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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) 9th World Congress for Anaerobic Digestion. Anaerobic Conversion for Sustainability. 2001
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
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organization
publishing date
type
Contribution to conference
publication status
unpublished
subject
keywords
foaming, intermittent leachate recycle, lignocellulosics, fixed bed, farm-scale, straw bed priming, crop residues, packing density, dry digestion
conference name
9th World Congress for Anaerobic Digestion. Anaerobic Conversion for Sustainability. 2001
conference dates
2001-01-01
language
English
LU publication?
yes
id
5dfd1781-aa70-451a-912f-593c485a990c (old id 529740)
date added to LUP
2016-04-04 10:03:45
date last changed
2020-03-17 11:12:49
@misc{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}},
  keywords     = {{foaming; intermittent leachate recycle; lignocellulosics; fixed bed; farm-scale; straw bed priming; crop residues; packing density; dry digestion}},
  language     = {{eng}},
  title        = {{Enhancing performance in anaerobic high-solids stratified bed digesters by straw bed implementation}},
  url          = {{https://lup.lub.lu.se/search/files/77278926/624674.pdf}},
  year         = {{2004}},
}