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Slow pyrolysis of organic fraction of municipal solid waste (OFMSW): characterisation of products and screening of the aqueous liquid product for anaerobic digestion

Slow pyrolysis of organic fraction of municipal solid waste (OFMSW): characterisation of products and screening of the aqueous liquid product for anaerobic digestion
Slow pyrolysis of organic fraction of municipal solid waste (OFMSW): characterisation of products and screening of the aqueous liquid product for anaerobic digestion
A comprehensive study of the energy yield from slow pyrolysis of the organic fraction of municipal solid waste (OFMSW) and energy recovery from the aqueous liquid product by anaerobic digestion has been carried out. In this paper, the results of the liquid pyrolysis product characterisation are presented, with toxicity and methane potential assessments of the aqueous liquid product. The OFMSW feedstock was obtained from a UK waste treatment plant. Shredded samples dried to different moisture contents (12.7–45.8%) were processed in a 300 g per hour auger screw pyrolysis reactor at temperatures from 450 to 850 °C. Sixteen pyrolysis runs were performed, with process mass balance closures above 90% obtained (wet feed basis). Pyrolysis liquids showed clear phase separation under gravity. With increasing processing temperature, the liquid yield (both organic and aqueous fraction) reduced but the gas yield increased. An investigation into the product energy distribution indicated that processing temperature had a strong effect on the product energy distribution, while the effect of feedstock moisture was relatively small. Batch anaerobic testing of the aqueous fraction showed that toxicity increased with pyrolysis processing temperature and decreased with feedstock moisture content. Statistical analysis confirmed that the pyrolysis processing temperature was the dominant factor affecting the toxicity of the aqueous product. Careful acclimatisation of the microbial consortium to the applied substrate and loading is likely to be necessary for improved digestion of the aqueous fraction.
0306-2619
158-168
Yang, Yang
d3c3f342-b5d3-4ed3-8e9e-4df4d4c44b97
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Venetsaneas, Nikolaos
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Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Bridgwater, Anthony
f634aca3-fa31-4cdd-9979-6d661bfe6fd2
Yang, Yang
d3c3f342-b5d3-4ed3-8e9e-4df4d4c44b97
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Venetsaneas, Nikolaos
e3fa0040-b5d7-4263-9900-9ca27800c966
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Bridgwater, Anthony
f634aca3-fa31-4cdd-9979-6d661bfe6fd2

Yang, Yang, Heaven, Sonia, Venetsaneas, Nikolaos, Banks, Charles and Bridgwater, Anthony (2018) Slow pyrolysis of organic fraction of municipal solid waste (OFMSW): characterisation of products and screening of the aqueous liquid product for anaerobic digestion. Applied Energy - Elsevier, 213, 158-168. (doi:10.1016/j.apenergy.2018.01.018).

Record type: Article

Abstract

A comprehensive study of the energy yield from slow pyrolysis of the organic fraction of municipal solid waste (OFMSW) and energy recovery from the aqueous liquid product by anaerobic digestion has been carried out. In this paper, the results of the liquid pyrolysis product characterisation are presented, with toxicity and methane potential assessments of the aqueous liquid product. The OFMSW feedstock was obtained from a UK waste treatment plant. Shredded samples dried to different moisture contents (12.7–45.8%) were processed in a 300 g per hour auger screw pyrolysis reactor at temperatures from 450 to 850 °C. Sixteen pyrolysis runs were performed, with process mass balance closures above 90% obtained (wet feed basis). Pyrolysis liquids showed clear phase separation under gravity. With increasing processing temperature, the liquid yield (both organic and aqueous fraction) reduced but the gas yield increased. An investigation into the product energy distribution indicated that processing temperature had a strong effect on the product energy distribution, while the effect of feedstock moisture was relatively small. Batch anaerobic testing of the aqueous fraction showed that toxicity increased with pyrolysis processing temperature and decreased with feedstock moisture content. Statistical analysis confirmed that the pyrolysis processing temperature was the dominant factor affecting the toxicity of the aqueous product. Careful acclimatisation of the microbial consortium to the applied substrate and loading is likely to be necessary for improved digestion of the aqueous fraction.

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Accepted/In Press date: 5 January 2018
e-pub ahead of print date: 28 January 2018
Published date: 1 March 2018

Identifiers

Local EPrints ID: 417347
URI: https://eprints.soton.ac.uk/id/eprint/417347
ISSN: 0306-2619
PURE UUID: f82805e8-3209-4330-94a9-0828d02f6479

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Date deposited: 30 Jan 2018 17:30
Last modified: 09 Dec 2019 18:24

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