in the supercritical CO2 extraction method. If you want to get into volume production, that may be the best way. I THINK it can be used even with wet algae.
As an experiment, perhaps you should try finding a dry cleaner in your area that uses the CO2 method and arrange to "dry clean" a couple 10s or 100s of kg of your algae and see what comes out the sludge line.
Best of luck.
And I thank you for the acedemic promotion, though I haven't earnd it. Its DR as in initials, not Dr. as in PhD.dunebilly wrote: Thankyou for your reply Doctor.
Only to the extent that you took it out to begin with. The process does not GENERATE CO2, it just uses recycled CO2, removing it from the atmosphere in the first place.dunebilly wrote: Sorry it took me so long to find it. Would your suggested method cause CO2 to be released into the atmosphere?
There should be no more concern about SC CO2 than about biofuels. Both processes remove CO2 from the atmosphere and the after using it for a while, puts it back. Both are CO2 neutral.dunebilly wrote: I see there is much more information about expellers now than last year. I had asumed an expeller would not be effecient as they were designed for pressing seeds. The idea of processing wet has great merit, but not if it requires release of CO2. There is an excess of waste heat available on the harvesting vessel anyway, but obviously dryers and heat exchangers add to mechanical complexity, delay implementation and add to risk of enterprise failure.
Meanwhile, if anyone knows of a commercaily sized process to extract oil from algae, please post. Thankyou.
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