Milk Cleaning Process and Milk Clarifier Separators
The steps of cleaning the milk in dairies are given below.
Purpose and Importance
Milk may contain cell-derived substances such as some epithelial cells and leukocytes from the udder during milking. However, after milking, there is contamination of the milk with solid materials such as hay, straw, straw, hair, fertilizer residues, soil particles. may be the subject. In addition to spoiling the appearance of milk, these materials also mediate the contamination of microorganisms that cause microbial spoilage. Hence the need
1. Mixer 2. Manhole cover 3. Temperature display 4. The lowest level control electrode 5. Pneumatic level gauge 6. Anti-overflow electrode
During and after milking, such unwanted materials should be removed from the milk. For this purpose, different cleaning methods are used. Straining through cloth or wire strainers and/or line filters placed on the milk intake scale; are the methods used in clarification enterprises.
Cleaning with Filter
While the milk that comes to small businesses in cans is poured into the milk intake scale, it is filtered through cloth filters (such as cheesecloth) or wire strainers placed on the scale. is removed from the environment. In addition, if cheesecloth is used in the filtering process, the cloth should be cleaned and disinfected. A method commonly used in medium and large scale enterprises is to add metal strainers to the tank of the weighing scale during milk acceptance as an alternative to coarse straining. and installing metal line filters on plate cooler inlets. These filters are made of stainless steel and need to be cleaned and disinfected frequently. required. Wire strainer placed on the milk intake scale In addition, special milk filters can be used for this purpose. These consist of a boiler made of chrome-nickel alloy, a tightly woven plastic based strainer, milk inlet and outlet pipes.
Cleaning milk with Centrifugal Force (Clarification with milk clarifier separators )
Somatic cells, blood clots, leukocytes, some microorganisms, protein pellets rich in bacteria and other pollution factors that cannot be removed by rough cleaning are effectively purified by the clarification process. Mechanization of the process of purifying the milk from coarse particles by increasing the amount of milk is recommended in terms of ease of operation. For this purpose clarifier so-called mechanical separators are used.
Principle of the Method
The continuous separation of the solid, semi-solid or semi-liquid phases in the main phase (milk) by centrifugal force is called "clarification". The main principle of this method is that the particles with more density than milk are removed from the environment by the effect of centrifugal force. is removal. Elements with a diameter of 4-5 microns can be removed by cleaning with clarifiers.
1.Ventilation valve 2. Cover 3. Filter tank 4. Filter element 5. Plastic based bag 6. Drain cock 7. Milk inlet 8. Milk output
During the use of the clarifier, the separation speed must be well adjusted. Otherwise, the oil, which is the component with the lowest density of milk, may be removed from the environment. In order to prevent the separation of the fat, the milk is removed from the clarifier. It is recommended to spend it at a temperature below 10°C.
Structure of Milk Clarifiers
There are conical bowls arranged one above the other inside the body of clarifiers working with centrifugal force. The number of these bowls without holes can vary between 10 and 20 depending on the capacity. 1-3 mm thick on the dish surface and There are 8 bars (strip-pin) spaced evenly. Their number can vary between 6-12 depending on the diameter of the bowls. Thanks to these rods, when the bowls are placed on top of each other, a gap of 1-3 mm remains between the surfaces and this is called the channel. is given. Thus, it is possible to spread the milk in the form of a film between these channels. Some cream separators can also perform the cleaning process.
Clarification Process During clarification, milk enters through the inlet tube and spreads as a thin film into the channels between the bowls. With the direction of the sticks on the bowls and the centrifugal force, foreign particles with a higher density than milk are separated and accumulated at the bottom of the separator sludge cavity, while the milk separated from the dirt rises upwards and is taken out from the discharge pipe. The number of revolutions of the drum varies between 5000-6000 per minute and 10 to 50 m3 of milk can be cleaned per hour depending on the califier size.
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