In London's underground is a massive "fatberg" that is 130 tons and blocking the sewer system. London has a chronic problem with "fatbergs." While the city usually sends in a sanitation team to remove the fat to send to the landfill, this time they are making use of it.
London will be converting the fatberg into 10,000 liters of biodiesel. That is enough biodiesel to run 350 doubledecker buses.
How do "fatbergs" form?
Fatbergs form when people pour oils and fats down their drains. When they cool, they harden and block pipes.
Since the beginning of September, high-powered jets have been working to break down the fats. The fats will then be sucked up from the sewer. The fats will be transported to a specialist plant that will convert it to bio-diesel.
Thames Water is working with Argent Energy on this project.
Alex Saunders, Waste Network Manager at Thames Water said, "We have a problem with fatbergs, both in sewer networks and at our sewage treatment works. Previously, we've either extracted the fatberg out of the pipes and sent it to landfill, or broken it down and put it back through the sewage treatment process. Even though they are our worst enemy, and we want them dead completely, bringing fatbergs back to life when we do find them in the form of biodiesel is afar better solution."
See a fatberg up close on this clip from BBC Earth.
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