This is really not hard to figure out. Take a biofuel refinery, put up a few greenhouses next door to feed it— instead of trucking loads of corn all over the country, or importing soybeans or other foods.
Look, the bags provide a lot of growable surface area, a shield against contaminant strains of algae, and minimal evaporation. These three problems have been the main gripe against algae as a fuel source.
Also, water and oil don’t mix. It’s easy to skim it off the top.
Why are you so opposed? You have something against technological advancement?
The bags are silly. Imagine, instead, a pipe of used oil barrels on the bottom, clear plastic on the top. Adjust pipe leanth to life cucly of algae, and flow rate.
Input salt water, algae starters, and emissions from local coal-fired plant at one end.
pull pond scum from other end, and water - feed water bach to front of loop.
squeeze pond scum, allow oil and water to seperate.
Feed water and dry debris back to front of loop.
Process oil.
Repeat.
Inputs - salt water, waste gasses, starter stock.
Output - diesel.