Posted by Big Gav in algae
Robert Rapier has an interview with an un-named company CEO about biofuel production from algae - Interview With an Algae CEO .
One of the things I did on the trip was take a tour of an algae farm. I spent some time with the CEO, and got to ask numerous questions. He had some very interesting comments, which I will capture below. Because he has to work in this industry, I am not going to identify him or his company. Below I will indicate his comments as CEO and mine as RR.
RR: Talk about some of the challenges of growing algae.
CEO: The list is exhaustive. It takes a lot of water. It takes a lot of electricity. Solar penetration is only about an inch into the water, so we really have to keep the ponds mixed well. One thing people never mention is the phosphorous requirement. Phosphorous is a limited resource, but a critical one for the algal growth. If you are trying to make oil, then you have to stress the algae and push it into a lipid production mode. But that causes growth rates to stall. If you engineer algae for higher oil production rates, they can't out-compete the native species in the ponds.
RR: I talk to John Benemann on a fairly regular basis, and he has said much the same. He likes algae for the potential, for the water treatment possibilities, and as something that should continue to get funding for lab research. But he is pretty harsh on the uber-optimists.
CEO: Yes, I know John as well. He has done some good work in the field. Have you seen his latest paper?
RR: (He shows me the paper, and I acknowledge that I do in fact have that one).
RR: I was looking at those open ponds and wondering if the evaporation rates wouldn't be problematic. That could create seriously high water usage, especially for those schemes that propose to use open ponds where the solar insolation is high (like in the Arizona desert).
CEO: Yes, those open ponds require a lot of fresh water. You should see our water bill.
RR: What about photobioreactors? Some people envision them as a solution to some of the problems (evaporation, contamination) of the open pond system.
CEO: They are ungodly expensive relative to how much algae they can produce.
RR: So how do you foresee the future of algal fuels?
CEO: There is no future. Look, some of these guys are out there committing fraud with their yield claims. Nobody is making fuel except for small amounts in the lab. I just don't see how anyone will ever make cost-competitive fuel from algae.
RR: How about fermentation approaches like Solazyme? I haven't written that off yet.
CEO: Yes, but they are using sugar, and sugar is food. They say they won't always use sugar, but who knows?