Comment Already done (Score 4, Informative) 90
This is already done in atleast one city in Sweden, the heat in the cleaned waste water gets transferred to a district heating system by a heat exchange system. And the then cooled down waste water (just above 0C) is used again as district cooling to a hospital.
The methane is usually used to power the waste water plant itself. Also often used as fuel in busses and cars.
The methane is usually used to power the waste water plant itself. Also often used as fuel in busses and cars.
