H2intheKNOW

From 'Where The Sewers End': Looking at the grim beauty of the DC Blue Plains Wastewater Treatment Plant [Spotted by Sarah]

Of course, purification comes with consequences—or, at least, byproducts. What happens to all the gook the plant has taken out of the 350-some million gallons of sewage that flows through it every day? The stuff from the earlier stages is garbage, and has to be dumped in landfills. But the later sludge is reusable. To make it light enough to be trucked away, it gets processed in that giant boxy building with the centrifuges. Like the guides say, don’t go in.