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Evaluation of pressurised carbon dioxide pre-treatment aimed at improving the sanitisation and anaerobic digestibility of co-settled sewage sludge

Evaluation of pressurised carbon dioxide pre-treatment aimed at improving the sanitisation and anaerobic digestibility of co-settled sewage sludge
Evaluation of pressurised carbon dioxide pre-treatment aimed at improving the sanitisation and anaerobic digestibility of co-settled sewage sludge

This work reports on the use of pressurized CO2 pretreatment to improve methane yield and pathogen indicator organism die-off in co-settled sewage sludge (SS). Four semi-continuous mesophilic anaerobic digesters were fed on co-settled SS to establish a baseline for performance and stability. One pair of digesters was then fed with co-settled SS pretreated by P CO2 at 2800 kPa for 23 h. The trial continued for 70 days during which specific biogas and methane production, volatile solids destruction and loss of viability of Escherichia coli was monitored in test and control digesters. The pretreatment had no positive influence on any of these parameters, which was further confirmed using batch biochemical methane potential tests and direct measurement of die-off of E. coli and Salmonella enterica in samples of different sizes treated in pressure vessels of different sizes and in matrices of nutrient medium and co-settled SS. Pressurised CO2 pretreatment was effective at killing fecal indicator bacteria in nutrient medium but ineffectual in SS, strongly suggesting that the nature of suspending matrix was a principle determining factor. Paper concludes that pressurized CO2 pretreatment is not a satisfactory approach to improve either biogas production or pathogen destruction in anaerobic digestion.

Biogas, cell disruption, fecal indicator organism, pathogen, pretreatment, sewage sludge
1093-4529
Mushtaq, Maryam
7046915f-8cea-4281-a3e3-c91e0eba6410
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Mushtaq, Maryam
7046915f-8cea-4281-a3e3-c91e0eba6410
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571

Mushtaq, Maryam, Banks, Charles J. and Heaven, Sonia (2018) Evaluation of pressurised carbon dioxide pre-treatment aimed at improving the sanitisation and anaerobic digestibility of co-settled sewage sludge. Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering. (doi:10.1080/10934529.2018.1516082).

Record type: Article

Abstract

This work reports on the use of pressurized CO2 pretreatment to improve methane yield and pathogen indicator organism die-off in co-settled sewage sludge (SS). Four semi-continuous mesophilic anaerobic digesters were fed on co-settled SS to establish a baseline for performance and stability. One pair of digesters was then fed with co-settled SS pretreated by P CO2 at 2800 kPa for 23 h. The trial continued for 70 days during which specific biogas and methane production, volatile solids destruction and loss of viability of Escherichia coli was monitored in test and control digesters. The pretreatment had no positive influence on any of these parameters, which was further confirmed using batch biochemical methane potential tests and direct measurement of die-off of E. coli and Salmonella enterica in samples of different sizes treated in pressure vessels of different sizes and in matrices of nutrient medium and co-settled SS. Pressurised CO2 pretreatment was effective at killing fecal indicator bacteria in nutrient medium but ineffectual in SS, strongly suggesting that the nature of suspending matrix was a principle determining factor. Paper concludes that pressurized CO2 pretreatment is not a satisfactory approach to improve either biogas production or pathogen destruction in anaerobic digestion.

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JESHA-S-18-00268 - Accepted Manuscript
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More information

Accepted/In Press date: 20 August 2018
e-pub ahead of print date: 4 October 2018
Keywords: Biogas, cell disruption, fecal indicator organism, pathogen, pretreatment, sewage sludge

Identifiers

Local EPrints ID: 426120
URI: http://eprints.soton.ac.uk/id/eprint/426120
ISSN: 1093-4529
PURE UUID: 58d8a25f-08c0-48b3-8b73-473171ed9408
ORCID for Sonia Heaven: ORCID iD orcid.org/0000-0001-7798-4683

Catalogue record

Date deposited: 14 Nov 2018 17:30
Last modified: 07 Oct 2020 06:37

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