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

机译:使用集成的压缩CO2和超声工艺减少乳制品污泥中的好氧和乳酸菌

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摘要

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.
机译:当前的处理路线不适合于减少和稳定一些乳品加工流中的细菌含量,例如分离器和细菌浮渣污泥,这目前是乳品生产商面临的主要排放问题。在这项研究中,开发了一种处理污泥的新方法。高压超声(EPS)是一种新方法,结合了低频超声(20 kHz)和升高的CO2压力(50至100 bar)。针对分批和连续EPS工艺优化了工艺条件(压力,超声仪功率,处理时间),以将细菌性污泥中污泥中的好氧和乳酸菌的存活数量减少≥3个对数倍。污泥中存在的蛋白质也会发生凝结,导致固体(凝乳)和液体(乳清)级分分离。与高温短时(HTST)处理牛奶相比,拟议中的方法可将能耗降低10倍。

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