Thermal and thermo-chemical pre-treatment of four waste residues and the effect on acetic acid production and methane synthesis

Strong, P. J. and Gapes, D. J. (2012) Thermal and thermo-chemical pre-treatment of four waste residues and the effect on acetic acid production and methane synthesis. Waste Management, 32 9: 1669-1677. doi:10.1016/j.wasman.2012.04.004


Author Strong, P. J.
Gapes, D. J.
Title Thermal and thermo-chemical pre-treatment of four waste residues and the effect on acetic acid production and methane synthesis
Journal name Waste Management   Check publisher's open access policy
ISSN 0956-053X
1879-2456
Publication date 2012-01-01
Sub-type Article (original research)
DOI 10.1016/j.wasman.2012.04.004
Volume 32
Issue 9
Start page 1669
End page 1677
Total pages 9
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Abstract In this study four diverse solid waste substrates (coal, Kraft pulp solids, chicken feathers and chicken processing waste) were thermally pre-treated (70, 140 and 200 °C), under an inert (nitrogen) or oxidative (oxygen) atmosphere, and then anaerobically digested.Membrane inlet mass spectrometry during the thermal and thermo-chemical reactions was successfully used to establish oxygen and carbon dioxide gas fluxes and product formation (acetic acid). There was significant solids hydrolysis pre-treatment at 200 °C under an oxidative atmosphere, as indicated by a decrease in the volatile suspended solids and an increase in dissolved organic carbon. Greater concentrations of volatile fatty acids were produced under oxidative conditions at higher temperatures.The methane yield more than tripled for feathers after pre-treatment at 140 °C (under both atmospheres), but decreased after oxidative pre-treatment at 200 °C, due to the destruction of available carbon by the thermo-chemical reaction. Methane yield more than doubled for the Kraft pulp solids with the 200 °C pre-treatment under oxidative conditions. This study illustrated the power of wet oxidation for solids destruction and its potential to improve methane yields generated during anaerobic digestion.
Keyword Anaerobic digestion
Biogas
Biosolid
Hydrolysis
Waste treatment
Wet oxidation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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