Feeding Large Heat Pumps from Sewage Water Treatment Plants
A number of large heat pump stations for district heating have recently been built in Sweden. Treated sewage water has been used as major low temperature energy source. Lake and sea water have also been used sometimes as additional energy to a sewage source. In the largest of them, the Hammarby 175 MW plant, water is transported from the sewage plant by gravity in a 2.7 km long rock tunnel and pumped up to and through the heat pump evaporators in two steps by submersible pumps. When returning to the recipient the head is used to recover energy with a 315 kW submersible hydroturbine generator. Multiple submersible pump concepts have been selected in order to cut total station costs and secure high availability. Basic pump station layouts are presented.
KeywordsZinc Vortex Foam Epoxy Sewage
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