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Like many foods, milk and its derivatives provide a suitable environment for spoilage microorganisms. Therefore, pretreatment and temperature, time parameters must be selected to control the growth of microorganisms. Heat treatment and centrifugal sterilization are the traditional methods of reducing total number of bacteria in milk and dairy products, but these methods have their own advantages and disadvantages. Traditional techniques to remove bacteria in milk have  more steps and high cost,short life, environmental pollution,  inconvenient cleaning .

Membrane separation technology is used to eliminate bacteria in milk, which is based on the fact that the membrane has different material retention rates in various components of milk, including bacteria and spores.Bacteria can make the rejection rate of more than 99%, while casein transmittance can reach about 99%.

Membrane separation technology has a good membrane flux and sterilization effect, can completely remove bacteria in liquid milk, at the same time the flavor of milk has also been improved.

Membrane separation technology for cold sterilization is the method of fresh milk is  preheated to about 50 degrees and skim milk is got through milk cream separation machine .Then on the same day fresh skim milk makes filtration sterilization, combining with high-temperature instantaneous sterilization technology, to access to high quality dairy products.Such low-temperature sterilization retains a good flavor and nutrients, rich aroma.

Moreover, membrane cleaning is much easier to regenerate, so that membrane fouling can be controlled and a higher and more stable membrane flux can be maintained. The use of membrane separation technology for cold sterilization of milk, functional components can be retained during the re-separation activity, is an ideal method of sterilization of milk.