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

In English

Författare

Summary, in English

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.

Publiceringsår

2004

Språk

Engelska

Dokumenttyp

Konferensbidrag: abstract

Ämne

  • Industrial Biotechnology

Nyckelord

  • 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 date

2001-01-01

Status

Unpublished