Generating electricity from dirty bath water

A professor of electronic engineering has developed a means of extracting the heat from the leftover bath water and turning it into electricity. The system uses a series of thermocouples, similar to the temperature measuring devices found in the control equipment of domestic central heating systems and fridges. Instead of letting wastewater run down the plughole, the process takes the heat out of it to create electricity. Work is now under way to develop commercial designs which will generate electricity from waste water on a large scale.

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