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Tank-connected food waste disposer systems - Current status and potential improvements.

Bernstad, Anna LU ; Davidsson, Åsa LU ; Tsai, Joanna LU ; Johansson, Elin LU ; Bissmont, M and la Cour Jansen, Jes LU (2012) In Waste Management 33(1). p.193-203
Abstract
An unconventional system for separate collection of food waste was investigated through evaluation of three full-scale systems in the city of Malmö, Sweden. Ground food waste is led to a separate settling tank where food waste sludge is collected regularly with a tank-vehicle. These tank-connected systems can be seen as a promising method for separate collection of food waste from both households and restaurants. Ground food waste collected from these systems is rich in fat and has a high methane potential when compared to food waste collected in conventional bag systems. The content of heavy metals is low. The concentrations of N-tot and P-tot in sludge collected from sedimentation tanks were on average 46.2 and 3.9g/kg TS, equalling an... (More)
An unconventional system for separate collection of food waste was investigated through evaluation of three full-scale systems in the city of Malmö, Sweden. Ground food waste is led to a separate settling tank where food waste sludge is collected regularly with a tank-vehicle. These tank-connected systems can be seen as a promising method for separate collection of food waste from both households and restaurants. Ground food waste collected from these systems is rich in fat and has a high methane potential when compared to food waste collected in conventional bag systems. The content of heavy metals is low. The concentrations of N-tot and P-tot in sludge collected from sedimentation tanks were on average 46.2 and 3.9g/kg TS, equalling an estimated 0.48 and 0.05kgN-tot and P-tot respectively per year and household connected to the food waste disposer system. Detergents in low concentrations can result in increased degradation rates and biogas production, while higher concentrations can result in temporary inhibition of methane production. Concentrations of COD and fat in effluent from full-scale tanks reached an average of 1068mg/l and 149mg/l respectively over the five month long evaluation period. Hydrolysis of the ground material is initiated between sludge collection occasions (30days). Older food waste sludge increases the degradation rate and the risks of fugitive emissions of methane from tanks between collection occasions. Increased particle size decreases hydrolysis rate and could thus decrease losses of carbon and nutrients in the sewerage system, but further studies in full-scale systems are needed to confirm this. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Waste Management
volume
33
issue
1
pages
193 - 203
publisher
Elsevier
external identifiers
  • wos:000312615800025
  • pmid:23122206
  • scopus:84872418707
ISSN
1879-2456
DOI
10.1016/j.wasman.2012.09.022
language
English
LU publication?
yes
id
94c48d9c-e4f5-4dc8-b929-6937453c2f9d (old id 3219276)
date added to LUP
2012-12-14 12:45:38
date last changed
2017-09-24 03:54:01
@article{94c48d9c-e4f5-4dc8-b929-6937453c2f9d,
  abstract     = {An unconventional system for separate collection of food waste was investigated through evaluation of three full-scale systems in the city of Malmö, Sweden. Ground food waste is led to a separate settling tank where food waste sludge is collected regularly with a tank-vehicle. These tank-connected systems can be seen as a promising method for separate collection of food waste from both households and restaurants. Ground food waste collected from these systems is rich in fat and has a high methane potential when compared to food waste collected in conventional bag systems. The content of heavy metals is low. The concentrations of N-tot and P-tot in sludge collected from sedimentation tanks were on average 46.2 and 3.9g/kg TS, equalling an estimated 0.48 and 0.05kgN-tot and P-tot respectively per year and household connected to the food waste disposer system. Detergents in low concentrations can result in increased degradation rates and biogas production, while higher concentrations can result in temporary inhibition of methane production. Concentrations of COD and fat in effluent from full-scale tanks reached an average of 1068mg/l and 149mg/l respectively over the five month long evaluation period. Hydrolysis of the ground material is initiated between sludge collection occasions (30days). Older food waste sludge increases the degradation rate and the risks of fugitive emissions of methane from tanks between collection occasions. Increased particle size decreases hydrolysis rate and could thus decrease losses of carbon and nutrients in the sewerage system, but further studies in full-scale systems are needed to confirm this.},
  author       = {Bernstad, Anna and Davidsson, Åsa and Tsai, Joanna and Johansson, Elin and Bissmont, M and la Cour Jansen, Jes},
  issn         = {1879-2456},
  language     = {eng},
  number       = {1},
  pages        = {193--203},
  publisher    = {Elsevier},
  series       = {Waste Management},
  title        = {Tank-connected food waste disposer systems - Current status and potential improvements.},
  url          = {http://dx.doi.org/10.1016/j.wasman.2012.09.022},
  volume       = {33},
  year         = {2012},
}