Denmark has eliminated waste to landfill since 1997. Currently the country’s concern is to increase biogas production for district heating and reduce reliance on coal. A desk study on FWDs was produced by a leading Danish engineering consultancy for members of the Danish Water and Wastewater Association (DANVA) and Danish municipalities.

It contained previously undocumented operational experience from municipalities and emanated from a request by DANVA's members and local authorities for reliable information on which to base decisions on whether to recommend or prohibit the installation of residential food waste disposers.

The report concluded that FWDs do not increase sedimentation and blockages and will not change the amount of fat in the sewer system. The extra water consumption is marginal and will not affect the hydraulic capacity of sewers or treatment plants. It also reported that the amount of refuse is reduced by 20-30% with fewer odour problems, better hygiene for collection workers and the possibility of less frequent collections.

As a result of the study, Odense, Denmark’s third largest city and one of the report’s municipal sponsors has recently announced that it will authorise FWD installations.

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