We’ve heard a lot about algae as a biofuel feedstock. But, now, a team of scientists from a privately-held lab in California have developed a breakthrough technology they claim will enable advanced biofuels and renewable chemicals to be manufactured from macroalgae—more commonly known as seaweed. The process, developed by Berkeley-based Bio Architecture Lab (BAL), works by first transforming seaweed into a renewable chemical intermediate, and then producing chemicals or fuels through chemical synthesis or fermentation.
According to BAL, aqua-farmed seaweed is the “world’s lowest cost, most scalable, and sustainable source of sugars for biofuels and renewable chemicals production.” And, in truth, seaweed overcomes many of the challenges facing commercial production of advanced biofuels. For one, like algae, it has no lignin – the chemical compound that makes veggies, plants and wood firm – and is highly resistant to the enzymes necessary to unlock the sugars in cellulosic biomass. It also has high sugar content.
However, according to Biofuels Digest, algal biofuel production has its own challenges, which some think could be addressed by transitioning to seaweed as a feedstock. First, there is the issue of getting the algae out of the water it grows in—this is much trickier than removing seaweed from the water.
Second, after extracting the lipids from algae, biofuel producers are left with a ton of residual biomass, which must be disposed of somehow—often, by burning it, or feeding it to cows. Either way, the water and the waste must be transported. This fact leads some critics to argue that the amount of fossil fuels that go into producing biofuels from algae make it an unsustainable biofuel feedstock.