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A New Zealand company has successfully turned sewage into modern-day gold.
Marlborough-based Aquaflow Bionomic yesterday announced it had produced its first sample of bio-diesel fuel from algae in sewage ponds.
It is believed to be the world's first commercial production of bio-diesel from "wild" algae outside the laboratory - and the company expects to be producing at the rate of at least one million litres of the fuel each year from Blenheim by April.
As for contamination, I'm not sure what you mean by that. Contaminated with what exactly? Are you talking about bad bacteria and/or other 'weed' algae?