How do wastewater grid operators feel about this technology and about its being installed in their pipelines?

Wastewater management is a public service. The top priority is to ensure uninterrupted operation. Heat exchangers in the wastewater pipelines will therefore only be approved if they do not impede or restrict the wastewater management in any way. Our Therm-Liner system fulfills that requirement, with heat exchangers that can be installed during ongoing operations and that do not need any maintenance or cleaning.
Wastewater grid operators in many cities are now approving the installation of heat exchangers. Some of them charge a usage fee to cover the small amount of attendant paperwork. This fee also makes wastewater grid operators generally more open towards wastewater heat and the energy potential in their own pipelines. Some wastewater grid operators have already created energy maps to illustrate that potential and have put them online. This allows anyone to check specific locations as to the feasibility of wastewater energy recovery there.
One reservation that wastewater grid operators often have is that the wastewater cools down when energy is removed. Although it is true that thermal energy is removed from the wastewater when energy is extracted, thereby cooling it down, the temperature is restored very quickly, thanks to the inflow of new wastewater and the absorption of ambient heat through the pipeline. The key factor, therefore, for wastewater treatment plants, which generally require a certain minimum temperature of the wastewater, is how much heat the last heat exchanger upstream of the treatment plant extracts from the wastewater and how far away it is from the treatment plant. The energy extraction in the network upstream of that one has no bearing on the treatment plants. The fact that the wastewater cools down therefore does not pose an obstacle to wastewater energy recovery.

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