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Startup of an anaerobic single stage digester with a fixed wheat straw bed

Svensson, Mattias LU ; Batstone, Damien LU ; Björnsson, Lovisa LU and Mattiasson, Bo LU (2001) In 9th World Congress, Anaerobic Digestion 2001, Anaerobic Conversion for Sustainability, Proceedings p.549-551
Abstract
The most common form of technology for energy utilization via anaerobic treatment is slurry digestion with

a low solids contents, such as sewage sludge or manure.

Process control and maintenance are relatively simple, but costs involved with liquid handling and heating

favour large, centralised plants. Raising the solids content of a digester to 30% significantly improves the

economy of anaerobic digestion, increasing the methane production per volume unit reactor, and avoiding

the handling and heating of large volumes of process water.

One simple and potentially cheap method of high-solids reactor implementation is a single stage fixed bed

reactor, with a solid substrate as... (More)
The most common form of technology for energy utilization via anaerobic treatment is slurry digestion with

a low solids contents, such as sewage sludge or manure.

Process control and maintenance are relatively simple, but costs involved with liquid handling and heating

favour large, centralised plants. Raising the solids content of a digester to 30% significantly improves the

economy of anaerobic digestion, increasing the methane production per volume unit reactor, and avoiding

the handling and heating of large volumes of process water.

One simple and potentially cheap method of high-solids reactor implementation is a single stage fixed bed

reactor, with a solid substrate as the bed and a recycled leachate stream One potential problem with this design is an initial organic acid production during reactor startup, which originates from the easily degradable substrate. A low initial loading rate gives a safer but prolonged startup, and decreases gas production in this period. The choice of substrate strongly influences the probability of clogging. A more careful choice of carrier material allows quicker startup, and reduces the risk of clogging. The material

should degrade slowly, to avoid overload during startup, and have a rigid structure in order to avoid clogging.

This bed can then be fed from the top with more easily degradable substrate, e.g. crop residue. In this study, we

demonstrate startup of a single stage wheat straw (low biodegradability) reactor in a fixed bed. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
bed density, recirculation, high-solids anaerobic digestion, startup, wheat straw, fixed bed
in
9th World Congress, Anaerobic Digestion 2001, Anaerobic Conversion for Sustainability, Proceedings
editor
Verstraete, W and Van Velsen, L
pages
549 - 551
publisher
Technologisch Instituut vzw
ISBN
90-76019-16-9
language
English
LU publication?
yes
id
d3173f38-7440-4bdd-969f-27d856e9a032 (old id 528381)
date added to LUP
2007-09-25 12:01:04
date last changed
2016-04-16 09:37:13
@misc{d3173f38-7440-4bdd-969f-27d856e9a032,
  abstract     = {The most common form of technology for energy utilization via anaerobic treatment is slurry digestion with<br/><br>
a low solids contents, such as sewage sludge or manure.<br/><br>
Process control and maintenance are relatively simple, but costs involved with liquid handling and heating<br/><br>
favour large, centralised plants. Raising the solids content of a digester to 30% significantly improves the<br/><br>
economy of anaerobic digestion, increasing the methane production per volume unit reactor, and avoiding<br/><br>
the handling and heating of large volumes of process water.<br/><br>
One simple and potentially cheap method of high-solids reactor implementation is a single stage fixed bed<br/><br>
reactor, with a solid substrate as the bed and a recycled leachate stream One potential problem with this design is an initial organic acid production during reactor startup, which originates from the easily degradable substrate. A low initial loading rate gives a safer but prolonged startup, and decreases gas production in this period. The choice of substrate strongly influences the probability of clogging. A more careful choice of carrier material allows quicker startup, and reduces the risk of clogging. The material<br/><br>
should degrade slowly, to avoid overload during startup, and have a rigid structure in order to avoid clogging.<br/><br>
This bed can then be fed from the top with more easily degradable substrate, e.g. crop residue. In this study, we<br/><br>
demonstrate startup of a single stage wheat straw (low biodegradability) reactor in a fixed bed.},
  author       = {Svensson, Mattias and Batstone, Damien and Björnsson, Lovisa and Mattiasson, Bo},
  editor       = {Verstraete, W and Van Velsen, L},
  isbn         = {90-76019-16-9},
  keyword      = {bed density,recirculation,high-solids anaerobic digestion,startup,wheat straw,fixed bed},
  language     = {eng},
  pages        = {549--551},
  publisher    = {ARRAY(0x8e1eda8)},
  series       = {9th World Congress, Anaerobic Digestion 2001, Anaerobic Conversion for Sustainability, Proceedings},
  title        = {Startup of an anaerobic single stage digester with a fixed wheat straw bed},
  year         = {2001},
}