Washington D.C. has incorporated a new system for sewers. Specifically, using thermal energy (hydrolysis) to turn wastewater into electricity. This idea comes from a product which originated in Norway which is called the Cambi system. The sewage starts off in an apparatus that drains off the liquid, and then the screened product will flow into four pulpers, tall stainless steel vats that look like soda cans. Steam that is recycled from farther down the process is used to preheat it, and then it flows into one of the two dozen Cambis which serve as pressure cookers. The product is heated to more than 320 degrees under as much as 138 pounds of pressure for 22 minutes. Then it moves to a flash tank, where the temperature and pressure drop dramatically and a critical change takes place. This process is, essentially, creating methane to generate electric power. After additional purification, the methane will be used to fire three jet turbine engines that create electricity. In addition to this very unique methodology for sewer treatment and purification, the city is also in the process of increasing the sewer system capacity with new tunnels and green infrastructure projects like green roofs that filter rainwater where it falls.
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