The need to use defined culture media to cultivate microal-gae for biofuels requires large-scale production of sterile solutionsof macro- and micronutrients and recycling of nutrients fromfuel-production residue. To support rapid microalgal growth inraceway ponds, supplementation with concentrated CO2is neces-sary, requiring either co-location of production ponds with a sourceof this nutrient, which would require extensive reengineering ofthese installations, or transport via pipeline, which would competewith existing markets for this industrial gas (Gao et al., 2012). Mostof the best solar resource for growing microalgae in the US is locatedin arid regions, making water supply challenging.