Aye, but neither will a fuel tank contain Bb100 in the immediate future - it will be blended with other biofuels, and that is where a huge glut is forming of spare glycerin.

Symbiosis, or something like that...

 Maelinar,

BB cracks to gasoline, diesel, and jet fuel.  It does not need to be blended with anything.  I don't see any reason while all 3 tanks would not be filled with BB100.

BB will not lead to glycerin being produced. 

There is no huge glut of glycerin.  Large biodiesel processors purify it and sell it for many uses.  It is a problem for small, backyard processors.  The glycerin they produce has so many impuirities, they are unable to sell it.  Many add it to their compost piles.

Correction - if you are a small biodiesel brewer and the glycerin is in your backyard, you may have what seems like a huge glut of glycerin and be looking for something to do with it. 

Google says otherwise: http://www.google.com/search?q=glycerin+glut&rls=com.microsoft:en-au&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

 Maelinar,

They are talking about there being more glycerin available.  But the biodiesel plants are still charging for it.  

Since it is down to a nickel a pound, there is the possibility that it may contribute enough to the growth of the BB algae to make it worthwhile.  Since we will be contibuting to the supply, the price should stay low. 

http://www.biodieselmagazine.com/article.jsp?article_id=1123 

If you try this idea, use purified glycerine for your initial experiments.  The crude glycerin will have a lot of contaminates and some of them may poison your algae culture. 

I am editing my post because I realized after I posted that i was just reading the first page of posts in this thread. It's still true: 

"Correct - Botryococcus braunii oils (botryococcenes) can not be transesterified. They must be cracked. This means there is no glyercerin side-product. Botryococcus braunii has great potential, but it is not as easy to process as vegetable oils, which can be made into biodiesel. This is why, even though I am a great supporter of research on Bb, I encourage people who want to make their own fuel to start with other algal oils and to make biodiesel. I believe that Botryococcene processing is best done in a large-scale chemical plant. "

However now we are talking about whether there is a glycerine shortage or not. My understanding is that most glycerine is used in food and cosmetics - which in most countries call for greater quality control. Much greater quality control, so that no poisons can get in. In some places, the process you used must be certified as safe by an engineer. The more involved processing, and certification, cost money, so small producers don't do it. So they have waste glycerine, while the market for food-grade glycerine is still high. However, this waste glycerine is evidently perfectly suitable to be mixed in with animal feed. I read about one fellow feeding it to his goats, and the goats really liked it, and it's very nutritious. If you poison your own animals due to contaminants in glycerine, the loss is yours and the animals. However, if you poison a human...well that's a whole different story.

I'd be very circumspect about getting into the food-grade glycerine market right now. If you are a big-budget biodiesel processor, it might be worth it. Small-scale operations should take some elementary precautions, and then look into selling glycerine for animal feed, rather than dumping it as waste. I think it's a more profitable solution than using it to grow Bb, but that's just my guess.