Observations on microbial activity in acidified pig slurry

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dc.contributor.author Ottosen, L
dc.contributor.author Poulsen, H
dc.contributor.author Nielsen, DA
dc.contributor.author Finster, K
dc.contributor.author Nielsen, LP
dc.contributor.author Revsbech, NP
dc.date.accessioned 2012-02-02T10:56:25Z
dc.date.issued 2009-01
dc.identifier.citation Biosystems Engineering, 2009, 102 (3), pp. 291 - 297
dc.identifier.issn 1537-5110
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/15316
dc.description.abstract Acidification of pig slurry to pH 5.5 is used as a measure to reduce ammonia emission from pits and storages. The slurry is acidified with sulphuric acid in a process tank and pumped back to the slurry pits or to a storage tank. We investigated the effect of acidification on microbial activity. Oxygen consumption rate, methanogenesis and sulphate reduction were all reduced by more than 98% in the stored acidified slurry compared to untreated slurry. Despite higher sulphate concentration, the microbial metabolism was greatly compromised or absent in the acidified slurry. This could be explained by the high concentration of protonized short-chained volatile fatty acids in the acidified slurry (approximately 25 mM, compared to untreated slurry <0.1 mM), which act as an uncoupling agent of the cell membrane potential and thereby arrest microbial metabolism. In total the consequences of slurry acidification are greatly reduced production rates and loss of sulphide and methane, and eliminated loss of ammonia. On the other hand, increased volatilization and loss of smelly fatty acids is to be expected.
dc.publisher Academic Press Inc Elsevier Science
dc.relation.isbasedon 10.1016/j.biosystemseng.2008.12.003
dc.title Observations on microbial activity in acidified pig slurry
dc.type Journal Article
dc.parent Biosystems Engineering
dc.journal.volume 3
dc.journal.volume 102
dc.journal.number 3 en_US
dc.publocation San Diego en_US
dc.identifier.startpage 291 en_US
dc.identifier.endpage 297 en_US
dc.cauo.name SCI.Plant Functional Biology & Climate Change en_US
dc.conference Verified OK en_US
dc.for 0903 Biomedical Engineering
dc.personcode 112277
dc.percentage 100 en_US
dc.classification.name Biomedical Engineering en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity WOS:000264558300005 en_US
dc.location.activity WOS:000289210500013
dc.location.activity WOS:000264558300005
dc.description.keywords Atmospheric Ammonia
dc.description.keywords Emission Inventory
dc.description.keywords Sulfate Reduction
dc.description.keywords Reduced Nitrogen
dc.description.keywords Fresh-Water
dc.description.keywords Storage
dc.description.keywords Vegetation
dc.description.keywords Sediments
dc.description.keywords Acids
dc.description.keywords Soil
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)

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