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: international journal of integrated waste management, science and technology
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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3219276
- author
- Bernstad, Anna
LU
; Davidsson, Åsa
LU
; Tsai, Joanna
LU
; Johansson, Elin
LU
; Bissmont, M
and la Cour Jansen, Jes
LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Waste Management: international journal of integrated waste management, science and technology
- volume
- 33
- issue
- 1
- pages
- 193 - 203
- publisher
- Elsevier
- external identifiers
-
- wos:000312615800025
- pmid:23122206
- scopus:84872418707
- pmid:23122206
- 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
- 2016-04-01 13:13:58
- date last changed
- 2023-09-30 22:53:12
@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: international journal of integrated waste management, science and technology}},
title = {{Tank-connected food waste disposer systems - Current status and potential improvements.}},
url = {{http://dx.doi.org/10.1016/j.wasman.2012.09.022}},
doi = {{10.1016/j.wasman.2012.09.022}},
volume = {{33}},
year = {{2012}},
}