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Strategies for enzyme dosing to enhance anaerobic digestion of sewage sludge

Davidsson, Åsa LU ; Wawrzynczyk, Joanna LU ; Norrlöw, Olof LU and la Cour Jansen, Jes LU (2007) In Journal of Residuals Science and Technology 4(1). p.1-7
Abstract
Enhancement of anaerobic digestion of sewage sludge by enzyme addition was demonstrated in batch digestion tests. A pre-hydrolysation step with addition of enzymes at controlled temperature during 4 hours was shown to increase the methane yield significantly. Further tests with direct feeding of enzymes together with fresh sludge to the digester gave the same effect of a methane yield increase. For implementation in full-scale, different strategies for adding the enzymes were tested in batch laboratory tests and pilot-scale continuous digestion. The addition to the inlet together with fresh sludge and addition with re-circulated digested sludge were compared. Both ways resulted in significant increases in methane production. The highest... (More)
Enhancement of anaerobic digestion of sewage sludge by enzyme addition was demonstrated in batch digestion tests. A pre-hydrolysation step with addition of enzymes at controlled temperature during 4 hours was shown to increase the methane yield significantly. Further tests with direct feeding of enzymes together with fresh sludge to the digester gave the same effect of a methane yield increase. For implementation in full-scale, different strategies for adding the enzymes were tested in batch laboratory tests and pilot-scale continuous digestion. The addition to the inlet together with fresh sludge and addition with re-circulated digested sludge were compared. Both ways resulted in significant increases in methane production. The highest yield was achieved when enzymes were added together with fresh sludge in continuous pilot-scale digestion. Enzymatic treatment decreased the biomass vitality in the digester without reducing the methanogenic activity. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Residuals Science and Technology
volume
4
issue
1
pages
1 - 7
publisher
DEStech Publications
external identifiers
  • wos:000244358100001
  • scopus:35348944488
ISSN
1544-8053
language
English
LU publication?
yes
id
e4a2b5bc-99f3-4e50-b965-b007ed2c3d65 (old id 674160)
date added to LUP
2007-12-06 14:16:32
date last changed
2017-01-01 07:10:03
@article{e4a2b5bc-99f3-4e50-b965-b007ed2c3d65,
  abstract     = {Enhancement of anaerobic digestion of sewage sludge by enzyme addition was demonstrated in batch digestion tests. A pre-hydrolysation step with addition of enzymes at controlled temperature during 4 hours was shown to increase the methane yield significantly. Further tests with direct feeding of enzymes together with fresh sludge to the digester gave the same effect of a methane yield increase. For implementation in full-scale, different strategies for adding the enzymes were tested in batch laboratory tests and pilot-scale continuous digestion. The addition to the inlet together with fresh sludge and addition with re-circulated digested sludge were compared. Both ways resulted in significant increases in methane production. The highest yield was achieved when enzymes were added together with fresh sludge in continuous pilot-scale digestion. Enzymatic treatment decreased the biomass vitality in the digester without reducing the methanogenic activity.},
  author       = {Davidsson, Åsa and Wawrzynczyk, Joanna and Norrlöw, Olof and la Cour Jansen, Jes},
  issn         = {1544-8053},
  language     = {eng},
  number       = {1},
  pages        = {1--7},
  publisher    = {DEStech Publications},
  series       = {Journal of Residuals Science and Technology},
  title        = {Strategies for enzyme dosing to enhance anaerobic digestion of sewage sludge},
  volume       = {4},
  year         = {2007},
}