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Technical evaluation of a tank-connected food waste disposer system for biogas production and nutrient recovery

Davidsson, LU ; Bernstad Saraiva, A.; Magnusson, N. and Bissmont, M (2017) In Waste Management
Abstract

In this study, a tank-connected food waste disposer system with the objective to optimise biogas production and nutrient recovery from food waste in Malmö was evaluated. The project investigated the source-separation ratio of food waste through waste composition analyses, determined the potential biogas production in ground food waste, analysed the organic matter content and the limiting components in ground food waste and analysed outlet samples to calculate food waste losses from the separation tank.It can be concluded that the tank-connected food waste disposer system in Malmö can be used for energy recovery and optimisation of biogas production. The organic content of the collected waste is very high and contains a lot of energy... (More)

In this study, a tank-connected food waste disposer system with the objective to optimise biogas production and nutrient recovery from food waste in Malmö was evaluated. The project investigated the source-separation ratio of food waste through waste composition analyses, determined the potential biogas production in ground food waste, analysed the organic matter content and the limiting components in ground food waste and analysed outlet samples to calculate food waste losses from the separation tank.It can be concluded that the tank-connected food waste disposer system in Malmö can be used for energy recovery and optimisation of biogas production. The organic content of the collected waste is very high and contains a lot of energy rich fat and protein, and the methane potential is high.The results showed that approximately 38% of the food waste dry matter is collected in the tank. The remaining food waste is either found in residual waste (34% of the dry matter) or passes the tank and goes through the outlet to the sewer (28%). The relatively high dry matter content in the collected fraction (3-5% DM) indicates that the separation tank can thicken the waste substantially.The potential for nutrient recovery is rather limited considering the tank content. Only small fractions of the phosphorus (15%) and nitrogen (21%) are recyclable by the collected waste in the tank. The quality of the outlet indicates a satisfactory separation of particulate organic matter and fat. The organic content and nutrients, which are in dissolved form, cannot be retained in the tank and are rather led to the sewage via the outlet.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Biogas, Disposer, Food waste, Sorting, Tank system
in
Waste Management
publisher
Elsevier
external identifiers
  • scopus:85017160362
  • wos:000404490000017
ISSN
0956-053X
DOI
10.1016/j.wasman.2017.03.052
language
English
LU publication?
yes
id
785644e8-5724-4da1-8927-709b21adeae3
date added to LUP
2017-05-11 09:15:00
date last changed
2018-01-07 12:03:09
@article{785644e8-5724-4da1-8927-709b21adeae3,
  abstract     = {<p>In this study, a tank-connected food waste disposer system with the objective to optimise biogas production and nutrient recovery from food waste in Malmö was evaluated. The project investigated the source-separation ratio of food waste through waste composition analyses, determined the potential biogas production in ground food waste, analysed the organic matter content and the limiting components in ground food waste and analysed outlet samples to calculate food waste losses from the separation tank.It can be concluded that the tank-connected food waste disposer system in Malmö can be used for energy recovery and optimisation of biogas production. The organic content of the collected waste is very high and contains a lot of energy rich fat and protein, and the methane potential is high.The results showed that approximately 38% of the food waste dry matter is collected in the tank. The remaining food waste is either found in residual waste (34% of the dry matter) or passes the tank and goes through the outlet to the sewer (28%). The relatively high dry matter content in the collected fraction (3-5% DM) indicates that the separation tank can thicken the waste substantially.The potential for nutrient recovery is rather limited considering the tank content. Only small fractions of the phosphorus (15%) and nitrogen (21%) are recyclable by the collected waste in the tank. The quality of the outlet indicates a satisfactory separation of particulate organic matter and fat. The organic content and nutrients, which are in dissolved form, cannot be retained in the tank and are rather led to the sewage via the outlet.</p>},
  author       = {Davidsson,  and Bernstad Saraiva, A. and Magnusson, N. and Bissmont, M},
  issn         = {0956-053X},
  keyword      = {Biogas,Disposer,Food waste,Sorting,Tank system},
  language     = {eng},
  month        = {04},
  publisher    = {Elsevier},
  series       = {Waste Management},
  title        = {Technical evaluation of a tank-connected food waste disposer system for biogas production and nutrient recovery},
  url          = {http://dx.doi.org/10.1016/j.wasman.2017.03.052},
  year         = {2017},
}