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Evaluation of parameters for monitoring an anaerobic co-digestion process

Björnsson, Lovisa LU ; Murto, Marika LU and Mattiasson, Bo LU (2000) In Applied Microbiology and Biotechnology 54(6). p.844-849
Abstract
The system investigated in this study is an anaerobic digester at a municipal wastewater treatment plant operating on sludge from the wastewater treatment, co-digested with carbohydrate-rich food-processing waste. The digester is run below maximum capacity to prevent overload. Process monitoring at present is not extensive, even for the measurement of on-line gas production rate and off-line pH. Much could be gained if a better program for monitoring and control was developed, so that the full capacity of the system could be utilised without the risk of overload. The only limit presently set for correct process operation is that the pH should be above 6.8. In the present investigation, the pH was compared with alkalinity, gas production... (More)
The system investigated in this study is an anaerobic digester at a municipal wastewater treatment plant operating on sludge from the wastewater treatment, co-digested with carbohydrate-rich food-processing waste. The digester is run below maximum capacity to prevent overload. Process monitoring at present is not extensive, even for the measurement of on-line gas production rate and off-line pH. Much could be gained if a better program for monitoring and control was developed, so that the full capacity of the system could be utilised without the risk of overload. The only limit presently set for correct process operation is that the pH should be above 6.8. In the present investigation, the pH was compared with alkalinity, gas production rate, gas composition and the concentration of volatile fatty acids (VFA). Changes in organic load were monitored in the full-scale anaerobic digester and in laboratory-scale models of the plant. Gas-phase parameters showed a slow response to changes in load. The VFA concentrations were superior for indicating overload of the microbial system, but alkalinity and pH also proved to be good monitoring parameters. The possibility of using pH as a process indicator is, however, strongly dependent on the buffering capacity. In this study, a minor change in the amount of carbohydrates in the substrate had drastic effects on the buffering effect of the system. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Microbiology and Biotechnology
volume
54
issue
6
pages
844 - 849
publisher
Springer
external identifiers
  • scopus:0034530461
ISSN
1432-0614
DOI
10.1007/s002530000471
language
English
LU publication?
yes
id
53d705b5-7dff-4160-9bae-78e8610c4b1f (old id 789432)
date added to LUP
2007-12-21 10:02:34
date last changed
2017-06-25 03:38:16
@article{53d705b5-7dff-4160-9bae-78e8610c4b1f,
  abstract     = {The system investigated in this study is an anaerobic digester at a municipal wastewater treatment plant operating on sludge from the wastewater treatment, co-digested with carbohydrate-rich food-processing waste. The digester is run below maximum capacity to prevent overload. Process monitoring at present is not extensive, even for the measurement of on-line gas production rate and off-line pH. Much could be gained if a better program for monitoring and control was developed, so that the full capacity of the system could be utilised without the risk of overload. The only limit presently set for correct process operation is that the pH should be above 6.8. In the present investigation, the pH was compared with alkalinity, gas production rate, gas composition and the concentration of volatile fatty acids (VFA). Changes in organic load were monitored in the full-scale anaerobic digester and in laboratory-scale models of the plant. Gas-phase parameters showed a slow response to changes in load. The VFA concentrations were superior for indicating overload of the microbial system, but alkalinity and pH also proved to be good monitoring parameters. The possibility of using pH as a process indicator is, however, strongly dependent on the buffering capacity. In this study, a minor change in the amount of carbohydrates in the substrate had drastic effects on the buffering effect of the system.},
  author       = {Björnsson, Lovisa and Murto, Marika and Mattiasson, Bo},
  issn         = {1432-0614},
  language     = {eng},
  number       = {6},
  pages        = {844--849},
  publisher    = {Springer},
  series       = {Applied Microbiology and Biotechnology},
  title        = {Evaluation of parameters for monitoring an anaerobic co-digestion process},
  url          = {http://dx.doi.org/10.1007/s002530000471},
  volume       = {54},
  year         = {2000},
}