Energy and Carbon Implications of Rainwater Harvesting and Greywater Recycling (2010)

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This report by the Environment Agency presents the findings of a study that examined the energy and carbon implications of rainwater harvesting and greywater recycling systems for non-potable use. It quantifies lifetime carbon footprints of rainwater harvesting and greywater recycling systems and the contribution to reducing CO2 emissions associated with mains water demand and foul water volumes. The study showed that buildings using harvested rainwater or treated greywater typically increase CO2 emissions. Apart from one system, operational energy and carbon intensities of the systems studied were higher than for mains water.

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