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The incompatibility of food waste disposers with an aging sewer: Fact or Fiction?
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
2011 (English)Conference paper, Presentation (Other academic)
Abstract [en]

Impacts of food waste disposers (FWD) on the general condition of sewer systems has recently received more attention as a large number of municipalities are contemplating large scale introductions of the device. The main reasons behind the elevated interest are an increase in biogas generation from the anaerobic digester as well as a lesser demand for vehicle transportation of solid waste. Concerns have however been raised regarding potential problems in the sewer network such as accumulations of biofilms, sediments and fats. This paper discusses long term impacts of said parameters on the sewer system for the two municipalities Surahammar and Smedjebacken who decided to introduce FWD on a larger scale more than a decade ago. The study targeted areas which mainly were comprised of detached houses with concrete pipes laid during the 70s and plastic pipes from the 80s. In total, 146 pipes of a cumulative length of about 7000 meters were filmed. By applying one grading system as well as one weighing system for all the encountered deposits, it was possible to calculate a final score for each pipe which reflects the relative abundance of deposits. All final points were then analyzed statistically with regard to FWD-load, material and inclination using general linear regression. The result from the inspections indicated that FWD has an impact, albeit a minor one. Ungrounded egg shells were encountered in many places, in particular where there were sags present. The level of total amount of sediments was however not documented to be generally elevated when compared to pipes with few to none FWD. Biofilms and fats seemed to be slightly increased when in particular the ratio of households having installed a FWD upstream was high as well as for pipes which were installed with a gentle slope. As kitchen waste that was never intended for the FWD in the first place has been documented in the sewer, there also seems to be a further demand for informational campaigns regarding the operation of the device.

Place, publisher, year, edition, pages
2011.
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-39974Local ID: eed3df1e-8264-4deb-a42d-354c0ee7550cOAI: oai:DiVA.org:ltu-39974DiVA: diva2:1013494
Conference
Nordic Wastewater Conference : 14/11/2011 - 16/11/2011
Note
Godkänd; 2011; 20111220 (ysko)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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