The installation of food waste grinders in Swedish municipalities have been a controversial issue in recent years. Some emphasize a reduced amount of solid waste that must be transported on wheels and a greater extraction of biogas from sewage treatment plants, while critics on the other hand argue that the extra share of organic waste, for example, can create more deposits in the piping. With reference in particular to the latter argument against food waste disposers, most Swedish municipalities adopted a negative attitude to the mills and allow at present no switching for individual households.
– Our study from 2012 highlights, among other things, that the mills are not able to atomize certain types of food residues such as egg shells. These gather instead of lines of depressions and bad tilt, says Annelie Hedström, researcher at Urban Water Engineering at Luleå University of Technology.
The conclusion in Luleå university study is that food waste disposers should be avoided on sections of pipe that previously experienced problems with blockages. To further minimize the risk of future problems, information about the leftovers that are not compatible with a food waste disposer distributed to households who install the device.
Below you can read a longer Abstract of the research in this area and the original report.