Macro-algae to ethanol

Re: Macro-algae to ethanol

Postby mathu » Mon Mar 02, 2009 10:21 am

[quote="Sagaa"]Hi all,
Interesting discussion here.... I want to know about the pretreatments required for macroalgae fermentation. I want to know the exact temperature and pH? Is it possible to get higher yield of ethanol by altering pH or temperature? Suggestions pls....[/quote]

I came across this link...

http://www.citeulike.org/article/3614906

hope it'll be useful to u....
mathu
 
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Re: Macro-algae to ethanol

Postby phyco » Mon Mar 02, 2009 2:12 pm

I think you only need to homogenize the algae before fermentation. For this we can use a high pressure homogenizer and there is no need for the alteration of pH or Temperature i guess.......
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Re: Macro-algae to ethanol

Postby guru » Mon Mar 02, 2009 3:03 pm

Hai....
Here is an interesting fact...

the amount of annual CO2 absorption ability of marine algae is 36.7 tons per ha, which is 5 - 7 times higher than that of wood-based. Therefore, if E20 (gasoline containing bioethanol by 20%) is used, the annual greenhouse gas reduction rate will be approximately 27%, which will reduce carbon tax approximately 300 billion Korean Wons, if converted into money value


http://envirofuel.com.au/2009/02/03/kor ... o-ethanol/
guru
 
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Re: Macro-algae to ethanol

Postby sofi » Tue Mar 03, 2009 12:23 pm

Hi,
For the past 2 years much of the algae biofuel interest shifted from land to sea.. Now a days lots of articles are being published on ocean fertilization for CO2 sequestration in and using the phytoplankton for fuel production.

Microscopic algae, that are suspended in the world’s ocean, absorb 45,000,000,000,000 (45 Billion Tonnes) of carbon dioxide every year. That’s over 5 times the total global carbon emissions resulting from human activity. The object then is to increase natural CO2 absorption to include emissions resulting from human activity. i.e. 8 billion tonnes p.a.


Source:http://www.fitzi.com.au/climatechange.pdf

Cultivation of of such macroalgae in open ocean will eventually disturb the ecology of the ocean...Is there Any small scale research done to monitor the environmental effects and confirm the safety of ocean ecological balance..
sofi
 
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Re: Macro-algae to ethanol

Postby clara » Tue Mar 03, 2009 12:54 pm

Hi,
To my knowledge there are around 11 ocean fertilization experiments were done.. Of which The Indo-German Iron Fertilization Experiment (LOHAFEX ) aimed at proving the theory was caught in the controversy with environmental organisations opposing the venture. They said that the Experiment violated the U. N. Convention on Biological Diversity. Its consequences were unpredictable.

all these experiments results says only the measure of CO2 sequestered and the process..... I don't think they ll talk about the effects in ocean ecology.

If you see any experimental results about the effects of iron fertilization on ocean ecology .. let me know..

Bye,
clara
 
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Re: Macro-algae to ethanol

Postby guru » Tue Mar 03, 2009 4:50 pm

Hi,
I found this interesting information recently...

Researchers from Tokyo University of Marine Science and Technology, Mitsubishi Research Institute, Mitsubishi Heavy Industries and several other private-sector firms envision a 10,000 square kilometer (3,860 square mile) seaweed farm at Yamatotai.


http://www.pinktentacle.com/2007/03/seaweed-as-biofuel/
guru
 
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Re: Macro-algae to ethanol

Postby greengold09 » Tue Mar 03, 2009 5:04 pm

Hi,
I want to know ... Is there any significant difference between the processes used to extract ethanol from macroalgae (sea weed) and that from microalgae?

I think the composition of microalgae is different from macroalgae..Although the process by which we get ethanol (fermentation is same).. The organism used to carry out these micro and macroalgae fermentation may vary and also the pretreatment before fermentation ...

Can anybody tell me the exact difference in both the process of convertion and in yield?
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Re: Macro-algae to ethanol

Postby clara » Wed Mar 04, 2009 11:28 am

To me the difference will be the both in the pretreatment or homogenization and also in the fermentation.

As the macroalgae and microalgae differs significantly in the structure as well as in the chemical composition, the initial treatment as well as the organism used for fermentation differs.

But ...
University of Hawai'i Professor Pengchen "Patrick" Fu developed an innovative technology, to produce high amounts of ethanol with modified cyanobacterias, as a new feedstock for ethanol, without entering in conflict with the food and feed-production .

Fu has developed strains of cyanobacteria — one of the components of pond scum — that feed on atmospheric carbon dioxide, and produce ethanol as a waste product.


In this case there is no need of fermentation at all...... Just grow the algae and distill the ethanol side by side..
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Re: Macro-algae to ethanol

Postby guru » Wed Mar 04, 2009 11:42 am

I also read about this research attempt... Algae feeds on the waste from sugarcane industry, Sunlight and CO2 to produce ethanol extracellular...... which means we can take the ethanol without disturbing the algae

In this technology algae is not feed stock .. It acts more like bioconvertion agent.. This is entirely different from ethanol from algae concept.
guru
 
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Re: Macro-algae to ethanol

Postby greengold09 » Wed Mar 04, 2009 11:54 am

It looks like they cultivate the algae continuously..Are they using this algae for any other purpose?

This seems to be genetically modified cyanobacteria.. Is it possible to use these organisms for any other purpose like fertilizer, feed, pharma purpose?
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