Spacekiwi wrote:Yeah, it is, but for our purposes here, from what i understand, this chemical process is more efficient than photosynthesis, and as it only requires heat, you can vat grow, increasing the density of organisms per sq m, and allow for layering, without blocking the energy input source. Plus, it doesnt require building new facilities, only refitting in available space at current factories, similar to the ones used at breweries, ice creameries, etc. The tech models i have seen are basically 4 metre high catalytic converter things, with iout pipes from force filter out the carbon and 'pollutants' (sulfur, heavy metals) which the bacteria eat, and to act like a radiator for constant heat throughout, reducing the impact of a gradient in energy as with sunlight. Alternatively, we have a large geothermal power plant, so we could use the bacteria there. The nz company Lanzatech, who I've toured, currently have factories in china, nz, and the US, and have multiple sites contributing over 1.1 million litres (lowest estimate from what i could find from mid 14) of fuel a year at the moment, and provide jetfuel for virgin atlantic. Currently they are worth about 450 million US. From what I understand, they expect to expand even more by next year, and increase output even more. Plus, recently they apparently got a new mutation that may allow plastics. Not bad for some JAFA's..... (just another ******* Aucklander for non kiwis....)Relax wrote:
Energy is energy. Gotta convert freely available C02 and H20 to CH bonds. Light is essentially heat. If you get your heat from "waste heat" off steel mills or steam turbines etc it amounts to same thing. Heat is required to feed the algae/bacteria. In short need giant tanks with a transparent top letting light in. So, hmm coal/NG for a source of heat/C02 + water + bacteria + heat + sugar(depends)... = massive bacteria growth/biofuel. If go with photsynthesis need the surface scum type of algae for ease of collection.
And yes, that will require GINORMOUS shallow ponds. Problem is where there is LOTS of sun, there is little fresh water. Now if one can create a surface scum bacteria via SALT water... Then we are talking. Massive shallow ponds growing seaweed(a type of algae). This is more doable than large tanks trying to grow bacteria. Vast areas exist for doing this type of "farming". Of course this "farming" will completely devastate the area for any possible future plant growth due to the salt.
We are talking millions of square miles required. Uh, Sahara here we come. Australia as well.
If I were to design a "perfect" biofuel I would design the bacteria/algae/plankton to produce hydrocarbons rather than relying on ethanol because the energy density is so much higher. That will of course require significant GM tinkering on the selected species.
I like Relax's idea of making the fuel producer salt water compatible. My original thought was to put desalination plants next to the biofuel production sites and use the biofuel to power them. But I like the idea of salt water compatibility better.
I also like SpaceKiwi's idea of utilizing waste heat to produce biofuel as well. I don't think there is enough waste heat to completely replace fossil fuels though.
But there is no reason that 2 (or more) organisms cannot be designed. One could be a photosynthesis based saltwater organism modified to utilize the full spectrum of light, another a chemical based organism designed to make the most of efficient use of waste heat, etc. Another reason to utilize two organisms (preferably more) is to avoid the risks that come with a single source.
Might want to add west Texas to the Sahara, and Western Australia list.