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Russian Plate and frame filter press application to remove bacterial count in white soy sauce
White soy sauce is commonly known as white soup soy sauce, white soy sauce, and in some areas, it is also called noodle oil or raw sweet oil. This product is mainly made of whole wheat flour or wheat flour, with a small number of soybeans added as the main raw material, large cakes or loose yellow koji, high-salt dilute state sun-dried fermentation, extracted or pressed soy sauce is light and bright in color, high in sugar content , full of sweetness, delicious taste, rich sauce, and unique flavor, it is very popular among consumers in this region.
Since white soy sauce is brewed using the traditional drying process, it is inevitable to bring different degrees of bacterial contamination during the production process. In some batches, the total number of bacterial colonies in raw soy sauce is as high as several million per milliliter.
In order to improve product quality, plate and frame filter press and filter aid were used to solve the problem of a high total number of bacteria in white soy sauce, and a satisfactory sterilization effect was obtained.
The basic structure of the plate and frame filter press is to press several filter plates and filter frames together to form several filter chambers to filter the slurry.
At present, there are many kinds of plate and frame filter presses in the market, which are generally divided into two categories: fully automatic and semi-automatic.
Cloth regeneration, air blowing, and other operations are all automatically controlled by the PLC, while more or all of the operations are performed manually by semi-automatic.
Plate and frame filter presses can also be classified according to the installation and configuration of the filter plates. There are two types: horizontal type with the plate frame perpendicular to the ground and vertical type with the plate frame parallel to the ground. The horizontal type is easier to operate and overhaul than the vertical type, and it is easier to develop to a large size. Now the maximum filtration area has reached more than 1000, while the vertical type only reaches 40. The commonly used model in China is the XMZ type.
The plate and frame filter press have the following advantages in the sterilization of white soy sauce.
Firstly, the plate and frame filter press and diatomite filter aid are used to sterilize and filter flour-made white soy sauce. The maximum average production capacity of the 30m2 plate and frame filter press is 1.2 L/s; the sterilizing filter aid HCS-01 diatomite is added 0.8-1.8%, the total number of bacteria in soy sauce after filtration is 6000-12000 cfu/mL, and the sterilization rate is over 99%.
Secondly, a plate and frame filter press was used to filter and sterilize. The main physical and chemical indicators of the soy sauce before and after filtration did not change significantly, and the soy sauce after filtration had good clarity. Bitter and sour, it maintains the pure flavor of raw sun-dried soy sauce. It can be directly filled or marketed after being graded and blended (without precipitation).
Finally, the plate and frame filter press is used to filter and sterilize at room temperature or below the pasteurization temperature. The process flow is simple. Compared with the conventional pasteurization process in the soy sauce production process, it saves coal consumption, reduces precipitation equipment, and shortens the process, which is conducive to energy saving and consumption reduction in the production process.
BMJ series (food grade) reinforced polypropylene plate and frame filter press has a simple structure, convenient operation, low failure rate, and can effectively ensure that the qualified rate of filtered products is stable at a controllable level.
