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Enhancing performance in anaerobic high-solids stratified bed digesters by straw bed implementation

Svensson, Lars Mattias; Björnsson, Lovisa LU and Mattiasson, Bo LU (2004) In 9th World Congress, Anaerobic Digestion 2001, Anaerobic Conversion for Sustainability, Proceedings
Abstract
Anaerobic high-solids single-stage stratified bed digesters have been found to be simple and flexible design candidates for small-scale reactors located in medium- to low-technology environments. In the present study, wheat straw was used as the starter material for the stratified bed. Upon green mass feeding, the anaerobically stabilised straw bed functioned both as a biofilm support and as a particulate filter. It enabled a direct onset of 7 kg VSm(-3) batch loads, added twice a week, and permitted a low but consistent bed permeability during feeding at an average superficial flow velocity of 1 m d(-1) to be achieved. Fed-batch tests with sugar beet tops in pilot- and laboratory-scale setups at an average loading rate of 2 kg VSm(-3)... (More)
Anaerobic high-solids single-stage stratified bed digesters have been found to be simple and flexible design candidates for small-scale reactors located in medium- to low-technology environments. In the present study, wheat straw was used as the starter material for the stratified bed. Upon green mass feeding, the anaerobically stabilised straw bed functioned both as a biofilm support and as a particulate filter. It enabled a direct onset of 7 kg VSm(-3) batch loads, added twice a week, and permitted a low but consistent bed permeability during feeding at an average superficial flow velocity of 1 m d(-1) to be achieved. Fed-batch tests with sugar beet tops in pilot- and laboratory-scale setups at an average loading rate of 2 kg VSm(-3) d(-1) resulted in average biogas production rates of 1.2-1.4 m3 m(-3) d(-1) and methane yields of 0.31-0.36 m3 kg(-1) VS(added). At the end of the laboratory-scale feeding trial, the 200 day old straw bed had compacted to 50% of its initial volume, without any negative effects on performance being detectable. (Less)
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author
organization
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type
Contribution to journal
publication status
unpublished
subject
keywords
foaming, intermittent leachate recycle, lignocellulosics, fixed bed, farm-scale, straw bed priming, crop residues, packing density, dry digestion
in
9th World Congress, Anaerobic Digestion 2001, Anaerobic Conversion for Sustainability, Proceedings
issue
Part 2
publisher
Technologisch Instituut vzw
language
English
LU publication?
yes
id
5dfd1781-aa70-451a-912f-593c485a990c (old id 529740)
date added to LUP
2007-10-31 16:06:10
date last changed
2016-08-30 12:36:40
@article{5dfd1781-aa70-451a-912f-593c485a990c,
  abstract     = {Anaerobic high-solids single-stage stratified bed digesters have been found to be simple and flexible design candidates for small-scale reactors located in medium- to low-technology environments. In the present study, wheat straw was used as the starter material for the stratified bed. Upon green mass feeding, the anaerobically stabilised straw bed functioned both as a biofilm support and as a particulate filter. It enabled a direct onset of 7 kg VSm(-3) batch loads, added twice a week, and permitted a low but consistent bed permeability during feeding at an average superficial flow velocity of 1 m d(-1) to be achieved. Fed-batch tests with sugar beet tops in pilot- and laboratory-scale setups at an average loading rate of 2 kg VSm(-3) d(-1) resulted in average biogas production rates of 1.2-1.4 m3 m(-3) d(-1) and methane yields of 0.31-0.36 m3 kg(-1) VS(added). At the end of the laboratory-scale feeding trial, the 200 day old straw bed had compacted to 50% of its initial volume, without any negative effects on performance being detectable.},
  author       = {Svensson, Lars Mattias and Björnsson, Lovisa and Mattiasson, Bo},
  keyword      = {foaming,intermittent leachate recycle,lignocellulosics,fixed bed,farm-scale,straw bed priming,crop residues,packing density,dry digestion},
  language     = {eng},
  number       = {Part 2},
  publisher    = {Technologisch Instituut vzw},
  series       = {9th World Congress, Anaerobic Digestion 2001, Anaerobic Conversion for Sustainability, Proceedings},
  title        = {Enhancing performance in anaerobic high-solids stratified bed digesters by straw bed implementation},
  year         = {2004},
}