Working with the municipal water company VA Syd, the City of Malmö has established a pilot project in which kitchen waste disposers have been installed in 200 homes as an easy-to-manage method of dealing with food waste.
In the waste disposer, the ground food waste falls into a tank, while the water runs to the wastewater pipes. A sludge suction truck collects the waste for the local wastewater treatment plant, which uses it to produce biogas. The biogas is employed to produce electricity and heating, with a consequent reduction of CO2 emissions.
For more information on the different types of waste disposers, please refer to the following article titled New Collection System for Food Waste to Biogas.
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According to Sweden’s environmental protection agency (Naturvårdsverket),
- the system produces 0,9–4,9 m3 biogas per apartment and year, compared with 0,6–1,8 m3 for ordinary refuse separation,
- the quality of the organic matter is high enough that no post-processing or processing is needed for it to be used for biogas production, which saves costs,
- in addition, the food waste disposer has acted as a catalyst for personal environmental thinking for many residents.