I've been reading about biodiesel and about using vegitable oil from algae. It would seem that per acre you can produce 250 times as much vegitable oil using algae than soy beans.
I've been looking into the necessary parts for a very small scale demonstration project, including production, harvesting, drying and converting oil into diesel, but I'm having problems finding information of oil extraction. There are some very large oil extractors using screw and expeller. Even a very small one would cost several thousand dollars and since it is made for seeds I'm not sure it would work with algae.
Does anyone here know about oil extraction process and how it can be scaled down and used with algae?
The system I envision would only take the first pass in extracting oil, about 70%. From what I've been reading it is possible to get another 25% but requires some very nasty chemicals. Also, taking only that first press, the leftovers (refered to as "oil cake") makes for an excellent animal feed. After extracting that last 25% the leftovers are no longer suitable because of the toxic chemicals used. I'd rather have the 70% and animal feed and not have to bother with some very elaborate procedures for handling toxic chemicals.
Anyone else interested in helping to put together a demo project like this? I already have resources on converting voil to biodiesel. Like I said, I'm mostly looking for information on extracting the oil.