ASHLEY COOPER / SCIENCE PHOTO LIBRARY ASHLEY COOPER / SCIENCE PHOTO LIBRARY
Pumps oxygenate the sewage water at Daveyhulme waste water treatment works in Manchester, UK. United Utilities Daveyhulme plant process's all of Manchester's sewage and deals with 714 million litres a day. The sewage sludge from the plant is put in huge biodigesters which produce biogas from the human waste. This biogas is 70% methane a potent greenhouse gas. The biogas is burnt on site in a heat and power plant, preventing its release into the atmosphere. The plant generates around 7 megawatts of electricity per day from the renewable biogas.
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