Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO2 and ultrasonic process

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@article{68f0c288c60e4093bebe8cdc6209f589,
title = "Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO2 and ultrasonic process",
abstract = "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 CO2 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.",
keywords = "Desludge, Milk byproduct processing, Sonication, Pressure, Supercritical",
author = "Timothy Overton and Tiejun Lu and Narinder Bains and Gary Leeke",
year = "2015",
month = sep
doi = "10.1007/s13594-015-0241-6",
language = "English",
volume = "95",
pages = "733--745",
journal = "Dairy Science & Technology",
issn = "1958-5586",
publisher = "Springer",
number = "5",

}

RIS

TY - JOUR

T1 - Reduction of aerobic and lactic acid bacteria in dairy desludge using an integrated compressed CO2 and ultrasonic process

AU - Overton, Timothy

AU - Lu, Tiejun

AU - Bains, Narinder

AU - Leeke, Gary

PY - 2015/9

Y1 - 2015/9

N2 - 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 CO2 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.

AB - 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 CO2 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.

KW - Desludge

KW - Milk byproduct processing

KW - Sonication

KW - Pressure

KW - Supercritical

U2 - 10.1007/s13594-015-0241-6

DO - 10.1007/s13594-015-0241-6

M3 - Article

VL - 95

SP - 733

EP - 745

JO - Dairy Science & Technology

JF - Dairy Science & Technology

SN - 1958-5586

IS - 5

ER -