The heat in used water is increasingly seen as a resource. At the level of individual industrial sites, for example, water often has to be heated, or heat is needed for other purposes. Much of this heat energy may remain in or be transferred to wastewater streams. It can therefore make sense to recover this heat to warm the incoming flow. Similarly, water use within homes warms the water, which then leaves the homes as sewage. This heat can be recovered from the sewer or at the treatment plant, for use in district heating systems, for example.
Dutch companies offer the expertise to help optimise these opportunities.