Cargando…

Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process

Current treatment routes are not suitable to reduce and stabilise bacterial content in some dairy process streams such as separator and bactofuge desludges which currently present a major emission problem faced by dairy producers. In this study, a novel method for the processing of desludge was deve...

Descripción completa

Detalles Bibliográficos
Autores principales: Overton, Tim W., Lu, Tiejun, Bains, Narinder, Leeke, Gary A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Paris 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4768234/
https://www.ncbi.nlm.nih.gov/pubmed/27034747
http://dx.doi.org/10.1007/s13594-015-0241-6
_version_ 1782417914348961792
author Overton, Tim W.
Lu, Tiejun
Bains, Narinder
Leeke, Gary A.
author_facet Overton, Tim W.
Lu, Tiejun
Bains, Narinder
Leeke, Gary A.
author_sort Overton, Tim W.
collection PubMed
description Current treatment routes are not suitable to reduce and stabilise bacterial content in some dairy process streams such as separator and bactofuge desludges which currently present a major emission problem faced by dairy producers. In this study, a novel method for the processing of desludge was developed. The new method, elevated pressure sonication (EPS), uses a combination of low frequency ultrasound (20 kHz) and elevated CO(2) pressure (50 to 100 bar). Process conditions (pressure, sonicator power, processing time) were optimised for batch and continuous EPS processes to reduce viable numbers of aerobic and lactic acid bacteria in bactofuge desludge by ≥3-log fold. Coagulation of proteins present in the desludge also occurred, causing separation of solid (curd) and liquid (whey) fractions. The proposed process offers a 10-fold reduction in energy compared to high temperature short time (HTST) treatment of milk.
format Online
Article
Text
id pubmed-4768234
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Springer Paris
record_format MEDLINE/PubMed
spelling pubmed-47682342016-03-29 Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process Overton, Tim W. Lu, Tiejun Bains, Narinder Leeke, Gary A. Dairy Sci Technol Original Paper Current treatment routes are not suitable to reduce and stabilise bacterial content in some dairy process streams such as separator and bactofuge desludges which currently present a major emission problem faced by dairy producers. In this study, a novel method for the processing of desludge was developed. The new method, elevated pressure sonication (EPS), uses a combination of low frequency ultrasound (20 kHz) and elevated CO(2) pressure (50 to 100 bar). Process conditions (pressure, sonicator power, processing time) were optimised for batch and continuous EPS processes to reduce viable numbers of aerobic and lactic acid bacteria in bactofuge desludge by ≥3-log fold. Coagulation of proteins present in the desludge also occurred, causing separation of solid (curd) and liquid (whey) fractions. The proposed process offers a 10-fold reduction in energy compared to high temperature short time (HTST) treatment of milk. Springer Paris 2015-07-10 2015 /pmc/articles/PMC4768234/ /pubmed/27034747 http://dx.doi.org/10.1007/s13594-015-0241-6 Text en © The Author(s) 2015 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Original Paper
Overton, Tim W.
Lu, Tiejun
Bains, Narinder
Leeke, Gary A.
Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process
title Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process
title_full Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process
title_fullStr Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process
title_full_unstemmed Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process
title_short Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO(2) and ultrasonic process
title_sort reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed co(2) and ultrasonic process
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4768234/
https://www.ncbi.nlm.nih.gov/pubmed/27034747
http://dx.doi.org/10.1007/s13594-015-0241-6
work_keys_str_mv AT overtontimw reductionofaerobicandlacticacidbacteriaindairydesludgeusinganintegratedcompressedco2andultrasonicprocess
AT lutiejun reductionofaerobicandlacticacidbacteriaindairydesludgeusinganintegratedcompressedco2andultrasonicprocess
AT bainsnarinder reductionofaerobicandlacticacidbacteriaindairydesludgeusinganintegratedcompressedco2andultrasonicprocess
AT leekegarya reductionofaerobicandlacticacidbacteriaindairydesludgeusinganintegratedcompressedco2andultrasonicprocess