The application scope of solid fermentation tank is closely related to its advantages

As one of the commonly used fermentation tanks, solid fermentation tank is widely used But many customers don't know much about the operation principle and specific application of the solid fermentation tank Today we will talk about the relevant knowledge of the solid fermentation tank Solid fermentation tanks are widely used in dairy fermentation, beer fermentation, wine fermentation, brewery wastewater treatment equipment, biogas fermentation equipment and other fields Solid fermentation refers to the fermentation process in which natural substrate is used as carbon source and energy source, or inert substrate is used as solid support, and the system is anhydrous or nearly anhydrous There are mainly shallow plate fermentation and thick layer ventilation fermentation The operation principle of solid fermentation tank is that the microorganism grows in the wet and water-insoluble substrate for fermentation, and there is no free water in the solid fermentation process With the addition of free water produced by the microorganism, the scale of solid fermentation extends to viscous fermentation and solid particle suspension fermentation It can be assumed that the growth environment of each cell may not be the same In order to further improve the cultivation efficiency, the method of increasing apparent volume was selected In the laboratory, test tube slant, culture dish, triangle bottle and Kirschner bottle are generally used for cultivation In most factories, curved plate, curtain and ventilated Quchi are used for cultivation, especially in the cultivation of mould, the solid cultivation method is still used at present Because it is cheap to choose agricultural and sideline products such as bran as the material, its particle appearance is large, loose and ventilative, and the material is easy to obtain in large quantities, so the brewing profession is widely used However, there are still many difficulties in large-scale surface cultivation skills In fermentation production, those that can be cultivated with liquid surface mostly choose liquid deep cultivation method instead The production process of solid fermentation is as follows: production strain - solid or liquid species - inoculation - solid fermentation tank - Fermentation - drying of fermentation material - grinding - compounding - testing - Packaging - finished product The advantages of the solid fermentation tank are as follows: (1) the culture medium is simple and has a wide range of sources, which is mostly cheap natural substrate or industrial waste; (2) the substrate has low water content, which can greatly reduce the volume of the bioreactor, does not need waste water treatment, and the environmental pollution is small; (3) the investment is small, and the energy consumption is relatively low; Generally, the fermentation process does not need strict aseptic operation, and the technical requirements are relatively low; the disadvantages of solid fermentation production are mainly that it is difficult to implement automation, high labor intensity and low production efficiency According to the solid fermentation equipment of the fermentation tank, it can be divided into two types: vertical double drive dry and wet mixing machine and multiple automatic stainless steel fermentation tank The solid fermentation tank adopts the internal circulation mode and uses the stirring paddle to disperse and break the bubbles It has high dissolved oxygen rate and good mixing effect The main body of the fermentation tank is provided with interlayer, heat preservation layer, heating, cooling and heat preservation functions The tank body and the upper and lower ellipsoidal heads are all processed by spinning R angle The inner wall of the tank is polished by mirror surface, which is sanitary and free of dead angle The fully closed design ensures that the materials are always mixed and fermented in a pollution-free state The equipment is equipped with air breathing hole, CIP cleaning nozzle, manhole, material inlet and outlet and other devices Practical application of solid fermentation tank the medium of solid fermentation tank is simple, such as grains, wheat bran, wheat grass, bulk grains or agricultural products, etc can be used, and the cost of fermentation material is more economic The pre substrate treatment is less than liquid fermentation, for example, simply adding water to make the substrate moist, or simply grinding the substrate to increase the touch area, without special machines and tools, the general family can carry out the process This kind of fermentation can be carried out in low skill areas because the water can reduce the pollution of miscellaneous bacteria For example, the red pigment produced by Monascus is ten times more than that produced by liquid fermentation, and the glucosidase produced by Aspergillus in solid fermentation is more heat-resistant than that produced by liquid fermentation Solid fermentation is suitable for medium with proper height, and can be carried out in a smaller reactor The output value per unit volume is higher than that of liquid The process of recovery and purification and waste disposal are generally simplified or simple, and the whole substrate is often used If it is used as feed additive, recovery and purification are not required, and there is no doubt about waste Solid fermentation can produce special flavor of food and improve nutritional value For example, Tianpei can be used as a substitute of meat, and its amino acids and fatty acids are easily digested and absorbed by human body Solid state fermentation means that the raw materials for brewing are solid Raw materials are divided into main materials and auxiliary materials The main materials are grain, and the auxiliary materials are rice bran, rice bran, bran, sorghum shell and crushed corn core The main materials and auxiliary materials are watered and mixed, and then mixed with distiller's yeast, or compacted, or loose, or sealed, or open to air, so as to regulate the temperature, humidity and air, and then regulate the propagation of microorganisms, the activity of enzymes secreted by microorganisms and a series of biochemical reactions This process is fermentation Through fermentation, starch in grain is first decomposed into sugar and then into alcohol, fat in grain is first decomposed into various fatty acids and then into fatty acid esters and organic acids, protein in grain is first decomposed into various amino acids and then into alcohols, aldehydes, ketones and nitriding compounds These ingredients together make up the wine When water is removed, alcohol accounts for 99% and others only account for 1% But if there is no such 1%, it is only alcohol rather than wine The liquor thus brewed is the liquor produced by solid-state fermentation of pure grain with traditional technology In recent years, with the continuous progress of science and technology, the fermentation industry, which is related to the national economy and people's livelihood, has made rapid development, and the fermentation tank has also been updated from the traditional to the modern direction In the future, the application of solid fermentation tank will be more and more extensive.