The cultivation of Algae is expected to bring double benefit to the environment in the sense that Algae can be used to extract nutrients from waste water, which it converts to fats for bio diesel production and Algae extracts pollution from the atmosphere.
Aside from the fact that expensive reactor systems are not required (presumably some sort of effective harvesting system would however be needed), unlike other algal-biofuel technologies this approach relies on ‘wild algae’ - ie. algae that naturally colonize sewage ponds already.
There is even a company in New Zealand (AquaFlow) that has a small shed next to the tertiary holding ponds at a sewage treatment plant that is producing just enough Biodiesel to provide 5 percent of the fuel for a small SUV
See the following pages in cultivation of Algae in sewage:
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